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<title>grains: Gwyddion Data Processing Library Reference Manual</title>
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<a href="#libgwyprocess-grains.description" class="shortcut">Description</a></span>
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<h2><span class="refentrytitle"><a name="libgwyprocess-grains.top_of_page"></a>grains</span></h2>
<p>grains — Grain detection and processing</p>
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<div class="refsect1">
<a name="libgwyprocess-grains.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-mark-curvature" title="gwy_data_field_grains_mark_curvature ()">gwy_data_field_grains_mark_curvature</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-mark-watershed" title="gwy_data_field_grains_mark_watershed ()">gwy_data_field_grains_mark_watershed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-remove-grain" title="gwy_data_field_grains_remove_grain ()">gwy_data_field_grains_remove_grain</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-extract-grain" title="gwy_data_field_grains_extract_grain ()">gwy_data_field_grains_extract_grain</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-remove-by-number" title="gwy_data_field_grains_remove_by_number ()">gwy_data_field_grains_remove_by_number</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-remove-by-size" title="gwy_data_field_grains_remove_by_size ()">gwy_data_field_grains_remove_by_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-remove-by-height" title="gwy_data_field_grains_remove_by_height ()">gwy_data_field_grains_remove_by_height</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-remove-touching-border" title="gwy_data_field_grains_remove_touching_border ()">gwy_data_field_grains_remove_touching_border</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libgwyprocess-gwyprocessenums.html#GwyComputationState" title="GwyComputationState"><span class="returnvalue">GwyComputationState</span></a> *
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-watershed-init" title="gwy_data_field_grains_watershed_init ()">gwy_data_field_grains_watershed_init</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-watershed-iteration" title="gwy_data_field_grains_watershed_iteration ()">gwy_data_field_grains_watershed_iteration</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-watershed-finalize" title="gwy_data_field_grains_watershed_finalize ()">gwy_data_field_grains_watershed_finalize</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-mark-height" title="gwy_data_field_grains_mark_height ()">gwy_data_field_grains_mark_height</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-mark-slope" title="gwy_data_field_grains_mark_slope ()">gwy_data_field_grains_mark_slope</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-otsu-threshold" title="gwy_data_field_otsu_threshold ()">gwy_data_field_otsu_threshold</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-add" title="gwy_data_field_grains_add ()">gwy_data_field_grains_add</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-intersect" title="gwy_data_field_grains_intersect ()">gwy_data_field_grains_intersect</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-invert" title="gwy_data_field_grains_invert ()">gwy_data_field_grains_invert</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-autocrop" title="gwy_data_field_grains_autocrop ()">gwy_data_field_grains_autocrop</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()">gwy_data_field_number_grains</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains-periodic" title="gwy_data_field_number_grains_periodic ()">gwy_data_field_number_grains_periodic</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> *
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-get-grain-bounding-boxes" title="gwy_data_field_get_grain_bounding_boxes ()">gwy_data_field_get_grain_bounding_boxes</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="returnvalue">GwyDataLine</span></a> *
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-get-distribution" title="gwy_data_field_grains_get_distribution ()">gwy_data_field_grains_get_distribution</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> *
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-get-values" title="gwy_data_field_grains_get_values ()">gwy_data_field_grains_get_values</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> **
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-get-quantities" title="gwy_data_field_grains_get_quantities ()">gwy_data_field_grains_get_quantities</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-grain-quantity-needs-same-units" title="gwy_grain_quantity_needs_same_units ()">gwy_grain_quantity_needs_same_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../libgwyddion/GwySIUnit.html"><span class="returnvalue">GwySIUnit</span></a> *
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-grain-quantity-get-units" title="gwy_grain_quantity_get_units ()">gwy_grain_quantity_get_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-area-grains-tgnd" title="gwy_data_field_area_grains_tgnd ()">gwy_data_field_area_grains_tgnd</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-area-grains-tgnd-range" title="gwy_data_field_area_grains_tgnd_range ()">gwy_data_field_area_grains_tgnd_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-splash-water" title="gwy_data_field_grains_splash_water ()">gwy_data_field_grains_splash_water</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grain-distance-transform" title="gwy_data_field_grain_distance_transform ()">gwy_data_field_grain_distance_transform</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grain-simple-dist-trans" title="gwy_data_field_grain_simple_dist_trans ()">gwy_data_field_grain_simple_dist_trans</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-shrink" title="gwy_data_field_grains_shrink ()">gwy_data_field_grains_shrink</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-grow" title="gwy_data_field_grains_grow ()">gwy_data_field_grains_grow</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-fill-voids" title="gwy_data_field_fill_voids ()">gwy_data_field_fill_voids</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-waterpour" title="gwy_data_field_waterpour ()">gwy_data_field_waterpour</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-mark-extrema" title="gwy_data_field_mark_extrema ()">gwy_data_field_mark_extrema</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libgwyprocess-grains.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libprocess/gwyprocess.h>
</pre>
</div>
<div class="refsect1">
<a name="libgwyprocess-grains.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="libgwyprocess-grains.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gwy-data-field-grains-mark-curvature"></a><h3>gwy_data_field_grains_mark_curvature ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_mark_curvature (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> threshval</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>);</pre>
<p>Marks data that are above/below curvature threshold.</p>
<div class="refsect3">
<a name="id-1.18.6.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data to be used for marking.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Data field to store the resulting mask to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>threshval</p></td>
<td class="parameter_description"><p>Relative curvature threshold, in percents.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, data below threshold are marked, otherwise data above
threshold are marked.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-mark-watershed"></a><h3>gwy_data_field_grains_mark_watershed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_mark_watershed (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> locate_steps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> locate_thresh</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> locate_dropsize</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> wshed_steps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> wshed_dropsize</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> prefilter</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>);</pre>
<p>Performs watershed algorithm.</p>
<div class="refsect3">
<a name="id-1.18.6.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data to be used for marking.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Result of marking (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>locate_steps</p></td>
<td class="parameter_description"><p>Locating algorithm steps.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>locate_thresh</p></td>
<td class="parameter_description"><p>Locating algorithm threshold.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>locate_dropsize</p></td>
<td class="parameter_description"><p>Locating drop size.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>wshed_steps</p></td>
<td class="parameter_description"><p>Watershed steps.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>wshed_dropsize</p></td>
<td class="parameter_description"><p>Watershed drop size.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>prefilter</p></td>
<td class="parameter_description"><p>Use prefiltering.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, valleys are marked, otherwise mountains are marked.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-remove-grain"></a><h3>gwy_data_field_grains_remove_grain ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_data_field_grains_remove_grain (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>);</pre>
<p>Removes one grain at given position.</p>
<div class="refsect3">
<a name="id-1.18.6.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>col</p></td>
<td class="parameter_description"><p>Column inside a grain.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>row</p></td>
<td class="parameter_description"><p>Row inside a grain.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.4.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if a grain was actually removed (i.e., (<em class="parameter"><code>col</code></em>
,<em class="parameter"><code>row</code></em>
) was
inside a grain).</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-extract-grain"></a><h3>gwy_data_field_grains_extract_grain ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_data_field_grains_extract_grain (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>);</pre>
<p>Removes all grains except that one at given position.</p>
<p>If there is no grain at (<em class="parameter"><code>col</code></em>
, <em class="parameter"><code>row</code></em>
), all grains are removed.</p>
<div class="refsect3">
<a name="id-1.18.6.5.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>col</p></td>
<td class="parameter_description"><p>Column inside a grain.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>row</p></td>
<td class="parameter_description"><p>Row inside a grain.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.5.7"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if a grain remained (i.e., (<em class="parameter"><code>col</code></em>
,<em class="parameter"><code>row</code></em>
) was inside a grain).</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-remove-by-number"></a><h3>gwy_data_field_grains_remove_by_number ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_remove_by_number
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> number</code></em>);</pre>
<p>Removes grain identified by <em class="parameter"><code>number</code></em>
.</p>
<div class="refsect3">
<a name="id-1.18.6.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>number</p></td>
<td class="parameter_description"><p>Grain number was filled by <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-35.html#api-index-2.35">2.35</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-remove-by-size"></a><h3>gwy_data_field_grains_remove_by_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_remove_by_size (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> size</code></em>);</pre>
<p>Removes all grains below specified area.</p>
<div class="refsect3">
<a name="id-1.18.6.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>Grain area threshold, in square pixels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-remove-by-height"></a><h3>gwy_data_field_grains_remove_by_height ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_remove_by_height
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> threshval</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>);</pre>
<p>Removes grains that are higher/lower than given threshold value.</p>
<div class="refsect3">
<a name="id-1.18.6.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data to be used for marking</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>threshval</p></td>
<td class="parameter_description"><p>Relative height threshold, in percents.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, grains below threshold are removed, otherwise grains above
threshold are removed.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-remove-touching-border"></a><h3>gwy_data_field_grains_remove_touching_border ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_remove_touching_border
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>);</pre>
<p>Removes all grains that touch field borders.</p>
<div class="refsect3">
<a name="id-1.18.6.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-30.html#api-index-2.30">2.30</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-watershed-init"></a><h3>gwy_data_field_grains_watershed_init ()</h3>
<pre class="programlisting"><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyComputationState" title="GwyComputationState"><span class="returnvalue">GwyComputationState</span></a> *
gwy_data_field_grains_watershed_init (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> locate_steps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> locate_thresh</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> locate_dropsize</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> wshed_steps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> wshed_dropsize</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> prefilter</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>);</pre>
<p>Initializes the watershed algorithm.</p>
<p>This iterator reports its state as <a class="link" href="libgwyprocess-gwyprocessenums.html#GwyWatershedStateType" title="enum GwyWatershedStateType"><span class="type">GwyWatershedStateType</span></a>.</p>
<div class="refsect3">
<a name="id-1.18.6.10.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data to be used for marking.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Result of marking (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>locate_steps</p></td>
<td class="parameter_description"><p>Locating algorithm steps.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>locate_thresh</p></td>
<td class="parameter_description"><p>Locating algorithm threshold.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>locate_dropsize</p></td>
<td class="parameter_description"><p>Locating drop size.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>wshed_steps</p></td>
<td class="parameter_description"><p>Watershed steps.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>wshed_dropsize</p></td>
<td class="parameter_description"><p>Watershed drop size.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>prefilter</p></td>
<td class="parameter_description"><p>Use prefiltering.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, valleys are marked, otherwise mountains are marked.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.10.7"></a><h4>Returns</h4>
<p> A new watershed iterator.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-watershed-iteration"></a><h3>gwy_data_field_grains_watershed_iteration ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_watershed_iteration
(<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyComputationState" title="GwyComputationState"><span class="type">GwyComputationState</span></a> *state</code></em>);</pre>
<p>Performs one iteration of the watershed algorithm.</p>
<p>Fields <em class="parameter"><code>state</code></em>
and progress <em class="parameter"><code>fraction</code></em>
of watershed state are updated
(fraction is calculated for each phase individually). Once <em class="parameter"><code>state</code></em>
becomes <a class="link" href="libgwyprocess-gwyprocessenums.html#GWY-WATERSHED-STATE-FINISHED:CAPS"><code class="literal">GWY_WATERSHED_STATE_FINISHED</code></a>, the calculation is finised.</p>
<p>A watershed iterator can be created with
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-watershed-init" title="gwy_data_field_grains_watershed_init ()"><code class="function">gwy_data_field_grains_watershed_init()</code></a>. When iteration ends, either
by finishing or being aborted, <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-watershed-finalize" title="gwy_data_field_grains_watershed_finalize ()"><code class="function">gwy_data_field_grains_watershed_finalize()</code></a>
must be called to release allocated resources.</p>
<div class="refsect3">
<a name="id-1.18.6.11.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>Watershed iterator.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-watershed-finalize"></a><h3>gwy_data_field_grains_watershed_finalize ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_watershed_finalize
(<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyComputationState" title="GwyComputationState"><span class="type">GwyComputationState</span></a> *state</code></em>);</pre>
<p>Destroys a watershed iterator, freeing all resources.</p>
<div class="refsect3">
<a name="id-1.18.6.12.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>Watershed iterator.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-mark-height"></a><h3>gwy_data_field_grains_mark_height ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_mark_height (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> threshval</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>);</pre>
<p>Marks data that are above/below height threshold.</p>
<div class="refsect3">
<a name="id-1.18.6.13.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data to be used for marking.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Data field to store the resulting mask to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>threshval</p></td>
<td class="parameter_description"><p>Relative height threshold, in percents.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, data below threshold are marked, otherwise data above
threshold are marked.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-mark-slope"></a><h3>gwy_data_field_grains_mark_slope ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_mark_slope (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> threshval</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>);</pre>
<p>Marks data that are above/below slope threshold.</p>
<div class="refsect3">
<a name="id-1.18.6.14.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data to be used for marking.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Data field to store the resulting mask to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>threshval</p></td>
<td class="parameter_description"><p>Relative slope threshold, in percents.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, data below threshold are marked, otherwise data above
threshold are marked.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-otsu-threshold"></a><h3>gwy_data_field_otsu_threshold ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>
gwy_data_field_otsu_threshold (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>);</pre>
<p>Finds Otsu's height threshold for a data field.</p>
<p>The Otsu's threshold is optimal in the sense that it minimises the
inter-class variances of two classes of pixels: above and below theshold.</p>
<div class="refsect3">
<a name="id-1.18.6.15.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-37.html#api-index-2.37">2.37</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-add"></a><h3>gwy_data_field_grains_add ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_add (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *add_field</code></em>);</pre>
<p>Adds <em class="parameter"><code>add_field</code></em>
grains to <em class="parameter"><code>grain_field</code></em>
.</p>
<p>Note: This function is equivalent to</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="libgwyprocess-arithmetic.html#gwy-data-field-max-of-fields">gwy_data_field_max_of_fields</a></span><span class="symbol">(</span><span class="normal">grain_field</span><span class="symbol">,</span><span class="normal"> grain_field</span><span class="symbol">,</span><span class="normal"> add_field</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<div class="refsect3">
<a name="id-1.18.6.16.8"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>add_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask) to be added.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-intersect"></a><h3>gwy_data_field_grains_intersect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_intersect (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *intersect_field</code></em>);</pre>
<p>Performs intersection betweet two grain fields,
result is stored in <em class="parameter"><code>grain_field</code></em>
.</p>
<p>Note: This function is equivalent to</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="libgwyprocess-arithmetic.html#gwy-data-field-min-of-fields">gwy_data_field_min_of_fields</a></span><span class="symbol">(</span><span class="normal">grain_field</span><span class="symbol">,</span><span class="normal"> grain_field</span><span class="symbol">,</span><span class="normal"> intersect_field</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<div class="refsect3">
<a name="id-1.18.6.17.8"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>intersect_field</p></td>
<td class="parameter_description"><p>Field of marked grains (mask).</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-invert"></a><h3>gwy_data_field_grains_invert ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_invert (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>);</pre>
<p>Inverts a data field representing a mask.</p>
<p>All non-positive values are transformed to 1.0. All positive values are
transformed to 0.0.</p>
<div class="refsect3">
<a name="id-1.18.6.18.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Data field (mask) of marked grains.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-43.html#api-index-2.43">2.43</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-autocrop"></a><h3>gwy_data_field_grains_autocrop ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_data_field_grains_autocrop (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *mask_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> symmetrically</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *left</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *right</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *up</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *down</code></em>);</pre>
<p>Removes empty border rows and columns from a data field representing a mask.</p>
<p>If there are border rows and columns filled completely with non-positive
values the size of the data field is reduced, removing these rows. The
parameter <em class="parameter"><code>symmetrically</code></em>
controls whether the size reduction is maximum
possible or symmetrical.</p>
<p>When there is no positive value in the field the field size is reduced to
the smallest possible. This means 1x1 for <em class="parameter"><code>symmetrical</code></em>
being <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> and
even original dimensions to 2 for <em class="parameter"><code>symmetrical</code></em>
being <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>.</p>
<div class="refsect3">
<a name="id-1.18.6.19.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>mask_field</p></td>
<td class="parameter_description"><p>Data field representing a mask.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>symmetrically</p></td>
<td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to remove borders symmetrically, i.e the same number
of pixels from left and right, and also top and bottom.
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to remove as many empty rows and columns as possible.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>left</p></td>
<td class="parameter_description"><p>Location to store how many column were removed from the left, or
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>right</p></td>
<td class="parameter_description"><p>Location to store how many column were removed from the right, or
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>up</p></td>
<td class="parameter_description"><p>Location to store how many row were removed from the top, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>down</p></td>
<td class="parameter_description"><p>Location to store how many row were removed from the bottom, or
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.19.8"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the field size was reduced at all. Detailed information
about the reduction can be obtained from <em class="parameter"><code>left</code></em>
, <em class="parameter"><code>right</code></em>
, <em class="parameter"><code>up</code></em>
and
<em class="parameter"><code>down</code></em>
.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-43.html#api-index-2.43">2.43</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-number-grains"></a><h3>gwy_data_field_number_grains ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gwy_data_field_number_grains (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *mask_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *grains</code></em>);</pre>
<p>Numbers grains in a mask data field.</p>
<div class="refsect3">
<a name="id-1.18.6.20.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>mask_field</p></td>
<td class="parameter_description"><p>Data field containing positive values in grains, nonpositive
in free space.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grains</p></td>
<td class="parameter_description"><p>Zero-filled array of integers of equal size to <em class="parameter"><code>mask_field</code></em>
to put
grain numbers to. Empty space will be left 0, pixels inside a
grain will be set to grain number. Grains are numbered
sequentially 1, 2, 3, ...</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.20.6"></a><h4>Returns</h4>
<p> The number of last grain (note they are numbered from 1).</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-number-grains-periodic"></a><h3>gwy_data_field_number_grains_periodic ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gwy_data_field_number_grains_periodic (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *mask_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *grains</code></em>);</pre>
<p>Numbers grains in a periodic mask data field.</p>
<p>This function differs from <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a> by the assumption
of periodicity, i.e. grains can touch across the opposite field edges.</p>
<div class="refsect3">
<a name="id-1.18.6.21.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>mask_field</p></td>
<td class="parameter_description"><p>Data field containing positive values in grains, nonpositive
in free space.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grains</p></td>
<td class="parameter_description"><p>Zero-filled array of integers of equal size to <em class="parameter"><code>mask_field</code></em>
to put
grain numbers to. Empty space will be left 0, pixels inside a
grain will be set to grain number. Grains are numbered
sequentially 1, 2, 3, ...</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.21.7"></a><h4>Returns</h4>
<p> The number of last grain (note they are numbered from 1).</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-38.html#api-index-2.38">2.38</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-get-grain-bounding-boxes"></a><h3>gwy_data_field_get_grain_bounding_boxes ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> *
gwy_data_field_get_grain_bounding_boxes
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *mask_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> ngrains</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *grains</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *bboxes</code></em>);</pre>
<p>Find bounding boxes of all grains.</p>
<div class="refsect3">
<a name="id-1.18.6.22.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>mask_field</p></td>
<td class="parameter_description"><p>Data field containing positive values in grains, nonpositive
in free space. However its contents is ignored as all
grain information is taken from <em class="parameter"><code>grains</code></em>
(its dimensions
determine the dimensions of <em class="parameter"><code>grains</code></em>
).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ngrains</p></td>
<td class="parameter_description"><p>The number of grains as returned by
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grains</p></td>
<td class="parameter_description"><p>Grain numbers filled with <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>bboxes</p></td>
<td class="parameter_description"><p>Array of size at least 4*(<em class="parameter"><code>ngrains</code></em>
+1) to fill with grain bounding
boxes (as usual zero does not correspond to any grain, grains
start from 1). The bounding boxes are stored as quadruples of
indices: (xmin, ymin, width, height). It can be <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to allocate
a new array.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.22.6"></a><h4>Returns</h4>
<p> Either <code class="literal">bboxes</code> (if it was not <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>), or a newly allocated array
of size 4(<em class="parameter"><code>ngrains</code></em>
+ 1).</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-3.html#api-index-2.3">2.3</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-get-distribution"></a><h3>gwy_data_field_grains_get_distribution ()</h3>
<pre class="programlisting"><a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="returnvalue">GwyDataLine</span></a> *
gwy_data_field_grains_get_distribution
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="type">GwyDataLine</span></a> *distribution</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> ngrains</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *grains</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> quantity</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> nstats</code></em>);</pre>
<p>Computes distribution of requested grain characteristics.</p>
<p>Puts number of grains vs. grain value data into <em class="parameter"><code>distribution</code></em>
, units, scales
and offsets of <em class="parameter"><code>distribution</code></em>
are updated accordingly.</p>
<p>Note the <em class="parameter"><code>i</code></em>
-th bin is [<em class="parameter"><code>i</code></em>
*<em class="parameter"><code>dx</code></em>
+<em class="parameter"><code>off</code></em>
,(<em class="parameter"><code>i</code></em>
+1)*<em class="parameter"><code>dx</code></em>
+<em class="parameter"><code>off</code></em>
] so the central value
you probably want to use for plotting is (<em class="parameter"><code>i</code></em>
+0.5)*<em class="parameter"><code>dx</code></em>
+<em class="parameter"><code>off</code></em>
(where <em class="parameter"><code>dx</code></em>
is
the <em class="parameter"><code>distribution</code></em>
data line pixel size, <em class="parameter"><code>off</code></em>
is its offset).</p>
<div class="refsect3">
<a name="id-1.18.6.23.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data field used for marking. For some quantities its values
are not used, but units and physical dimensions are always
taken from it.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grain_field</p></td>
<td class="parameter_description"><p>Data field (mask) of marked grains. Note if you pass
non-<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> <em class="parameter"><code>grains</code></em>
all grain information is taken from it and
<em class="parameter"><code>grain_field</code></em>
can be even <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> then.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>distribution</p></td>
<td class="parameter_description"><p>Data line to store grain distribution to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grains</p></td>
<td class="parameter_description"><p>Grain numbers filled with <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a> if you
have it, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> (the function then finds grain numbers itself
which is not efficient for repeated use on the same grain field).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ngrains</p></td>
<td class="parameter_description"><p>The number of grains as returned by
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>. Ignored in <em class="parameter"><code>grains</code></em>
is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>quantity</p></td>
<td class="parameter_description"><p>The quantity to calculate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nstats</p></td>
<td class="parameter_description"><p>The number of samples to take on the distribution function. If
nonpositive, a suitable resolution is determined automatically.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.23.8"></a><h4>Returns</h4>
<p> A data line with the distribution: <em class="parameter"><code>distribution</code></em>
itself if it was
not <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, otherwise a newly created <a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="type">GwyDataLine</span></a> caller must
destroy. If there are no grains, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> is returned and
<em class="parameter"><code>distribution</code></em>
is not changed.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-get-values"></a><h3>gwy_data_field_grains_get_values ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> *
gwy_data_field_grains_get_values (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *values</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> ngrains</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *grains</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> quantity</code></em>);</pre>
<p>Calculates characteristics of grains.</p>
<p>This is a bit low-level function, see also
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-get-distribution" title="gwy_data_field_grains_get_distribution ()"><code class="function">gwy_data_field_grains_get_distribution()</code></a>.</p>
<p>The array <em class="parameter"><code>values</code></em>
will be filled with the requested grain value for each
individual grain (0th item of <em class="parameter"><code>values</code></em>
which does not correspond to any grain
will be overwritten with an arbitrary value and should be ignored).</p>
<p>The grain numbers serve as indices in <em class="parameter"><code>values</code></em>
. Therefore as long as the
same <em class="parameter"><code>grains</code></em>
is used, the same position in <em class="parameter"><code>values</code></em>
corresponds to the same
particular grain. This enables one for instance to calculate grain sizes
and grain heights and then correlate them.</p>
<div class="refsect3">
<a name="id-1.18.6.24.8"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data field used for marking. For some quantities its values
are not used, but its dimensions determine the dimensions of
<em class="parameter"><code>grains</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>values</p></td>
<td class="parameter_description"><p>Array of size <em class="parameter"><code>ngrains</code></em>
+1 to put grain values to. It can be
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to allocate and return a new array.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grains</p></td>
<td class="parameter_description"><p>Grain numbers filled with <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ngrains</p></td>
<td class="parameter_description"><p>The number of grains as returned by
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>quantity</p></td>
<td class="parameter_description"><p>The quantity to calculate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.24.9"></a><h4>Returns</h4>
<p> <em class="parameter"><code>values</code></em>
itself if it was not <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, otherwise a newly allocated
array that caller has to free.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-get-quantities"></a><h3>gwy_data_field_grains_get_quantities ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> **
gwy_data_field_grains_get_quantities (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> **values</code></em>,
<em class="parameter"><code>const <a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> *quantities</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> nquantities</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> ngrains</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *grains</code></em>);</pre>
<p>Calculates multiple characteristics of grains simultaneously.</p>
<p>See <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-get-values" title="gwy_data_field_grains_get_values ()"><code class="function">gwy_data_field_grains_get_values()</code></a> for some discussion. This function
is more efficient if several grain quantities need to be calculated since
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-get-values" title="gwy_data_field_grains_get_values ()"><code class="function">gwy_data_field_grains_get_values()</code></a> can do lot of repeated work in such case.</p>
<div class="refsect3">
<a name="id-1.18.6.25.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>Data field used for marking. For some quantities its values
are not used, but its dimensions determine the dimensions of
<em class="parameter"><code>grains</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>values</p></td>
<td class="parameter_description"><p>Array of <em class="parameter"><code>nquantities</code></em>
pointers to blocks of length <em class="parameter"><code>ngrains</code></em>
+1 to
put the calculated grain values to. Each block corresponds to one
requested quantity. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> can be passed to allocate and return a
new array.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>quantities</p></td>
<td class="parameter_description"><p>Array of <em class="parameter"><code>nquantities</code></em>
items that specify the requested
<a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> to put to corresponding items in <em class="parameter"><code>values</code></em>
.
Quantities can repeat.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nquantities</p></td>
<td class="parameter_description"><p>The number of requested different grain values.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grains</p></td>
<td class="parameter_description"><p>Grain numbers filled with <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ngrains</p></td>
<td class="parameter_description"><p>The number of grains as returned by
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.25.7"></a><h4>Returns</h4>
<p> <em class="parameter"><code>values</code></em>
itself if it was not <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, otherwise a newly allocated
array that caller has to free with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a>, including the
contained arrays.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-quantity-needs-same-units"></a><h3>gwy_grain_quantity_needs_same_units ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_grain_quantity_needs_same_units (<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> quantity</code></em>);</pre>
<p>Tests whether a grain quantity is defined only when lateral and value
units match.</p>
<div class="refsect3">
<a name="id-1.18.6.26.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>quantity</p></td>
<td class="parameter_description"><p>A grain quantity.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.26.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>quantity</code></em>
is meaningless when lateral and value units
differ, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if it is always defined.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-7.html#api-index-2.7">2.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-quantity-get-units"></a><h3>gwy_grain_quantity_get_units ()</h3>
<pre class="programlisting"><a href="../libgwyddion/GwySIUnit.html"><span class="returnvalue">GwySIUnit</span></a> *
gwy_grain_quantity_get_units (<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> quantity</code></em>,
<em class="parameter"><code><a href="../libgwyddion/GwySIUnit.html"><span class="type">GwySIUnit</span></a> *siunitxy</code></em>,
<em class="parameter"><code><a href="../libgwyddion/GwySIUnit.html"><span class="type">GwySIUnit</span></a> *siunitz</code></em>,
<em class="parameter"><code><a href="../libgwyddion/GwySIUnit.html"><span class="type">GwySIUnit</span></a> *result</code></em>);</pre>
<p>Calculates the units of a grain quantity.</p>
<div class="refsect3">
<a name="id-1.18.6.27.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>quantity</p></td>
<td class="parameter_description"><p>A grain quantity.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>siunitxy</p></td>
<td class="parameter_description"><p>Lateral SI unit of data.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>siunitz</p></td>
<td class="parameter_description"><p>Value SI unit of data.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>result</p></td>
<td class="parameter_description"><p>An SI unit to set to the units of <em class="parameter"><code>quantity</code></em>
.
It can be <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, a new SI unit is created then and returned.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.27.6"></a><h4>Returns</h4>
<p> When <em class="parameter"><code>result</code></em>
is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, a newly creates SI unit that has to be
dereferenced when no longer used later. Otherwise <em class="parameter"><code>result</code></em>
itself
is simply returned, its reference count is NOT increased.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-7.html#api-index-2.7">2.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-area-grains-tgnd"></a><h3>gwy_data_field_area_grains_tgnd ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_area_grains_tgnd (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="type">GwyDataLine</span></a> *target_line</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> nstats</code></em>);</pre>
<p>Calculates threshold grain number distribution.</p>
<p>This function is a simple <a class="link" href="libgwyprocess-grains.html#gwy-data-field-area-grains-tgnd-range" title="gwy_data_field_area_grains_tgnd_range ()"><code class="function">gwy_data_field_area_grains_tgnd_range()</code></a> that
calculates the distribution in the full range.</p>
<div class="refsect3">
<a name="id-1.18.6.28.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>target_line</p></td>
<td class="parameter_description"><p>A data line to store the distribution to. It will be
resampled to the requested width.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>col</p></td>
<td class="parameter_description"><p>Upper-left column coordinate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>row</p></td>
<td class="parameter_description"><p>Upper-left row coordinate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>Area width (number of columns).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>Area height (number of rows).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, valleys are marked, otherwise mountains are marked.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nstats</p></td>
<td class="parameter_description"><p>The number of samples to take on the distribution function. If
nonpositive, a suitable resolution is determined automatically.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-area-grains-tgnd-range"></a><h3>gwy_data_field_area_grains_tgnd_range ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_area_grains_tgnd_range (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="type">GwyDataLine</span></a> *target_line</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> min</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> max</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> below</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> nstats</code></em>);</pre>
<p>Calculates threshold grain number distribution in given height range.</p>
<p>This is the number of grains for each of <em class="parameter"><code>nstats</code></em>
equidistant height
threshold levels. For large <em class="parameter"><code>nstats</code></em>
this function is much faster than the
equivalent number of <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-mark-height" title="gwy_data_field_grains_mark_height ()"><code class="function">gwy_data_field_grains_mark_height()</code></a> calls.</p>
<div class="refsect3">
<a name="id-1.18.6.29.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>target_line</p></td>
<td class="parameter_description"><p>A data line to store the distribution to. It will be
resampled to the requested width.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>col</p></td>
<td class="parameter_description"><p>Upper-left column coordinate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>row</p></td>
<td class="parameter_description"><p>Upper-left row coordinate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>Area width (number of columns).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>Area height (number of rows).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min</p></td>
<td class="parameter_description"><p>Minimum threshold value.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>max</p></td>
<td class="parameter_description"><p>Maximum threshold value.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>below</p></td>
<td class="parameter_description"><p>If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, valleys are marked, otherwise mountains are marked.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nstats</p></td>
<td class="parameter_description"><p>The number of samples to take on the distribution function. If
nonpositive, a suitable resolution is determined automatically.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-splash-water"></a><h3>gwy_data_field_grains_splash_water ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_splash_water (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *minima</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> locate_steps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> locate_dropsize</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grain-distance-transform"></a><h3>gwy_data_field_grain_distance_transform ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grain_distance_transform
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>);</pre>
<p>Performs Euclidean distance transform of a data field with grains.</p>
<p>Each non-zero value will be replaced with Euclidean distance to the grain
boundary, measured in pixels.</p>
<p>See also <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grain-simple-dist-trans" title="gwy_data_field_grain_simple_dist_trans ()"><code class="function">gwy_data_field_grain_simple_dist_trans()</code></a> for simple distance
transforms such as city-block or chessboard.</p>
<div class="refsect3">
<a name="id-1.18.6.31.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field with zeroes in empty space and nonzeroes in
grains.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-36.html#api-index-2.36">2.36</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grain-simple-dist-trans"></a><h3>gwy_data_field_grain_simple_dist_trans ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grain_simple_dist_trans
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyDistanceTransformType" title="enum GwyDistanceTransformType"><span class="type">GwyDistanceTransformType</span></a> dtype</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> from_border</code></em>);</pre>
<p>Performs a distance transform of a data field with grains.</p>
<p>Each non-zero value will be replaced with a distance to the grain boundary,
measured in pixels.</p>
<p>Note this function can calculate the Euclidean distance transform only since
2.43. Use <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grain-distance-transform" title="gwy_data_field_grain_distance_transform ()"><code class="function">gwy_data_field_grain_distance_transform()</code></a> for the EDT if you need
compatibility with older versions.</p>
<div class="refsect3">
<a name="id-1.18.6.32.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field with zeroes in empty space and nonzeroes in
grains.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>dtype</p></td>
<td class="parameter_description"><p>Type of simple distance to use.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>from_border</p></td>
<td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to consider image edges to be grain boundaries.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-41.html#api-index-2.41">2.41</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-shrink"></a><h3>gwy_data_field_grains_shrink ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_shrink (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> amount</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyDistanceTransformType" title="enum GwyDistanceTransformType"><span class="type">GwyDistanceTransformType</span></a> dtype</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> from_border</code></em>);</pre>
<p>Erodes a data field containing mask by specified amount using a distance
measure.</p>
<p>Non-zero pixels in <em class="parameter"><code>data_field</code></em>
will be replaced with zeroes if they are not
farther than <em class="parameter"><code>amount</code></em>
from the grain boundary as defined by <em class="parameter"><code>dtype</code></em>
.</p>
<div class="refsect3">
<a name="id-1.18.6.33.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field with zeroes in empty space and nonzeroes in
grains.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>amount</p></td>
<td class="parameter_description"><p>How much the grains should be reduced, in pixels. It is inclusive,
i.e. pixels that are <em class="parameter"><code>amount</code></em>
far from the border will be removed.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>dtype</p></td>
<td class="parameter_description"><p>Type of simple distance to use.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>from_border</p></td>
<td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to consider image edges to be grain boundaries.
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to reduce grains touching field boundaries only along
the boundaries.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-43.html#api-index-2.43">2.43</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-grains-grow"></a><h3>gwy_data_field_grains_grow ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_grains_grow (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> amount</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyDistanceTransformType" title="enum GwyDistanceTransformType"><span class="type">GwyDistanceTransformType</span></a> dtype</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> prevent_merging</code></em>);</pre>
<p>Dilates a data field containing mask by specified amount using a distance
measure.</p>
<p>Non-positive pixels in <em class="parameter"><code>data_field</code></em>
will be replaced with ones if they are
not farther than <em class="parameter"><code>amount</code></em>
from the grain boundary as defined by <em class="parameter"><code>dtype</code></em>
.</p>
<div class="refsect3">
<a name="id-1.18.6.34.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field with zeroes in empty space and nonzeroes in
grains.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>amount</p></td>
<td class="parameter_description"><p>How much the grains should be expanded, in pixels. It is
inclusive, i.e. exterior pixels that are <em class="parameter"><code>amount</code></em>
far from the
border will be filled.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>dtype</p></td>
<td class="parameter_description"><p>Type of simple distance to use.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>prevent_merging</p></td>
<td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to prevent grain merging, i.e. the growth stops
where two grains would merge. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to simply expand the
grains, without regard to grain connectivity.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-43.html#api-index-2.43">2.43</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-fill-voids"></a><h3>gwy_data_field_fill_voids ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_data_field_fill_voids (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> nonsimple</code></em>);</pre>
<p>Fills voids in grains in a data field representing a mask.</p>
<p>Voids in grains are zero pixels in <em class="parameter"><code>data_field</code></em>
from which no path exists
through other zero pixels to the field boundary. The paths are considered
in 8-connectivity because grains themselves are considered in
4-connectivity.</p>
<div class="refsect3">
<a name="id-1.18.6.35.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field with zeroes in empty space and nonzeroes in
grains.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nonsimple</p></td>
<td class="parameter_description"><p>Pass <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to fill also voids that are not simple-connected
(e.g. ring-like). This can result in grain merging if a small
grain is contained within a void. Pass <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to fill only
simple-connected grains.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.35.7"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if any voids were filled at all, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if no change was
made.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-37.html#api-index-2.37">2.37</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-waterpour"></a><h3>gwy_data_field_waterpour ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gwy_data_field_waterpour (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *result</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *grains</code></em>);</pre>
<p>Performs the classical Vincent watershed segmentation of a data field.</p>
<p>The segmentation always results in the entire field being masked with the
exception of thin (8-connectivity) lines separating the segments (grains).</p>
<p>Compared to <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-mark-watershed" title="gwy_data_field_grains_mark_watershed ()"><code class="function">gwy_data_field_grains_mark_watershed()</code></a>, this algorithm is very
fast. However, when used alone, it typically results in a serious
oversegmentation as each local minimum gives raise to a grain. Furthermore,
the full segmentation means that also pixels which would be considered
outside any grain in the topographical sense will be assigned to some
catchment basin. Therefore, pre- or postprocessing is usually necessary,
using the gradient image or a more sophisticated method.</p>
<p>The function does not assign pixels with value <code class="literal">HUGE_VAL</code> or larger to any
segment. This can be used to pre-mark certain areas explicitly as
boundaries.</p>
<p>Since the algorithm numbers the grains as a side effect, you can pass a
<em class="parameter"><code>grains</code></em>
array and get the grain numbers immediatelly, avoiding the
relatively (although not drastically) expensive
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a> call.</p>
<div class="refsect3">
<a name="id-1.18.6.36.9"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field to segmentate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>result</p></td>
<td class="parameter_description"><p>Data field that will be filled with the resulting mask. It will be
resized to the dimensions of <em class="parameter"><code>data_field</code></em>
and its properties set
accordingly.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>grains</p></td>
<td class="parameter_description"><p>Optionally, an array with the same number of items as <em class="parameter"><code>data_field</code></em>
.
If non-<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, it will be filled with grain numbers in the same
manner as <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a>. Pass <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.18.6.36.10"></a><h4>Returns</h4>
<p> The number of segments (grains) in the result, excluding the
separators, i.e. the same convention as in
<a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()"><code class="function">gwy_data_field_number_grains()</code></a> is used.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-37.html#api-index-2.37">2.37</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-mark-extrema"></a><h3>gwy_data_field_mark_extrema ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_mark_extrema (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *dfield</code></em>,
<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *extrema</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> maxima</code></em>);</pre>
</div>
</div>
<div class="refsect1">
<a name="libgwyprocess-grains.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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