A paint device for scalable graphics. More...

#include <qwt_graphic.h>

Inheritance diagram for QwtGraphic:

Classes
class	PathInfo

class	PrivateData

Public Types
enum	RenderHint { RenderPensUnscaled = 0x1 }
	Hint how to render a graphic . More...

enum	CommandType { VectorData = 1 << 0 , RasterData = 1 << 1 , Transformation = 1 << 2 }
	Indicator if the graphic contains a specific type of painter command . More...

Public Types inherited from QwtNullPaintDevice
enum	Mode { NormalMode , PolygonPathMode , PathMode }
	Render mode for the paint device. More...

Public Member Functions
	QwtGraphic ()
	Constructor.

	QwtGraphic (const QwtGraphic &)
	Copy constructor.

virtual	~QwtGraphic ()
	Destructor.

QwtGraphic &	operator= (const QwtGraphic &)
	Assignment operator.

void	reset ()
	Clear all stored commands.

bool	isNull () const
	Check if the graphic is null.

bool	isEmpty () const
	Check if the graphic is empty.

CommandTypes	commandTypes () const
	Get the types of painter commands being used.

void	render (QPainter *) const
	Replay all recorded painter commands.

void	render (QPainter *, const QSizeF &, Qt::AspectRatioMode=Qt::IgnoreAspectRatio) const
	Replay all recorded painter commands scaled to fit into given size.

void	render (QPainter *, const QPointF &, Qt::Alignment=Qt::AlignTop\|Qt::AlignLeft) const
	Replay all recorded painter commands aligned to a position.

void	render (QPainter *, const QRectF &, Qt::AspectRatioMode=Qt::IgnoreAspectRatio) const
	Replay all recorded painter commands scaled to fit into given rectangle.

QPixmap	toPixmap (qreal devicePixelRatio=0.0) const
	Convert the graphic to a QPixmap in default size.

QPixmap	toPixmap (const QSize &, Qt::AspectRatioMode=Qt::IgnoreAspectRatio, qreal devicePixelRatio=0.0) const
	Convert the graphic to a QPixmap with specified size.

QImage	toImage (qreal devicePixelRatio=0.0) const
	Convert the graphic to a QImage in default size.

QImage	toImage (const QSize &, Qt::AspectRatioMode=Qt::IgnoreAspectRatio, qreal devicePixelRatio=0.0) const
	Convert the graphic to a QImage with specified size.

QRectF	scaledBoundingRect (qreal sx, qreal sy) const
	Calculate the target rectangle for scaling the graphic.

QRectF	boundingRect () const
	Get the bounding rectangle.

QRectF	controlPointRect () const
	Get the control point rectangle.

const QVector< QwtPainterCommand > &	commands () const
	Get the list of recorded paint commands.

void	setCommands (const QVector< QwtPainterCommand > &)
	Append paint commands.

void	setDefaultSize (const QSizeF &)
	Set a default size.

QSizeF	defaultSize () const
	Get the default size.

qreal	heightForWidth (qreal width) const
	Find the height for a given width.

qreal	widthForHeight (qreal height) const
	Find the width for a given height.

void	setRenderHint (RenderHint, bool on=true)
	Toggle a render hint.

bool	testRenderHint (RenderHint) const
	Test a render hint.

RenderHints	renderHints () const
	Get the render hints.

Public Member Functions inherited from QwtNullPaintDevice
	QwtNullPaintDevice ()
	Constructor.

virtual	~QwtNullPaintDevice ()
	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	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	drawTextItem (const QPointF &, const QTextItem &)
	Draw a text item.

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

Protected Member Functions
virtual QSize	sizeMetrics () const override

virtual void	drawPath (const QPainterPath &) override
	Store a path command in the command list.

virtual void	drawPixmap (const QRectF &, const QPixmap &, const QRectF &) override
	Store a pixmap command in the command list.

virtual void	drawImage (const QRectF &, const QImage &, const QRectF &, Qt::ImageConversionFlags) override
	Store a image command in the command list.

virtual void	updateState (const QPaintEngineState &) override
	Store a state command in the command list.

Detailed Description

A paint device for scalable graphics.

Member Enumeration Documentation

◆ CommandType

enum QwtGraphic::CommandType

Indicator if the graphic contains a specific type of painter command .

Enumerator
VectorData	The graphic contains scalable vector data
RasterData	The graphic contains raster data ( QPixmap or QImage )
Transformation	The graphic contains transformations beyond simple translations

◆ RenderHint

enum QwtGraphic::RenderHint

Hint how to render a graphic .

Enumerator

RenderPensUnscaled

When rendering a QwtGraphic a specific scaling between the controlPointRect() and the coordinates of the target rectangle is set up internally in render().

When RenderPensUnscaled is set this specific scaling is applied for the control points only, but not for the pens. All other painter transformations ( set up by application code ) are supposed to work like usual.

Constructor & Destructor Documentation

◆ QwtGraphic() [1/2]

QwtGraphic::QwtGraphic ( )

Constructor.

◆ QwtGraphic() [2/2]

QwtGraphic::QwtGraphic ( const QwtGraphic & other )

Copy constructor.

◆ ~QwtGraphic()

QwtGraphic::~QwtGraphic ( )

virtual

Destructor.

Member Function Documentation

◆ boundingRect()

QRectF QwtGraphic::boundingRect ( ) const

Get the bounding rectangle.

◆ commands()

const QVector< QwtPainterCommand > & QwtGraphic::commands ( ) const

Get the list of recorded paint commands.

◆ commandTypes()

QwtGraphic::CommandTypes QwtGraphic::commandTypes ( ) const

Get the types of painter commands being used.

◆ controlPointRect()

QRectF QwtGraphic::controlPointRect ( ) const

Get the control point rectangle.

◆ defaultSize()

QSizeF QwtGraphic::defaultSize ( ) const

Get the default size.

◆ drawImage()

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

overrideprotectedvirtual

Store a image command in the command list.

Parameters

rect	target rectangle
image	Image to be painted
subRect	Reactangle of the pixmap to be painted
flags	Image conversion flags

See also: QPaintEngine::drawImage()

Reimplemented from QwtNullPaintDevice.

◆ drawPath()

void QwtGraphic::drawPath ( const QPainterPath & path )

overrideprotectedvirtual

Store a path command in the command list.

Parameters

path	Painter path

See also: QPaintEngine::drawPath()

Reimplemented from QwtNullPaintDevice.

◆ drawPixmap()

void QwtGraphic::drawPixmap	(	const QRectF &	rect,
		const QPixmap &	pixmap,
		const QRectF &	subRect
	)

overrideprotectedvirtual

Store a pixmap command in the command list.

Parameters

rect	target rectangle
pixmap	Pixmap to be painted
subRect	Reactangle of the pixmap to be painted

See also: QPaintEngine::drawPixmap()

Reimplemented from QwtNullPaintDevice.

◆ heightForWidth()

qreal QwtGraphic::heightForWidth ( qreal width ) const

Find the height for a given width.

◆ isEmpty()

bool QwtGraphic::isEmpty ( ) const

Check if the graphic is empty.

◆ isNull()

bool QwtGraphic::isNull ( ) const

Check if the graphic is null.

◆ operator=()

QwtGraphic & QwtGraphic::operator= ( const QwtGraphic & other )

Assignment operator.

◆ render() [1/4]

void QwtGraphic::render ( QPainter * painter ) const

Replay all recorded painter commands.

◆ render() [2/4]

void QwtGraphic::render	(	QPainter *	painter,
		const QPointF &	pos,
		Qt::Alignment	alignment = `Qt::AlignTop \| Qt::AlignLeft`
	)		const

Replay all recorded painter commands aligned to a position.

◆ render() [3/4]

void QwtGraphic::render	(	QPainter *	painter,
		const QRectF &	rect,
		Qt::AspectRatioMode	aspectRatioMode = `Qt::IgnoreAspectRatio`
	)		const

Replay all recorded painter commands scaled to fit into given rectangle.

◆ render() [4/4]

void QwtGraphic::render	(	QPainter *	painter,
		const QSizeF &	size,
		Qt::AspectRatioMode	aspectRatioMode = `Qt::IgnoreAspectRatio`
	)		const

Replay all recorded painter commands scaled to fit into given size.

◆ renderHints()

QwtGraphic::RenderHints QwtGraphic::renderHints ( ) const

Get the render hints.

◆ reset()

void QwtGraphic::reset ( )

Clear all stored commands.

◆ scaledBoundingRect()

QRectF QwtGraphic::scaledBoundingRect	(	qreal	sx,
		qreal	sy
	)		const

Calculate the target rectangle for scaling the graphic.

◆ setCommands()

void QwtGraphic::setCommands ( const QVector< QwtPainterCommand > & commands )

Append paint commands.

◆ setDefaultSize()

void QwtGraphic::setDefaultSize ( const QSizeF & size )

Set a default size.

◆ setRenderHint()

void QwtGraphic::setRenderHint	(	RenderHint	hint,
		bool	on = `true`
	)

Toggle a render hint.

◆ sizeMetrics()

QSize QwtGraphic::sizeMetrics ( ) const

overrideprotectedvirtual

Returns: Ceiled defaultSize()

Implements QwtNullPaintDevice.

◆ testRenderHint()

bool QwtGraphic::testRenderHint ( RenderHint hint ) const

Test a render hint.

◆ toImage() [1/2]

QImage QwtGraphic::toImage	(	const QSize &	size,
		Qt::AspectRatioMode	aspectRatioMode = `Qt::IgnoreAspectRatio`,
		qreal	devicePixelRatio = `0.0`
	)		const

Convert the graphic to a QImage with specified size.

◆ toImage() [2/2]

QImage QwtGraphic::toImage ( qreal devicePixelRatio = 0.0 ) const

Convert the graphic to a QImage in default size.

◆ toPixmap() [1/2]

QPixmap QwtGraphic::toPixmap	(	const QSize &	size,
		Qt::AspectRatioMode	aspectRatioMode = `Qt::IgnoreAspectRatio`,
		qreal	devicePixelRatio = `0.0`
	)		const

Convert the graphic to a QPixmap with specified size.

◆ toPixmap() [2/2]

QPixmap QwtGraphic::toPixmap ( qreal devicePixelRatio = 0.0 ) const

Convert the graphic to a QPixmap in default size.

◆ updateState()

void QwtGraphic::updateState ( const QPaintEngineState & state )

overrideprotectedvirtual

Store a state command in the command list.

Parameters

state State to be stored

See also: QPaintEngine::updateState()

Reimplemented from QwtNullPaintDevice.

◆ widthForHeight()

qreal QwtGraphic::widthForHeight ( qreal height ) const

Find the width for a given height.

The documentation for this class was generated from the following files:

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

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ CommandType

◆ RenderHint

Constructor & Destructor Documentation

◆ QwtGraphic() [1/2]

◆ QwtGraphic() [2/2]

◆ ~QwtGraphic()

Member Function Documentation

◆ boundingRect()

◆ commands()

◆ commandTypes()

◆ controlPointRect()

◆ defaultSize()

◆ drawImage()

◆ drawPath()

◆ drawPixmap()

◆ heightForWidth()

◆ isEmpty()

◆ isNull()

◆ operator=()

◆ render() [1/4]

◆ render() [2/4]

◆ render() [3/4]

◆ render() [4/4]

◆ renderHints()

◆ reset()

◆ scaledBoundingRect()

◆ setCommands()

◆ setDefaultSize()

◆ setRenderHint()

◆ sizeMetrics()

◆ testRenderHint()

◆ toImage() [1/2]

◆ toImage() [2/2]

◆ toPixmap() [1/2]

◆ toPixmap() [2/2]

◆ updateState()

◆ widthForHeight()