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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Clutter Reference Manual: Unit conversion</title>
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<div class="refentry">
<a name="clutter-Unit-conversion"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="clutter-Unit-conversion.top_of_page"></a>Unit conversion</span></h2>
<p>Unit conversion — A logical distance unit</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="clutter-Unit-conversion.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-from-cm" title="clutter_units_from_cm ()">clutter_units_from_cm</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-from-em" title="clutter_units_from_em ()">clutter_units_from_em</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-from-em-for-font" title="clutter_units_from_em_for_font ()">clutter_units_from_em_for_font</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-from-mm" title="clutter_units_from_mm ()">clutter_units_from_mm</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-from-pixels" title="clutter_units_from_pixels ()">clutter_units_from_pixels</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-from-pt" title="clutter_units_from_pt ()">clutter_units_from_pt</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gfloat</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-to-pixels" title="clutter_units_to_pixels ()">clutter_units_to_pixels</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="returnvalue">ClutterUnits</span></a> *
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-copy" title="clutter_units_copy ()">clutter_units_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-free" title="clutter_units_free ()">clutter_units_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="clutter-Unit-conversion.html#ClutterUnitType" title="enum ClutterUnitType"><span class="returnvalue">ClutterUnitType</span></a>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-get-unit-type" title="clutter_units_get_unit_type ()">clutter_units_get_unit_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gfloat</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-get-unit-value" title="clutter_units_get_unit_value ()">clutter_units_get_unit_value</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-from-string" title="clutter_units_from_string ()">clutter_units_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-units-to-string" title="clutter_units_to_string ()">clutter_units_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GParamSpec</span> *
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-param-spec-units" title="clutter_param_spec_units ()">clutter_param_spec_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#CLUTTER-VALUE-HOLDS-UNITS:CAPS" title="CLUTTER_VALUE_HOLDS_UNITS()">CLUTTER_VALUE_HOLDS_UNITS</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-value-set-units" title="clutter_value_set_units ()">clutter_value_set_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="returnvalue">ClutterUnits</span></a> *
</td>
<td class="function_name">
<a class="link" href="clutter-Unit-conversion.html#clutter-value-get-units" title="clutter_value_get_units ()">clutter_value_get_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="clutter-Unit-conversion.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="clutter-Unit-conversion.html#ClutterUnitType" title="enum ClutterUnitType">ClutterUnitType</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits">ClutterUnits</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="clutter-Unit-conversion.html#ClutterParamSpecUnits" title="struct ClutterParamSpecUnits">ClutterParamSpecUnits</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="clutter-Unit-conversion.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="clutter-Unit-conversion.description"></a><h2>Description</h2>
<p><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> is a structure holding a logical distance value along with
its type, expressed as a value of the <a class="link" href="clutter-Unit-conversion.html#ClutterUnitType" title="enum ClutterUnitType"><span class="type">ClutterUnitType</span></a> enumeration. It is
possible to use <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> to store a position or a size in units
different than pixels, and convert them whenever needed (for instance
inside the <a class="link" href="ClutterActor.html#ClutterActorClass.allocate"><code class="function">ClutterActorClass.allocate()</code></a> virtual function, or inside the
<a class="link" href="ClutterActor.html#ClutterActorClass.get-preferred-width"><code class="function">ClutterActorClass.get_preferred_width()</code></a> and <a class="link" href="ClutterActor.html#ClutterActorClass.get-preferred-height"><code class="function">ClutterActorClass.get_preferred_height()</code></a>
virtual functions.</p>
<p>In order to register a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> property, the <a class="link" href="clutter-Unit-conversion.html#ClutterParamSpecUnits" title="struct ClutterParamSpecUnits"><span class="type">ClutterParamSpecUnits</span></a>
<span class="type">GParamSpec</span> sub-class should be used:</p>
<div class="informalexample"><pre class="programlisting">
  GParamSpec *pspec;

  pspec = clutter_param_spec_units ("active-width",
                                    "Width",
                                    "Width of the active area, in millimeters",
                                    CLUTTER_UNIT_MM,
                                    0.0, 12.0,
                                    12.0,
                                    G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_WIDTH, pspec);
</pre></div>
<p></p>
<p>A <span class="type">GValue</span> holding units can be manipulated using <a class="link" href="clutter-Unit-conversion.html#clutter-value-set-units" title="clutter_value_set_units ()"><code class="function">clutter_value_set_units()</code></a>
and <a class="link" href="clutter-Unit-conversion.html#clutter-value-get-units" title="clutter_value_get_units ()"><code class="function">clutter_value_get_units()</code></a>. <span class="type">GValue</span>s containing a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>
value can also be transformed to <span class="type">GValue</span>s initialized with
<code class="literal">G_TYPE_INT</code>, <code class="literal">G_TYPE_FLOAT</code> and <code class="literal">G_TYPE_STRING</code> through implicit conversion
and using <code class="function">g_value_transform()</code>.</p>
<p><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> is available since Clutter 1.0</p>
</div>
<div class="refsect1">
<a name="clutter-Unit-conversion.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="clutter-units-from-cm"></a><h3>clutter_units_from_cm ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_units_from_cm (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>,
                       <em class="parameter"><code><span class="type">gfloat</span> cm</code></em>);</pre>
<p>Stores a value in centimeters inside <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>cm</p></td>
<td class="parameter_description"><p>centimeters</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-from-em"></a><h3>clutter_units_from_em ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_units_from_em (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>,
                       <em class="parameter"><code><span class="type">gfloat</span> em</code></em>);</pre>
<p>Stores a value in em inside <em class="parameter"><code>units</code></em>
, using the default font
name as returned by <a class="link" href="ClutterBackend.html#clutter-backend-get-font-name" title="clutter_backend_get_font_name ()"><code class="function">clutter_backend_get_font_name()</code></a></p>
<div class="refsect3">
<a name="id-1.7.2.14.7.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>em</p></td>
<td class="parameter_description"><p>em</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-from-em-for-font"></a><h3>clutter_units_from_em_for_font ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_units_from_em_for_font (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>,
                                <em class="parameter"><code>const <span class="type">gchar</span> *font_name</code></em>,
                                <em class="parameter"><code><span class="type">gfloat</span> em</code></em>);</pre>
<p>Stores a value in em inside <em class="parameter"><code>units</code></em>
 using <em class="parameter"><code>font_name</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>font_name</p></td>
<td class="parameter_description"><p> the font name and size. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>em</p></td>
<td class="parameter_description"><p>em</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-from-mm"></a><h3>clutter_units_from_mm ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_units_from_mm (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>,
                       <em class="parameter"><code><span class="type">gfloat</span> mm</code></em>);</pre>
<p>Stores a value in millimiters inside <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>mm</p></td>
<td class="parameter_description"><p>millimeters</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-from-pixels"></a><h3>clutter_units_from_pixels ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_units_from_pixels (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>,
                           <em class="parameter"><code><span class="type">gint</span> px</code></em>);</pre>
<p>Stores a value in pixels inside <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>px</p></td>
<td class="parameter_description"><p>pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-from-pt"></a><h3>clutter_units_from_pt ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_units_from_pt (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>,
                       <em class="parameter"><code><span class="type">gfloat</span> pt</code></em>);</pre>
<p>Stores a value in typographic points inside <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>pt</p></td>
<td class="parameter_description"><p>typographic points</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-to-pixels"></a><h3>clutter_units_to_pixels ()</h3>
<pre class="programlisting"><span class="returnvalue">gfloat</span>
clutter_units_to_pixels (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>);</pre>
<p>Converts a value in <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> to pixels</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p>units to convert</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.8.6"></a><h4>Returns</h4>
<p> the value in pixels</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-copy"></a><h3>clutter_units_copy ()</h3>
<pre class="programlisting"><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="returnvalue">ClutterUnits</span></a> *
clutter_units_copy (<em class="parameter"><code>const <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>);</pre>
<p>Copies <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p>the <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> to copy</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.9.6"></a><h4>Returns</h4>
<p> the newly created copy of a
<a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> structure. Use <a class="link" href="clutter-Unit-conversion.html#clutter-units-free" title="clutter_units_free ()"><code class="function">clutter_units_free()</code></a> to free
the allocated resources. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-free"></a><h3>clutter_units_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_units_free (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>);</pre>
<p>Frees the resources allocated by <em class="parameter"><code>units</code></em>
</p>
<p>You should only call this function on a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>
created using <a class="link" href="clutter-Unit-conversion.html#clutter-units-copy" title="clutter_units_copy ()"><code class="function">clutter_units_copy()</code></a></p>
<div class="refsect3">
<a name="id-1.7.2.14.7.10.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p>the <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> to free</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-get-unit-type"></a><h3>clutter_units_get_unit_type ()</h3>
<pre class="programlisting"><a class="link" href="clutter-Unit-conversion.html#ClutterUnitType" title="enum ClutterUnitType"><span class="returnvalue">ClutterUnitType</span></a>
clutter_units_get_unit_type (<em class="parameter"><code>const <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>);</pre>
<p>Retrieves the unit type of the value stored inside <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.11.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.11.6"></a><h4>Returns</h4>
<p> a unit type</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-get-unit-value"></a><h3>clutter_units_get_unit_value ()</h3>
<pre class="programlisting"><span class="returnvalue">gfloat</span>
clutter_units_get_unit_value (<em class="parameter"><code>const <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>);</pre>
<p>Retrieves the value stored inside <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.12.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.12.6"></a><h4>Returns</h4>
<p> the value stored inside a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a></p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-from-string"></a><h3>clutter_units_from_string ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
clutter_units_from_string (<em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>,
                           <em class="parameter"><code>const <span class="type">gchar</span> *str</code></em>);</pre>
<p>Parses a value and updates <em class="parameter"><code>units</code></em>
 with it</p>
<p>A <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> expressed in string should match:</p>
<div class="informalexample"><pre class="programlisting">
  units: wsp* unit-value wsp* unit-name? wsp*
  unit-value: number
  unit-name: 'px' | 'pt' | 'mm' | 'em' | 'cm'
  number: digit+
          | digit* sep digit+
  sep: '.' | ','
  digit: '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
  wsp: (#0x20 | #0x9 | #0xA | #0xB | #0xC | #0xD)+
</pre></div>
<p></p>
<p>For instance, these are valid strings:</p>
<div class="informalexample"><pre class="programlisting">
  10 px
  5.1 em
  24 pt
  12.6 mm
  .3 cm
</pre></div>
<p></p>
<p>While these are not:</p>
<div class="informalexample"><pre class="programlisting">
  42 cats
  omg!1!ponies
</pre></div>
<p></p>
<div class="note"><p>If no unit is specified, pixels are assumed.</p></div>
<div class="refsect3">
<a name="id-1.7.2.14.7.13.15"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>str</p></td>
<td class="parameter_description"><p>the string to convert</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.13.16"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the string was successfully parsed,
and <code class="literal">FALSE</code> otherwise</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-units-to-string"></a><h3>clutter_units_to_string ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *
clutter_units_to_string (<em class="parameter"><code>const <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>);</pre>
<p>Converts <em class="parameter"><code>units</code></em>
 into a string</p>
<p>See <a class="link" href="clutter-Unit-conversion.html#clutter-units-from-string" title="clutter_units_from_string ()"><code class="function">clutter_units_from_string()</code></a> for the units syntax and for
examples of output</p>
<div class="note">Fractional values are truncated to the second decimal
position for em, mm and cm, and to the first decimal position for
typographic points. Pixels are integers.</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.14.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.14.8"></a><h4>Returns</h4>
<p> a newly allocated string containing the encoded
<a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> value. Use <code class="function">g_free()</code> to free the string</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-param-spec-units"></a><h3>clutter_param_spec_units ()</h3>
<pre class="programlisting"><span class="returnvalue">GParamSpec</span> *
clutter_param_spec_units (<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>,
                          <em class="parameter"><code>const <span class="type">gchar</span> *nick</code></em>,
                          <em class="parameter"><code>const <span class="type">gchar</span> *blurb</code></em>,
                          <em class="parameter"><code><a class="link" href="clutter-Unit-conversion.html#ClutterUnitType" title="enum ClutterUnitType"><span class="type">ClutterUnitType</span></a> default_type</code></em>,
                          <em class="parameter"><code><span class="type">gfloat</span> minimum</code></em>,
                          <em class="parameter"><code><span class="type">gfloat</span> maximum</code></em>,
                          <em class="parameter"><code><span class="type">gfloat</span> default_value</code></em>,
                          <em class="parameter"><code><span class="type">GParamFlags</span> flags</code></em>);</pre>
<p>Creates a <span class="type">GParamSpec</span> for properties using <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a>.</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.15.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>name of the property</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nick</p></td>
<td class="parameter_description"><p>short name</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>blurb</p></td>
<td class="parameter_description"><p>description (can be translatable)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>default_type</p></td>
<td class="parameter_description"><p>the default type for the <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>minimum</p></td>
<td class="parameter_description"><p>lower boundary</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>maximum</p></td>
<td class="parameter_description"><p>higher boundary</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>default_value</p></td>
<td class="parameter_description"><p>default value</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>flags</p></td>
<td class="parameter_description"><p>flags for the param spec</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.15.6"></a><h4>Returns</h4>
<p> the newly created <span class="type">GParamSpec</span></p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="CLUTTER-VALUE-HOLDS-UNITS:CAPS"></a><h3>CLUTTER_VALUE_HOLDS_UNITS()</h3>
<pre class="programlisting">#define CLUTTER_VALUE_HOLDS_UNITS(x)    (G_VALUE_HOLDS ((x), CLUTTER_TYPE_UNITS))
</pre>
<p>Evaluates to <code class="literal">TRUE</code> if <em class="parameter"><code>x</code></em>
 holds a <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> value</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.16.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>a <span class="type">GValue</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since 0.8</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-value-set-units"></a><h3>clutter_value_set_units ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_value_set_units (<em class="parameter"><code><span class="type">GValue</span> *value</code></em>,
                         <em class="parameter"><code>const <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> *units</code></em>);</pre>
<p>Sets <em class="parameter"><code>value</code></em>
 to <em class="parameter"><code>units</code></em>
</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.17.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <span class="type">GValue</span> initialized to <code class="literal">CLUTTER_TYPE_UNITS</code></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>units</p></td>
<td class="parameter_description"><p>the units to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 0.8</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-value-get-units"></a><h3>clutter_value_get_units ()</h3>
<pre class="programlisting">const <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="returnvalue">ClutterUnits</span></a> *
clutter_value_get_units (<em class="parameter"><code>const <span class="type">GValue</span> *value</code></em>);</pre>
<p>Gets the <a class="link" href="clutter-Unit-conversion.html#ClutterUnits" title="struct ClutterUnits"><span class="type">ClutterUnits</span></a> contained in <em class="parameter"><code>value</code></em>
.</p>
<div class="refsect3">
<a name="id-1.7.2.14.7.18.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <span class="type">GValue</span> initialized to <code class="literal">CLUTTER_TYPE_UNITS</code></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.2.14.7.18.6"></a><h4>Returns</h4>
<p> the units inside the passed <span class="type">GValue</span></p>
<p></p>
</div>
<p class="since">Since 0.8</p>
</div>
</div>
<div class="refsect1">
<a name="clutter-Unit-conversion.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="ClutterUnitType"></a><h3>enum ClutterUnitType</h3>
<p>The type of unit in which a value is expressed</p>
<p>This enumeration might be expanded at later date</p>
<div class="refsect3">
<a name="id-1.7.2.14.8.2.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CLUTTER-UNIT-PIXEL:CAPS"></a>CLUTTER_UNIT_PIXEL</p></td>
<td class="enum_member_description">
<p>Unit expressed in pixels (with subpixel precision)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CLUTTER-UNIT-EM:CAPS"></a>CLUTTER_UNIT_EM</p></td>
<td class="enum_member_description">
<p>Unit expressed in em</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CLUTTER-UNIT-MM:CAPS"></a>CLUTTER_UNIT_MM</p></td>
<td class="enum_member_description">
<p>Unit expressed in millimeters</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CLUTTER-UNIT-POINT:CAPS"></a>CLUTTER_UNIT_POINT</p></td>
<td class="enum_member_description">
<p>Unit expressed in points</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CLUTTER-UNIT-CM:CAPS"></a>CLUTTER_UNIT_CM</p></td>
<td class="enum_member_description">
<p>Unit expressed in centimeters</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterUnits"></a><h3>struct ClutterUnits</h3>
<pre class="programlisting">struct ClutterUnits {
};
</pre>
<p>An opaque structure, to be used to store sizing and positioning
values along with their unit.</p>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterParamSpecUnits"></a><h3>struct ClutterParamSpecUnits</h3>
<pre class="programlisting">struct ClutterParamSpecUnits {
  ClutterUnitType default_type;

  gfloat default_value;
  gfloat minimum;
  gfloat maximum;
};
</pre>
<p><span class="type">GParamSpec</span> subclass for unit based properties.</p>
<div class="refsect3">
<a name="id-1.7.2.14.8.4.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a class="link" href="clutter-Unit-conversion.html#ClutterUnitType" title="enum ClutterUnitType"><span class="type">ClutterUnitType</span></a> <em class="structfield"><code><a name="ClutterParamSpecUnits.default-type"></a>default_type</code></em>;</p></td>
<td class="struct_member_description"><p>default type</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">gfloat</span> <em class="structfield"><code><a name="ClutterParamSpecUnits.default-value"></a>default_value</code></em>;</p></td>
<td class="struct_member_description"><p>default value</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">gfloat</span> <em class="structfield"><code><a name="ClutterParamSpecUnits.minimum"></a>minimum</code></em>;</p></td>
<td class="struct_member_description"><p>lower boundary</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">gfloat</span> <em class="structfield"><code><a name="ClutterParamSpecUnits.maximum"></a>maximum</code></em>;</p></td>
<td class="struct_member_description"><p>higher boundary</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
</div>
</div>
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