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<a href="#pigment-PgmCommon.description" class="shortcut">Description</a>
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<div class="refentry" lang="en">
<a name="pigment-PgmCommon"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="pigment-PgmCommon.top_of_page"></a>PgmCommon</span></h2>
<p>PgmCommon — Various functions used for common tasks.</p>
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<div class="refsynopsisdiv">
<a name="pigment-PgmCommon.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <pgm/pgm.h>
#define <a class="link" href="pigment-PgmCommon.html#PGM-DEGREES-TO-RADIANS--CAPS" title="PGM_DEGREES_TO_RADIANS()">PGM_DEGREES_TO_RADIANS</a> (theta)
#define <a class="link" href="pigment-PgmCommon.html#PGM-RADIANS-TO-DEGREES--CAPS" title="PGM_RADIANS_TO_DEGREES()">PGM_RADIANS_TO_DEGREES</a> (theta)
#define <a class="link" href="pigment-PgmCommon.html#PGM-SINCOS--CAPS" title="PGM_SINCOS()">PGM_SINCOS</a> (theta,s,c)
#define <a class="link" href="pigment-PgmCommon.html#PGM-FABSF--CAPS" title="PGM_FABSF()">PGM_FABSF</a> (x)
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint32"
>gint32</a> <a class="link" href="pigment-PgmCommon.html#pgm-lrintf" title="pgm_lrintf ()">pgm_lrintf</a> (<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> x);
enum <a class="link" href="pigment-PgmCommon.html#PgmError" title="enum PgmError">PgmError</a>;
</pre>
</div>
<div class="refsect1" lang="en">
<a name="pigment-PgmCommon.description"></a><h2>Description</h2>
<p>
Various functions used by Pigment for common tasks.
</p>
<p>
Last reviewed on 2009-05-07 (0.3.16)</p>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="pigment-PgmCommon.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="PGM-DEGREES-TO-RADIANS--CAPS"></a><h3>PGM_DEGREES_TO_RADIANS()</h3>
<pre class="programlisting">#define PGM_DEGREES_TO_RADIANS(theta) ((theta) * (G_PI / 180.0f))
</pre>
<p>
Converts from degrees to radians.</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>theta</code></em> :</span></p></td>
<td> an angle in degrees.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="PGM-RADIANS-TO-DEGREES--CAPS"></a><h3>PGM_RADIANS_TO_DEGREES()</h3>
<pre class="programlisting">#define PGM_RADIANS_TO_DEGREES(theta) ((theta) * (180.0f / G_PI))
</pre>
<p>
Converts from radians to degrees.</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>theta</code></em> :</span></p></td>
<td> an angle in radians.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="PGM-SINCOS--CAPS"></a><h3>PGM_SINCOS()</h3>
<pre class="programlisting">#define PGM_SINCOS(theta,s,c)</pre>
<p>
Calculates sine and cosine of the angle <em class="parameter"><code>theta</code></em> simultaneously.</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>theta</code></em> :</span></p></td>
<td> a float representing an angle in radians.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>s</code></em> :</span></p></td>
<td> the address of the float where the sine value is going to be stored.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td>
<td> the address of the float where the cosine value is going to be stored.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="PGM-FABSF--CAPS"></a><h3>PGM_FABSF()</h3>
<pre class="programlisting">#define PGM_FABSF(x)</pre>
<p>
Calculates the absolute value of float.</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>x</code></em> :</span></p></td>
<td> the floating-point number.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="pgm-lrintf"></a><h3>pgm_lrintf ()</h3>
<pre class="programlisting"><a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint32"
>gint32</a> pgm_lrintf (<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> x);</pre>
<p>
Round <em class="parameter"><code>x</code></em> to nearest integer using the current FPU rounding mode. On platforms
other than Windows where the C99 lrintf function is not available, the
function reverts to a float-to-int cast which uses the truncate FPU rounding
mode.</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>x</code></em> :</span></p></td>
<td> the input floating-point number.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the rounded nearest integer.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="PgmError"></a><h3>enum PgmError</h3>
<pre class="programlisting">typedef enum {
PGM_ERROR_X,
PGM_ERROR_OK
} PgmError;
</pre>
<p>
Every Pigment method returns an error code from that list.</p>
<p>
</p>
<div class="variablelist"><table border="0">
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<tbody>
<tr>
<td><p><a name="PGM-ERROR-X--CAPS"></a><span class="term"><code class="literal">PGM_ERROR_X</code></span></p></td>
<td> Generic error code.
</td>
</tr>
<tr>
<td><p><a name="PGM-ERROR-OK--CAPS"></a><span class="term"><code class="literal">PGM_ERROR_OK</code></span></p></td>
<td> No error occured.
</td>
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