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) | |
| ~QColormap() | |
| const QColor | colorAt(uint pixel) const |
| const QVector<QColor> | colormap() const |
| int | depth() const |
| 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.
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.