QPaintedTextureImage Class

class Qt3DRender ::QPaintedTextureImage

A QAbstractTextureImage that can be written through a QPainter . 更多...

头：	#include <QPaintedTextureImage>
qmake:	QT += 3drender
Since:	Qt 5.8
继承：	Qt3DRender::QAbstractTextureImage

该类在 Qt 5.8 引入。

• 所有成员列表，包括继承成员

特性

• height : int
• size : QSize
• width : int

公共函数

int	height () const
QSize	size () const
void	update (const QRect & rect = QRect())
int	width () const

公共槽

void	setHeight (int h )
void	setSize (QSize size )
void	setWidth (int w )

信号

void	heightChanged (int w )
void	sizeChanged (QSize size )
void	widthChanged (int w )

保护函数

virtual void

paint (QPainter * painter ) = 0

详细描述

A QPaintedTextureImage provides a way to specify a texture image (and thus an OpenGL texture) through a QPainter . The width and height of the texture image can be specified through the width and height or size properties.

A QPaintedTextureImage must be subclassed and the virtual paint () function implemented. Each time update () is called on the QPaintedTextureImage, the paint () function is invoked and the resulting image is uploaded.

The QPaintedTextureImage must be attached to some QAbstractTexture .

特性文档编制

height : int

This property holds the height of the texture image. The height must be greater than or equal to 1.

访问函数：

int	height () const
void	setHeight (int h )

通知程序信号：

void	heightChanged (int w )

size : QSize

This property holds the size of the texture image.

访问函数：

QSize	size () const
void	setSize (QSize size )

通知程序信号：

void	sizeChanged (QSize size )

另请参阅 height and width .

width : int

This property holds the width of the texture image. The width must be greater than or equal to 1.

访问函数：

int	width () const
void	setWidth (int w )

通知程序信号：

void	widthChanged (int w )

成员函数文档编制

[slot] void QPaintedTextureImage:: setHeight ( int h )

Sets the height ( h ) of the texture image. Triggers an update, if the size changes.

注意： setter 函数对于特性 height .

另请参阅 height ().

[slot] void QPaintedTextureImage:: setSize ( QSize size )

Sets the width and height of the texture image. Triggers an update, if the size 改变。

注意： setter 函数对于特性 size .

另请参阅 size ().

[slot] void QPaintedTextureImage:: setWidth ( int w )

Sets the width ( w ) of the texture image. Triggers an update, if the size changes.

注意： setter 函数对于特性 width .

另请参阅 width ().

[pure virtual protected] void QPaintedTextureImage:: paint ( QPainter * painter )

Paints the texture image with the specified QPainter 对象 painter .

QPainter considers the top-left corner of an image as its origin, while OpenGL considers the bottom-left corner of a texture as its origin. An easy way to account for this difference is to set a custom viewport on the painter before doing any other painting:

painter->setViewport(0, height(), width(), -height());
...
					

void QPaintedTextureImage:: update (const QRect & rect = QRect())

Immediately triggers the painted texture's paint () function, which in turn uploads the new image to the GPU. If you are making multiple changes to a painted texture, consider waiting until all changes are complete before calling update, in order to minimize the number of repaints required.

参数 rect is currently unused.

内容

• 特性

• 公共函数

• 公共槽

• 信号

• 保护函数

• 详细描述