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180 lines
8.2 KiB
180 lines
8.2 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/opengl/qglcolormap.cpp:38 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QGLColormap Class</title>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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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>
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<p>The QGLColormap class is used for installing custom colormaps into
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QGLWidgets.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qglcolormap-h.html">qglcolormap.h</a>></tt>
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<p><a href="qglcolormap-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QGLColormap"><b>QGLColormap</b></a> ()</li>
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<li class=fn><a href="#QGLColormap-2"><b>QGLColormap</b></a> ( const QGLColormap & map )</li>
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<li class=fn><a href="#~QGLColormap"><b>~QGLColormap</b></a> ()</li>
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<li class=fn>QGLColormap & <a href="#operator-eq"><b>operator=</b></a> ( const QGLColormap & map )</li>
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<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
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<li class=fn>int <a href="#size"><b>size</b></a> () const</li>
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<li class=fn>void <a href="#detach"><b>detach</b></a> ()</li>
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<li class=fn>void <a href="#setEntries"><b>setEntries</b></a> ( int count, const QRgb * colors, int base = 0 )</li>
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<li class=fn>void <a href="#setEntry"><b>setEntry</b></a> ( int idx, QRgb color )</li>
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<li class=fn>void <a href="#setEntry-2"><b>setEntry</b></a> ( int idx, const QColor & color )</li>
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<li class=fn>QRgb <a href="#entryRgb"><b>entryRgb</b></a> ( int idx ) const</li>
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<li class=fn>QColor <a href="#entryColor"><b>entryColor</b></a> ( int idx ) const</li>
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<li class=fn>int <a href="#find"><b>find</b></a> ( QRgb color ) const</li>
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<li class=fn>int <a href="#findNearest"><b>findNearest</b></a> ( QRgb color ) const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QGLColormap class is used for installing custom colormaps into
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QGLWidgets.
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<p>
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<p> QGLColormap provides a platform independent way of specifying and
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installing indexed colormaps into QGLWidgets. QGLColormap is
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especially useful when using the <a href="opengl.html">OpenGL</a>
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color-index mode.
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<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
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currently only provides a <tt>GrayScale</tt>, <tt>TrueColor</tt>, <tt>StaticColor</tt> or <tt>StaticGray</tt> visual, you will not be able to
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allocate colorcells for writing. If this is the case, try setting
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your X server to 8 bit mode. It should then provide you with at
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least a <tt>PseudoColor</tt> visual. Note that you may experience
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colormap flashing if your X server is running in 8 bit mode.
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<p> Under Windows the size of the colormap is always set to 256
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colors. Note that under Windows you can also install colormaps
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in child widgets.
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<p> This class uses <a href="shclass.html#explicit-sharing">explicit sharing</a> (see <a href="shclass.html">Shared
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Classes</a>).
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<p> Example of use:
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<pre>
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <<a href="qglcolormap-h.html">qglcolormap.h</a>>
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int main()
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv );
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MySuperGLWidget widget( 0 ); // A QGLWidget in color-index mode
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QGLColormap colormap;
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// This will fill the colormap with colors ranging from
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// black to white.
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for ( int i = 0; i < colormap.<a href="#size">size</a>(); i++ )
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colormap.<a href="#setEntry">setEntry</a>( i, qRgb( i, i, i ) );
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widget.setColormap( colormap );
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widget.show();
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return a.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<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>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QGLColormap"></a>QGLColormap::QGLColormap ()
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</h3>
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Construct a QGLColormap.
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<h3 class=fn><a name="QGLColormap-2"></a>QGLColormap::QGLColormap ( const <a href="qglcolormap.html">QGLColormap</a> & map )
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</h3>
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Construct a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>map</em>.
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<h3 class=fn><a name="~QGLColormap"></a>QGLColormap::~QGLColormap ()
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</h3>
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Dereferences the QGLColormap and deletes it if this was the last
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reference to it.
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<h3 class=fn>void <a name="detach"></a>QGLColormap::detach ()
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</h3>
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Detaches this QGLColormap from the shared block.
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<h3 class=fn><a href="qcolor.html">QColor</a> <a name="entryColor"></a>QGLColormap::entryColor ( int idx ) const
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</h3>
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Returns the QRgb value in the colorcell with index <em>idx</em>.
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<h3 class=fn>QRgb <a name="entryRgb"></a>QGLColormap::entryRgb ( int idx ) const
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</h3>
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Returns the QRgb value in the colorcell with index <em>idx</em>.
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<h3 class=fn>int <a name="find"></a>QGLColormap::find ( QRgb color ) const
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</h3>
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Returns the index of the color <em>color</em>. If <em>color</em> is not in the
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map, -1 is returned.
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<h3 class=fn>int <a name="findNearest"></a>QGLColormap::findNearest ( QRgb color ) const
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</h3>
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Returns the index of the color that is the closest match to color
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<em>color</em>.
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<h3 class=fn>bool <a name="isEmpty"></a>QGLColormap::isEmpty () const
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</h3>
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Returns TRUE if the colormap is empty; otherwise returns FALSE. A
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colormap with no color values set is considered to be empty.
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<h3 class=fn><a href="qglcolormap.html">QGLColormap</a> & <a name="operator-eq"></a>QGLColormap::operator= ( const <a href="qglcolormap.html">QGLColormap</a> & map )
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</h3>
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Assign a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>map</em> to this QGLColormap.
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<h3 class=fn>void <a name="setEntries"></a>QGLColormap::setEntries ( int count, const QRgb * colors, int base = 0 )
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</h3>
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Set an array of cells in this colormap. <em>count</em> is the number of
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colors that should be set, <em>colors</em> is the array of colors, and
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<em>base</em> is the starting index.
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<h3 class=fn>void <a name="setEntry"></a>QGLColormap::setEntry ( int idx, QRgb color )
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</h3>
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Set cell at index <em>idx</em> in the colormap to color <em>color</em>.
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<h3 class=fn>void <a name="setEntry-2"></a>QGLColormap::setEntry ( int idx, const <a href="qcolor.html">QColor</a> & color )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Set the cell with index <em>idx</em> in the colormap to color <em>color</em>.
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<h3 class=fn>int <a name="size"></a>QGLColormap::size () const
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</h3>
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Returns the number of colorcells in the colormap.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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