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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 > TQGLColormap Class Reference< br > < small > [< a href = "opengl.html" > OpenGL module< / a > ]< / small > < / h1 >
< p > The TQGLColormap class is used for installing custom colormaps into
TQGLWidgets.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qglcolormap-h.html" > ntqglcolormap.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 = "#TQGLColormap" > < b > TQGLColormap< / b > < / a > ()< / li >
< li class = fn > < a href = "#TQGLColormap-2" > < b > TQGLColormap< / b > < / a > ( const TQGLColormap & map )< / li >
< li class = fn > < a href = "#~TQGLColormap" > < b > ~TQGLColormap< / b > < / a > ()< / li >
< li class = fn > TQGLColormap & < a href = "#operator-eq" > < b > operator=< / b > < / a > ( const TQGLColormap & 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 TQRgb * colors, int base = 0 )< / li >
< li class = fn > void < a href = "#setEntry" > < b > setEntry< / b > < / a > ( int idx, TQRgb color )< / li >
< li class = fn > void < a href = "#setEntry-2" > < b > setEntry< / b > < / a > ( int idx, const TQColor & color )< / li >
< li class = fn > TQRgb < a href = "#entryRgb" > < b > entryRgb< / b > < / a > ( int idx ) const< / li >
< li class = fn > TQColor < a href = "#entryColor" > < b > entryColor< / b > < / a > ( int idx ) const< / li >
< li class = fn > int < a href = "#find" > < b > find< / b > < / a > ( TQRgb color ) const< / li >
< li class = fn > int < a href = "#findNearest" > < b > findNearest< / b > < / a > ( TQRgb color ) const< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQGLColormap class is used for installing custom colormaps into
TQGLWidgets.
< p >
< p > TQGLColormap provides a platform independent way of specifying and
installing indexed colormaps into TQGLWidgets. TQGLColormap 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" > ntqapplication.h< / a > >
#include < < a href = "qglcolormap-h.html" > ntqglcolormap.h< / a > >
int main()
{
< a href = "ntqapplication.html" > TQApplication< / a > a( argc, argv );
MySuperGLWidget widget( 0 ); // A TQGLWidget in color-index mode
TQGLColormap 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, tqRgb( i, i, i ) );
widget.setColormap( colormap );
widget.show();
return a.< a href = "ntqapplication.html#exec" > exec< / a > ();
}
< / pre >
< p > < p > See also < a href = "qglwidget.html#setColormap" > TQGLWidget::setColormap< / a > (), < a href = "qglwidget.html#colormap" > TQGLWidget::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 = "TQGLColormap" > < / a > TQGLColormap::TQGLColormap ()
< / h3 >
Construct a TQGLColormap.
< h3 class = fn > < a name = "TQGLColormap-2" > < / a > TQGLColormap::TQGLColormap ( const < a href = "ntqglcolormap.html" > TQGLColormap< / a > & map )
< / h3 >
Construct a < a href = "shclass.html#shallow-copy" > shallow copy< / a > of < em > map< / em > .
< h3 class = fn > < a name = "~TQGLColormap" > < / a > TQGLColormap::~TQGLColormap ()
< / h3 >
Dereferences the TQGLColormap and deletes it if this was the last
reference to it.
< h3 class = fn > void < a name = "detach" > < / a > TQGLColormap::detach ()
< / h3 >
Detaches this TQGLColormap from the shared block.
< h3 class = fn > < a href = "ntqcolor.html" > TQColor< / a > < a name = "entryColor" > < / a > TQGLColormap::entryColor ( int idx ) const
< / h3 >
Returns the TQRgb value in the colorcell with index < em > idx< / em > .
< h3 class = fn > TQRgb < a name = "entryRgb" > < / a > TQGLColormap::entryRgb ( int idx ) const
< / h3 >
Returns the TQRgb value in the colorcell with index < em > idx< / em > .
< h3 class = fn > int < a name = "find" > < / a > TQGLColormap::find ( TQRgb 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 > TQGLColormap::findNearest ( TQRgb 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 > TQGLColormap::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 = "ntqglcolormap.html" > TQGLColormap< / a > & < a name = "operator-eq" > < / a > TQGLColormap::operator= ( const < a href = "ntqglcolormap.html" > TQGLColormap< / a > & map )
< / h3 >
Assign a < a href = "shclass.html#shallow-copy" > shallow copy< / a > of < em > map< / em > to this TQGLColormap.
< h3 class = fn > void < a name = "setEntries" > < / a > TQGLColormap::setEntries ( int count, const TQRgb * 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 > TQGLColormap::setEntry ( int idx, TQRgb 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 > TQGLColormap::setEntry ( int idx, const < a href = "ntqcolor.html" > TQColor< / 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 > TQGLColormap::size () const
< / h3 >
Returns the number of colorcells in the colormap.
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