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<a href="#GeoclueVelocity.signals" class="shortcut">Signals</a>
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<div class="refentry">
<a name="GeoclueVelocity"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GeoclueVelocity.top_of_page"></a>GeoclueVelocity</span></h2>
<p>GeoclueVelocity — Geoclue velocity client API</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="GeoclueVelocity.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define <a class="link" href="GeoclueVelocity.html#GEOCLUE-VELOCITY-INTERFACE-NAME:CAPS" title="GEOCLUE_VELOCITY_INTERFACE_NAME">GEOCLUE_VELOCITY_INTERFACE_NAME</a>
<a class="link" href="GeoclueVelocity.html#GeoclueVelocity-struct" title="GeoclueVelocity">GeoclueVelocity</a>;
<span class="returnvalue">void</span> (<a class="link" href="GeoclueVelocity.html#GeoclueVelocityCallback" title="GeoclueVelocityCallback ()">*GeoclueVelocityCallback</a>) (<em class="parameter"><code><a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> *velocity</code></em>,
<em class="parameter"><code><a class="link" href="geoclue-geoclue-types.html#GeoclueVelocityFields" title="enum GeoclueVelocityFields"><span class="type">GeoclueVelocityFields</span></a> fields</code></em>,
<em class="parameter"><code><span class="type">int</span> timestamp</code></em>,
<em class="parameter"><code><span class="type">double</span> speed</code></em>,
<em class="parameter"><code><span class="type">double</span> direction</code></em>,
<em class="parameter"><code><span class="type">double</span> climb</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> userdata</code></em>);
<a class="link" href="GeoclueVelocity.html#GeoclueVelocityClass" title="GeoclueVelocityClass">GeoclueVelocityClass</a>;
<a class="link" href="geoclue-geoclue-types.html#GeoclueVelocityFields" title="enum GeoclueVelocityFields"><span class="returnvalue">GeoclueVelocityFields</span></a> <a class="link" href="GeoclueVelocity.html#geoclue-velocity-get-velocity" title="geoclue_velocity_get_velocity ()">geoclue_velocity_get_velocity</a> (<em class="parameter"><code><a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> *velocity</code></em>,
<em class="parameter"><code><span class="type">int</span> *timestamp</code></em>,
<em class="parameter"><code><span class="type">double</span> *speed</code></em>,
<em class="parameter"><code><span class="type">double</span> *direction</code></em>,
<em class="parameter"><code><span class="type">double</span> *climb</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GeoclueVelocity.html#geoclue-velocity-get-velocity-async" title="geoclue_velocity_get_velocity_async ()">geoclue_velocity_get_velocity_async</a> (<em class="parameter"><code><a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> *velocity</code></em>,
<em class="parameter"><code><a class="link" href="GeoclueVelocity.html#GeoclueVelocityCallback" title="GeoclueVelocityCallback ()"><span class="type">GeoclueVelocityCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> userdata</code></em>);
<a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="returnvalue">GeoclueVelocity</span></a> * <a class="link" href="GeoclueVelocity.html#geoclue-velocity-new" title="geoclue_velocity_new ()">geoclue_velocity_new</a> (<em class="parameter"><code>const <span class="type">char</span> *service</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *path</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GeoclueVelocity.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a class="link" href="GeoclueProvider.html" title="GeoclueProvider">GeoclueProvider</a>
+----GeoclueVelocity
</pre>
</div>
<div class="refsect1">
<a name="GeoclueVelocity.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="GeoclueVelocity.html#GeoclueVelocity-velocity-changed" title='The "velocity-changed" signal'>velocity-changed</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-NO-RECURSE:CAPS"><code class="literal">No Recursion</code></a>
</pre>
</div>
<div class="refsect1">
<a name="GeoclueVelocity.description"></a><h2>Description</h2>
<p>
<a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> contains velocity-related methods and signals.
It is part of the Geoclue public C client API which uses D-Bus
to communicate with the actual provider.
</p>
<p>
After a <a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> is created with
<a class="link" href="GeoclueVelocity.html#geoclue-velocity-new" title="geoclue_velocity_new ()"><code class="function">geoclue_velocity_new()</code></a>, the
<a class="link" href="GeoclueVelocity.html#geoclue-velocity-get-velocity" title="geoclue_velocity_get_velocity ()"><code class="function">geoclue_velocity_get_velocity()</code></a> method and the VelocityChanged-signal
can be used to obtain the current velocity.
</p>
</div>
<div class="refsect1">
<a name="GeoclueVelocity.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GEOCLUE-VELOCITY-INTERFACE-NAME:CAPS"></a><h3>GEOCLUE_VELOCITY_INTERFACE_NAME</h3>
<pre class="programlisting">#define GEOCLUE_VELOCITY_INTERFACE_NAME "org.freedesktop.Geoclue.Velocity"
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GeoclueVelocity-struct"></a><h3>GeoclueVelocity</h3>
<pre class="programlisting">typedef struct _GeoclueVelocity GeoclueVelocity;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GeoclueVelocityCallback"></a><h3>GeoclueVelocityCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GeoclueVelocityCallback) (<em class="parameter"><code><a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> *velocity</code></em>,
<em class="parameter"><code><a class="link" href="geoclue-geoclue-types.html#GeoclueVelocityFields" title="enum GeoclueVelocityFields"><span class="type">GeoclueVelocityFields</span></a> fields</code></em>,
<em class="parameter"><code><span class="type">int</span> timestamp</code></em>,
<em class="parameter"><code><span class="type">double</span> speed</code></em>,
<em class="parameter"><code><span class="type">double</span> direction</code></em>,
<em class="parameter"><code><span class="type">double</span> climb</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> userdata</code></em>);</pre>
<p>
Callback function for <a class="link" href="GeoclueVelocity.html#geoclue-velocity-get-velocity-async" title="geoclue_velocity_get_velocity_async ()"><code class="function">geoclue_velocity_get_velocity_async()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>velocity</code></em> :</span></p></td>
<td>A <a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fields</code></em> :</span></p></td>
<td>A <a class="link" href="geoclue-geoclue-types.html#GeoclueVelocityFields" title="enum GeoclueVelocityFields"><span class="type">GeoclueVelocityFields</span></a> bitfield representing the validity of the velocity values</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td>Time of velocity measurement (unix timestamp)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>speed</code></em> :</span></p></td>
<td>Horizontal speed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>direction</code></em> :</span></p></td>
<td>Horizontal direction (bearing)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>climb</code></em> :</span></p></td>
<td>Vertical speed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Error as <a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> (may be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>userdata</code></em> :</span></p></td>
<td>User data pointer set in <a class="link" href="GeoclueVelocity.html#geoclue-velocity-get-velocity-async" title="geoclue_velocity_get_velocity_async ()"><code class="function">geoclue_velocity_get_velocity_async()</code></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GeoclueVelocityClass"></a><h3>GeoclueVelocityClass</h3>
<pre class="programlisting">typedef struct {
GeoclueProviderClass provider_class;
void (* velocity_changed) (GeoclueVelocity *velocity,
GeoclueVelocityFields fields,
int timestamp,
double speed,
double direction,
double climb);
} GeoclueVelocityClass;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="geoclue-velocity-get-velocity"></a><h3>geoclue_velocity_get_velocity ()</h3>
<pre class="programlisting"><a class="link" href="geoclue-geoclue-types.html#GeoclueVelocityFields" title="enum GeoclueVelocityFields"><span class="returnvalue">GeoclueVelocityFields</span></a> geoclue_velocity_get_velocity (<em class="parameter"><code><a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> *velocity</code></em>,
<em class="parameter"><code><span class="type">int</span> *timestamp</code></em>,
<em class="parameter"><code><span class="type">double</span> *speed</code></em>,
<em class="parameter"><code><span class="type">double</span> *direction</code></em>,
<em class="parameter"><code><span class="type">double</span> *climb</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Obtains the current velocity. <em class="parameter"><code>timestamp</code></em> will contain the time of
the actual velocity measurement.
</p>
<p>
If the caller is not interested in some values, the pointers can be
left <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>velocity</code></em> :</span></p></td>
<td>A <a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td>Pointer to returned time of velocity measurement (unix timestamp) or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>speed</code></em> :</span></p></td>
<td>Pointer to returned horizontal speed or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>direction</code></em> :</span></p></td>
<td>Pointer to returned horizontal direction (bearing) or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>climb</code></em> :</span></p></td>
<td>Pointer to returned vertical speed or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Pointer to returned <a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A <a class="link" href="geoclue-geoclue-types.html#GeoclueVelocityFields" title="enum GeoclueVelocityFields"><span class="type">GeoclueVelocityFields</span></a> bitfield representing the
validity of the velocity values.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="geoclue-velocity-get-velocity-async"></a><h3>geoclue_velocity_get_velocity_async ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> geoclue_velocity_get_velocity_async (<em class="parameter"><code><a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> *velocity</code></em>,
<em class="parameter"><code><a class="link" href="GeoclueVelocity.html#GeoclueVelocityCallback" title="GeoclueVelocityCallback ()"><span class="type">GeoclueVelocityCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> userdata</code></em>);</pre>
<p>
Function returns (essentially) immediately and calls <em class="parameter"><code>callback</code></em> when current velocity
is available or when D-Bus timeouts.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>velocity</code></em> :</span></p></td>
<td>A <a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>callback</code></em> :</span></p></td>
<td>A <a class="link" href="GeoclueVelocity.html#GeoclueVelocityCallback" title="GeoclueVelocityCallback ()"><span class="type">GeoclueVelocityCallback</span></a> function that should be called when return values are available</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>userdata</code></em> :</span></p></td>
<td>pointer for user specified data</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="geoclue-velocity-new"></a><h3>geoclue_velocity_new ()</h3>
<pre class="programlisting"><a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="returnvalue">GeoclueVelocity</span></a> * geoclue_velocity_new (<em class="parameter"><code>const <span class="type">char</span> *service</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *path</code></em>);</pre>
<p>
Creates a <a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> with given D-Bus service name and path.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>service</code></em> :</span></p></td>
<td>D-Bus service name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>path</code></em> :</span></p></td>
<td>D-Bus path name</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Pointer to a new <a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GeoclueVelocity.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GeoclueVelocity-velocity-changed"></a><h3>The <code class="literal">"velocity-changed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> *velocity,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> fields,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> timestamp,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> speed,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> direction,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> climb,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-NO-RECURSE:CAPS"><code class="literal">No Recursion</code></a></pre>
<p>
The geoclue-changed signal is emitted each time the velocity changes.
</p>
<p>
Note that not all providers support signals.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>velocity</code></em> :</span></p></td>
<td>the <a class="link" href="GeoclueVelocity.html" title="GeoclueVelocity"><span class="type">GeoclueVelocity</span></a> object emitting the signal</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fields</code></em> :</span></p></td>
<td>A <a class="link" href="geoclue-geoclue-types.html#GeoclueVelocityFields" title="enum GeoclueVelocityFields"><span class="type">GeoclueVelocityFields</span></a> bitfield representing the validity of the velocity values</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td>Time of velocity measurement (Unix timestamp)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>speed</code></em> :</span></p></td>
<td>horizontal speed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>direction</code></em> :</span></p></td>
<td>horizontal direction (bearing)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>climb</code></em> :</span></p></td>
<td>vertical speed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
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