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<h2><span class="refentrytitle"><a name="libgwyprocess-interpolation.top_of_page"></a>interpolation</span></h2>
<p>interpolation — General interpolation functions</p>
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<a name="libgwyprocess-interpolation.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libprocess/gwyprocess.h>
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-get-dval" title="gwy_interpolation_get_dval ()">gwy_interpolation_get_dval</a> (<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> x</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> x1_</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> y1_</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> x2_</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> y2_</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-get-dval-of-equidists" title="gwy_interpolation_get_dval_of_equidists ()">gwy_interpolation_get_dval_of_equidists</a>
(<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> x</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> *data</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-get-support-size" title="gwy_interpolation_get_support_size ()">gwy_interpolation_get_support_size</a> (<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</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-interpolation.html#gwy-interpolation-has-interpolating-basis" title="gwy_interpolation_has_interpolating_basis ()">gwy_interpolation_has_interpolating_basis</a>
(<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-interpolate-1d" title="gwy_interpolation_interpolate_1d ()">gwy_interpolation_interpolate_1d</a> (<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> x</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *coeff</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-interpolate-2d" title="gwy_interpolation_interpolate_2d ()">gwy_interpolation_interpolate_2d</a> (<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> x</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> y</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> rowstride</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *coeff</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-resample-block-1d" title="gwy_interpolation_resample_block_1d ()">gwy_interpolation_resample_block_1d</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</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> *data</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> newlength</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> *newdata</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</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> preserve</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-resample-block-2d" title="gwy_interpolation_resample_block_2d ()">gwy_interpolation_resample_block_2d</a> (<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#gint"><span class="type">gint</span></a> rowstride</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> *data</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> newwidth</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> newheight</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> newrowstride</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> *newdata</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</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> preserve</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-resolve-coeffs-1d" title="gwy_interpolation_resolve_coeffs_1d ()">gwy_interpolation_resolve_coeffs_1d</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n</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> *data</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-resolve-coeffs-2d" title="gwy_interpolation_resolve_coeffs_2d ()">gwy_interpolation_resolve_coeffs_2d</a> (<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#gint"><span class="type">gint</span></a> rowstride</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> *data</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-shift-block-1d" title="gwy_interpolation_shift_block_1d ()">gwy_interpolation_shift_block_1d</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</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> *data</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> offset</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> *newdata</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyExteriorType" title="enum GwyExteriorType"><span class="type">GwyExteriorType</span></a> exterior</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> fill_value</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> preserve</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libgwyprocess-interpolation.description"></a><h2>Description</h2>
<p>
Data interpolation is usually pixel-like in Gwyddion, not function-like.
That means the contribution of individual data saples is preserved on
scaling (the area that <span class="quote">“<span class="quote">belongs</span>”</span> to all values is the same,
it is not reduced to half for edge pixels).
</p>
<p>
Most of the functions listed here are quite low-level and typically one
would use <a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> or <a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="type">GwyDataLine</span></a> methods instead of these functions.
</p>
</div>
<div class="refsect1">
<a name="libgwyprocess-interpolation.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gwy-interpolation-get-dval"></a><h3>gwy_interpolation_get_dval ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> gwy_interpolation_get_dval (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</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> x1_</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> y1_</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> x2_</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> y2_</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
This function uses two-point interpolation
methods to get interpolated value between
two arbitrary data points.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>requested value coordinate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1_</code></em> :</span></p></td>
<td>x coordinate of first value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1_</code></em> :</span></p></td>
<td>y coordinate of first value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x2_</code></em> :</span></p></td>
<td>x coordinate of second value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y2_</code></em> :</span></p></td>
<td>y coordinate of second value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>interpolation type</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>interpolated value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-get-dval-of-equidists"></a><h3>gwy_interpolation_get_dval_of_equidists ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> gwy_interpolation_get_dval_of_equidists
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</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> *data</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
Computes interpolated value from 2 or 4 equidistant values.
</p>
<p>
For <a class="link" href="libgwyprocess-gwyprocessenums.html#GWY-INTERPOLATION-NONE:CAPS"><code class="literal">GWY_INTERPOLATION_NONE</code></a> no <em class="parameter"><code>data</code></em> value is actually used, and zero is
returned.
</p>
<p>
For <a class="link" href="libgwyprocess-gwyprocessenums.html#GWY-INTERPOLATION-ROUND:CAPS"><code class="literal">GWY_INTERPOLATION_ROUND</code></a> or <a class="link" href="libgwyprocess-gwyprocessenums.html#GWY-INTERPOLATION-LINEAR:CAPS"><code class="literal">GWY_INTERPOLATION_LINEAR</code></a>
it is enough to set middle two <em class="parameter"><code>data</code></em> values, that to use <em class="parameter"><code>data</code></em> in format
{0, data[i], data[i+1], 0} and function computes value at data[i+x]
(the outer values are not used).
</p>
<p>
For four value interpolations you have to prepare <em class="parameter"><code>data</code></em> as
{data[i-1], data[i], data[i+1], data[i+2]} and function again
returns value at data[i+x].
</p>
<p>
Interpolation with non-interpolating bases are silently replaced with an
interpolating function with the same support size. See
<a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-interpolate-1d" title="gwy_interpolation_interpolate_1d ()"><code class="function">gwy_interpolation_interpolate_1d()</code></a> for a function interpolating from
interpolation coefficients.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>Possibily noninteger position in <em class="parameter"><code>data</code></em> to get value at.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>Array of 4 values to interpolate between (see below).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to use.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Interpolated value.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-get-support-size"></a><h3>gwy_interpolation_get_support_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_interpolation_get_support_size (<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
Obtains the basis support size for an interpolation type.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The length of the support interval of the interpolation basis.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-has-interpolating-basis"></a><h3>gwy_interpolation_has_interpolating_basis ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_interpolation_has_interpolating_basis
(<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
Obtains the interpolating basis property of an inteprolation type.
</p>
<p>
Interpolation types with inteprolating basis directly use data values
for interpolation. For these types <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-resolve-coeffs-1d" title="gwy_interpolation_resolve_coeffs_1d ()"><code class="function">gwy_interpolation_resolve_coeffs_1d()</code></a>
and <a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-resolve-coeffs-2d" title="gwy_interpolation_resolve_coeffs_2d ()"><code class="function">gwy_interpolation_resolve_coeffs_2d()</code></a> are no-op.
</p>
<p>
Generalized interpolation types (with non-interpolation basis) require to
preprocess the data values to obtain interpolation coefficients first. On
the ohter hand they typically offer much higher interpolation quality.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type.</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 the inteprolation type has interpolating basis,
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if data values cannot be directly used for interpolation
of this type.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-interpolate-1d"></a><h3>gwy_interpolation_interpolate_1d ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> gwy_interpolation_interpolate_1d (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *coeff</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
Interpolates a signle data point in one dimension.
</p>
<p>
The interpolation basis support size can be obtained generically with
<a class="link" href="libgwyprocess-interpolation.html#gwy-interpolation-get-support-size" title="gwy_interpolation_get_support_size ()"><code class="function">gwy_interpolation_get_support_size()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>Position in interval [0,1) to get value at.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>coeff</code></em> :</span></p></td>
<td>Array of support-length size with interpolation coefficients
(that are equal to data values for an interpolating basis).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to use.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Interpolated value.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-interpolate-2d"></a><h3>gwy_interpolation_interpolate_2d ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> gwy_interpolation_interpolate_2d (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</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> y</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> rowstride</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *coeff</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
Interpolates a signle data point in two dimensions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>X-position in interval [0,1) to get value at.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>Y-position in interval [0,1) to get value at.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rowstride</code></em> :</span></p></td>
<td>Row stride of <em class="parameter"><code>coeff</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>coeff</code></em> :</span></p></td>
<td>Array of support-length-squared size with interpolation coefficients
(that are equal to data values for an interpolating basis).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to use.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Interpolated value.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-resample-block-1d"></a><h3>gwy_interpolation_resample_block_1d ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_interpolation_resample_block_1d (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</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> *data</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> newlength</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> *newdata</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</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> preserve</code></em>);</pre>
<p>
Resamples a one-dimensional data array.
</p>
<p>
This is a primitive operation, in most cases methods such as
<a class="link" href="GwyDataLine.html#gwy-data-line-new-resampled" title="gwy_data_line_new_resampled ()"><code class="function">gwy_data_line_new_resampled()</code></a> provide more convenient interface.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>Data block length.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>Data block to resample.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newlength</code></em> :</span></p></td>
<td>Requested length after resampling.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newdata</code></em> :</span></p></td>
<td>Array to put the resampled data to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to use.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>preserve</code></em> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to preserve the content of <em class="parameter"><code>data</code></em>, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to permit its
overwriting with temporary data.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-resample-block-2d"></a><h3>gwy_interpolation_resample_block_2d ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_interpolation_resample_block_2d (<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#gint"><span class="type">gint</span></a> rowstride</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> *data</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> newwidth</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> newheight</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> newrowstride</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> *newdata</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</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> preserve</code></em>);</pre>
<p>
Resamples a two-dimensional data array.
</p>
<p>
This is a primitive operation, in most cases methods such as
<a class="link" href="GwyDataField.html#gwy-data-field-new-resampled" title="gwy_data_field_new_resampled ()"><code class="function">gwy_data_field_new_resampled()</code></a> provide more convenient interface.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Number of columns in <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Number of rows in <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rowstride</code></em> :</span></p></td>
<td>Total row length (including <em class="parameter"><code>width</code></em>).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>Data block to resample.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newwidth</code></em> :</span></p></td>
<td>Requested number of columns after resampling.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newheight</code></em> :</span></p></td>
<td>Requested number of rows after resampling.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newrowstride</code></em> :</span></p></td>
<td>Requested total row length after resampling (including
<em class="parameter"><code>newwidth</code></em>).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newdata</code></em> :</span></p></td>
<td>Array to put the resampled data to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to use.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>preserve</code></em> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to preserve the content of <em class="parameter"><code>data</code></em>, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to permit its
overwriting with temporary data.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-resolve-coeffs-1d"></a><h3>gwy_interpolation_resolve_coeffs_1d ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_interpolation_resolve_coeffs_1d (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n</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> *data</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
Transforms data values in a one-dimensional array to interpolation
coefficients.
</p>
<p>
This function is no-op for interpolation types with finite-support
interpolating function. Therefore you can also omit it and use the data
array directly for these interpolation types.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>Number of points in <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>An array of data values. It will be rewritten with the coefficients.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to prepare <em class="parameter"><code>data</code></em> for.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-resolve-coeffs-2d"></a><h3>gwy_interpolation_resolve_coeffs_2d ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_interpolation_resolve_coeffs_2d (<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#gint"><span class="type">gint</span></a> rowstride</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> *data</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>);</pre>
<p>
Transforms data values in a two-dimensional array to interpolation
coefficients.
</p>
<p>
This function is no-op for interpolation types with finite-support
interpolating function. Therefore you can also omit it and use the data
array directly for these interpolation types.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Number of columns in <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Number of rows in <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rowstride</code></em> :</span></p></td>
<td>Total row length (including <em class="parameter"><code>width</code></em>).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>An array of data values. It will be rewritten with the coefficients.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to prepare <em class="parameter"><code>data</code></em> for.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-interpolation-shift-block-1d"></a><h3>gwy_interpolation_shift_block_1d ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_interpolation_shift_block_1d (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</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> *data</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> offset</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> *newdata</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyInterpolationType" title="enum GwyInterpolationType"><span class="type">GwyInterpolationType</span></a> interpolation</code></em>,
<em class="parameter"><code><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyExteriorType" title="enum GwyExteriorType"><span class="type">GwyExteriorType</span></a> exterior</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> fill_value</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> preserve</code></em>);</pre>
<p>
Shifts a one-dimensional data block by a possibly non-integer offset.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>Data block length.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>Data block to shift.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>The shift, in corrective sense. Shift value of 1.0 means the
zeroth value of <em class="parameter"><code>newdata</code></em> will be set to the first value of <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newdata</code></em> :</span></p></td>
<td>Array to put the shifted data to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation type to use.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>exterior</code></em> :</span></p></td>
<td>Exterior pixels handling.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fill_value</code></em> :</span></p></td>
<td>The value to use with <em class="parameter"><code>GWY_EXTERIOR_FIXED_VALUE</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>preserve</code></em> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to preserve the content of <em class="parameter"><code>data</code></em>, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to permit its
overwriting with temporary data.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
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