QColormap Class

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

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

List of all members, including inherited members

Public Types

enum	Mode { Direct, Indexed, Gray }

Public Functions

	QColormap(const QColormap &colormap)
	~QColormap()
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.

QColormap::~QColormap()

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.

Contents