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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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                  <a href="#mialm-MiaCamera.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="mialm-MiaCamera"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="mialm-MiaCamera.top_of_page"></a>Camera</span></h2>
<p>Camera — A camera description for 3D views</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="mialm-MiaCamera.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">                    <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera">MiaCamera</a>;
<a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="returnvalue">MiaCamera</span></a> *         <a class="link" href="mialm-MiaCamera.html#mia-camera-copy" title="mia_camera_copy ()">mia_camera_copy</a>                     (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *dest</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *orig</code></em>);
<a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="returnvalue">MiaCamera</span></a> *         <a class="link" href="mialm-MiaCamera.html#mia-camera-dup" title="mia_camera_dup ()">mia_camera_dup</a>                      (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *orig</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              <a class="link" href="mialm-MiaCamera.html#mia-camera-get-dist" title="mia_camera_get_dist ()">mia_camera_get_dist</a>                 (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);
<a class="link" href="mialm-MiaVector3d.html#MiaVector3d" title="MiaVector3d"><span class="returnvalue">MiaVector3d</span></a> *       <a class="link" href="mialm-MiaCamera.html#mia-camera-get-location" title="mia_camera_get_location ()">mia_camera_get_location</a>             (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);
<a class="link" href="mialm-MiaQuaternion.html#MiaQuaternion" title="MiaQuaternion"><span class="returnvalue">MiaQuaternion</span></a> *     <a class="link" href="mialm-MiaCamera.html#mia-camera-get-rotation" title="mia_camera_get_rotation ()">mia_camera_get_rotation</a>             (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              <a class="link" href="mialm-MiaCamera.html#mia-camera-get-zoom" title="mia_camera_get_zoom ()">mia_camera_get_zoom</a>                 (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);
<a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="returnvalue">MiaCamera</span></a> *         <a class="link" href="mialm-MiaCamera.html#mia-camera-new" title="mia_camera_new ()">mia_camera_new</a>                      (<em class="parameter"><code><a class="link" href="mialm-MiaVector3d.html#MiaVector3d" title="MiaVector3d"><span class="type">MiaVector3d</span></a> *loc</code></em>,
                                                         <em class="parameter"><code><a class="link" href="mialm-MiaQuaternion.html#MiaQuaternion" title="MiaQuaternion"><span class="type">MiaQuaternion</span></a> *rot</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> zoom</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="mialm-MiaCamera.html#mia-camera-set-dist" title="mia_camera_set_dist ()">mia_camera_set_dist</a>                 (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> dist</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="mialm-MiaCamera.html#mia-camera-set-location" title="mia_camera_set_location ()">mia_camera_set_location</a>             (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a class="link" href="mialm-MiaVector3d.html#MiaVector3d" title="MiaVector3d"><span class="type">MiaVector3d</span></a> *loc</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="mialm-MiaCamera.html#mia-camera-set-rotation" title="mia_camera_set_rotation ()">mia_camera_set_rotation</a>             (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a class="link" href="mialm-MiaQuaternion.html#MiaQuaternion" title="MiaQuaternion"><span class="type">MiaQuaternion</span></a> *rot</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="mialm-MiaCamera.html#mia-camera-set-zoom" title="mia_camera_set_zoom ()">mia_camera_set_zoom</a>                 (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> zoom</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="mialm-MiaCamera.html#mia-camera-test" title="mia_camera_test ()">mia_camera_test</a>                     (<em class="parameter"><code><span class="type">void</span></code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="mialm-MiaCamera.html#mia-camera-xmlio-write" title="mia_camera_xmlio_write ()">mia_camera_xmlio_write</a>              (<em class="parameter"><code><span class="type">xmlNodePtr</span> root</code></em>,
                                                         <em class="parameter"><code><span class="type">xmlNsPtr</span> ns</code></em>,
                                                         <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *c</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="mialm-MiaCamera.description"></a><h2>Description</h2>
<p>
<a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> descibes a point of view within a 3D volume, i.e. 
camera location, view direction, and zoom are stored within this class and 
manipulated by the corresponding functions.
</p>
</div>
<div class="refsect1">
<a name="mialm-MiaCamera.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="MiaCamera"></a><h3>MiaCamera</h3>
<pre class="programlisting">typedef struct _MiaCamera MiaCamera;</pre>
<p>
This defines the camera used to view a 3D data set.
</p>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-copy"></a><h3>mia_camera_copy ()</h3>
<pre class="programlisting"><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="returnvalue">MiaCamera</span></a> *         mia_camera_copy                     (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *dest</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *orig</code></em>);</pre>
<p>
Copy a MiaCamera to an already created instance,
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>destination object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>orig</code></em> :</span></p></td>
<td>original object to be copied</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the copy of the camera</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-dup"></a><h3>mia_camera_dup ()</h3>
<pre class="programlisting"><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="returnvalue">MiaCamera</span></a> *         mia_camera_dup                      (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *orig</code></em>);</pre>
<p>
Create a newly created duplicate of a MiaCamera. The returned camera 
must be freed by calling <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>orig</code></em> :</span></p></td>
<td>camera to be copied</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the copy of the camera</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-get-dist"></a><h3>mia_camera_get_dist ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              mia_camera_get_dist                 (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);</pre>
<p>
Evaluate the distance of the camera from the center of the universe (0,0,0)
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the distance</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-get-location"></a><h3>mia_camera_get_location ()</h3>
<pre class="programlisting"><a class="link" href="mialm-MiaVector3d.html#MiaVector3d" title="MiaVector3d"><span class="returnvalue">MiaVector3d</span></a> *       mia_camera_get_location             (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);</pre>
<p>
get current location of the camera (note that the z value is equal to the distance)
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>location</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-get-rotation"></a><h3>mia_camera_get_rotation ()</h3>
<pre class="programlisting"><a class="link" href="mialm-MiaQuaternion.html#MiaQuaternion" title="MiaQuaternion"><span class="returnvalue">MiaQuaternion</span></a> *     mia_camera_get_rotation             (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);</pre>
<p>
get the current view directopn of the camera as a rotation described by a MiaQuaternion
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Quaternion describing the camera rotation</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-get-zoom"></a><h3>mia_camera_get_zoom ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              mia_camera_get_zoom                 (<em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>);</pre>
<p>
Get the current zoom value of the camera
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>zoom</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-new"></a><h3>mia_camera_new ()</h3>
<pre class="programlisting"><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="returnvalue">MiaCamera</span></a> *         mia_camera_new                      (<em class="parameter"><code><a class="link" href="mialm-MiaVector3d.html#MiaVector3d" title="MiaVector3d"><span class="type">MiaVector3d</span></a> *loc</code></em>,
                                                         <em class="parameter"><code><a class="link" href="mialm-MiaQuaternion.html#MiaQuaternion" title="MiaQuaternion"><span class="type">MiaQuaternion</span></a> *rot</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> zoom</code></em>);</pre>
<p>
Create a camera defined by its position, heading, distance and   
 zoom. The created object must be destroyed by calling <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a>
</p>
<p>
 For some reason I can not remember, the location z value is ignored and 
 the distance value is given separately.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>loc</code></em> :</span></p></td>
<td>The camera location, z is ignored</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rot</code></em> :</span></p></td>
<td>the rotation angle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>zoom</code></em> :</span></p></td>
<td>camera zoom into the field of view</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly created quaternion</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-set-dist"></a><h3>mia_camera_set_dist ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                mia_camera_set_dist                 (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> dist</code></em>);</pre>
<p>
Sets the new distance to the center (0,0,0), can also be achieved by setting the full location
</p>
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<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
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<td><p><span class="term"><em class="parameter"><code>dist</code></em> :</span></p></td>
<td>new distance to the center of the universe</td>
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<div class="refsect2">
<a name="mia-camera-set-location"></a><h3>mia_camera_set_location ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                mia_camera_set_location             (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a class="link" href="mialm-MiaVector3d.html#MiaVector3d" title="MiaVector3d"><span class="type">MiaVector3d</span></a> *loc</code></em>);</pre>
<p>
Set the new location of the camera
</p>
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<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>loc</code></em> :</span></p></td>
<td>new location of the camera</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-set-rotation"></a><h3>mia_camera_set_rotation ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                mia_camera_set_rotation             (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a class="link" href="mialm-MiaQuaternion.html#MiaQuaternion" title="MiaQuaternion"><span class="type">MiaQuaternion</span></a> *rot</code></em>);</pre>
<p>
sets the current view direction of the camera as a rotation described by a MiaQuaternion
</p>
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<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
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<td><p><span class="term"><em class="parameter"><code>rot</code></em> :</span></p></td>
<td>new rotation of the camera position around the center of the universe</td>
</tr>
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</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-set-zoom"></a><h3>mia_camera_set_zoom ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                mia_camera_set_zoom                 (<em class="parameter"><code><a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *self</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> zoom</code></em>);</pre>
<p>
sets the new zoom of the camera (i.e. change field of view)
</p>
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<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>the camera</td>
</tr>
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<td><p><span class="term"><em class="parameter"><code>zoom</code></em> :</span></p></td>
<td>the new zoom value for the camera</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-test"></a><h3>mia_camera_test ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            mia_camera_test                     (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Run some tests on the camera (not impmented)
</p>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if tests were successful</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="mia-camera-xmlio-write"></a><h3>mia_camera_xmlio_write ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            mia_camera_xmlio_write              (<em class="parameter"><code><span class="type">xmlNodePtr</span> root</code></em>,
                                                         <em class="parameter"><code><span class="type">xmlNsPtr</span> ns</code></em>,
                                                         <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="mialm-MiaCamera.html#MiaCamera" title="MiaCamera"><span class="type">MiaCamera</span></a> *c</code></em>);</pre>
<p>
Write the MiaCamera instance to an XML node
</p>
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<td><p><span class="term"><em class="parameter"><code>root</code></em> :</span></p></td>
<td>XML node to attach the camera description to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ns</code></em> :</span></p></td>
<td>XML namespace</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tag</code></em> :</span></p></td>
<td>XML tag to use to create the XML node.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td>
<td>the camera to store</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>true if the camera was sucessfully written nor c==NULL</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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