内容

• 公共类型
• 公共函数
• 静态公共成员
• 详细描述

QColormap 类

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

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

• 所有成员列表，包括继承成员

公共类型

enum	Mode { Direct, Indexed, Gray }

公共函数

	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 )

静态公共成员

QColormap

instance (int screen = -1)

详细描述

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

成员类型文档编制

enum QColormap:: Mode

此枚举描述如何 QColormap maps device independent RGB values to device dependent pixel values.

常量	值	描述
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	类似于 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.

成员函数文档编制

QColormap:: QColormap (const QColormap & colormap )

构造副本为另一 colormap .

QColormap:: ~QColormap ()

销毁颜色映射。

const QColor QColormap:: colorAt ( uint pixel ) const

返回 QColor 为 pixel .

另请参阅 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 模式。

另请参阅 size ().

int QColormap:: depth () const

返回设备的深度。

另请参阅 size ().

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

返回颜色映射为指定 screen 。若 screen is -1, this function returns the colormap for the default screen.

QColormap::Mode QColormap:: mode () const

返回此颜色映射的模式。

另请参阅 QColormap::Mode .

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

返回设备从属像素值为 color .

另请参阅 colorAt ().

int QColormap:: size () const

返回颜色映射大小对于 Indexed and Gray 模式；返回 -1 对于 Direct 模式。

另请参阅 colormap ().

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

赋值给定 colormap to this color map and returns a reference to this color map.

该函数在 Qt 4.2 引入。