A null paint device that does nothing 更多...

#include <qwt_null_paintdevice.h>

类 QwtNullPaintDevice 继承关系图:

类
class	PaintEngine

class	PrivateData

Public 类型
enum	Mode { NormalMode , PolygonPathMode , PathMode }
	Render mode for the paint device 更多...

Public 成员函数
	QwtNullPaintDevice ()
	Constructor

	~QwtNullPaintDevice () override
	Destructor

void	setMode (Mode)
	Set the render mode

Mode	mode () const
	Get the render mode

virtual QPaintEngine *	paintEngine () const override
	Return the paint engine

virtual int	metric (PaintDeviceMetric) const override
	Return metric information for the paint device

virtual void	drawRects (const QRect *, int)
	Draw rectangles (integer version)

virtual void	drawRects (const QRectF *, int)
	Draw rectangles (floating point version)

virtual void	drawLines (const QLine *, int)
	Draw lines (integer version)

virtual void	drawLines (const QLineF *, int)
	Draw lines (floating point version)

virtual void	drawEllipse (const QRectF &)
	Draw ellipse (floating point version)

virtual void	drawEllipse (const QRect &)
	Draw ellipse (integer version)

virtual void	drawPath (const QPainterPath &)
	Draw a painter path

virtual void	drawPoints (const QPointF *, int)
	Draw points (floating point version)

virtual void	drawPoints (const QPoint *, int)
	Draw points (integer version)

virtual void	drawPolygon (const QPointF *, int, QPaintEngine::PolygonDrawMode)
	Draw polygon (floating point version)

virtual void	drawPolygon (const QPoint *, int, QPaintEngine::PolygonDrawMode)
	Draw polygon (integer version)

virtual void	drawPixmap (const QRectF &, const QPixmap &, const QRectF &)
	Draw a pixmap

virtual void	drawTextItem (const QPointF &, const QTextItem &)
	Draw a text item

virtual void	drawTiledPixmap (const QRectF &, const QPixmap &, const QPointF &)
	Draw a tiled pixmap

virtual void	drawImage (const QRectF &, const QImage &, const QRectF &, Qt::ImageConversionFlags)
	Draw an image

virtual void	updateState (const QPaintEngineState &)
	Update the paint engine state

Protected 成员函数
virtual QSize	sizeMetrics () const =0

详细描述

A null paint device that does nothing

Sometimes important layout/rendering geometries are not available or changeable from the public Qt class interface (e.g., hidden in the style implementation). QwtNullPaintDevice can be used to manipulate or filter out this information by analyzing the stream of paint primitives. For example, QwtNullPaintDevice is used by QwtPlotCanvas to identify styled backgrounds with rounded corners.

成员枚举类型说明

◆ Mode

enum QwtNullPaintDevice::Mode

Render mode for the paint device

Controls how vector graphic primitives are processed.

枚举值
NormalMode	All vector graphic primitives are painted by corresponding draw methods
PolygonPathMode	Vector graphic primitives (beside polygons) are mapped to QPainterPath
PathMode	All vector graphic primitives are mapped to QPainterPath

成员函数说明

◆ drawEllipse() [1/2]

void QwtNullPaintDevice::drawEllipse ( const QRect & rect )

virtual

Draw ellipse (integer version)

See QPaintEngine::drawEllipse()

◆ drawEllipse() [2/2]

void QwtNullPaintDevice::drawEllipse ( const QRectF & rect )

virtual

Draw ellipse (floating point version)

See QPaintEngine::drawEllipse()

◆ drawImage()

void QwtNullPaintDevice::drawImage	(	const QRectF &	rect,
		const QImage &	image,
		const QRectF &	subRect,
		Qt::ImageConversionFlags	flags
	)

virtual

Draw an image

See QPaintEngine::drawImage()

被 QwtGraphic 重载.

◆ drawLines() [1/2]

void QwtNullPaintDevice::drawLines	(	const QLine *	lines,
		int	lineCount
	)

virtual

Draw lines (integer version)

See QPaintEngine::drawLines()

◆ drawLines() [2/2]

void QwtNullPaintDevice::drawLines	(	const QLineF *	lines,
		int	lineCount
	)

virtual

Draw lines (floating point version)

See QPaintEngine::drawLines()

◆ drawPath()

void QwtNullPaintDevice::drawPath ( const QPainterPath & path )

virtual

Draw a painter path

See QPaintEngine::drawPath()

被 QwtGraphic , 以及 QwtStyleSheetRecorder 重载.

◆ drawPixmap()

void QwtNullPaintDevice::drawPixmap	(	const QRectF &	rect,
		const QPixmap &	pm,
		const QRectF &	subRect
	)

virtual

Draw a pixmap

See QPaintEngine::drawPixmap()

被 QwtGraphic 重载.

◆ drawPoints() [1/2]

void QwtNullPaintDevice::drawPoints	(	const QPoint *	points,
		int	pointCount
	)

virtual

Draw points (integer version)

See QPaintEngine::drawPoints()

◆ drawPoints() [2/2]

void QwtNullPaintDevice::drawPoints	(	const QPointF *	points,
		int	pointCount
	)

virtual

Draw points (floating point version)

See QPaintEngine::drawPoints()

◆ drawPolygon() [1/2]

void QwtNullPaintDevice::drawPolygon	(	const QPoint *	points,
		int	pointCount,
		QPaintEngine::PolygonDrawMode	mode
	)

virtual

Draw polygon (integer version)

See QPaintEngine::drawPolygon()

◆ drawPolygon() [2/2]

void QwtNullPaintDevice::drawPolygon	(	const QPointF *	points,
		int	pointCount,
		QPaintEngine::PolygonDrawMode	mode
	)

virtual

Draw polygon (floating point version)

See QPaintEngine::drawPolygon()

◆ drawRects() [1/2]

void QwtNullPaintDevice::drawRects	(	const QRect *	rects,
		int	rectCount
	)

virtual

Draw rectangles (integer version)

See QPaintEngine::drawRects()

被 QwtStyleSheetRecorder 重载.

◆ drawRects() [2/2]

void QwtNullPaintDevice::drawRects	(	const QRectF *	rects,
		int	rectCount
	)

virtual

Draw rectangles (floating point version)

See QPaintEngine::drawRects()

被 QwtStyleSheetRecorder 重载.

◆ drawTextItem()

void QwtNullPaintDevice::drawTextItem	(	const QPointF &	pos,
		const QTextItem &	textItem
	)

virtual

Draw a text item

See QPaintEngine::drawTextItem()

◆ drawTiledPixmap()

void QwtNullPaintDevice::drawTiledPixmap	(	const QRectF &	rect,
		const QPixmap &	pixmap,
		const QPointF &	subRect
	)

virtual

Draw a tiled pixmap

See QPaintEngine::drawTiledPixmap()

◆ metric()

int QwtNullPaintDevice::metric ( PaintDeviceMetric deviceMetric ) const

overridevirtual

Return metric information for the paint device

Returns information about the device metrics like width, height, DPI, etc. The actual size is determined by sizeMetrics().

参数

[in] deviceMetric Type of metric to query

返回: Metric value for the given paint device metric

◆ mode()

QwtNullPaintDevice::Mode QwtNullPaintDevice::mode ( ) const

Get the render mode

返回: Current render mode

◆ paintEngine()

QPaintEngine * QwtNullPaintDevice::paintEngine ( ) const

overridevirtual

Return the paint engine

Return the paint engine for this device

返回: Pointer to the paint engine, created on first call

◆ setMode()

void QwtNullPaintDevice::setMode ( Mode mode )

Set the render mode

参数

[in] mode New mode for the paint device

◆ sizeMetrics()

virtual QSize QwtNullPaintDevice::sizeMetrics ( ) const

protectedpure virtual

返回: Size needed to implement metric()

在 QwtGraphic , 以及 QwtStyleSheetRecorder 内被实现.

◆ updateState()

void QwtNullPaintDevice::updateState ( const QPaintEngineState & state )

virtual

Update the paint engine state

See QPaintEngine::updateState()

被 QwtGraphic , 以及 QwtStyleSheetRecorder 重载.

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_null_paintdevice.h
/home/runner/work/QWT/QWT/src/plot/qwt_null_paintdevice.cpp

类

Public 类型

Public 成员函数

Protected 成员函数

详细描述

成员枚举类型说明

◆ Mode

成员函数说明

◆ drawEllipse() [1/2]

◆ drawEllipse() [2/2]

◆ drawImage()

◆ drawLines() [1/2]

◆ drawLines() [2/2]

◆ drawPath()

◆ drawPixmap()

◆ drawPoints() [1/2]

◆ drawPoints() [2/2]

◆ drawPolygon() [1/2]

◆ drawPolygon() [2/2]

◆ drawRects() [1/2]

◆ drawRects() [2/2]

◆ drawTextItem()

◆ drawTiledPixmap()

◆ metric()

◆ mode()

◆ paintEngine()

◆ setMode()

◆ sizeMetrics()

◆ updateState()