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<h2><span class="refentrytitle"><a name="GwyTriangulation.top_of_page"></a>triangulation</span></h2>
<p>triangulation — Delaunay and Voronoi triangulation and interpolation</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="GwyTriangulation.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libprocess/gwyprocess.h>
struct <a class="link" href="GwyTriangulation.html#GwyTriangulation-struct" title="struct GwyTriangulation">GwyTriangulation</a>;
struct <a class="link" href="GwyTriangulation.html#GwyTriangulationClass" title="struct GwyTriangulationClass">GwyTriangulationClass</a>;
#define <a class="link" href="GwyTriangulation.html#GWY-TRIANGULATION-NONE:CAPS" title="GWY_TRIANGULATION_NONE">GWY_TRIANGULATION_NONE</a>
<a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData">GwyTriangulationData</a>;
<a class="link" href="GwyTriangulation.html#GwyTriangulationPointXY" title="GwyTriangulationPointXY">GwyTriangulationPointXY</a>;
<a class="link" href="GwyTriangulation.html#GwyTriangulationPointXYZ" title="GwyTriangulationPointXYZ">GwyTriangulationPointXYZ</a>;
<a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="returnvalue">GwyTriangulationData</span></a> * <a class="link" href="GwyTriangulation.html#gwy-triangulation-boundary" title="gwy_triangulation_boundary ()">gwy_triangulation_boundary</a> (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyTriangulation.html#gwy-triangulation-data-free" title="gwy_triangulation_data_free ()">gwy_triangulation_data_free</a> (<em class="parameter"><code><a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a> *triangulation_data</code></em>);
<a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="returnvalue">GwyTriangulationData</span></a> * <a class="link" href="GwyTriangulation.html#gwy-triangulation-delaunay" title="gwy_triangulation_delaunay ()">gwy_triangulation_delaunay</a> (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</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="GwyTriangulation.html#gwy-triangulation-interpolate" title="gwy_triangulation_interpolate ()">gwy_triangulation_interpolate</a> (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</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="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *dfield</code></em>);
<a class="link" href="GwyTriangulation.html" title="triangulation"><span class="returnvalue">GwyTriangulation</span></a> * <a class="link" href="GwyTriangulation.html#gwy-triangulation-new" title="gwy_triangulation_new ()">gwy_triangulation_new</a> (<em class="parameter"><code><span class="type">void</span></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="GwyTriangulation.html#gwy-triangulation-triangulate" title="gwy_triangulation_triangulate ()">gwy_triangulation_triangulate</a> (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> npoints</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> points</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> point_size</code></em>);
<a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="returnvalue">GwyTriangulationData</span></a> * <a class="link" href="GwyTriangulation.html#gwy-triangulation-voronoi" title="gwy_triangulation_voronoi ()">gwy_triangulation_voronoi</a> (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *nvpoints</code></em>,
<em class="parameter"><code>const <a class="link" href="GwyTriangulation.html#GwyTriangulationPointXY" title="GwyTriangulationPointXY"><span class="type">GwyTriangulationPointXY</span></a> **vpoints</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GwyTriangulation.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----GwyTriangulation
</pre>
</div>
<div class="refsect1">
<a name="GwyTriangulation.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="GwyTriangulation.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GwyTriangulation-struct"></a><h3>struct GwyTriangulation</h3>
<pre class="programlisting">struct GwyTriangulation;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyTriangulationClass"></a><h3>struct GwyTriangulationClass</h3>
<pre class="programlisting">struct GwyTriangulationClass {
GObjectClass parent_class;
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GWY-TRIANGULATION-NONE:CAPS"></a><h3>GWY_TRIANGULATION_NONE</h3>
<pre class="programlisting">#define GWY_TRIANGULATION_NONE G_MAXUINT
</pre>
<p>
Point index value representing no point.
</p>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyTriangulationData"></a><h3>GwyTriangulationData</h3>
<pre class="programlisting">typedef struct {
guint npoints;
guint size;
const guint *index;
const guint *neighbours;
} GwyTriangulationData;
</pre>
<p>
Representation of raw triangulation data.
</p>
<p>
Members <em class="parameter"><code>index</code></em> and <em class="parameter"><code>neighbours</code></em> are owned by the <a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> object
that provided this data and remain valid only until this object is destroyed
or used to perform another triangulation.
</p>
<p>
The exact interpretation of individual parts depends on what kind of
triangulation data it is and may differ a bit from the general description
provided here. See the descriptions of individual methods returning
<a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GwyTriangulationData.npoints"></a>npoints</code></em>;</span></p></td>
<td>Number of points in the set, also detrmines the size of <em class="parameter"><code>index</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GwyTriangulationData.size"></a>size</code></em>;</span></p></td>
<td>The length of <em class="parameter"><code>neighbours</code></em>.</td>
</tr>
<tr>
<td><p><span class="term">const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *<em class="structfield"><code><a name="GwyTriangulationData.index"></a>index</code></em>;</span></p></td>
<td>Array of size <em class="parameter"><code>npoints</code></em>+1 defining the blocks of neighbours in
<em class="parameter"><code>neighbours</code></em>. The block for point <em class="parameter"><code>i</code></em> starts at <em class="parameter"><code>index</code></em>[<em class="parameter"><code>i</code></em>] and ends
one element before <em class="parameter"><code>index</code></em>[<em class="parameter"><code>i</code></em>+1]. Hence the last of <em class="parameter"><code>index</code></em> is equal
to <em class="parameter"><code>size</code></em>.</td>
</tr>
<tr>
<td><p><span class="term">const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *<em class="structfield"><code><a name="GwyTriangulationData.neighbours"></a>neighbours</code></em>;</span></p></td>
<td>Neighbours of each point, represented as indices into some
array (which array, that depends on what kind of data it is).
The points in each block are sorted counter-clockwise.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyTriangulationPointXY"></a><h3>GwyTriangulationPointXY</h3>
<pre class="programlisting">typedef struct {
gdouble x;
gdouble y;
} GwyTriangulationPointXY;
</pre>
<p>
Representation of a point in plane for triangulation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyTriangulationPointXY.x"></a>x</code></em>;</span></p></td>
<td>X-coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyTriangulationPointXY.y"></a>y</code></em>;</span></p></td>
<td>Y-coordinate.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyTriangulationPointXYZ"></a><h3>GwyTriangulationPointXYZ</h3>
<pre class="programlisting">typedef struct {
gdouble x;
gdouble y;
gdouble z;
} GwyTriangulationPointXYZ;
</pre>
<p>
Representation of a point in plane with associated value for interpolation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyTriangulationPointXYZ.x"></a>x</code></em>;</span></p></td>
<td>X-coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyTriangulationPointXYZ.y"></a>y</code></em>;</span></p></td>
<td>Y-coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyTriangulationPointXYZ.z"></a>z</code></em>;</span></p></td>
<td>Z-coordinate, i.e. the value in point (<em class="parameter"><code>x</code></em>,<em class="parameter"><code>y</code></em>).</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-triangulation-boundary"></a><h3>gwy_triangulation_boundary ()</h3>
<pre class="programlisting"><a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="returnvalue">GwyTriangulationData</span></a> * gwy_triangulation_boundary (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</code></em>);</pre>
<p>
Obtains the boundary, i.e. convex hull, of Delaunay triangulation.
</p>
<p>
Notes to the fields in the returned struct:
</p>
<p>
<em class="parameter"><code>npoints</code></em> equals to the number of points passed to
<a class="link" href="GwyTriangulation.html#gwy-triangulation-triangulate" title="gwy_triangulation_triangulate ()"><code class="function">gwy_triangulation_triangulate()</code></a>.
</p>
<p>
<em class="parameter"><code>size</code></em> is the boundary length.
</p>
<p>
<em class="parameter"><code>index</code></em>[] contains point indices in the boundary for points on the boundary;
and <a class="link" href="GwyTriangulation.html#GWY-TRIANGULATION-NONE:CAPS" title="GWY_TRIANGULATION_NONE"><code class="literal">GWY_TRIANGULATION_NONE</code></a> for points not on the boundary.
</p>
<p>
<em class="parameter"><code>neighbours</code></em>[] lists sequentially the boundary points.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangulation</code></em> :</span></p></td>
<td>Triangulation.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Newly clreated <a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a> that must be freed with
<a class="link" href="GwyTriangulation.html#gwy-triangulation-data-free" title="gwy_triangulation_data_free ()"><code class="function">gwy_triangulation_data_free()</code></a> when no longer used. The data within
is owned by <em class="parameter"><code>triangulation</code></em>, see <a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-triangulation-data-free"></a><h3>gwy_triangulation_data_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_triangulation_data_free (<em class="parameter"><code><a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a> *triangulation_data</code></em>);</pre>
<p>
Frees raw triangulation data.
</p>
<p>
This function should be used to free triangulation data returned by
<a class="link" href="GwyTriangulation.html#gwy-triangulation-delaunay" title="gwy_triangulation_delaunay ()"><code class="function">gwy_triangulation_delaunay()</code></a> and similar. It does not free the array
members as they are owned by the triangulation object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>triangulation_data</code></em> :</span></p></td>
<td>Raw triangulation data.</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-triangulation-delaunay"></a><h3>gwy_triangulation_delaunay ()</h3>
<pre class="programlisting"><a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="returnvalue">GwyTriangulationData</span></a> * gwy_triangulation_delaunay (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</code></em>);</pre>
<p>
Obtains the Delaunay triangulation data.
</p>
<p>
Notes to the fields in the returned struct:
</p>
<p>
<em class="parameter"><code>npoints</code></em> equals to the number of points passed to
<a class="link" href="GwyTriangulation.html#gwy-triangulation-triangulate" title="gwy_triangulation_triangulate ()"><code class="function">gwy_triangulation_triangulate()</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>triangulation</code></em> :</span></p></td>
<td>Triangulation.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Newly clreated <a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a> that must be freed with
<a class="link" href="GwyTriangulation.html#gwy-triangulation-data-free" title="gwy_triangulation_data_free ()"><code class="function">gwy_triangulation_data_free()</code></a> when no longer used. The data within
is owned by <em class="parameter"><code>triangulation</code></em>, see <a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-triangulation-interpolate"></a><h3>gwy_triangulation_interpolate ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_triangulation_interpolate (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</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="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *dfield</code></em>);</pre>
<p>
Regularizes XYZ data to a grid, represented by a data field.
</p>
<p>
The area and resolution of the regular grid is given by the dimensions and
offsets of <em class="parameter"><code>dfield</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangulation</code></em> :</span></p></td>
<td>Triangulation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolation</code></em> :</span></p></td>
<td>Interpolation to use. Only <em class="parameter"><code>GWY_INTERPOLATION_ROUND</code></em> and
<em class="parameter"><code>GWY_INTERPOLATION_LINEAR</code></em> are implemented. Is is an error
to pass any other interpolation type.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dfield</code></em> :</span></p></td>
<td>Data field to fill with interpolated values.</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 interpolation succeeds, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> on failure, e.g. due to
numerical errors. In the latter case the contents of <em class="parameter"><code>dfield</code></em> is
undefined.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-triangulation-new"></a><h3>gwy_triangulation_new ()</h3>
<pre class="programlisting"><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="returnvalue">GwyTriangulation</span></a> * gwy_triangulation_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Creates a new triangulation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A new empty triangulation.</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-triangulation-triangulate"></a><h3>gwy_triangulation_triangulate ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_triangulation_triangulate (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</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> npoints</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> points</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> point_size</code></em>);</pre>
<p>
Finds Delaunay and Voronoi triangulations for a set of points in plane.
</p>
<p>
The triangulation might not work in numerically unstable cases. At present
this includes various ambiguous cases with neighbour points on straight
lines or circles. Also, no points in the input set may coincide.
</p>
<p>
It is possible to call this method successively on several different sets
of points to triangulate each separately. Note that pointers in data
returned by methods such as <a class="link" href="GwyTriangulation.html#gwy-triangulation-delaunay" title="gwy_triangulation_delaunay ()"><code class="function">gwy_triangulation_delaunay()</code></a> become invalid
then.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangulation</code></em> :</span></p></td>
<td>Triangulation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>npoints</code></em> :</span></p></td>
<td>Number of points.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>points</code></em> :</span></p></td>
<td>Array of points. They must be typecastable to
<a class="link" href="GwyTriangulation.html#GwyTriangulationPointXY" title="GwyTriangulationPointXY"><span class="type">GwyTriangulationPointXY</span></a> for triangulation and to
<a class="link" href="GwyTriangulation.html#GwyTriangulationPointXYZ" title="GwyTriangulationPointXYZ"><span class="type">GwyTriangulationPointXYZ</span></a> for interpolation. However, they can be
larger than that. The actual struct size is indicated by
<em class="parameter"><code>point_size</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>point_size</code></em> :</span></p></td>
<td>Size of point struct, in bytes.</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> on success, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> on failure. On failure the triangulation
is empty.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-triangulation-voronoi"></a><h3>gwy_triangulation_voronoi ()</h3>
<pre class="programlisting"><a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="returnvalue">GwyTriangulationData</span></a> * gwy_triangulation_voronoi (<em class="parameter"><code><a class="link" href="GwyTriangulation.html" title="triangulation"><span class="type">GwyTriangulation</span></a> *triangulation</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> *nvpoints</code></em>,
<em class="parameter"><code>const <a class="link" href="GwyTriangulation.html#GwyTriangulationPointXY" title="GwyTriangulationPointXY"><span class="type">GwyTriangulationPointXY</span></a> **vpoints</code></em>);</pre>
<p>
Obtains the Voronoi triangulation data.
</p>
<p>
Notes to the fields in the returned struct:
</p>
<p>
<em class="parameter"><code>npoints</code></em> equals to the number of Delaunay triangulation points passed to
<a class="link" href="GwyTriangulation.html#gwy-triangulation-triangulate" title="gwy_triangulation_triangulate ()"><code class="function">gwy_triangulation_triangulate()</code></a> plus the number of points in the Voronoi
triangulation, <em class="parameter"><code>nvpoints</code></em>.
</p>
<p>
<em class="parameter"><code>index</code></em>[] is the usual index of blocks in <em class="parameter"><code>neighbours</code></em>, however,
point indices smaller than the number of Delaunay points correspond to the
Delaunay points, point indices equal or larger correspond to points in
<em class="parameter"><code>vpoints</code></em> (it is necessary to subtract the number of original points to
obtain the real position in <em class="parameter"><code>vpoints</code></em>).
</p>
<p>
<em class="parameter"><code>neighbours</code></em>[] contains the neighbour blocks, with above caveats about
point numbering.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangulation</code></em> :</span></p></td>
<td>Triangulation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nvpoints</code></em> :</span></p></td>
<td>Location to store the number of new Voronoi triangulation points,
or <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>vpoints</code></em> :</span></p></td>
<td>Location to store pointer to the Voronoi triangulation points,
or <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"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Newly clreated <a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a> that must be freed with
<a class="link" href="GwyTriangulation.html#gwy-triangulation-data-free" title="gwy_triangulation_data_free ()"><code class="function">gwy_triangulation_data_free()</code></a> when no longer used. The data within
is owned by <em class="parameter"><code>triangulation</code></em>, see <a class="link" href="GwyTriangulation.html#GwyTriangulationData" title="GwyTriangulationData"><span class="type">GwyTriangulationData</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
</div>
</div>
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