QwtPolarCanvas Class Reference

Canvas of a QwtPolarPlot. More...

#include <qwt_polar_canvas.h>

List of all members.

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

)

[protected, virtual]

Redraw the canvas.

void QwtPolarCanvas::invalidatePaintCache

(

)

Invalidate the internal paint cache.

const QPixmap * QwtPolarCanvas::paintCache

(

)

const

Return the paint cache, might be null.

QPixmap * QwtPolarCanvas::paintCache

(

)

Return the paint cache, might be null.

void QwtPolarCanvas::paintEvent

(

QPaintEvent *

event

)

[protected, virtual]

Paint event.

const QwtPolarPlot * QwtPolarCanvas::plot

(

)

const

Return parent plot widget.

QwtPolarPlot * QwtPolarCanvas::plot

(

)

Return parent plot widget.

void QwtPolarCanvas::resizeEvent

(

QResizeEvent *

event

)

[protected, virtual]

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()