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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QGLColormap Class Reference<br><small>[<a href="opengl.html">OpenGL module</a>]</small></h1>
<p>The QGLColormap class is used for installing custom colormaps into
QGLWidgets.
<a href="#details">More...</a>
<p><tt>#include <<a href="qglcolormap-h.html">qglcolormap.h</a>></tt>
<p><a href="qglcolormap-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#QGLColormap"><b>QGLColormap</b></a> ()</li>
<li class=fn><a href="#QGLColormap-2"><b>QGLColormap</b></a> ( const QGLColormap & map )</li>
<li class=fn><a href="#~QGLColormap"><b>~QGLColormap</b></a> ()</li>
<li class=fn>QGLColormap & <a href="#operator-eq"><b>operator=</b></a> ( const QGLColormap & map )</li>
<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
<li class=fn>int <a href="#size"><b>size</b></a> () const</li>
<li class=fn>void <a href="#detach"><b>detach</b></a> ()</li>
<li class=fn>void <a href="#setEntries"><b>setEntries</b></a> ( int count, const QRgb * colors, int base = 0 )</li>
<li class=fn>void <a href="#setEntry"><b>setEntry</b></a> ( int idx, QRgb color )</li>
<li class=fn>void <a href="#setEntry-2"><b>setEntry</b></a> ( int idx, const QColor & color )</li>
<li class=fn>QRgb <a href="#entryRgb"><b>entryRgb</b></a> ( int idx ) const</li>
<li class=fn>QColor <a href="#entryColor"><b>entryColor</b></a> ( int idx ) const</li>
<li class=fn>int <a href="#find"><b>find</b></a> ( QRgb color ) const</li>
<li class=fn>int <a href="#findNearest"><b>findNearest</b></a> ( QRgb color ) const</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QGLColormap class is used for installing custom colormaps into
QGLWidgets.
<p>
<p> QGLColormap provides a platform independent way of specifying and
installing indexed colormaps into QGLWidgets. QGLColormap is
especially useful when using the <a href="opengl.html">OpenGL</a>
color-index mode.
<p> Under X11 you must use an X server that supports either a <tt>PseudoColor</tt> or <tt>DirectColor</tt> visual class. If your X server
currently only provides a <tt>GrayScale</tt>, <tt>TrueColor</tt>, <tt>StaticColor</tt> or <tt>StaticGray</tt> visual, you will not be able to
allocate colorcells for writing. If this is the case, try setting
your X server to 8 bit mode. It should then provide you with at
least a <tt>PseudoColor</tt> visual. Note that you may experience
colormap flashing if your X server is running in 8 bit mode.
<p> Under Windows the size of the colormap is always set to 256
colors. Note that under Windows you can also install colormaps
in child widgets.
<p> This class uses <a href="shclass.html#explicit-sharing">explicit sharing</a> (see <a href="shclass.html">Shared
Classes</a>).
<p> Example of use:
<pre>
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qglcolormap-h.html">qglcolormap.h</a>>
int main()
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
MySuperGLWidget widget( 0 ); // A QGLWidget in color-index mode
QGLColormap colormap;
// This will fill the colormap with colors ranging from
// black to white.
for ( int i = 0; i < colormap.<a href="#size">size</a>(); i++ )
colormap.<a href="#setEntry">setEntry</a>( i, qRgb( i, i, i ) );
widget.setColormap( colormap );
widget.show();
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p> <p>See also <a href="qglwidget.html#setColormap">QGLWidget::setColormap</a>(), <a href="qglwidget.html#colormap">QGLWidget::colormap</a>(), <a href="graphics.html">Graphics Classes</a>, and <a href="images.html">Image Processing Classes</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QGLColormap"></a>QGLColormap::QGLColormap ()
</h3>
Construct a QGLColormap.
<h3 class=fn><a name="QGLColormap-2"></a>QGLColormap::QGLColormap ( const <a href="qglcolormap.html">QGLColormap</a> & map )
</h3>
Construct a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>map</em>.
<h3 class=fn><a name="~QGLColormap"></a>QGLColormap::~QGLColormap ()
</h3>
Dereferences the QGLColormap and deletes it if this was the last
reference to it.
<h3 class=fn>void <a name="detach"></a>QGLColormap::detach ()
</h3>
Detaches this QGLColormap from the shared block.
<h3 class=fn><a href="qcolor.html">QColor</a> <a name="entryColor"></a>QGLColormap::entryColor ( int idx ) const
</h3>
Returns the QRgb value in the colorcell with index <em>idx</em>.
<h3 class=fn>QRgb <a name="entryRgb"></a>QGLColormap::entryRgb ( int idx ) const
</h3>
Returns the QRgb value in the colorcell with index <em>idx</em>.
<h3 class=fn>int <a name="find"></a>QGLColormap::find ( QRgb color ) const
</h3>
Returns the index of the color <em>color</em>. If <em>color</em> is not in the
map, -1 is returned.
<h3 class=fn>int <a name="findNearest"></a>QGLColormap::findNearest ( QRgb color ) const
</h3>
Returns the index of the color that is the closest match to color
<em>color</em>.
<h3 class=fn>bool <a name="isEmpty"></a>QGLColormap::isEmpty () const
</h3>
Returns TRUE if the colormap is empty; otherwise returns FALSE. A
colormap with no color values set is considered to be empty.
<h3 class=fn><a href="qglcolormap.html">QGLColormap</a> & <a name="operator-eq"></a>QGLColormap::operator= ( const <a href="qglcolormap.html">QGLColormap</a> & map )
</h3>
Assign a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>map</em> to this QGLColormap.
<h3 class=fn>void <a name="setEntries"></a>QGLColormap::setEntries ( int count, const QRgb * colors, int base = 0 )
</h3>
Set an array of cells in this colormap. <em>count</em> is the number of
colors that should be set, <em>colors</em> is the array of colors, and
<em>base</em> is the starting index.
<h3 class=fn>void <a name="setEntry"></a>QGLColormap::setEntry ( int idx, QRgb color )
</h3>
Set cell at index <em>idx</em> in the colormap to color <em>color</em>.
<h3 class=fn>void <a name="setEntry-2"></a>QGLColormap::setEntry ( int idx, const <a href="qcolor.html">QColor</a> & color )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Set the cell with index <em>idx</em> in the colormap to color <em>color</em>.
<h3 class=fn>int <a name="size"></a>QGLColormap::size () const
</h3>
Returns the number of colorcells in the colormap.
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