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

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.
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 *) override
virtual void	resizeEvent (QResizeEvent *) override

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

Definition at line 27 of file qwt_polar_canvas.h.

Member Typedef Documentation

PaintAttributes

typedef QFlags<PaintAttribute > QwtPolarCanvas::PaintAttributes

An ORed combination of PaintAttribute values.

Definition at line 50 of file qwt_polar_canvas.h.

Member Enumeration Documentation

PaintAttribute

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.

Definition at line 40 of file qwt_polar_canvas.h.

Constructor & Destructor Documentation

QwtPolarCanvas()

QwtPolarCanvas::QwtPolarCanvas ( QwtPolarPlot * plot )

explicit

Constructor.

Definition at line 77 of file qwt_polar_canvas.cpp.

~QwtPolarCanvas()

QwtPolarCanvas::~QwtPolarCanvas ( )

virtual

Destructor.

Definition at line 91 of file qwt_polar_canvas.cpp.

Member Function Documentation

backingStore()

const QPixmap * QwtPolarCanvas::backingStore

(

)

const

Returns

Backing store, might be null

Definition at line 170 of file qwt_polar_canvas.cpp.

invalidateBackingStore()

void QwtPolarCanvas::invalidateBackingStore

(

)

Invalidate the internal backing store.

Definition at line 176 of file qwt_polar_canvas.cpp.

invTransform()

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()

Definition at line 267 of file qwt_polar_canvas.cpp.

paintEvent()

void QwtPolarCanvas::paintEvent ( QPaintEvent * event )

overrideprotectedvirtual

Paint event

Parameters

event

Paint event

Definition at line 186 of file qwt_polar_canvas.cpp.

plot() [1/2]

QwtPolarPlot * QwtPolarCanvas::plot

(

)

Returns

Parent plot widget

Definition at line 97 of file qwt_polar_canvas.cpp.

plot() [2/2]

const QwtPolarPlot * QwtPolarCanvas::plot

(

)

const

Returns

Parent plot widget

Definition at line 103 of file qwt_polar_canvas.cpp.

resizeEvent()

void QwtPolarCanvas::resizeEvent ( QResizeEvent * event )

overrideprotectedvirtual

Resize event

Parameters

event

Resize event

Definition at line 251 of file qwt_polar_canvas.cpp.

setPaintAttribute()

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()

Definition at line 118 of file qwt_polar_canvas.cpp.

testPaintAttribute()

bool QwtPolarCanvas::testPaintAttribute

(

PaintAttribute

attribute

)

const

Test whether a paint attribute is enabled

Parameters

attribute

Paint attribute

Returns

true if the attribute is enabled

See also

setPaintAttribute()

Definition at line 164 of file qwt_polar_canvas.cpp.

transform()

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()

Definition at line 310 of file qwt_polar_canvas.cpp.