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<title>ClutterZoomAction: Clutter Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
<a href="#ClutterZoomAction.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span>
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<a href="#ClutterZoomAction.signals" class="shortcut">Signals</a></span>
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<div class="refentry">
<a name="ClutterZoomAction"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="ClutterZoomAction.top_of_page"></a>ClutterZoomAction</span></h2>
<p>ClutterZoomAction — Action enabling zooming on actors</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="ClutterZoomAction.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">
<a class="link" href="ClutterAction.html" title="ClutterAction"><span class="returnvalue">ClutterAction</span></a> *
</td>
<td class="function_name">
<a class="link" href="ClutterZoomAction.html#clutter-zoom-action-new" title="clutter_zoom_action_new ()">clutter_zoom_action_new</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="ClutterZoomAction.html#clutter-zoom-action-set-zoom-axis" title="clutter_zoom_action_set_zoom_axis ()">clutter_zoom_action_set_zoom_axis</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="ClutterZoomAction.html#ClutterZoomAxis" title="enum ClutterZoomAxis"><span class="returnvalue">ClutterZoomAxis</span></a>
</td>
<td class="function_name">
<a class="link" href="ClutterZoomAction.html#clutter-zoom-action-get-zoom-axis" title="clutter_zoom_action_get_zoom_axis ()">clutter_zoom_action_get_zoom_axis</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="ClutterZoomAction.html#clutter-zoom-action-get-focal-point" title="clutter_zoom_action_get_focal_point ()">clutter_zoom_action_get_focal_point</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="ClutterZoomAction.html#clutter-zoom-action-get-transformed-focal-point" title="clutter_zoom_action_get_transformed_focal_point ()">clutter_zoom_action_get_transformed_focal_point</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody><tr>
<td class="property_type"><a class="link" href="ClutterZoomAction.html#ClutterZoomAxis" title="enum ClutterZoomAxis"><span class="type">ClutterZoomAxis</span></a></td>
<td class="property_name"><a class="link" href="ClutterZoomAction.html#ClutterZoomAction--zoom-axis" title="The “zoom-axis” property">zoom-axis</a></td>
<td class="property_flags">Read / Write</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.signals"></a><h2>Signals</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody><tr>
<td class="signal_type"><span class="returnvalue">gboolean</span></td>
<td class="signal_name"><a class="link" href="ClutterZoomAction.html#ClutterZoomAction-zoom" title="The “zoom” signal">zoom</a></td>
<td class="signal_flags">Run Last</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.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">struct</td>
<td class="function_name"><a class="link" href="ClutterZoomAction.html#ClutterZoomAction-struct" title="struct ClutterZoomAction">ClutterZoomAction</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="ClutterZoomAction.html#ClutterZoomActionClass" title="struct ClutterZoomActionClass">ClutterZoomActionClass</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="ClutterZoomAction.html#ClutterZoomAxis" title="enum ClutterZoomAxis">ClutterZoomAxis</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> GObject
<span class="lineart">╰──</span> GInitiallyUnowned
<span class="lineart">╰──</span> <a class="link" href="ClutterActorMeta.html" title="ClutterActorMeta">ClutterActorMeta</a>
<span class="lineart">╰──</span> <a class="link" href="ClutterAction.html" title="ClutterAction">ClutterAction</a>
<span class="lineart">╰──</span> <a class="link" href="ClutterGestureAction.html" title="ClutterGestureAction">ClutterGestureAction</a>
<span class="lineart">╰──</span> ClutterZoomAction
</pre>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.description"></a><h2>Description</h2>
<p><a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> is a sub-class of <a class="link" href="ClutterGestureAction.html" title="ClutterGestureAction"><span class="type">ClutterGestureAction</span></a> that
implements all the necessary logic for zooming actors using a "pinch"
gesture between two touch points.</p>
<p>The simplest usage of <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> consists in adding it to
a <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> and setting it as reactive; for instance, the following
code:</p>
<div class="informalexample"><pre class="programlisting">
clutter_actor_add_action (actor, clutter_zoom_action_new ());
clutter_actor_set_reactive (actor, TRUE);
</pre></div>
<p></p>
<p>will automatically result in the actor to be scale according to the
distance between two touch points.</p>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="clutter-zoom-action-new"></a><h3>clutter_zoom_action_new ()</h3>
<pre class="programlisting"><a class="link" href="ClutterAction.html" title="ClutterAction"><span class="returnvalue">ClutterAction</span></a> *
clutter_zoom_action_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a new <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> instance</p>
<div class="refsect3">
<a name="id-1.5.5.9.9.2.5"></a><h4>Returns</h4>
<p> the newly created <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a></p>
</div>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-zoom-action-set-zoom-axis"></a><h3>clutter_zoom_action_set_zoom_axis ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_zoom_action_set_zoom_axis (<em class="parameter"><code><a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> *action</code></em>,
<em class="parameter"><code><a class="link" href="ClutterZoomAction.html#ClutterZoomAxis" title="enum ClutterZoomAxis"><span class="type">ClutterZoomAxis</span></a> axis</code></em>);</pre>
<p>Restricts the zooming action to a specific axis</p>
<div class="refsect3">
<a name="id-1.5.5.9.9.3.5"></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>action</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>axis</p></td>
<td class="parameter_description"><p>the axis to constraint the zooming to</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-zoom-action-get-zoom-axis"></a><h3>clutter_zoom_action_get_zoom_axis ()</h3>
<pre class="programlisting"><a class="link" href="ClutterZoomAction.html#ClutterZoomAxis" title="enum ClutterZoomAxis"><span class="returnvalue">ClutterZoomAxis</span></a>
clutter_zoom_action_get_zoom_axis (<em class="parameter"><code><a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> *action</code></em>);</pre>
<p>Retrieves the axis constraint set by <a class="link" href="ClutterZoomAction.html#clutter-zoom-action-set-zoom-axis" title="clutter_zoom_action_set_zoom_axis ()"><code class="function">clutter_zoom_action_set_zoom_axis()</code></a></p>
<div class="refsect3">
<a name="id-1.5.5.9.9.4.5"></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>action</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.5.9.9.4.6"></a><h4>Returns</h4>
<p> the axis constraint</p>
</div>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-zoom-action-get-focal-point"></a><h3>clutter_zoom_action_get_focal_point ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_zoom_action_get_focal_point (<em class="parameter"><code><a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> *action</code></em>,
<em class="parameter"><code><a class="link" href="clutter-Base-geometric-types.html#ClutterPoint"><span class="type">ClutterPoint</span></a> *point</code></em>);</pre>
<p>Retrieves the focal point of the current zoom</p>
<div class="refsect3">
<a name="id-1.5.5.9.9.5.5"></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>action</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>point</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Base-geometric-types.html#ClutterPoint"><span class="type">ClutterPoint</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-zoom-action-get-transformed-focal-point"></a><h3>clutter_zoom_action_get_transformed_focal_point ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_zoom_action_get_transformed_focal_point
(<em class="parameter"><code><a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> *action</code></em>,
<em class="parameter"><code><a class="link" href="clutter-Base-geometric-types.html#ClutterPoint"><span class="type">ClutterPoint</span></a> *point</code></em>);</pre>
<p>Retrieves the focal point relative to the actor's coordinates of
the current zoom</p>
<div class="refsect3">
<a name="id-1.5.5.9.9.6.5"></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>action</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>point</p></td>
<td class="parameter_description"><p> a <a class="link" href="clutter-Base-geometric-types.html#ClutterPoint"><span class="type">ClutterPoint</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="ClutterZoomAction-struct"></a><h3>struct ClutterZoomAction</h3>
<pre class="programlisting">struct ClutterZoomAction;</pre>
<p>The <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> structure contains only
private data and should be accessed using the provided API</p>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterZoomActionClass"></a><h3>struct ClutterZoomActionClass</h3>
<pre class="programlisting">struct ClutterZoomActionClass {
gboolean (* zoom) (ClutterZoomAction *action,
ClutterActor *actor,
ClutterPoint *focal_point,
gdouble factor);
};
</pre>
<p>The <a class="link" href="ClutterZoomAction.html#ClutterZoomActionClass" title="struct ClutterZoomActionClass"><span class="type">ClutterZoomActionClass</span></a> structure contains
only private data</p>
<div class="refsect3">
<a name="id-1.5.5.9.10.3.5"></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><em class="structfield"><code><a name="ClutterZoomActionClass.zoom"></a>zoom</code></em> ()</p></td>
<td class="struct_member_description"><p>class handler of the <a class="link" href="ClutterZoomAction.html#ClutterZoomAction-zoom" title="The “zoom” signal"><span class="type">“zoom”</span></a> signal</p></td>
<td class="struct_member_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterZoomAxis"></a><h3>enum ClutterZoomAxis</h3>
<p>The axis of the constraint that should be applied by the
zooming action.</p>
<div class="refsect3">
<a name="id-1.5.5.9.10.4.4"></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-ZOOM-X-AXIS:CAPS"></a>CLUTTER_ZOOM_X_AXIS</p></td>
<td class="enum_member_description">
<p>Scale only on the X axis</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CLUTTER-ZOOM-Y-AXIS:CAPS"></a>CLUTTER_ZOOM_Y_AXIS</p></td>
<td class="enum_member_description">
<p>Scale only on the Y axis</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CLUTTER-ZOOM-BOTH:CAPS"></a>CLUTTER_ZOOM_BOTH</p></td>
<td class="enum_member_description">
<p>Scale on both axis</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="ClutterZoomAction--zoom-axis"></a><h3>The <code class="literal">“zoom-axis”</code> property</h3>
<pre class="programlisting"> “zoom-axis” <a class="link" href="ClutterZoomAction.html#ClutterZoomAxis" title="enum ClutterZoomAxis"><span class="type">ClutterZoomAxis</span></a></pre>
<p>Constraints the zooming action to the specified axis</p>
<p>Flags: Read / Write</p>
<p>Default value: CLUTTER_ZOOM_BOTH</p>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
</div>
<div class="refsect1">
<a name="ClutterZoomAction.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="ClutterZoomAction-zoom"></a><h3>The <code class="literal">“zoom”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
user_function (<a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> *action,
<a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *actor,
<a class="link" href="clutter-Base-geometric-types.html#ClutterPoint"><span class="type">ClutterPoint</span></a> *focal_point,
<span class="type">gdouble</span> factor,
<span class="type">gpointer</span> user_data)</pre>
<p>The ::zoom signal is emitted for each series of touch events that
change the distance and focal point between the touch points.</p>
<p>The default handler of the signal will call
<a class="link" href="ClutterActor.html#clutter-actor-set-scale" title="clutter_actor_set_scale ()"><code class="function">clutter_actor_set_scale()</code></a> on <em class="parameter"><code>actor</code></em>
using the ratio of the first
distance between the touch points and the current distance. To
override the default behaviour, connect to this signal and return
<code class="literal">FALSE</code>.</p>
<div class="refsect3">
<a name="id-1.5.5.9.12.2.6"></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>action</p></td>
<td class="parameter_description"><p>the <a class="link" href="ClutterZoomAction.html" title="ClutterZoomAction"><span class="type">ClutterZoomAction</span></a> that emitted the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>actor</p></td>
<td class="parameter_description"><p>the <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> attached to the action</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>focal_point</p></td>
<td class="parameter_description"><p>the focal point of the zoom</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>factor</p></td>
<td class="parameter_description"><p>the initial distance between the 2 touch points</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.5.9.12.2.7"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the zoom should continue, and <code class="literal">FALSE</code> if
the zoom should be cancelled.</p>
</div>
<p>Flags: Run Last</p>
<p class="since">Since: <a class="link" href="ix13.html#api-index-1.12">1.12</a></p>
</div>
</div>
</div>
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