PySide.QtOpenGL.QGLColormap class is used for installing custom colormaps into a PySide.QtOpenGL.QGLWidget .
PySide.QtOpenGL.QGLColormap provides a platform independent way of specifying and installing indexed colormaps for a PySide.QtOpenGL.QGLWidget . PySide.QtOpenGL.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.
PySide.QtOpenGL.QGLColormap.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 隐式共享 as a memory and speed optimization.
用法范例：
import sys
from PySide.QtGui import QApplication, qRgb
from PySide.QtOpenGL import QGLColormap
def main(argv):
app = QApplication(argv)
widget = MySuperGLWidget() # a QGLWidget in color-index mode
colormap = QGLColormap()
# This will fill the colormap with colors ranging from
# black to white.
for i in range(0, colormap.size()):
colormap.setEntry(i, qRgb(i, i, i))
widget.setColormap(colormap)
widget.show()
return app.exec_()
if __name__ == "__main__":
main(sys.argv)
| 参数： | arg__1 – PySide.QtOpenGL.QGLColormap |
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构造 PySide.QtOpenGL.QGLColormap .
Construct a shallow copy of map .
| 参数： | idx – PySide.QtCore.int |
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| 返回类型： | PySide.QtGui.QColor |
返回 QRgb value in the colorcell with index idx .
| 参数： | idx – PySide.QtCore.int |
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| 返回类型： | long |
返回 QRgb value in the colorcell with index idx .
| 参数： | color – long |
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| 返回类型： | PySide.QtCore.int |
| 参数： | color – long |
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| 返回类型： | PySide.QtCore.int |
| 返回类型： | PySide.QtCore.Qt::HANDLE |
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Returns the handle for this color map.
| 返回类型： | PySide.QtCore.bool |
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Returns true if the colormap is empty or it is not in use by a PySide.QtOpenGL.QGLWidget ；否则返回 false。
A colormap with no color values set is considered to be empty. For historical reasons, a colormap that has color values set but which is not in use by a PySide.QtOpenGL.QGLWidget is also considered empty.
比较 PySide.QtOpenGL.QGLColormap.size() with zero to determine if the colormap is empty regardless of whether it is in use by a PySide.QtOpenGL.QGLWidget or not.
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这是重载函数。
Set the cell with index idx in the colormap to color color .
| 参数： | ahandle – PySide.QtCore.Qt::HANDLE |
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| 返回类型： | PySide.QtCore.int |
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Returns the number of colorcells in the colormap.