Tour Preview

Find the Best Demos and Examples

Check out this quick tour to find the best demos and examples for you, and to see how the Felgo SDK can help you to develop your next app or game!

QColormap Class

The QColormap class maps device independent QColors to device dependent pixel values. More...

Header: #include <QColormap>
qmake: QT += widgets

Public Types

enum Mode { Direct, Indexed, Gray }

Public Functions

QColormap(const QColormap &colormap)
const QColor colorAt(uint pixel) const
const QVector<QColor> colormap() const
int depth() const
QColormap::Mode mode() const
uint pixel(const QColor &color) const
int size() const
QColormap & operator=(const QColormap &colormap)

Static Public Members

QColormap instance(int screen = -1)

Detailed Description

The QColormap class maps device independent QColors to device dependent pixel values.

Member Type Documentation

enum QColormap::Mode

This enum describes how QColormap maps device independent RGB values to device dependent pixel values.

Constant Value Description
QColormap::Direct 0 Pixel values are derived directly from the RGB values, also known as "True Color."
QColormap::Indexed 1 Pixel values represent indexes into a vector of available colors, i.e. QColormap uses the index of the color that most closely matches an RGB value.
QColormap::Gray 2 Similar to Indexed, pixel values represent a vector of available gray tones. QColormap uses the index of the gray tone that most closely matches the computed gray tone of an RGB value.

Member Function Documentation

QColormap::QColormap(const QColormap &colormap)

Constructs a copy of another colormap.


Destroys the colormap.

const QColor QColormap::colorAt(uint pixel) const

Returns a QColor for the pixel.

See also pixel().

const QVector<QColor> QColormap::colormap() const

Returns a vector of colors which represents the devices colormap for Indexed and Gray modes. This function returns an empty vector for Direct mode.

See also size().

int QColormap::depth() const

Returns the depth of the device.

See also size().

[static] QColormap QColormap::instance(int screen = -1)

Returns the colormap for the specified screen. If screen is -1, this function returns the colormap for the default screen.

QColormap::Mode QColormap::mode() const

Returns the mode of this colormap.

See also QColormap::Mode.

uint QColormap::pixel(const QColor &color) const

Returns a device dependent pixel value for the color.

See also colorAt().

int QColormap::size() const

Returns the size of the colormap for Indexed and Gray modes; Returns -1 for Direct mode.

See also colormap().

QColormap &QColormap::operator=(const QColormap &colormap)

Assigns the given colormap to this color map and returns a reference to this color map.

This function was introduced in Qt 4.2.