QGLColormap Class

#include <QApplication>
#include <QGLColormap>

int main()
{
    QApplication app(argc, argv);

    MySuperGLWidget widget;     // 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 app.exec();
}

Member Function Documentation

QGLColormap::QGLColormap(const QGLColormap &map)

Construct a shallow copy of map.

QGLColormap::QGLColormap()

Construct a QGLColormap.

QGLColormap &QGLColormap::operator=(const QGLColormap &map)

Assign a shallow copy of map to this QGLColormap.

QGLColormap::~QGLColormap()

Dereferences the QGLColormap and deletes it if this was the last reference to it.

QColor QGLColormap::entryColor(int idx) const

Returns the QRgb value in the colorcell with index idx.

QRgb QGLColormap::entryRgb(int idx) const

Returns the QRgb value in the colorcell with index idx.

int QGLColormap::find(QRgb color) const

Returns the index of the color color. If color is not in the map, -1 is returned.

int QGLColormap::findNearest(QRgb color) const

Returns the index of the color that is the closest match to color color.

bool QGLColormap::isEmpty() const

Returns true if the colormap is empty or it is not in use by a QGLWidget; otherwise returns 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 QGLWidget is also considered empty.

Compare size() with zero to determine if the colormap is empty regardless of whether it is in use by a QGLWidget or not.

See also size().

void QGLColormap::setEntries(int count, const QRgb *colors, int base = 0)

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. The first element in colors is set at base in the colormap.

void QGLColormap::setEntry(int idx, QRgb color)

Set cell at index idx in the colormap to color color.

void QGLColormap::setEntry(int idx, const QColor &color)

This is an overloaded function.

Set the cell with index idx in the colormap to color color.

int QGLColormap::size() const

Returns the number of colorcells in the colormap.