An item which draws scales and grid lines on a polar plot 更多...

#include <qwt_polar_grid.h>

类 QwtPolarGrid 继承关系图:

类
class	PrivateData

Public 类型
enum	DisplayFlag { SmartOriginLabel = 1 , HideMaxRadiusLabel = 2 , ClipAxisBackground = 4 , SmartScaleDraw = 8 , ClipGridLines = 16 }
	Display flags to avoid conflicts when painting scales and grid lines 更多...

enum	GridAttribute { AutoScaling = 0x01 }
	Grid attributes 更多...

Public 类型继承自 QwtPolarItem
enum	RttiValues { Rtti_PolarItem = 0 , Rtti_PolarGrid , Rtti_PolarMarker , Rtti_PolarCurve , Rtti_PolarSpectrogram , Rtti_PolarUserItem = 1000 }
	Runtime type information 更多...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 }
	Plot Item Attributes 更多...

enum	RenderHint { RenderAntialiased = 0x01 }
	Render hints 更多...

Public 成员函数
	QwtPolarGrid ()
	Constructor

	~QwtPolarGrid () override
	Destructor

virtual int	rtti () const override
	Get the runtime type information

void	setDisplayFlag (DisplayFlag, bool on=true)
	Set a display flag

bool	testDisplayFlag (DisplayFlag) const
	Test a display flag

void	setGridAttribute (GridAttribute, bool on=true)
	Set a grid attribute

bool	testGridAttribute (GridAttribute) const
	Test a grid attribute

void	showGrid (int scaleId, bool show=true)
	Show/hide the grid for a scale

bool	isGridVisible (int scaleId) const
	Check if the grid is visible for a scale

void	showMinorGrid (int scaleId, bool show=true)
	Show/hide the minor grid for a scale

bool	isMinorGridVisible (int scaleId) const
	Check if the minor grid is visible for a scale

void	showAxis (int axisId, bool show=true)
	Show/hide an axis

bool	isAxisVisible (int axisId) const
	Check if an axis is visible

void	setPen (const QPen &p)
	Set the pen

void	setFont (const QFont &)
	Set the font

void	setMajorGridPen (const QPen &p)
	Set the major grid pen

void	setMajorGridPen (int scaleId, const QPen &p)
	Set the major grid pen for a scale

QPen	majorGridPen (int scaleId) const
	Get the major grid pen for a scale

void	setMinorGridPen (const QPen &p)
	Set the minor grid pen

void	setMinorGridPen (int scaleId, const QPen &p)
	Set the minor grid pen for a scale

QPen	minorGridPen (int scaleId) const
	Get the minor grid pen for a scale

void	setAxisPen (int axisId, const QPen &p)
	Set the axis pen

QPen	axisPen (int axisId) const
	Get the axis pen

void	setAxisFont (int axisId, const QFont &p)
	Set the axis font

QFont	axisFont (int axisId) const
	Get the axis font

void	setScaleDraw (int axisId, QwtScaleDraw *)
	Set the scale draw for an axis

const QwtScaleDraw *	scaleDraw (int axisId) const
	Get the scale draw for an axis (const version)

QwtScaleDraw *	scaleDraw (int axisId)
	Get the scale draw for an axis

void	setAzimuthScaleDraw (QwtRoundScaleDraw *)
	Set the azimuth scale draw

const QwtRoundScaleDraw *	azimuthScaleDraw () const
	Get the azimuth scale draw (const version)

QwtRoundScaleDraw *	azimuthScaleDraw ()
	Get the azimuth scale draw

virtual void	draw (QPainter *p, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, double radius, const QRectF &rect) const override
	Draw the grid

virtual void	updateScaleDiv (const QwtScaleDiv &azimuthMap, const QwtScaleDiv &radialMap, const QwtInterval &) override
	Update the scale division

virtual int	marginHint () const override
	Get the margin hint

Public 成员函数继承自 QwtPolarItem
	QwtPolarItem (const QwtText &title=QwtText())
	Constructor

virtual	~QwtPolarItem ()
	Destructor

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

void	detach ()
	Detach the item from its plot

QwtPolarPlot *	plot () const
	Get the attached plot

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

void	setTitle (const QwtText &title)
	Set the title from 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	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

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
	Get the visibility

virtual void	itemChanged ()
	Update the item and trigger autoRefresh

virtual void	legendChanged ()
	Update the legend

virtual QwtInterval	boundingInterval (int scaleId) const
	Get the bounding interval for a scale

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

QSize	legendIconSize () const
	Get the legend icon size

virtual QList< QwtLegendData >	legendData () const
	Get the legend data

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const
	Get the legend icon

Protected 成员函数
void	drawRays (QPainter *, const QRectF &, const QPointF &pole, double radius, const QwtScaleMap &azimuthMap, const QList< double > &) const
	Draw the rays

void	drawCircles (QPainter *, const QRectF &, const QPointF &pole, const QwtScaleMap &radialMap, const QList< double > &) const
	Draw the circles

void	drawAxis (QPainter *, int axisId) const
	Draw an axis

详细描述

An item which draws scales and grid lines on a polar plot

The QwtPolarGrid class can be used to draw a coordinate grid. A coordinate grid consists of major and minor gridlines. The locations of the gridlines are determined by the azimuth and radial scale divisions.

QwtPolarGrid is also responsible for drawing the axis representing the scales. It is possible to display 4 radial and one azimuth axis.

Whenever the scale divisions of the plot widget changes the grid is synchronized by updateScaleDiv().

参见: QwtPolarPlot, QwtPolar::Axis

成员枚举类型说明

◆ DisplayFlag

enum QwtPolarGrid::DisplayFlag

Display flags to avoid conflicts when painting scales and grid lines

The default setting enables all flags.

参见: setDisplayFlag(), testDisplayFlag()

枚举值
SmartOriginLabel	Try to avoid situations, where the label of the origin is painted over another axis.
HideMaxRadiusLabel	Often the outermost tick of the radial scale is close to the canvas border. With HideMaxRadiusLabel enabled it is not painted.
ClipAxisBackground	The tick labels of the radial scales might be hard to read, when they are painted on top of the radial grid lines ( or on top of a curve/spectrogram ). When ClipAxisBackground the bounding rect of each label is added to the clip region.
SmartScaleDraw	Don't paint the backbone of the radial axes, when they are very close to a line of the azimuth grid.
ClipGridLines	All grid lines are clipped against the plot area before being painted. When the plot is zoomed in this will have an significant impact on the performance of the painting code.

◆ GridAttribute

enum QwtPolarGrid::GridAttribute

Grid attributes

参见: setGridAttributes(), testGridAttributes()

枚举值
AutoScaling	When AutoScaling is enabled, the radial axes will be adjusted to the interval, that is currently visible on the canvas plot.

构造及析构函数说明

◆ QwtPolarGrid()

QwtPolarGrid::QwtPolarGrid ( )

explicit

Constructor

Enables major and disables minor grid lines. The azimuth and right radial axis are visible. All other axes are hidden. AutoScaling is enabled.

Destructor

成员函数说明

◆ axisFont()

QFont QwtPolarGrid::axisFont ( int axisId ) const

Get the axis font

Get the font for the tick labels of a specific axis

参数

axisId Axis id (QwtPolar::Axis)

返回: Font for the axis

参见: setAxisFont()

◆ axisPen()

QPen QwtPolarGrid::axisPen ( int axisId ) const

Get the axis pen

Get the pen for painting a specific axis

参数

axisId Axis id (QwtPolar::Axis)

返回: Pen for the axis

参见: setAxisPen()

◆ azimuthScaleDraw() [1/2]

QwtRoundScaleDraw * QwtPolarGrid::azimuthScaleDraw ( )

Get the azimuth scale draw

Get the scale draw for the azimuth scale

返回: Scale draw for the azimuth scale

参见: setAzimuthScaleDraw(), scaleDraw()

◆ azimuthScaleDraw() [2/2]

const QwtRoundScaleDraw * QwtPolarGrid::azimuthScaleDraw ( ) const

Get the azimuth scale draw (const version)

Get the scale draw for the azimuth scale

返回: Scale draw for the azimuth scale

参见: setAzimuthScaleDraw(), scaleDraw()

◆ draw()

void QwtPolarGrid::draw	(	QPainter *	painter,
		const QwtScaleMap &	azimuthMap,
		const QwtScaleMap &	radialMap,
		const QPointF &	pole,
		double	radius,
		const QRectF &	canvasRect
	)		const

overridevirtual

Draw the grid

Draw the grid and axes

参数

painter	Painter
azimuthMap	Maps azimuth values to values related to 0.0, M_2PI
radialMap	Maps radius values into painter coordinates
pole	Position of the pole in painter coordinates
radius	Radius of the complete plot area in painter coordinates
canvasRect	Contents rect of the canvas in painter coordinates

实现了 QwtPolarItem.

◆ drawAxis()

void QwtPolarGrid::drawAxis	(	QPainter *	painter,
		int	axisId
	)		const

protected

Draw an axis

Paint an axis

参数

painter	Painter
axisId	Axis id (QwtPolar::Axis)

◆ drawCircles()

void QwtPolarGrid::drawCircles	(	QPainter *	painter,
		const QRectF &	canvasRect,
		const QPointF &	pole,
		const QwtScaleMap &	radialMap,
		const QList< double > &	values
	)		const

protected

Draw the circles

Draw circles

参数

painter	Painter
canvasRect	Contents rect of the canvas in painter coordinates
pole	Position of the pole in painter coordinates
radialMap	Maps radius values into painter coordinates.
values	Radial values, indicating the distances from the pole

◆ drawRays()

void QwtPolarGrid::drawRays	(	QPainter *	painter,
		const QRectF &	canvasRect,
		const QPointF &	pole,
		double	radius,
		const QwtScaleMap &	azimuthMap,
		const QList< double > &	values
	)		const

protected

Draw the rays

Draw lines from the pole

参数

painter	Painter
canvasRect	Contents rect of the canvas in painter coordinates
pole	Position of the pole in painter coordinates
radius	Length of the lines in painter coordinates
azimuthMap	Maps azimuth values to values related to 0.0, M_2PI
values	Azimuth values, indicating the direction of the lines

◆ isAxisVisible()

bool QwtPolarGrid::isAxisVisible ( int axisId ) const

Check if an axis is visible

参数

axisId Axis id (QwtPolar::Axis)

返回: True if the axis is visible

参见: showAxis()

◆ isGridVisible()

bool QwtPolarGrid::isGridVisible ( int scaleId ) const

Check if the grid is visible for a scale

Check if grid lines are visible for a scale

参数

scaleId Scale id (QwtPolar::Scale)

返回: True if grid lines are enabled

参见: QwtPolar::Scale, showGrid()

◆ isMinorGridVisible()

bool QwtPolarGrid::isMinorGridVisible ( int scaleId ) const

Check if the minor grid is visible for a scale

Check if minor grid lines are visible for a scale

参数

scaleId Scale id (QwtPolar::Scale)

返回: True if minor grid lines are enabled

参见: showMinorGrid()

◆ majorGridPen()

QPen QwtPolarGrid::majorGridPen ( int scaleId ) const

Get the major grid pen for a scale

Get the pen for painting the major grid lines of a specific scale

参数

scaleId Scale id (QwtPolar::Scale)

返回: Pen for major grid lines

参见: setMajorGridPen(), minorGridPen()

◆ marginHint()

int QwtPolarGrid::marginHint ( ) const

overridevirtual

Get the margin hint

返回: Number of pixels necessary to paint the azimuth scale

参见: QwtRoundScaleDraw::extent()

重载 QwtPolarItem .

◆ minorGridPen()

QPen QwtPolarGrid::minorGridPen ( int scaleId ) const

Get the minor grid pen for a scale

Get the pen for painting the minor grid lines of a specific scale

参数

scaleId Scale id (QwtPolar::Scale)

返回: Pen for minor grid lines

参见: setMinorGridPen()

◆ rtti()

int QwtPolarGrid::rtti ( ) const

overridevirtual

Get the runtime type information

返回: QwtPlotItem::Rtti_PolarGrid

重载 QwtPolarItem .

◆ scaleDraw() [1/2]

QwtScaleDraw * QwtPolarGrid::scaleDraw ( int axisId )

Get the scale draw for an axis

Get the scale draw of a specified axis

参数

axisId Axis index (QwtPolar::AxisLeft <= axisId <= QwtPolar::AxisBottom)

返回: Scale draw for the axis, or nullptr if axis is invalid

参见: setScaleDraw(), azimuthScaleDraw()

◆ scaleDraw() [2/2]

const QwtScaleDraw * QwtPolarGrid::scaleDraw ( int axisId ) const

Get the scale draw for an axis (const version)

Get the scale draw of a specified axis

参数

axisId Axis index (QwtPolar::AxisLeft <= axisId <= QwtPolar::AxisBottom)

返回: Scale draw for the axis, or nullptr if axis is invalid

参见: azimuthScaleDraw()

◆ setAxisFont()

void QwtPolarGrid::setAxisFont	(	int	axisId,
		const QFont &	font
	)

Set the axis font

Assign a font for the tick labels of a specific axis

参数

axisId	Axis id (QwtPolar::Axis)
font	New font

参见: axisFont()

◆ setAxisPen()

void QwtPolarGrid::setAxisPen	(	int	axisId,
		const QPen &	pen
	)

Set the axis pen

Assign a pen for painting an axis

参数

axisId	Axis id (QwtPolar::Axis)
pen	Pen for the axis

参见: axisPen()

◆ setAzimuthScaleDraw()

void QwtPolarGrid::setAzimuthScaleDraw ( QwtRoundScaleDraw * scaleDraw )

Set the azimuth scale draw

Set a scale draw for the azimuth scale

参数

scaleDraw Object responsible for drawing scales (ownership is transferred)

参见: azimuthScaleDraw(), setScaleDraw()

◆ setDisplayFlag()

void QwtPolarGrid::setDisplayFlag	(	DisplayFlag	flag,
		bool	on = `true`
	)

Set a display flag

Change the display flags

参数

flag	Display flag to modify
on	True to enable, false to disable

参见: DisplayFlag

◆ setFont()

void QwtPolarGrid::setFont ( const QFont & font )

Set the font

Assign a font for all scale tick labels

参数

font	Font for all scale tick labels

参见: setAxisFont()

◆ setGridAttribute()

void QwtPolarGrid::setGridAttribute	(	GridAttribute	attribute,
		bool	on = `true`
	)

Set a grid attribute

Specify an attribute for the grid

参数

attribute	Grid attribute to set
on	True to enable, false to disable

参见: GridAttribute, testGridAttribute(), updateScaleDiv(), QwtPolarPlot::zoom(), QwtPolarPlot::scaleDiv()

◆ setMajorGridPen() [1/2]

void QwtPolarGrid::setMajorGridPen ( const QPen & pen )

Set the major grid pen

Assign a pen for the major grid lines

参数

pen	Pen for major grid lines

参见: setPen(), setMinorGridPen(), majorGridPen()

◆ setMajorGridPen() [2/2]

void QwtPolarGrid::setMajorGridPen	(	int	scaleId,
		const QPen &	pen
	)

Set the major grid pen for a scale

Assign a pen for the major grid lines of a specific scale

参数

scaleId	Scale id (QwtPolar::Scale)
pen	Pen for major grid lines

参见: setPen(), setMinorGridPen(), majorGridPen()

◆ setMinorGridPen() [1/2]

void QwtPolarGrid::setMinorGridPen ( const QPen & pen )

Set the minor grid pen

Assign a pen for the minor grid lines

参数

pen	Pen for minor grid lines

参见: setPen(), setMajorGridPen(), minorGridPen()

◆ setMinorGridPen() [2/2]

void QwtPolarGrid::setMinorGridPen	(	int	scaleId,
		const QPen &	pen
	)

Set the minor grid pen for a scale

Assign a pen for the minor grid lines of a specific scale

参数

scaleId	Scale id (QwtPolar::Scale)
pen	Pen for minor grid lines

参见: setPen(), setMajorGridPen(), minorGridPen()

◆ setPen()

void QwtPolarGrid::setPen ( const QPen & pen )

Set the pen

Assign a pen for all axes and grid lines

参数

pen	Pen for all axes and grid lines

参见: setMajorGridPen(), setMinorGridPen(), setAxisPen()

◆ setScaleDraw()

void QwtPolarGrid::setScaleDraw	(	int	axisId,
		QwtScaleDraw *	scaleDraw
	)

Set the scale draw for an axis

Set a scale draw for a specified axis

参数

axisId	Axis index (QwtPolar::AxisLeft <= axisId <= QwtPolar::AxisBottom)
scaleDraw	Object responsible for drawing scales (ownership is transferred)

参见: scaleDraw(), setAzimuthScaleDraw()

◆ showAxis()

void QwtPolarGrid::showAxis	(	int	axisId,
		bool	show = `true`
	)

Show/hide an axis

参数

axisId	Axis id (QwtPolar::Axis)
show	True to show, false to hide

参见: isAxisVisible()

◆ showGrid()

void QwtPolarGrid::showGrid	(	int	scaleId,
		bool	show = `true`
	)

Show/hide the grid for a scale

Show/hide grid lines for a scale

参数

scaleId	Scale id (QwtPolar::Scale)
show	True to show, false to hide

参见: QwtPolar::Scale, isGridVisible()

◆ showMinorGrid()

void QwtPolarGrid::showMinorGrid	(	int	scaleId,
		bool	show = `true`
	)

Show/hide the minor grid for a scale

Show/hide minor grid lines for a scale

参数

scaleId	Scale id (QwtPolar::Scale)
show	True to show, false to hide

To display minor grid lines, showGrid() needs to be enabled too.

参见: showGrid()

◆ testDisplayFlag()

bool QwtPolarGrid::testDisplayFlag ( DisplayFlag flag ) const

Test a display flag

参数

flag	Display flag to test

返回: True if flag is enabled

参见: DisplayFlag

◆ testGridAttribute()

bool QwtPolarGrid::testGridAttribute ( GridAttribute attribute ) const

Test a grid attribute

参数

attribute Grid attribute to test

返回: True if attribute is enabled

参见: GridAttribute, setGridAttribute()

◆ updateScaleDiv()

void QwtPolarGrid::updateScaleDiv	(	const QwtScaleDiv &	azimuthScaleDiv,
		const QwtScaleDiv &	radialScaleDiv,
		const QwtInterval &	interval
	)

overridevirtual

Update the scale division

Update the item to changes of the axes scale division

参数

azimuthScaleDiv	Scale division of the azimuth-scale
radialScaleDiv	Scale division of the radius-axis
interval	The interval of the radius-axis that is visible on the canvas

If AutoScaling is enabled the radial scale is calculated from the interval, otherwise the scales are adopted to the plot scales.

参见: QwtPolarPlot::setGridAttributes()

重载 QwtPolarItem .

该类的文档由以下文件生成:

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

类

Public 类型

Public 成员函数

Protected 成员函数

详细描述

成员枚举类型说明

◆ DisplayFlag

◆ GridAttribute

构造及析构函数说明

◆ QwtPolarGrid()

成员函数说明

◆ axisFont()

◆ axisPen()

◆ azimuthScaleDraw() [1/2]

◆ azimuthScaleDraw() [2/2]

◆ draw()

◆ drawAxis()

◆ drawCircles()

◆ drawRays()

◆ isAxisVisible()

◆ isGridVisible()

◆ isMinorGridVisible()

◆ majorGridPen()

◆ marginHint()

◆ minorGridPen()

◆ rtti()

◆ scaleDraw() [1/2]

◆ scaleDraw() [2/2]

◆ setAxisFont()

◆ setAxisPen()

◆ setAzimuthScaleDraw()

◆ setDisplayFlag()

◆ setFont()

◆ setGridAttribute()

◆ setMajorGridPen() [1/2]

◆ setMajorGridPen() [2/2]

◆ setMinorGridPen() [1/2]

◆ setMinorGridPen() [2/2]

◆ setPen()

◆ setScaleDraw()

◆ showAxis()

◆ showGrid()

◆ showMinorGrid()

◆ testDisplayFlag()

◆ testGridAttribute()

◆ updateScaleDiv()