diff options
Diffstat (limited to 'doc/man/man3/qglcolormap.3qt')
| -rw-r--r-- | doc/man/man3/qglcolormap.3qt | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/doc/man/man3/qglcolormap.3qt b/doc/man/man3/qglcolormap.3qt new file mode 100644 index 0000000..f1a551d --- /dev/null +++ b/doc/man/man3/qglcolormap.3qt @@ -0,0 +1,166 @@ +'\" t +.TH QGLColormap 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*- +.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the +.\" license file included in the distribution for a complete license +.\" statement. +.\" +.ad l +.nh +.SH NAME +QGLColormap \- Used for installing custom colormaps into QGLWidgets +.SH SYNOPSIS +\fC#include <qglcolormap.h>\fR +.PP +.SS "Public Members" +.in +1c +.ti -1c +.BI "\fBQGLColormap\fR ()" +.br +.ti -1c +.BI "\fBQGLColormap\fR ( const QGLColormap & map )" +.br +.ti -1c +.BI "\fB~QGLColormap\fR ()" +.br +.ti -1c +.BI "QGLColormap & \fBoperator=\fR ( const QGLColormap & map )" +.br +.ti -1c +.BI "bool \fBisEmpty\fR () const" +.br +.ti -1c +.BI "int \fBsize\fR () const" +.br +.ti -1c +.BI "void \fBdetach\fR ()" +.br +.ti -1c +.BI "void \fBsetEntries\fR ( int count, const QRgb * colors, int base = 0 )" +.br +.ti -1c +.BI "void \fBsetEntry\fR ( int idx, QRgb color )" +.br +.ti -1c +.BI "void \fBsetEntry\fR ( int idx, const QColor & color )" +.br +.ti -1c +.BI "QRgb \fBentryRgb\fR ( int idx ) const" +.br +.ti -1c +.BI "QColor \fBentryColor\fR ( int idx ) const" +.br +.ti -1c +.BI "int \fBfind\fR ( QRgb color ) const" +.br +.ti -1c +.BI "int \fBfindNearest\fR ( QRgb color ) const" +.br +.in -1c +.SH DESCRIPTION +The QGLColormap class is used for installing custom colormaps into QGLWidgets. +.PP +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. +.PP +Under X11 you must use an X server that supports either a \fCPseudoColor\fR or \fCDirectColor\fR visual class. If your X server currently only provides a \fCGrayScale\fR, \fCTrueColor\fR, \fCStaticColor\fR or \fCStaticGray\fR 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 \fCPseudoColor\fR visual. Note that you may experience colormap flashing if your X server is running in 8 bit mode. +.PP +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. +.PP +This class uses explicit sharing (see Shared Classes). +.PP +Example of use: +.PP +.nf +.br + #include <qapplication.h> +.br + #include <qglcolormap.h> +.br +.br + int main() +.br + { +.br + QApplication a( argc, argv ); +.br +.br + MySuperGLWidget widget( 0 ); // A QGLWidget in color-index mode +.br + QGLColormap colormap; +.br +.br + // This will fill the colormap with colors ranging from +.br + // black to white. +.br + for ( int i = 0; i < colormap.size(); i++ ) +.br + colormap.setEntry( i, qRgb( i, i, i ) ); +.br +.br + widget.setColormap( colormap ); +.br + widget.show(); +.br + return a.exec(); +.br + } +.br +.fi +.PP +See also QGLWidget::setColormap(), QGLWidget::colormap(), Graphics Classes, and Image Processing Classes. +.SH MEMBER FUNCTION DOCUMENTATION +.SH "QGLColormap::QGLColormap ()" +Construct a QGLColormap. +.SH "QGLColormap::QGLColormap ( const QGLColormap & map )" +Construct a shallow copy of \fImap\fR. +.SH "QGLColormap::~QGLColormap ()" +Dereferences the QGLColormap and deletes it if this was the last reference to it. +.SH "void QGLColormap::detach ()" +Detaches this QGLColormap from the shared block. +.SH "QColor QGLColormap::entryColor ( int idx ) const" +Returns the QRgb value in the colorcell with index \fIidx\fR. +.SH "QRgb QGLColormap::entryRgb ( int idx ) const" +Returns the QRgb value in the colorcell with index \fIidx\fR. +.SH "int QGLColormap::find ( QRgb color ) const" +Returns the index of the color \fIcolor\fR. If \fIcolor\fR is not in the map, -1 is returned. +.SH "int QGLColormap::findNearest ( QRgb color ) const" +Returns the index of the color that is the closest match to color \fIcolor\fR. +.SH "bool QGLColormap::isEmpty () const" +Returns TRUE if the colormap is empty; otherwise returns FALSE. A colormap with no color values set is considered to be empty. +.SH "QGLColormap & QGLColormap::operator= ( const QGLColormap & map )" +Assign a shallow copy of \fImap\fR to this QGLColormap. +.SH "void QGLColormap::setEntries ( int count, const QRgb * colors, int base = 0 )" +Set an array of cells in this colormap. \fIcount\fR is the number of colors that should be set, \fIcolors\fR is the array of colors, and \fIbase\fR is the starting index. +.SH "void QGLColormap::setEntry ( int idx, QRgb color )" +Set cell at index \fIidx\fR in the colormap to color \fIcolor\fR. +.SH "void QGLColormap::setEntry ( int idx, const QColor & color )" +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +.PP +Set the cell with index \fIidx\fR in the colormap to color \fIcolor\fR. +.SH "int QGLColormap::size () const" +Returns the number of colorcells in the colormap. + +.SH "SEE ALSO" +.BR http://doc.trolltech.com/qglcolormap.html +.BR http://www.trolltech.com/faq/tech.html +.SH COPYRIGHT +Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the +license file included in the distribution for a complete license +statement. +.SH AUTHOR +Generated automatically from the source code. +.SH BUGS +If you find a bug in Qt, please report it as described in +.BR http://doc.trolltech.com/bughowto.html . +Good bug reports help us to help you. Thank you. +.P +The definitive Qt documentation is provided in HTML format; it is +located at $QTDIR/doc/html and can be read using Qt Assistant or with +a web browser. This man page is provided as a convenience for those +users who prefer man pages, although this format is not officially +supported by Trolltech. +.P +If you find errors in this manual page, please report them to +.BR [email protected] . +Please include the name of the manual page (qglcolormap.3qt) and the Qt +version (3.3.8). |