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<h2><span class="refentrytitle"><a name="GwyGrainValue.top_of_page"></a>GwyGrainValue</span></h2>
<p>GwyGrainValue — Grain value resource type</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="GwyGrainValue.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libprocess/gwyprocess.h>
struct <a class="link" href="GwyGrainValue.html#GwyGrainValue-struct" title="struct GwyGrainValue">GwyGrainValue</a>;
struct <a class="link" href="GwyGrainValue.html#GwyGrainValueClass" title="struct GwyGrainValueClass">GwyGrainValueClass</a>;
enum <a class="link" href="GwyGrainValue.html#GwyGrainValueGroup" title="enum GwyGrainValueGroup">GwyGrainValueGroup</a>;
enum <a class="link" href="GwyGrainValue.html#GwyGrainValueFlags" title="enum GwyGrainValueFlags">GwyGrainValueFlags</a>;
<a class="link" href="GwyGrainValue.html#GwyGrainValueData" title="GwyGrainValueData">GwyGrainValueData</a>;
<a class="link" href="GwyGrainValue.html#GwyGrainValueGroup" title="enum GwyGrainValueGroup"><span class="returnvalue">GwyGrainValueGroup</span></a> <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-group" title="gwy_grain_value_get_group ()">gwy_grain_value_get_group</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);
const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-symbol" title="gwy_grain_value_get_symbol ()">gwy_grain_value_get_symbol</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyGrainValue.html#gwy-grain-value-set-symbol" title="gwy_grain_value_set_symbol ()">gwy_grain_value_set_symbol</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *symbol</code></em>);
const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-symbol-markup" title="gwy_grain_value_get_symbol_markup ()">gwy_grain_value_get_symbol_markup</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyGrainValue.html#gwy-grain-value-set-symbol-markup" title="gwy_grain_value_set_symbol_markup ()">gwy_grain_value_set_symbol_markup</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *symbol</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="GwyGrainValue.html#gwy-grain-value-get-power-xy" title="gwy_grain_value_get_power_xy ()">gwy_grain_value_get_power_xy</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyGrainValue.html#gwy-grain-value-set-power-xy" title="gwy_grain_value_set_power_xy ()">gwy_grain_value_set_power_xy</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</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> power_xy</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="GwyGrainValue.html#gwy-grain-value-get-power-z" title="gwy_grain_value_get_power_z ()">gwy_grain_value_get_power_z</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyGrainValue.html#gwy-grain-value-set-power-z" title="gwy_grain_value_set_power_z ()">gwy_grain_value_set_power_z</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</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> power_z</code></em>);
<a class="link" href="GwyGrainValue.html#GwyGrainValueFlags" title="enum GwyGrainValueFlags"><span class="returnvalue">GwyGrainValueFlags</span></a> <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-flags" title="gwy_grain_value_get_flags ()">gwy_grain_value_get_flags</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyGrainValue.html#gwy-grain-value-set-flags" title="gwy_grain_value_set_flags ()">gwy_grain_value_set_flags</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code><a class="link" href="GwyGrainValue.html#GwyGrainValueFlags" title="enum GwyGrainValueFlags"><span class="type">GwyGrainValueFlags</span></a> flags</code></em>);
<a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="returnvalue">GwyGrainQuantity</span></a> <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-quantity" title="gwy_grain_value_get_quantity ()">gwy_grain_value_get_quantity</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);
const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-expression" title="gwy_grain_value_get_expression ()">gwy_grain_value_get_expression</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</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="GwyGrainValue.html#gwy-grain-value-set-expression" title="gwy_grain_value_set_expression ()">gwy_grain_value_set_expression</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *expression</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GwyGrainValue.html#gwy-grain-value-group-name" title="gwy_grain_value_group_name ()">gwy_grain_value_group_name</a> (<em class="parameter"><code><a class="link" href="GwyGrainValue.html#GwyGrainValueGroup" title="enum GwyGrainValueGroup"><span class="type">GwyGrainValueGroup</span></a> group</code></em>);
<a href="../libgwyddion/GwyInventory.html"><span class="returnvalue">GwyInventory</span></a> * <a class="link" href="GwyGrainValue.html#gwy-grain-values" title="gwy_grain_values ()">gwy_grain_values</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="returnvalue">GwyGrainValue</span></a> * <a class="link" href="GwyGrainValue.html#gwy-grain-values-get-grain-value" title="gwy_grain_values_get_grain_value ()">gwy_grain_values_get_grain_value</a> (<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
<a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="returnvalue">GwyGrainValue</span></a> * <a class="link" href="GwyGrainValue.html#gwy-grain-values-get-builtin-grain-value" title="gwy_grain_values_get_builtin_grain_value ()">gwy_grain_values_get_builtin_grain_value</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>);
<span class="returnvalue">void</span> <a class="link" href="GwyGrainValue.html#gwy-grain-values-calculate" title="gwy_grain_values_calculate ()">gwy_grain_values_calculate</a> (<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> nvalues</code></em>,
<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> **gvalues</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> **results</code></em>,
<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#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>);
</pre>
</div>
<div class="refsect1">
<a name="GwyGrainValue.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="../libgwyddion/GwyResource.html">GwyResource</a>
+----GwyGrainValue
</pre>
</div>
<div class="refsect1">
<a name="GwyGrainValue.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="GwyGrainValue.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GwyGrainValue-struct"></a><h3>struct GwyGrainValue</h3>
<pre class="programlisting">struct GwyGrainValue;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyGrainValueClass"></a><h3>struct GwyGrainValueClass</h3>
<pre class="programlisting">struct GwyGrainValueClass {
GwyResourceClass parent_class;
void (*reserved1)(void);
void (*reserved2)(void);
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyGrainValueGroup"></a><h3>enum GwyGrainValueGroup</h3>
<pre class="programlisting">typedef enum {
GWY_GRAIN_VALUE_GROUP_ID = 0,
GWY_GRAIN_VALUE_GROUP_POSITION,
GWY_GRAIN_VALUE_GROUP_VALUE,
GWY_GRAIN_VALUE_GROUP_AREA,
GWY_GRAIN_VALUE_GROUP_VOLUME,
GWY_GRAIN_VALUE_GROUP_BOUNDARY,
GWY_GRAIN_VALUE_GROUP_SLOPE,
GWY_GRAIN_VALUE_GROUP_CURVATURE,
GWY_GRAIN_VALUE_GROUP_USER = 30
} GwyGrainValueGroup;
</pre>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-ID:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_ID</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-POSITION:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_POSITION</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-VALUE:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_VALUE</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-AREA:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_AREA</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-VOLUME:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_VOLUME</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-BOUNDARY:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_BOUNDARY</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-SLOPE:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_SLOPE</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-CURVATURE:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_CURVATURE</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-GROUP-USER:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_GROUP_USER</code></span></p></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GwyGrainValueFlags"></a><h3>enum GwyGrainValueFlags</h3>
<pre class="programlisting">typedef enum {
GWY_GRAIN_VALUE_SAME_UNITS = 1 << 0,
GWY_GRAIN_VALUE_IS_ANGLE = 1 << 1
} GwyGrainValueFlags;
</pre>
<p>
Special attributes of grain values.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-SAME-UNITS:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_SAME_UNITS</code></span></p></td>
<td>Certain grain quantities, such as the surface
area or absolute inclination, are only
meaningful if value (height) is the same
physical quantity as lateral dimensions. These
have this flag set to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>.
</td>
</tr>
<tr>
<td><p><a name="GWY-GRAIN-VALUE-IS-ANGLE:CAPS"></a><span class="term"><code class="literal">GWY_GRAIN_VALUE_IS_ANGLE</code></span></p></td>
<td>Angular quantities are internally always
calculated in radians, however they can be
presented in degrees in the user interface.
To enable such special handling, set this
flag to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyGrainValueData"></a><h3>GwyGrainValueData</h3>
<pre class="programlisting">typedef struct {
GwyGrainValueGroup group;
gchar *symbol_markup;
gchar *symbol;
gchar *reserveds;
gint power_xy;
gint power_z;
guint flags;
gint reservedi;
} GwyGrainValueData;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-group"></a><h3>gwy_grain_value_get_group ()</h3>
<pre class="programlisting"><a class="link" href="GwyGrainValue.html#GwyGrainValueGroup" title="enum GwyGrainValueGroup"><span class="returnvalue">GwyGrainValueGroup</span></a> gwy_grain_value_get_group (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Gets the group of a grain value.
</p>
<p>
All user-defined grain values belong to <a class="link" href="GwyGrainValue.html#GWY-GRAIN-VALUE-GROUP-USER:CAPS"><code class="literal">GWY_GRAIN_VALUE_GROUP_USER</code></a> group,
built-in grain values belong to other groups.
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The group of <em class="parameter"><code>gvalue</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-symbol"></a><h3>gwy_grain_value_get_symbol ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gwy_grain_value_get_symbol (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Gets the plain symbol representing a grain value.
</p>
<p>
The plain symbol is used in expressions. It has to be a valid
identifier and it should be easy to type. (Note currently it is not
possible to use user-defined grain quantities in expressions for other
user-defined grain quantities.)
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Plain symbol of <em class="parameter"><code>gvalue</code></em>, owned by <em class="parameter"><code>gvalue</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-set-symbol"></a><h3>gwy_grain_value_set_symbol ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_grain_value_set_symbol (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *symbol</code></em>);</pre>
<p>
Sets the plain symbol representing a grain value.
</p>
<p>
See <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-symbol" title="gwy_grain_value_get_symbol ()"><code class="function">gwy_grain_value_get_symbol()</code></a> for details.
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>symbol</code></em> :</span></p></td>
<td>The new symbol.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-symbol-markup"></a><h3>gwy_grain_value_get_symbol_markup ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gwy_grain_value_get_symbol_markup (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Gets the rich text symbol representing a grain value.
</p>
<p>
The returned value can contain Pango markup and is suitable for instance
for graph axis labels.
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Rich text symbol of <em class="parameter"><code>gvalue</code></em>, owned by <em class="parameter"><code>gvalue</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-set-symbol-markup"></a><h3>gwy_grain_value_set_symbol_markup ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_grain_value_set_symbol_markup (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *symbol</code></em>);</pre>
<p>
Sets the rich text symbol representing a grain value.
</p>
<p>
See <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-symbol-markup" title="gwy_grain_value_get_symbol_markup ()"><code class="function">gwy_grain_value_get_symbol_markup()</code></a> for details.
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>symbol</code></em> :</span></p></td>
<td>The new symbol.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-power-xy"></a><h3>gwy_grain_value_get_power_xy ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_grain_value_get_power_xy (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Gets the power of lateral dimensions in a grain value.
</p>
<p>
The units of a grain value are determined as the product of lateral units
and value units, raised to certain powers. For instance lengths in the
horizontal plane have xy power of 1 and areas have 2, whereas volumes have
xy power of 2 and value power of 1.
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The power of lateral dimensions.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-set-power-xy"></a><h3>gwy_grain_value_set_power_xy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_grain_value_set_power_xy (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</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> power_xy</code></em>);</pre>
<p>
Sets the power of lateral dimensions in a grain 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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>power_xy</code></em> :</span></p></td>
<td>The new lateral dimensions power.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-power-z"></a><h3>gwy_grain_value_get_power_z ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_grain_value_get_power_z (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Gets the power of value (height) in a grain value.
</p>
<p>
See <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-power-xy" title="gwy_grain_value_get_power_xy ()"><code class="function">gwy_grain_value_get_power_xy()</code></a> for details.
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The power of value (height).</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-set-power-z"></a><h3>gwy_grain_value_set_power_z ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_grain_value_set_power_z (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</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> power_z</code></em>);</pre>
<p>
Sets the power of value (height) in a grain 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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>power_z</code></em> :</span></p></td>
<td>The new value (height) power.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-flags"></a><h3>gwy_grain_value_get_flags ()</h3>
<pre class="programlisting"><a class="link" href="GwyGrainValue.html#GwyGrainValueFlags" title="enum GwyGrainValueFlags"><span class="returnvalue">GwyGrainValueFlags</span></a> gwy_grain_value_get_flags (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Obtains the special attributes 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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The special attribute flags set on <em class="parameter"><code>gvalue</code></em>. See
<a class="link" href="GwyGrainValue.html#GwyGrainValueFlags" title="enum GwyGrainValueFlags"><span class="type">GwyGrainValueFlags</span></a> for their description.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-set-flags"></a><h3>gwy_grain_value_set_flags ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_grain_value_set_flags (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code><a class="link" href="GwyGrainValue.html#GwyGrainValueFlags" title="enum GwyGrainValueFlags"><span class="type">GwyGrainValueFlags</span></a> flags</code></em>);</pre>
<p>
Sets the special attributes of a grain quantity.
</p>
<p>
The value of <em class="parameter"><code>flags</code></em> determines the complete new set of flags. To set
individual flags, obtain the current set with <a class="link" href="GwyGrainValue.html#gwy-grain-value-get-flags" title="gwy_grain_value_get_flags ()"><code class="function">gwy_grain_value_get_flags()</code></a>
first and then set/unset individual flags.
</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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>The special attributes to set on <em class="parameter"><code>gvalue</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-quantity"></a><h3>gwy_grain_value_get_quantity ()</h3>
<pre class="programlisting"><a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="returnvalue">GwyGrainQuantity</span></a> gwy_grain_value_get_quantity (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Gets the built-in grain quantity corresponding to a grain 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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The corresponding built-in <a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> if <em class="parameter"><code>gvalue</code></em> is a
built-it grain value, -1 if <em class="parameter"><code>gvalue</code></em> is an user-defined grain value.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-get-expression"></a><h3>gwy_grain_value_get_expression ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gwy_grain_value_get_expression (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>);</pre>
<p>
Gets the expression of a user-defined grain 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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The expression as a string owned by <em class="parameter"><code>gvalue</code></em>, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if <em class="parameter"><code>gvalue</code></em>
is a built-in grain value.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-set-expression"></a><h3>gwy_grain_value_set_expression ()</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_value_set_expression (<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> *gvalue</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *expression</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Sets the expression of a user-defined grain value.
</p>
<p>
It is an error to call this function on a built-in 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>gvalue</code></em> :</span></p></td>
<td>A grain value object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>expression</code></em> :</span></p></td>
<td>New grain value expression.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Return location for the error, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore errors.</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 expression is compilable and references only known
grain quantities. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> is the expression is not calculable,
in this case the <em class="parameter"><code>gvalue</code></em>'s expression is unchanged.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-value-group-name"></a><h3>gwy_grain_value_group_name ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gwy_grain_value_group_name (<em class="parameter"><code><a class="link" href="GwyGrainValue.html#GwyGrainValueGroup" title="enum GwyGrainValueGroup"><span class="type">GwyGrainValueGroup</span></a> group</code></em>);</pre>
<p>
Obtains the name of a grain value group.
</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>group</code></em> :</span></p></td>
<td>Grain value group.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The grain value group name as a constant untranslated string,
owned by the library.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-values"></a><h3>gwy_grain_values ()</h3>
<pre class="programlisting"><a href="../libgwyddion/GwyInventory.html"><span class="returnvalue">GwyInventory</span></a> * gwy_grain_values (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Gets the inventory with all the grain values.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Grain value inventory.</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-values-get-grain-value"></a><h3>gwy_grain_values_get_grain_value ()</h3>
<pre class="programlisting"><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="returnvalue">GwyGrainValue</span></a> * gwy_grain_values_get_grain_value (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Convenience function to get a grain quantity from <a class="link" href="GwyGrainValue.html#gwy-grain-values" title="gwy_grain_values ()"><code class="function">gwy_grain_values()</code></a> by
name.
</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>name</code></em> :</span></p></td>
<td>Grain quantity name.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Grain quantity identified by <em class="parameter"><code>name</code></em> or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if there is no such
grain quantity.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-grain-values-get-builtin-grain-value"></a><h3>gwy_grain_values_get_builtin_grain_value ()</h3>
<pre class="programlisting"><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="returnvalue">GwyGrainValue</span></a> * gwy_grain_values_get_builtin_grain_value
(<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>
Obtains the built-in grain value corresponding to given enum value.
</p>
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<td><p><span class="term"><em class="parameter"><code>quantity</code></em> :</span></p></td>
<td>A <a class="link" href="libgwyprocess-gwyprocessenums.html#GwyGrainQuantity" title="enum GwyGrainQuantity"><span class="type">GwyGrainQuantity</span></a> value.</td>
</tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The built-in grain value corresponding to <em class="parameter"><code>quantity</code></em>, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if there
is no such grain value.</td>
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<p class="since">Since 2.8</p>
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<div class="refsect2">
<a name="gwy-grain-values-calculate"></a><h3>gwy_grain_values_calculate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_grain_values_calculate (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> nvalues</code></em>,
<em class="parameter"><code><a class="link" href="GwyGrainValue.html" title="GwyGrainValue"><span class="type">GwyGrainValue</span></a> **gvalues</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> **results</code></em>,
<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#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>);</pre>
<p>
Calculates a set of grain values.
</p>
<p>
See also <a class="link" href="libgwyprocess-grains.html#gwy-data-field-grains-get-quantities" title="gwy_data_field_grains_get_quantities ()"><code class="function">gwy_data_field_grains_get_quantities()</code></a> for a simplier function
for built-in grain values.
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<td><p><span class="term"><em class="parameter"><code>nvalues</code></em> :</span></p></td>
<td>Number of items in <em class="parameter"><code>gvalues</code></em>.</td>
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<td><p><span class="term"><em class="parameter"><code>gvalues</code></em> :</span></p></td>
<td>Array of grain value objects.</td>
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<td><p><span class="term"><em class="parameter"><code>results</code></em> :</span></p></td>
<td>Array of length <em class="parameter"><code>nvalues</code></em> of arrays of length <em class="parameter"><code>ngrains</code></em>+1 of doubles
to put the calculated values to.</td>
</tr>
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<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>Data field used for marking. For some values its values
are not used, but its dimensions determine the dimensions of
<em class="parameter"><code>grains</code></em>.</td>
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<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>
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<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>
</tbody>
</table></div>
<p class="since">Since 2.8</p>
</div>
</div>
</div>
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