QwtPolarCanvas Class Reference

#include <qwt_polar_canvas.h>

List of all members.

Public Types
enum	PaintAttribute { BackingStore = 0x01 }
typedef QFlags< PaintAttribute >	PaintAttributes
Public Member Functions
	QwtPolarCanvas (QwtPolarPlot *)
virtual	~QwtPolarCanvas ()
QwtPolarPlot *	plot ()
const QwtPolarPlot *	plot () const
void	setPaintAttribute (PaintAttribute, bool on=true)
bool	testPaintAttribute (PaintAttribute) const
const QPixmap *	backingStore () const
void	invalidateBackingStore ()
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 Typedef Documentation

typedef QFlags<PaintAttribute> QwtPolarCanvas::PaintAttributes

Paint attributes.

---

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.

---

Constructor & Destructor Documentation

QwtPolarCanvas::QwtPolarCanvas

(

QwtPolarPlot *

plot

)

[explicit]

Constructor.

QwtPolarCanvas::~QwtPolarCanvas

(

)

[virtual]

Destructor.

---

Member Function Documentation

const QPixmap * QwtPolarCanvas::backingStore

(

)

const

Returns:

Backing store, might be null

void QwtPolarCanvas::invalidateBackingStore

(

)

Invalidate the internal backing store.

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

)

[protected, virtual]

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

)

[protected, virtual]

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()