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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<head>
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<title>quat</title>
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<th width="100%" align="center">libg3d Reference Manual</th>
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<tr><td colspan="5" class="shortcuts"><nobr><a href="#libg3d-quat.synopsis" class="shortcut">Top</a>
|
<a href="#libg3d-quat.description" class="shortcut">Description</a></nobr></td></tr>
</table>
<div class="refentry" lang="en">
<a name="libg3d-quat"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libg3d-quat.top_of_page"></a>quat</span></h2>
<p>quat — quaternion helpers</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="libg3d-quat.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <g3d/quat.h>
typedef <a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a>;
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="libg3d-quat.html#g3d-quat-add" title="g3d_quat_add ()">g3d_quat_add</a> (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *qr,
<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q1,
<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q2);
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="libg3d-quat.html#g3d-quat-normalize" title="g3d_quat_normalize ()">g3d_quat_normalize</a> (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q);
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="libg3d-quat.html#g3d-quat-rotate" title="g3d_quat_rotate ()">g3d_quat_rotate</a> (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-vector.html#G3DVector" title="G3DVector">G3DVector</a> *axis,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> angle);
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="libg3d-quat.html#g3d-quat-to-matrix" title="g3d_quat_to_matrix ()">g3d_quat_to_matrix</a> (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-matrix.html#G3DMatrix" title="G3DMatrix">G3DMatrix</a> *matrix);
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="libg3d-quat.html#g3d-quat-to-rotation-xyz" title="g3d_quat_to_rotation_xyz ()">g3d_quat_to_rotation_xyz</a> (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *rx,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *ry,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *rz);
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="libg3d-quat.html#g3d-quat-trackball" title="g3d_quat_trackball ()">g3d_quat_trackball</a> (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> x1,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> y1,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> x2,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> y2,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> r);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="libg3d-quat.description"></a><h2>Description</h2>
<p>
</p>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="libg3d-quat.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="G3DQuat"></a><h3>G3DQuat</h3>
<pre class="programlisting">typedef G3DFloat G3DQuat;
</pre>
<p>
Quaternion element type.</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-quat-add"></a><h3>g3d_quat_add ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> g3d_quat_add (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *qr,
<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q1,
<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q2);</pre>
<p>
Add two quats.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>qr</code></em> :</span></p></td>
<td> result quat
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>q1</code></em> :</span></p></td>
<td> first quat
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>q2</code></em> :</span></p></td>
<td> second quat
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE on success, FALSE else
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-quat-normalize"></a><h3>g3d_quat_normalize ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> g3d_quat_normalize (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q);</pre>
<p>
normalize the quaternion to a length of 1.0.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>q</code></em> :</span></p></td>
<td> a quaternion
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE on success, FALSE else
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-quat-rotate"></a><h3>g3d_quat_rotate ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> g3d_quat_rotate (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-vector.html#G3DVector" title="G3DVector">G3DVector</a> *axis,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> angle);</pre>
<p>
Encode a rotation around an axis into quaternion.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>q</code></em> :</span></p></td>
<td> resulting quat
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>axis</code></em> :</span></p></td>
<td> rotation axis
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>angle</code></em> :</span></p></td>
<td> rotation angle
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE on success, FALSE else
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-quat-to-matrix"></a><h3>g3d_quat_to_matrix ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> g3d_quat_to_matrix (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-matrix.html#G3DMatrix" title="G3DMatrix">G3DMatrix</a> *matrix);</pre>
<p>
Convert a quaternion to a transformation matrix.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>q</code></em> :</span></p></td>
<td> source quat
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>matrix</code></em> :</span></p></td>
<td> resulting matrix
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE on success, FALSE else
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-quat-to-rotation-xyz"></a><h3>g3d_quat_to_rotation_xyz ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> g3d_quat_to_rotation_xyz (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *rx,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *ry,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *rz);</pre>
<p>
Calculate the rotation around the three coordinate axes from a given
quaternion.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>q</code></em> :</span></p></td>
<td> a quaternion
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rx</code></em> :</span></p></td>
<td> rotation around x axis
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ry</code></em> :</span></p></td>
<td> rotation around y axis
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rz</code></em> :</span></p></td>
<td> rotation around z axis
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE on success, FALSE else
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-quat-trackball"></a><h3>g3d_quat_trackball ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> g3d_quat_trackball (<a class="link" href="libg3d-quat.html#G3DQuat" title="G3DQuat">G3DQuat</a> *q,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> x1,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> y1,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> x2,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> y2,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> r);</pre>
<p>
Emulate a virtual trackball movement and return rotation as quaternion.
The x and y values of the starting and end point of the movement have
to be in the range -1.0 .. 1.0.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>q</code></em> :</span></p></td>
<td> resulting quaternion
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td> x value of first point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td> y value of first point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x2</code></em> :</span></p></td>
<td> x value of second point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y2</code></em> :</span></p></td>
<td> y value of second point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r</code></em> :</span></p></td>
<td> radius of virtual trackball, usually 0.8
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE on success, FALSE else
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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