显示可由 QPainterPath 定义的任何图形形状的绘图项更多...

#include <qwt_plot_shapeitem.h>

类 QwtPlotShapeItem 继承关系图:

类
class	PrivateData

Public 类型
enum	PaintAttribute { ClipPolygons = 0x01 }
	绘制属性更多...

enum	LegendMode { LegendShape , LegendColor }
	图例模式更多...

Public 类型继承自 QwtPlotItem
enum	RttiValues { Rtti_PlotItem = 0 , Rtti_PlotGrid , Rtti_PlotScale , Rtti_PlotLegend , Rtti_PlotMarker , Rtti_PlotCurve , Rtti_PlotSpectroCurve , Rtti_PlotIntervalCurve , Rtti_PlotHistogram , Rtti_PlotSpectrogram , Rtti_PlotGraphic , Rtti_PlotTradingCurve , Rtti_PlotBarChart , Rtti_PlotMultiBarChart , Rtti_PlotShape , Rtti_PlotTextLabel , Rtti_PlotZone , Rtti_PlotVectorField , Rtti_PlotArrowMarker , Rtti_PlotBoxChart , Rtti_PlotUserItem = 1000 }
	运行时类型信息更多...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 , Margins = 0x04 }
	绘图项属性更多...

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	绘图项关注的事件类型更多...

enum	RenderHint { RenderAntialiased = 0x1 }
	渲染提示更多...

Public 成员函数
	QwtPlotShapeItem (const QString &title=QString())
	构造函数

	QwtPlotShapeItem (const QwtText &title)
	构造函数

virtual	~QwtPlotShapeItem ()
	析构函数

void	setPaintAttribute (PaintAttribute, bool on=true)
	指定绘制形状的属性

bool	testPaintAttribute (PaintAttribute) const
	检查绘制属性是否启用

void	setLegendMode (LegendMode)
	设置在图例上显示项目的模式

LegendMode	legendMode () const

void	setRect (const QRectF &)
	Set a path built from a rectangle

void	setPolygon (const QPolygonF &)
	Set a path built from a polygon

void	setShape (const QPainterPath &)
	Set the shape to be displayed

QPainterPath	shape () const

void	setPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
	Build and assign a pen

void	setPen (const QPen &)
	Assign a pen

QPen	pen () const

void	setBrush (const QBrush &)
	Assign a brush.

QBrush	brush () const

void	setRenderTolerance (double)
	Set the tolerance for the weeding optimization

double	renderTolerance () const

virtual QRectF	boundingRect () const override
	Bounding rectangle of the shape

virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const override
	Draw the shape item

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const override

virtual int	rtti () const override
	获取运行时类型信息

Public 成员函数继承自 QwtPlotItem
	QwtPlotItem ()
	Default constructor

	QwtPlotItem (const QString &title)
	Constructor with title as QString

	QwtPlotItem (const QwtText &title)
	Constructor with title as QwtText

virtual	~QwtPlotItem ()
	Destructor

void	attach (QwtPlot *plot)
	Attach the item to a plot

void	detach ()
	Detach the item from the plot

QwtPlot *	plot () const
	Get the plot the item is attached to

void	setTitle (const QString &title)
	Set the title using a QString

void	setTitle (const QwtText &title)
	Set the title using a QwtText

const QwtText &	title () const
	Get the title

void	setItemAttribute (ItemAttribute, bool on=true)
	Set an item attribute

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute

void	setItemInterest (ItemInterest, bool on=true)
	Set an item interest

bool	testItemInterest (ItemInterest) const
	Test an item interest

void	setRenderHint (RenderHint, bool on=true)
	Set a render hint

bool	testRenderHint (RenderHint) const
	Test a render hint

void	setRenderThreadCount (uint numThreads)
	Set the number of render threads

uint	renderThreadCount () const
	Get the number of render threads

void	setLegendIconSize (const QSize &)
	Set the legend icon size

QSize	legendIconSize () const
	Get the legend icon size

double	z () const
	Get the z-value

void	setZ (double z)
	Set the z-value

void	show ()
	Show the item

void	hide ()
	Hide the item

virtual void	setVisible (bool)
	Set the visibility

bool	isVisible () const
	Check if the item is visible

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set both axes

void	setXAxis (QwtAxisId)
	Set the x-axis

QwtAxisId	xAxis () const
	Get the x-axis

void	setYAxis (QwtAxisId)
	Set the y-axis

QwtAxisId	yAxis () const
	Get the y-axis

virtual void	itemChanged ()
	Notify the plot that the item has changed

virtual void	legendChanged ()
	Notify the item that the legend has changed

virtual void	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
	Get margin hints for the canvas

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
	Update the item with new scale divisions

virtual void	updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
	Update the item with changes of the legend

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the scale rectangle

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the paint rectangle

virtual QList< QwtLegendData >	legendData () const
	Return legend data

额外继承的成员函数
Protected 成员函数继承自 QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Create a default icon

详细描述

显示可由 QPainterPath 定义的任何图形形状的绘图项

成员枚举类型说明

◆ LegendMode

enum QwtPlotShapeItem::LegendMode

图例模式

枚举值
LegendShape	Display a scaled down version of the shape
LegendColor	Display a filled rectangle

◆ PaintAttribute

enum QwtPlotShapeItem::PaintAttribute

绘制属性

枚举值

ClipPolygons

在绘制多边形之前对其进行裁剪。在点远离可见区域的情况下（例如深度缩放时），这可能会显著提高绘制性能

但多边形裁剪会将绘制路径转换为多边形，这可能会对由曲线或椭圆组成的路径的性能产生负面影响。

构造及析构函数说明

◆ QwtPlotShapeItem() [1/2]

QwtPlotShapeItem::QwtPlotShapeItem ( const QString & title = QString() )

explicit

构造函数

◆ QwtPlotShapeItem() [2/2]

QwtPlotShapeItem::QwtPlotShapeItem ( const QwtText & title )

explicit

构造函数

◆ ~QwtPlotShapeItem()

QwtPlotShapeItem::~QwtPlotShapeItem ( )

virtual

析构函数

成员函数说明

◆ boundingRect()

QRectF QwtPlotShapeItem::boundingRect ( ) const

overridevirtual

Bounding rectangle of the shape

重载 QwtPlotItem .

◆ brush()

QBrush QwtPlotShapeItem::brush ( ) const

返回: Brush used to fill the shape

参见: setBrush(), pen()

◆ draw()

void QwtPlotShapeItem::draw	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect
	)		const

overridevirtual

Draw the shape item

参数

painter	Painter
xMap	X-Scale Map
yMap	Y-Scale Map
canvasRect	Contents rect of the plot canvas

实现了 QwtPlotItem.

◆ legendIcon()

QwtGraphic QwtPlotShapeItem::legendIcon	(	int	index,
		const QSizeF &	size
	)		const

overridevirtual

返回: A rectangle filled with the color of the brush ( or the pen )

参数

index	Index of the legend entry ( usually there is only one )
size	Icon size

参见: setLegendIconSize(), legendData()

重载 QwtPlotItem .

◆ legendMode()

QwtPlotShapeItem::LegendMode QwtPlotShapeItem::legendMode ( ) const

返回: Mode how to represent the item on the legend

参见: legendMode()

◆ pen()

QPen QwtPlotShapeItem::pen ( ) const

返回: Pen used to draw the outline of the shape

参见: setPen(), brush()

◆ renderTolerance()

double QwtPlotShapeItem::renderTolerance ( ) const

返回: Tolerance for the weeding optimization

参见: setRenderTolerance()

◆ rtti()

int QwtPlotShapeItem::rtti ( ) const

overridevirtual

获取运行时类型信息

重载 QwtPlotItem .

◆ setBrush()

void QwtPlotShapeItem::setBrush ( const QBrush & brush )

Assign a brush.

The brush is used to fill the path

参数

brush Brush

参见: brush(), pen()

◆ setLegendMode()

void QwtPlotShapeItem::setLegendMode ( LegendMode mode )

设置在图例上显示项目的模式

◆ setPaintAttribute()

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

指定绘制形状的属性

◆ setPen() [1/2]

void QwtPlotShapeItem::setPen	(	const QColor &	color,
		qreal	width = `0.0`,
		Qt::PenStyle	style = `Qt::SolidLine`
	)

Build and assign a pen

In Qt5 the default pen width is 1.0 ( 0.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() ). This method has been introduced to hide this incompatibility.

参数

color	Pen color
width	Pen width
style	Pen style

参见: pen(), brush()

◆ setPen() [2/2]

void QwtPlotShapeItem::setPen ( const QPen & pen )

Assign a pen

The pen is used to draw the outline of the shape

参数

pen Pen

参见: pen(), brush()

◆ setPolygon()

void QwtPlotShapeItem::setPolygon ( const QPolygonF & polygon )

Set a path built from a polygon

参数

polygon Polygon

参见: setShape(), setRect(), shape()

◆ setRect()

void QwtPlotShapeItem::setRect ( const QRectF & rect )

Set a path built from a rectangle

参数

rect Rectangle

参见: setShape(), setPolygon(), shape()

◆ setRenderTolerance()

void QwtPlotShapeItem::setRenderTolerance ( double tolerance )

Set the tolerance for the weeding optimization

After translating the shape into target device coordinate ( usually widget geometries ) the painter path can be simplified by a point weeding algorithm ( Douglas-Peucker ).

For shapes built from curves and ellipses weeding might have the opposite effect because they have to be expanded to polygons.

参数

tolerance Accepted error when reducing the number of points A value <= 0.0 disables weeding.

参见: renderTolerance(), QwtWeedingCurveFitter

◆ setShape()

void QwtPlotShapeItem::setShape ( const QPainterPath & shape )

Set the shape to be displayed

参数

shape Shape

参见: setShape(), shape()

◆ shape()

QPainterPath QwtPlotShapeItem::shape ( ) const

返回: Shape to be displayed

参见: setShape()

◆ testPaintAttribute()

bool QwtPlotShapeItem::testPaintAttribute ( PaintAttribute attribute ) const

检查绘制属性是否启用

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_plot_shapeitem.h
/home/runner/work/QWT/QWT/src/plot/qwt_plot_shapeitem.cpp

类

Public 类型

Public 成员函数

额外继承的成员函数

详细描述

成员枚举类型说明

◆ LegendMode

◆ PaintAttribute

构造及析构函数说明

◆ QwtPlotShapeItem() [1/2]

◆ QwtPlotShapeItem() [2/2]

◆ ~QwtPlotShapeItem()

成员函数说明

◆ boundingRect()

◆ brush()

◆ draw()

◆ legendIcon()

◆ legendMode()

◆ pen()

◆ renderTolerance()

◆ rtti()

◆ setBrush()

◆ setLegendMode()

◆ setPaintAttribute()

◆ setPen() [1/2]

◆ setPen() [2/2]

◆ setPolygon()

◆ setRect()

◆ setRenderTolerance()

◆ setShape()

◆ shape()

◆ testPaintAttribute()