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<a href="#libgimpmath-GimpMath.description" class="shortcut">Description</a>
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<h2><span class="refentrytitle"><a name="libgimpmath-GimpMath.top_of_page"></a>GimpMath</span></h2>
<p>GimpMath — Mathematical definitions and macros.</p>
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<div class="refsynopsisdiv">
<a name="libgimpmath-GimpMath.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define <a class="link" href="libgimpmath-GimpMath.html#RINT:CAPS" title="RINT()">RINT</a> (x)
#define <a class="link" href="libgimpmath-GimpMath.html#ROUND:CAPS" title="ROUND()">ROUND</a> (x)
#define <a class="link" href="libgimpmath-GimpMath.html#SQR:CAPS" title="SQR()">SQR</a> (x)
#define <a class="link" href="libgimpmath-GimpMath.html#MAX255:CAPS" title="MAX255()">MAX255</a> (a)
#define <a class="link" href="libgimpmath-GimpMath.html#CLAMP0255:CAPS" title="CLAMP0255()">CLAMP0255</a> (a)
#define <a class="link" href="libgimpmath-GimpMath.html#gimp-deg-to-rad" title="gimp_deg_to_rad()">gimp_deg_to_rad</a> (angle)
#define <a class="link" href="libgimpmath-GimpMath.html#gimp-rad-to-deg" title="gimp_rad_to_deg()">gimp_rad_to_deg</a> (angle)
</pre>
</div>
<div class="refsect1">
<a name="libgimpmath-GimpMath.description"></a><h2>Description</h2>
<p>
Mathematical definitions and macros. These macros should be used
rather than the ones from math.h for enhanced portability.
</p>
</div>
<div class="refsect1">
<a name="libgimpmath-GimpMath.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="RINT:CAPS"></a><h3>RINT()</h3>
<pre class="programlisting">#define RINT(x) rint(x)
</pre>
<p>
This macro rounds its argument <em class="parameter"><code>x</code></em> to an integer value in floating point
format.
</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 value to be rounded.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="ROUND:CAPS"></a><h3>ROUND()</h3>
<pre class="programlisting">#define ROUND(x) ((int) ((x) + 0.5))
</pre>
<p>
This macro rounds its argument <em class="parameter"><code>x</code></em> to the nearest integer.
</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 value to be rounded.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="SQR:CAPS"></a><h3>SQR()</h3>
<pre class="programlisting">#define SQR(x) ((x) * (x))
</pre>
<p>
This macro squares its argument <em class="parameter"><code>x</code></em>.
</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 value to be squared.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="MAX255:CAPS"></a><h3>MAX255()</h3>
<pre class="programlisting">#define MAX255(a) ((a) | (((a) & 256) - (((a) & 256) >> 8)))
</pre>
<p>
This macro limits it argument <em class="parameter"><code>a</code></em>, an (0-511) int, to 255.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>the value to be limited.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="CLAMP0255:CAPS"></a><h3>CLAMP0255()</h3>
<pre class="programlisting">#define CLAMP0255(a) CLAMP(a,0,255)
</pre>
<p>
This macro clamps its argument <em class="parameter"><code>a</code></em>, an int32-range int, between 0 and
255 inclusive.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>the value to be clamped.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-deg-to-rad"></a><h3>gimp_deg_to_rad()</h3>
<pre class="programlisting">#define gimp_deg_to_rad(angle) ((angle) * (2.0 * G_PI) / 360.0)
</pre>
<p>
This macro converts its argument <em class="parameter"><code>angle</code></em> from degree to radian.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>angle</code></em> :</span></p></td>
<td>the angle to be converted.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-rad-to-deg"></a><h3>gimp_rad_to_deg()</h3>
<pre class="programlisting">#define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI))
</pre>
<p>
This macro converts its argument <em class="parameter"><code>angle</code></em> from radian to degree.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>angle</code></em> :</span></p></td>
<td>the angle to be converted.</td>
</tr></tbody>
</table></div>
</div>
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