QwtPolarCanvas Class Reference

#include <qwt_polar_canvas.h>

Public Types
enum	PaintAttribute { PaintCached = 1 }

Public Member Functions
	QwtPolarCanvas (QwtPolarPlot *)
virtual	~QwtPolarCanvas ()
QwtPolarPlot *	plot ()
const QwtPolarPlot *	plot () const
void	setPaintAttribute (PaintAttribute, bool on=true)
bool	testPaintAttribute (PaintAttribute) const
QPixmap *	paintCache ()
const QPixmap *	paintCache () const
void	invalidatePaintCache ()

Protected Member Functions
virtual void	paintEvent (QPaintEvent *)
virtual void	resizeEvent (QResizeEvent *)
virtual void	drawContents (QPainter *)
void	drawCanvas (QPainter *, const QwtDoubleRect &)

Protected Attributes
PrivateData *	d_data

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.

• PaintCached
  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.

The default setting enables PaintCached

See Also

setPaintAttribute(), testPaintAttribute(), paintCache()

Constructor & Destructor Documentation

QwtPolarCanvas::QwtPolarCanvas ( QwtPolarPlot *  plot )

explicit

Constructor.

QwtPolarCanvas::~QwtPolarCanvas ( )

virtual

Destructor.

Member Function Documentation

void QwtPolarCanvas::drawCanvas ( QPainter *  painter, const QwtDoubleRect &  canvasRect  )

protected

Draw the the canvas

Paints all plot items to the canvasRect, using QwtPolarPlot::drawCanvas and updates the paint cache.

See Also

QwtPolarPlot::drawCanvas, setPaintAttributes(), testPaintAttributes()

void QwtPolarCanvas::drawContents ( QPainter *  painter )

protectedvirtual

Redraw the canvas.

void QwtPolarCanvas::invalidatePaintCache

(

)

Invalidate the internal paint cache.

QPixmap * QwtPolarCanvas::paintCache

(

)

Return the paint cache, might be null.

const QPixmap * QwtPolarCanvas::paintCache

(

)

const

Return the paint cache, might be null.

void QwtPolarCanvas::paintEvent ( QPaintEvent *  event )

protectedvirtual

Paint event.

QwtPolarPlot * QwtPolarCanvas::plot

(

)

Return parent plot widget.

const QwtPolarPlot * QwtPolarCanvas::plot

(

)

const

Return parent plot widget.

void QwtPolarCanvas::resizeEvent ( QResizeEvent *  event )

protectedvirtual

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 PaintCached

See Also

testPaintAttribute(), drawCanvas(), drawContents(), 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()