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The QGLColormap class is used for installing custom colormaps into QGLWidgets. More...
#include <QGLColormap>
The QGLColormap class is used for installing custom colormaps into QGLWidgets.
QGLColormap provides a platform independent way of specifying and installing indexed colormaps into QGLWidgets. QGLColormap is especially useful when using the OpenGL color-index mode.
Under X11 you must use an X server that supports either a PseudoColor or DirectColor visual class. If your X server currently only provides a GrayScale, TrueColor, StaticColor or StaticGray 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 PseudoColor visual. Note that you may experience colormap flashing if your X server is running in 8 bit mode.
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.
This class uses explicit sharing (see Shared Classes).
Example of use:
#include <qapplication.h> #include <qglcolormap.h> int main() { QApplication 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.size(); i++) colormap.setEntry(i, qRgb(i, i, i)); widget.setColormap(colormap); widget.show(); return a.exec(); }
See also QGLWidget::setColormap() and QGLWidget::colormap().
Construct a QGLColormap.
Construct a shallow copy of map.
Dereferences the QGLColormap and deletes it if this was the last reference to it.
Detaches this QGLColormap from the shared block.
Returns the QRgb value in the colorcell with index idx.
Returns the QRgb value in the colorcell with index idx.
Returns the index of the color color. If color is not in the map, -1 is returned.
Returns the index of the color that is the closest match to color color.
Returns true if the colormap is empty; otherwise returns false. A colormap with no color values set is considered to be empty.
Set an array of cells in this colormap. count is the number of colors that should be set, colors is the array of colors, and base is the starting index.
Set cell at index idx in the colormap to color color.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Set the cell with index idx in the colormap to color color.
Returns the number of colorcells in the colormap.
Assign a shallow copy of map to this QGLColormap.
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