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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Gwyddion Data Processing Library Reference Manual: grains</title>
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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="refsynopsisdiv">
<a name="libgwyprocess-grains.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;libprocess/gwyprocess.h&gt;

<span class="returnvalue">void</span>                <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>
                                                        (<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>);
<span class="returnvalue">void</span>                <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>
                                                        (<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="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> locate_thresh</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> locate_dropsize</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> wshed_steps</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> wshed_dropsize</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> prefilter</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>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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>  (<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> col</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> row</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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> (<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> col</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> row</code></em>);
<span class="returnvalue">void</span>                <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>
                                                        (<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> size</code></em>);
<span class="returnvalue">void</span>                <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>
                                                        (<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>);
<span class="returnvalue">void</span>                <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>
                                                        (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *grain_field</code></em>);
<a class="link" href="libgwyprocess-gwyprocessenums.html#GwyComputationState" title="GwyComputationState"><span class="returnvalue">GwyComputationState</span></a> * <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>
                                                        (<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>);
<span class="returnvalue">void</span>                <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>
                                                        (<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyComputationState" title="GwyComputationState"><span class="type">GwyComputationState</span></a> *state</code></em>);
<span class="returnvalue">void</span>                <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>
                                                        (<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyComputationState" title="GwyComputationState"><span class="type">GwyComputationState</span></a> *state</code></em>);
<span class="returnvalue">void</span>                <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>   (<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>);
<span class="returnvalue">void</span>                <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>    (<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>);
<span class="returnvalue">void</span>                <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-add" title="gwy_data_field_grains_add ()">gwy_data_field_grains_add</a>           (<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>);
<span class="returnvalue">void</span>                <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-intersect" title="gwy_data_field_grains_intersect ()">gwy_data_field_grains_intersect</a>     (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                <a class="link" href="libgwyprocess-grains.html#gwy-data-field-number-grains" title="gwy_data_field_number_grains ()">gwy_data_field_number_grains</a>        (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> *              <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>
                                                        (<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>);
<a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="returnvalue">GwyDataLine</span></a> *       <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>
                                                        (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> *           <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>    (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> **          <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>
                                                        (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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> (<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> quantity</code></em>);
<a href="../libgwyddion/GwySIUnit.html"><span class="returnvalue">GwySIUnit</span></a> *         <a class="link" href="libgwyprocess-grains.html#gwy-grain-quantity-get-units" title="gwy_grain_quantity_get_units ()">gwy_grain_quantity_get_units</a>        (<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>);
<span class="returnvalue">void</span>                <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>     (<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>);
<span class="returnvalue">void</span>                <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>
                                                        (<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>);
<span class="returnvalue">void</span>                <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>  (<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>
<div class="refsect1">
<a name="libgwyprocess-grains.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="libgwyprocess-grains.details"></a><h2>Details</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="/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 curvature threshold.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data to be used for marking.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Data field to store the resulting mask to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>threshval</code></em> :</span></p></td>
<td>Relative curvature threshold, in percents.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></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="/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>
Performs watershed algorithm.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data to be used for marking.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Result of marking (mask).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locate_steps</code></em> :</span></p></td>
<td>Locating algorithm steps.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locate_thresh</code></em> :</span></p></td>
<td>Locating algorithm threshold.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locate_dropsize</code></em> :</span></p></td>
<td>Locating drop size.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>wshed_steps</code></em> :</span></p></td>
<td>Watershed steps.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>wshed_dropsize</code></em> :</span></p></td>
<td>Watershed drop size.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefilter</code></em> :</span></p></td>
<td>Use prefiltering.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Field of marked grains (mask).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Column inside a grain.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Row inside a grain.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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).</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Field of marked grains (mask).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Column inside a grain.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Row inside a grain.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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).</td>
</tr>
</tbody>
</table></div>
</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Field of marked grains (mask).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>Grain area threshold, in square pixels.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data to be used for marking</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Field of marked grains (mask)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>threshval</code></em> :</span></p></td>
<td>Relative height threshold, in percents.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Field of marked grains (mask).</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.30</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data to be used for marking.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Result of marking (mask).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locate_steps</code></em> :</span></p></td>
<td>Locating algorithm steps.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locate_thresh</code></em> :</span></p></td>
<td>Locating algorithm threshold.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locate_dropsize</code></em> :</span></p></td>
<td>Locating drop size.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>wshed_steps</code></em> :</span></p></td>
<td>Watershed steps.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>wshed_dropsize</code></em> :</span></p></td>
<td>Watershed drop size.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefilter</code></em> :</span></p></td>
<td>Use prefiltering.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A new watershed iterator.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>state</code></em> :</span></p></td>
<td>Watershed iterator.</td>
</tr></tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>state</code></em> :</span></p></td>
<td>Watershed iterator.</td>
</tr></tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data to be used for marking.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Data field to store the resulting mask to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>threshval</code></em> :</span></p></td>
<td>Relative height threshold, in percents.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data to be used for marking.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Data field to store the resulting mask to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>threshval</code></em> :</span></p></td>
<td>Relative slope threshold, in percents.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></div>
</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
<code class="literal">gwy_data_field_max_of_fields(grain_field, grain_field, add_field);</code>
and it will be probably removed someday.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>Field of marked grains (mask).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>add_field</code></em> :</span></p></td>
<td>Field of marked grains (mask) to be added.</td>
</tr>
</tbody>
</table></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
<code class="literal">gwy_data_field_min_of_fields(grain_field, grain_field, intersect_field);</code>
and it will be probably removed someday.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>field of marked grains (mask).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>intersect_field</code></em> :</span></p></td>
<td>Field of marked grains (mask).</td>
</tr>
</tbody>
</table></div>
</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mask_field</code></em> :</span></p></td>
<td>Data field containing positive values in grains, nonpositive
in free space.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grains</code></em> :</span></p></td>
<td>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, ...</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of last grain (note they are numbered from 1).</td>
</tr>
</tbody>
</table></div>
</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mask_field</code></em> :</span></p></td>
<td>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>).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ngrains</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grains</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bboxes</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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).</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</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>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data field used for marking.  For some quantities its values
are not used, but units and physical dimensions are always
taken from it.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grain_field</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>distribution</code></em> :</span></p></td>
<td>Data line to store grain distribution to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ngrains</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grains</code></em> :</span></p></td>
<td>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).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>quantity</code></em> :</span></p></td>
<td>The quantity to calculate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nstats</code></em> :</span></p></td>
<td>The number of samples to take on the distribution function.  If
nonpositive, a suitable resolution is determined automatically.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>values</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ngrains</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grains</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>quantity</code></em> :</span></p></td>
<td>The quantity to calculate.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>values</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>quantities</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nquantities</code></em> :</span></p></td>
<td>The number of requested different grain values.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ngrains</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>grains</code></em> :</span></p></td>
<td>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>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.22</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>quantity</code></em> :</span></p></td>
<td>A grain quantity.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.7</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>quantity</code></em> :</span></p></td>
<td>A grain quantity.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>siunitxy</code></em> :</span></p></td>
<td>Lateral SI unit of data.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>siunitz</code></em> :</span></p></td>
<td>Value SI unit of data.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>result</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.7</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>target_line</code></em> :</span></p></td>
<td>A data line to store the distribution to.  It will be
resampled to the requested width.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Upper-left column coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Upper-left row coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Area width (number of columns).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Area height (number of rows).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nstats</code></em> :</span></p></td>
<td>The number of samples to take on the distribution function.  If
nonpositive, a suitable resolution is determined automatically.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>target_line</code></em> :</span></p></td>
<td>A data line to store the distribution to.  It will be
resampled to the requested width.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Upper-left column coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Upper-left row coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Area width (number of columns).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Area height (number of rows).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min</code></em> :</span></p></td>
<td>Minimum threshold value.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max</code></em> :</span></p></td>
<td>Maximum threshold value.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>below</code></em> :</span></p></td>
<td>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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nstats</code></em> :</span></p></td>
<td>The number of samples to take on the distribution function.  If
nonpositive, a suitable resolution is determined automatically.</td>
</tr>
</tbody>
</table></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>
<p>
</p>
</div>
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