QwtPolarCanvas类 参考

Canvas of a QwtPolarPlot 更多...

#include <qwt_polar_canvas.h>

类 QwtPolarCanvas 继承关系图:

类
class	PrivateData

Public 类型
enum	PaintAttribute { BackingStore = 0x01 }
	Paint attributes 更多...

Public 成员函数
	QwtPolarCanvas (QwtPolarPlot *)
	Constructor
	~QwtPolarCanvas () override
	Destructor
QwtPolarPlot *	plot ()
	Get the plot
const QwtPolarPlot *	plot () const
	Get the plot (const version)
void	setPaintAttribute (PaintAttribute, bool on=true)
	Set a paint attribute
bool	testPaintAttribute (PaintAttribute) const
	Test a paint attribute
const QPixmap *	backingStore () const
	Get the backing store
void	invalidateBackingStore ()
	Invalidate the backing store
QwtPointPolar	invTransform (const QPoint &) const
	Inverse transform from widget coordinates to polar coordinates
QPoint	transform (const QwtPointPolar &) const
	Transform from polar coordinates to widget coordinates

Protected 成员函数
virtual void	paintEvent (QPaintEvent *) override
	Handle paint events
virtual void	resizeEvent (QResizeEvent *) override
	Handle resize events

详细描述

Canvas of a QwtPolarPlot

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

注解

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

参见

QwtPolarPlot

成员枚举类型说明

PaintAttribute

enum QwtPolarCanvas::PaintAttribute

Paint attributes

The default setting enables BackingStore

参见

setPaintAttribute(), testPaintAttribute(), backingStore()

枚举值
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.

构造及析构函数说明

QwtPolarCanvas()

QwtPolarCanvas::QwtPolarCanvas ( QwtPolarPlot *  plot )

explicit

Constructor

参数

plot	Parent polar plot widget

Destructor

成员函数说明

backingStore()

const QPixmap * QwtPolarCanvas::backingStore

(

)

const

Get the backing store

Get the backing store pixmap

返回

Backing store pixmap, might be null if not enabled

参见

setPaintAttribute(), invalidateBackingStore()

invalidateBackingStore()

void QwtPolarCanvas::invalidateBackingStore

(

)

Invalidate the backing store

Invalidate the internal backing store

Clears the backing store pixmap, forcing a full repaint on the next paint event.

参见

backingStore()

invTransform()

QwtPointPolar QwtPolarCanvas::invTransform

(

const QPoint &

pos

)

const

Inverse transform from widget coordinates to polar coordinates

Translate a point from widget coordinates to polar coordinates

参数

pos	Point in widget coordinates of the plot canvas

返回

Point in polar coordinates

参见

transform()

paintEvent()

void QwtPolarCanvas::paintEvent ( QPaintEvent *  event )

overrideprotectedvirtual

Handle paint events

Paint event

参数

event

Paint event

plot() [1/2]

QwtPolarPlot * QwtPolarCanvas::plot

(

)

Get the plot

Get the parent plot widget

返回

Parent polar plot widget

plot() [2/2]

const QwtPolarPlot * QwtPolarCanvas::plot

(

)

const

Get the plot (const version)

Get the parent plot widget (const version)

返回

Parent polar plot widget

resizeEvent()

void QwtPolarCanvas::resizeEvent ( QResizeEvent *  event )

overrideprotectedvirtual

Handle resize events

Resize event

参数

event

Resize event

setPaintAttribute()

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

Set a paint attribute

Change the paint attributes

参数

attribute	Paint attribute to modify
on	True to enable, false to disable

The default setting enables BackingStore.

参见

testPaintAttribute(), backingStore()

testPaintAttribute()

bool QwtPolarCanvas::testPaintAttribute

(

PaintAttribute

attribute

)

const

Test a paint attribute

Test whether a paint attribute is enabled

参数

attribute

Paint attribute to test

返回

True if the attribute is enabled

参见

setPaintAttribute()

transform()

QPoint QwtPolarCanvas::transform

(

const QwtPointPolar &

polarPos

)

const

Transform from polar coordinates to widget coordinates

Translate a point from polar coordinates to widget coordinates

参数

polarPos

Point in polar coordinates

返回

Point in widget coordinates

参见

invTransform()

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/plot/qwt_polar_canvas.h
• /home/runner/work/QWT/QWT/src/plot/qwt_polar_canvas.cpp