QwtPolarCanvas Class Reference

Canvas of a QwtPolarPlot. More...

#include <qwt_polar_canvas.h>

Inheritance diagram for QwtPolarCanvas:

Public Types
enum	PaintAttribute { BackingStore = 0x01 }
	Paint attributes. More...
typedef QFlags< PaintAttribute >	PaintAttributes
	Paint attributes.

Public Member Functions
	QwtPolarCanvas (QwtPolarPlot *)
	Constructor.
virtual	~QwtPolarCanvas ()
	Destructor.
QwtPolarPlot *	plot ()
const QwtPolarPlot *	plot () const
void	setPaintAttribute (PaintAttribute, bool on=true)
	Changing the paint attributes. More...
bool	testPaintAttribute (PaintAttribute) const
const QPixmap *	backingStore () const
void	invalidateBackingStore ()
	Invalidate the internal backing store.
QwtPointPolar	invTransform (const QPoint &) const
QPoint	transform (const QwtPointPolar &) const

Protected Member Functions
virtual void	paintEvent (QPaintEvent *)
virtual void	resizeEvent (QResizeEvent *)

Detailed Description

Canvas of a QwtPolarPlot.

The canvas is the widget, where all polar items are painted to.

Note

In opposite to QwtPlot all axes are painted on the canvas.

See Also

QwtPolarPlot

Member Enumeration Documentation

enum QwtPolarCanvas::PaintAttribute

Paint attributes.

The default setting enables BackingStore

See Also

setPaintAttribute(), testPaintAttribute(), backingStore()

Enumerator
BackingStore	Paint double buffered and reuse the content of the pixmap buffer for some spontaneous repaints that happen when a plot gets unhidden, deiconified or changes the focus.

Member Function Documentation

const QPixmap * QwtPolarCanvas::backingStore

(

)

const

Returns

Backing store, might be null

QwtPointPolar QwtPolarCanvas::invTransform

(

const QPoint &

pos

)

const

Translate a point from widget into plot coordinates

Parameters

pos	Point in widget coordinates of the plot canvas

Returns

Point in plot coordinates

See Also

transform()

void QwtPolarCanvas::paintEvent ( QPaintEvent *  event )

protectedvirtual

Paint event

Parameters

event

Paint event

QwtPolarPlot * QwtPolarCanvas::plot

(

)

Returns

Parent plot widget

const QwtPolarPlot * QwtPolarCanvas::plot

(

)

const

Returns

Parent plot widget

void QwtPolarCanvas::resizeEvent ( QResizeEvent *  event )

protectedvirtual

Resize event

Parameters

event

Resize event

void QwtPolarCanvas::setPaintAttribute	(	PaintAttribute	attribute,
		bool	on = true
	)

Changing the paint attributes.

Parameters

attribute	Paint attribute
on	On/Off

The default setting enables BackingStore

See Also

testPaintAttribute(), paintCache()

bool QwtPolarCanvas::testPaintAttribute

(

PaintAttribute

attribute

)

const

Test wether a paint attribute is enabled

Parameters

attribute

Paint attribute

Returns

true if the attribute is enabled

See Also

setPaintAttribute()

QPoint QwtPolarCanvas::transform

(

const QwtPointPolar &

polarPos

)

const

Translate a point from plot into widget coordinates

Parameters

polarPos

Point in plot coordinates

Returns

Point in widget coordinates

See Also

transform()