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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Value intervals: Clutter Reference Manual</title>
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<a name="clutter-Value-intervals"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="clutter-Value-intervals.top_of_page"></a>Value intervals</span></h2>
<p>Value intervals — An object holding an interval of two values</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="clutter-Value-intervals.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" 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="clutter-Value-intervals.html#ClutterInterval"><span class="returnvalue">ClutterInterval</span></a> *
</td>
<td class="function_name">
<a class="link" href="clutter-Value-intervals.html#clutter-interval-new" title="clutter_interval_new ()">clutter_interval_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="returnvalue">ClutterInterval</span></a> *
</td>
<td class="function_name">
<a class="link" href="clutter-Value-intervals.html#clutter-interval-new-with-values" title="clutter_interval_new_with_values ()">clutter_interval_new_with_values</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="returnvalue">ClutterInterval</span></a> *
</td>
<td class="function_name">
<a class="link" href="clutter-Value-intervals.html#clutter-interval-clone" title="clutter_interval_clone ()">clutter_interval_clone</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GType</span>
</td>
<td class="function_name">
<a class="link" href="clutter-Value-intervals.html#clutter-interval-get-value-type" title="clutter_interval_get_value_type ()">clutter_interval_get_value_type</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-Value-intervals.html#clutter-interval-set-initial-value" title="clutter_interval_set_initial_value ()">clutter_interval_set_initial_value</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-Value-intervals.html#clutter-interval-get-initial-value" title="clutter_interval_get_initial_value ()">clutter_interval_get_initial_value</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GValue</span> *
</td>
<td class="function_name">
<a class="link" href="clutter-Value-intervals.html#clutter-interval-peek-initial-value" title="clutter_interval_peek_initial_value ()">clutter_interval_peek_initial_value</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-Value-intervals.html#clutter-interval-set-final-value" title="clutter_interval_set_final_value ()">clutter_interval_set_final_value</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-Value-intervals.html#clutter-interval-get-final-value" title="clutter_interval_get_final_value ()">clutter_interval_get_final_value</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GValue</span> *
</td>
<td class="function_name">
<a class="link" href="clutter-Value-intervals.html#clutter-interval-peek-final-value" title="clutter_interval_peek_final_value ()">clutter_interval_peek_final_value</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-Value-intervals.html#clutter-interval-set-interval" title="clutter_interval_set_interval ()">clutter_interval_set_interval</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-Value-intervals.html#clutter-interval-get-interval" title="clutter_interval_get_interval ()">clutter_interval_get_interval</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-Value-intervals.html#clutter-interval-set-initial" title="clutter_interval_set_initial ()">clutter_interval_set_initial</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-Value-intervals.html#clutter-interval-set-final" title="clutter_interval_set_final ()">clutter_interval_set_final</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-Value-intervals.html#clutter-interval-is-valid" title="clutter_interval_is_valid ()">clutter_interval_is_valid</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-Value-intervals.html#clutter-interval-validate" title="clutter_interval_validate ()">clutter_interval_validate</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-Value-intervals.html#clutter-interval-compute-value" title="clutter_interval_compute_value ()">clutter_interval_compute_value</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">GValue</span> *
</td>
<td class="function_name">
<a class="link" href="clutter-Value-intervals.html#clutter-interval-compute" title="clutter_interval_compute ()">clutter_interval_compute</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="clutter-Value-intervals.html#ClutterProgressFunc" title="ClutterProgressFunc ()">*ClutterProgressFunc</a><span class="c_punctuation">)</span> <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-Value-intervals.html#clutter-interval-register-progress-func" title="clutter_interval_register_progress_func ()">clutter_interval_register_progress_func</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="clutter-Value-intervals.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" 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">
<span class="type">GValue</span> *</td>
<td class="property_name"><a class="link" href="clutter-Value-intervals.html#ClutterInterval--final" title="The “final” property">final</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<span class="type">GValue</span> *</td>
<td class="property_name"><a class="link" href="clutter-Value-intervals.html#ClutterInterval--initial" title="The “initial” property">initial</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<span class="type">GType</span> *</td>
<td class="property_name"><a class="link" href="clutter-Value-intervals.html#ClutterInterval--value-type" title="The “value-type” property">value-type</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
</tbody>
</table></div>
</div>
<a name="ClutterInterval"></a><div class="refsect1">
<a name="clutter-Value-intervals.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="clutter-Value-intervals.html#ClutterInterval-struct" title="ClutterInterval">ClutterInterval</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="clutter-Value-intervals.html#ClutterIntervalClass" title="struct ClutterIntervalClass">ClutterIntervalClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="clutter-Value-intervals.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> GObject
<span class="lineart">╰──</span> GInitiallyUnowned
<span class="lineart">╰──</span> ClutterInterval
</pre>
</div>
<div class="refsect1">
<a name="clutter-Value-intervals.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
ClutterInterval implements
<a class="link" href="ClutterScriptable.html" title="ClutterScriptable">ClutterScriptable</a>.</p>
</div>
<div class="refsect1">
<a name="clutter-Value-intervals.description"></a><h2>Description</h2>
<p><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> is a simple object that can hold two values
defining an interval. <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> can hold any value that
can be enclosed inside a <span class="type">GValue</span>.</p>
<p>Once a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> for a specific <span class="type">GType</span> has been instantiated
the <a class="link" href="clutter-Value-intervals.html#ClutterInterval--value-type" title="The “value-type” property"><span class="type">“value-type”</span></a> property cannot be changed anymore.</p>
<p><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> starts with a floating reference; this means that
any object taking a reference on a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> instance should
also take ownership of the interval by using <code class="function">g_object_ref_sink()</code>.</p>
<p><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> is used by <a class="link" href="clutter-Implicit-Animations.html#ClutterAnimation"><span class="type">ClutterAnimation</span></a> to define the
interval of values that an implicit animation should tween over.</p>
<p><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> can be subclassed to override the validation
and value computation.</p>
<p><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> is available since Clutter 1.0</p>
</div>
<div class="refsect1">
<a name="clutter-Value-intervals.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="clutter-interval-new"></a><h3>clutter_interval_new ()</h3>
<pre class="programlisting"><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="returnvalue">ClutterInterval</span></a> *
clutter_interval_new (<em class="parameter"><code><span class="type">GType</span> gtype</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Creates a new <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> holding values of type <em class="parameter"><code>gtype</code></em>
.</p>
<p>This function avoids using a <span class="type">GValue</span> for the initial and final values
of the interval:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="normal">interval </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="clutter-Value-intervals.html#clutter-interval-new">clutter_interval_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">G_TYPE_FLOAT</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0.0</span><span class="symbol">,</span><span class="normal"> </span><span class="number">1.0</span><span class="symbol">);</span>
<span class="normal">interval </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="clutter-Value-intervals.html#clutter-interval-new">clutter_interval_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">G_TYPE_BOOLEAN</span><span class="symbol">,</span><span class="normal"> FALSE</span><span class="symbol">,</span><span class="normal"> TRUE</span><span class="symbol">);</span>
<span class="normal">interval </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="clutter-Value-intervals.html#clutter-interval-new">clutter_interval_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">G_TYPE_INT</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> </span><span class="number">360</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<div class="refsect3">
<a name="clutter-interval-new.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>gtype</p></td>
<td class="parameter_description"><p>the type of the values in the interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>the initial value and the final value of the interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-new.returns"></a><h4>Returns</h4>
<p> the newly created <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-new-with-values"></a><h3>clutter_interval_new_with_values ()</h3>
<pre class="programlisting"><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="returnvalue">ClutterInterval</span></a> *
clutter_interval_new_with_values (<em class="parameter"><code><span class="type">GType</span> gtype</code></em>,
<em class="parameter"><code>const <span class="type">GValue</span> *initial</code></em>,
<em class="parameter"><code>const <span class="type">GValue</span> *final</code></em>);</pre>
<p>Creates a new <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> of type <em class="parameter"><code>gtype</code></em>
, between <em class="parameter"><code>initial</code></em>
and <em class="parameter"><code>final</code></em>
.</p>
<p>This function is useful for language bindings.</p>
<div class="refsect3">
<a name="clutter-interval-new-with-values.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>gtype</p></td>
<td class="parameter_description"><p>the type of the values in the interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>initial</p></td>
<td class="parameter_description"><p>a <span class="type">GValue</span> holding the initial value of the interval. </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>final</p></td>
<td class="parameter_description"><p>a <span class="type">GValue</span> holding the final value of the interval. </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>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-new-with-values.returns"></a><h4>Returns</h4>
<p> the newly created <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-clone"></a><h3>clutter_interval_clone ()</h3>
<pre class="programlisting"><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="returnvalue">ClutterInterval</span></a> *
clutter_interval_clone (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>);</pre>
<p>Creates a copy of <em class="parameter"><code>interval</code></em>
.</p>
<div class="refsect3">
<a name="clutter-interval-clone.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-clone.returns"></a><h4>Returns</h4>
<p>the newly created <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a>. </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: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-get-value-type"></a><h3>clutter_interval_get_value_type ()</h3>
<pre class="programlisting"><span class="returnvalue">GType</span>
clutter_interval_get_value_type (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>);</pre>
<p>Retrieves the <span class="type">GType</span> of the values inside <em class="parameter"><code>interval</code></em>
.</p>
<div class="refsect3">
<a name="clutter-interval-get-value-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-get-value-type.returns"></a><h4>Returns</h4>
<p> the type of the value, or G_TYPE_INVALID</p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-set-initial-value"></a><h3>clutter_interval_set_initial_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_set_initial_value (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code>const <span class="type">GValue</span> *value</code></em>);</pre>
<p>Sets the initial value of <em class="parameter"><code>interval</code></em>
to <em class="parameter"><code>value</code></em>
. The value is copied
inside the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a>.</p>
<p><span class="annotation">[<acronym title="Rename the original symbol's name to SYMBOL."><span class="acronym">rename-to</span></acronym> clutter_interval_set_initial]</span></p>
<div class="refsect3">
<a name="clutter-interval-set-initial-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</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: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-get-initial-value"></a><h3>clutter_interval_get_initial_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_get_initial_value (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code><span class="type">GValue</span> *value</code></em>);</pre>
<p>Retrieves the initial value of <em class="parameter"><code>interval</code></em>
and copies
it into <em class="parameter"><code>value</code></em>
.</p>
<p>The passed <span class="type">GValue</span> must be initialized to the value held by
the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a>.</p>
<div class="refsect3">
<a name="clutter-interval-get-initial-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <span class="type">GValue</span>. </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>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-peek-initial-value"></a><h3>clutter_interval_peek_initial_value ()</h3>
<pre class="programlisting"><span class="returnvalue">GValue</span> *
clutter_interval_peek_initial_value (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>);</pre>
<p>Gets the pointer to the initial value of <em class="parameter"><code>interval</code></em>
</p>
<div class="refsect3">
<a name="clutter-interval-peek-initial-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-peek-initial-value.returns"></a><h4>Returns</h4>
<p>the initial value of the interval.
The value is owned by the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> and it should not be
modified or freed. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-set-final-value"></a><h3>clutter_interval_set_final_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_set_final_value (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code>const <span class="type">GValue</span> *value</code></em>);</pre>
<p>Sets the final value of <em class="parameter"><code>interval</code></em>
to <em class="parameter"><code>value</code></em>
. The value is
copied inside the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a>.</p>
<p><span class="annotation">[<acronym title="Rename the original symbol's name to SYMBOL."><span class="acronym">rename-to</span></acronym> clutter_interval_set_final]</span></p>
<div class="refsect3">
<a name="clutter-interval-set-final-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</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: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-get-final-value"></a><h3>clutter_interval_get_final_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_get_final_value (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code><span class="type">GValue</span> *value</code></em>);</pre>
<p>Retrieves the final value of <em class="parameter"><code>interval</code></em>
and copies
it into <em class="parameter"><code>value</code></em>
.</p>
<p>The passed <span class="type">GValue</span> must be initialized to the value held by
the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a>.</p>
<div class="refsect3">
<a name="clutter-interval-get-final-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>a <span class="type">GValue</span>. </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>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-peek-final-value"></a><h3>clutter_interval_peek_final_value ()</h3>
<pre class="programlisting"><span class="returnvalue">GValue</span> *
clutter_interval_peek_final_value (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>);</pre>
<p>Gets the pointer to the final value of <em class="parameter"><code>interval</code></em>
</p>
<div class="refsect3">
<a name="clutter-interval-peek-final-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-peek-final-value.returns"></a><h4>Returns</h4>
<p>the final value of the interval.
The value is owned by the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> and it should not be
modified or freed. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-set-interval"></a><h3>clutter_interval_set_interval ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_set_interval (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Variable arguments wrapper for <a class="link" href="clutter-Value-intervals.html#clutter-interval-set-initial-value" title="clutter_interval_set_initial_value ()"><code class="function">clutter_interval_set_initial_value()</code></a>
and <a class="link" href="clutter-Value-intervals.html#clutter-interval-set-final-value" title="clutter_interval_set_final_value ()"><code class="function">clutter_interval_set_final_value()</code></a> that avoids using the
<span class="type">GValue</span> arguments:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="clutter-Value-intervals.html#clutter-interval-set-interval">clutter_interval_set_interval</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">interval</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> </span><span class="number">50</span><span class="symbol">);</span>
<span class="function"><a href="clutter-Value-intervals.html#clutter-interval-set-interval">clutter_interval_set_interval</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">interval</span><span class="symbol">,</span><span class="normal"> </span><span class="number">1.0</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0.0</span><span class="symbol">);</span>
<span class="function"><a href="clutter-Value-intervals.html#clutter-interval-set-interval">clutter_interval_set_interval</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">interval</span><span class="symbol">,</span><span class="normal"> FALSE</span><span class="symbol">,</span><span class="normal"> TRUE</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<p>This function is meant for the convenience of the C API; bindings
should reimplement this function using the <span class="type">GValue-based</span> API.</p>
<div class="refsect3">
<a name="clutter-interval-set-interval.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>the initial and final values of the interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-get-interval"></a><h3>clutter_interval_get_interval ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_get_interval (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Variable arguments wrapper for <a class="link" href="clutter-Value-intervals.html#clutter-interval-get-initial-value" title="clutter_interval_get_initial_value ()"><code class="function">clutter_interval_get_initial_value()</code></a>
and <a class="link" href="clutter-Value-intervals.html#clutter-interval-get-final-value" title="clutter_interval_get_final_value ()"><code class="function">clutter_interval_get_final_value()</code></a> that avoids using the
<span class="type">GValue</span> arguments:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">gint</span><span class="normal"> a </span><span class="symbol">=</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> b </span><span class="symbol">=</span><span class="normal"> </span><span class="number">0</span><span class="symbol">;</span>
<span class="function"><a href="clutter-Value-intervals.html#clutter-interval-get-interval">clutter_interval_get_interval</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">interval</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">a</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">b</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<p>This function is meant for the convenience of the C API; bindings
should reimplement this function using the <span class="type">GValue-based</span> API.</p>
<div class="refsect3">
<a name="clutter-interval-get-interval.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>return locations for the initial and final values of
the interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-set-initial"></a><h3>clutter_interval_set_initial ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_set_initial (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Variadic arguments version of <a class="link" href="clutter-Value-intervals.html#clutter-interval-set-initial-value" title="clutter_interval_set_initial_value ()"><code class="function">clutter_interval_set_initial_value()</code></a>.</p>
<p>This function is meant as a convenience for the C API.</p>
<p>Language bindings should use <a class="link" href="clutter-Value-intervals.html#clutter-interval-set-initial-value" title="clutter_interval_set_initial_value ()"><code class="function">clutter_interval_set_initial_value()</code></a>
instead.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="clutter-interval-set-initial.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>the initial value of the interval.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix12.html#api-index-1.10">1.10</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-set-final"></a><h3>clutter_interval_set_final ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_set_final (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Variadic arguments version of <a class="link" href="clutter-Value-intervals.html#clutter-interval-set-final-value" title="clutter_interval_set_final_value ()"><code class="function">clutter_interval_set_final_value()</code></a>.</p>
<p>This function is meant as a convenience for the C API.</p>
<p>Language bindings should use <a class="link" href="clutter-Value-intervals.html#clutter-interval-set-final-value" title="clutter_interval_set_final_value ()"><code class="function">clutter_interval_set_final_value()</code></a> instead.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="clutter-interval-set-final.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>the final value of the interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix12.html#api-index-1.10">1.10</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-is-valid"></a><h3>clutter_interval_is_valid ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
clutter_interval_is_valid (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>);</pre>
<p>Checks if the <em class="parameter"><code>interval</code></em>
has a valid initial and final values.</p>
<div class="refsect3">
<a name="clutter-interval-is-valid.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-is-valid.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> has an initial and
final values, and <code class="literal">FALSE</code> otherwise</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-interval-validate"></a><h3>clutter_interval_validate ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
clutter_interval_validate (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>);</pre>
<p>Validates the initial and final values of <em class="parameter"><code>interval</code></em>
against
a <span class="type">GParamSpec</span>.</p>
<div class="refsect3">
<a name="clutter-interval-validate.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pspec</p></td>
<td class="parameter_description"><p>a <span class="type">GParamSpec</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-validate.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> is valid, <code class="literal">FALSE</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-compute-value"></a><h3>clutter_interval_compute_value ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
clutter_interval_compute_value (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> factor</code></em>,
<em class="parameter"><code><span class="type">GValue</span> *value</code></em>);</pre>
<p>Computes the value between the <em class="parameter"><code>interval</code></em>
boundaries given the
progress <em class="parameter"><code>factor</code></em>
and copies it into <em class="parameter"><code>value</code></em>
.</p>
<div class="refsect3">
<a name="clutter-interval-compute-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>factor</p></td>
<td class="parameter_description"><p>the progress factor, between 0 and 1</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>return location for an initialized <span class="type">GValue</span>. </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>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-compute-value.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the operation was successful</p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-compute"></a><h3>clutter_interval_compute ()</h3>
<pre class="programlisting">const <span class="returnvalue">GValue</span> *
clutter_interval_compute (<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> *interval</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> factor</code></em>);</pre>
<p>Computes the value between the <em class="parameter"><code>interval</code></em>
boundaries given the
progress <em class="parameter"><code>factor</code></em>
</p>
<p>Unlike <a class="link" href="clutter-Value-intervals.html#clutter-interval-compute-value" title="clutter_interval_compute_value ()"><code class="function">clutter_interval_compute_value()</code></a>, this function will
return a const pointer to the computed value</p>
<p>You should use this function if you immediately pass the computed
value to another function that makes a copy of it, like
<code class="function">g_object_set_property()</code></p>
<div class="refsect3">
<a name="clutter-interval-compute.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>interval</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>factor</p></td>
<td class="parameter_description"><p>the progress factor, between 0 and 1</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="clutter-interval-compute.returns"></a><h4>Returns</h4>
<p>a pointer to the computed value,
or <code class="literal">NULL</code> if the computation was not successfull. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix09.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterProgressFunc"></a><h3>ClutterProgressFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
<span class="c_punctuation">(</span>*ClutterProgressFunc<span class="c_punctuation">)</span> (<em class="parameter"><code>const <span class="type">GValue</span> *a</code></em>,
<em class="parameter"><code>const <span class="type">GValue</span> *b</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> progress</code></em>,
<em class="parameter"><code><span class="type">GValue</span> *retval</code></em>);</pre>
<p>Prototype of the progress function used to compute the value
between the two ends <em class="parameter"><code>a</code></em>
and <em class="parameter"><code>b</code></em>
of an interval depending on
the value of <em class="parameter"><code>progress</code></em>
.</p>
<p>The <span class="type">GValue</span> in <em class="parameter"><code>retval</code></em>
is already initialized with the same
type as <em class="parameter"><code>a</code></em>
and <em class="parameter"><code>b</code></em>
.</p>
<p>This function will be called by <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> if the
type of the values of the interval was registered using
<a class="link" href="clutter-Value-intervals.html#clutter-interval-register-progress-func" title="clutter_interval_register_progress_func ()"><code class="function">clutter_interval_register_progress_func()</code></a>.</p>
<div class="refsect3">
<a name="ClutterProgressFunc.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>a</p></td>
<td class="parameter_description"><p>the initial value of an interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>the final value of an interval</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>progress</p></td>
<td class="parameter_description"><p>the progress factor, between 0 and 1</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>retval</p></td>
<td class="parameter_description"><p>the value used to store the progress</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="ClutterProgressFunc.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the function successfully computed
the value and stored it inside <em class="parameter"><code>retval</code></em>
</p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-interval-register-progress-func"></a><h3>clutter_interval_register_progress_func ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_interval_register_progress_func
(<em class="parameter"><code><span class="type">GType</span> value_type</code></em>,
<em class="parameter"><code><a class="link" href="clutter-Value-intervals.html#ClutterProgressFunc" title="ClutterProgressFunc ()"><span class="type">ClutterProgressFunc</span></a> func</code></em>);</pre>
<p>Sets the progress function for a given <em class="parameter"><code>value_type</code></em>
, like:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="clutter-Value-intervals.html#clutter-interval-register-progress-func">clutter_interval_register_progress_func</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">MY_TYPE_FOO</span><span class="symbol">,</span>
<span class="normal"> my_foo_progress</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<p>Whenever a <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> instance using the default
<span class="type">“compute_value”</span> implementation is set as an
interval between two <span class="type">GValue</span> of type <em class="parameter"><code>value_type</code></em>
, it will call
<em class="parameter"><code>func</code></em>
to establish the value depending on the given progress,
for instance:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> gboolean</span>
<span class="function">my_int_progress</span><span class="normal"> </span><span class="symbol">(</span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">GValue</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">a</span><span class="symbol">,</span>
<span class="normal"> </span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">GValue</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">b</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gdouble</span><span class="normal"> progress</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GValue</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">retval</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="usertype">gint</span><span class="normal"> ia </span><span class="symbol">=</span><span class="normal"> </span><span class="function">g_value_get_int</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">a</span><span class="symbol">);</span>
<span class="normal"> </span><span class="usertype">gint</span><span class="normal"> ib </span><span class="symbol">=</span><span class="normal"> </span><span class="function">g_value_get_int</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">b</span><span class="symbol">);</span>
<span class="normal"> </span><span class="usertype">gint</span><span class="normal"> res </span><span class="symbol">=</span><span class="normal"> factor </span><span class="symbol">*</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">ib </span><span class="symbol">-</span><span class="normal"> ia</span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">+</span><span class="normal"> ia</span><span class="symbol">;</span>
<span class="normal"> </span><span class="function">g_value_set_int</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">retval</span><span class="symbol">,</span><span class="normal"> res</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">return</span><span class="normal"> TRUE</span><span class="symbol">;</span>
<span class="cbracket">}</span>
<span class="function"><a href="clutter-Value-intervals.html#clutter-interval-register-progress-func">clutter_interval_register_progress_func</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">G_TYPE_INT</span><span class="symbol">,</span><span class="normal"> my_int_progress</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<p>To unset a previously set progress function of a <span class="type">GType</span>, pass <code class="literal">NULL</code>
for <em class="parameter"><code>func</code></em>
.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="clutter-interval-register-progress-func.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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_type</p></td>
<td class="parameter_description"><p>a <span class="type">GType</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>func</p></td>
<td class="parameter_description"><p>a <a class="link" href="clutter-Value-intervals.html#ClutterProgressFunc" title="ClutterProgressFunc ()"><span class="type">ClutterProgressFunc</span></a>, or <code class="literal">NULL</code> to unset a previously
set progress function</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
</div>
<div class="refsect1">
<a name="clutter-Value-intervals.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="ClutterInterval-struct"></a><h3>ClutterInterval</h3>
<pre class="programlisting">typedef struct _ClutterInterval ClutterInterval;</pre>
<p>The <a class="link" href="clutter-Value-intervals.html#ClutterInterval"><span class="type">ClutterInterval</span></a> structure contains only private data and should
be accessed using the provided functions.</p>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterIntervalClass"></a><h3>struct ClutterIntervalClass</h3>
<pre class="programlisting">struct ClutterIntervalClass {
gboolean (* validate) (ClutterInterval *interval,
GParamSpec *pspec);
gboolean (* compute_value) (ClutterInterval *interval,
gdouble factor,
GValue *value);
};
</pre>
<p>The <a class="link" href="clutter-Value-intervals.html#ClutterIntervalClass" title="struct ClutterIntervalClass"><span class="type">ClutterIntervalClass</span></a> contains only private data.</p>
<div class="refsect3">
<a name="ClutterIntervalClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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="ClutterIntervalClass.validate"></a>validate</code></em> ()</p></td>
<td class="struct_member_description"><p>virtual function for validating an interval
using a <span class="type">GParamSpec</span></p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="ClutterIntervalClass.compute-value"></a>compute_value</code></em> ()</p></td>
<td class="struct_member_description"><p>virtual function for computing the value
inside an interval using an adimensional factor between 0 and 1</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
</div>
<div class="refsect1">
<a name="clutter-Value-intervals.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="ClutterInterval--final"></a><h3>The <code class="literal">“final”</code> property</h3>
<pre class="programlisting"> “final” <span class="type">GValue</span> *</pre>
<p>The final value of the interval.</p>
<p>Flags: Read / Write</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="ClutterInterval--initial"></a><h3>The <code class="literal">“initial”</code> property</h3>
<pre class="programlisting"> “initial” <span class="type">GValue</span> *</pre>
<p>The initial value of the interval.</p>
<p>Flags: Read / Write</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="ClutterInterval--value-type"></a><h3>The <code class="literal">“value-type”</code> property</h3>
<pre class="programlisting"> “value-type” <span class="type">GType</span> *</pre>
<p>The type of the values in the interval.</p>
<p>Flags: Read / Write / Construct Only</p>
<p>Allowed values: void</p>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.0">1.0</a></p>
</div>
</div>
</div>
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