A class which draws a coordinate grid. More...

#include <qwt_plot_grid.h>

Inheritance diagram for QwtPlotGrid:

Classes
class	PrivateData

Public Member Functions
	QwtPlotGrid ()
	Enables major grid, disables minor grid.

virtual	~QwtPlotGrid ()
	Destructor.

virtual int	rtti () const QWT_OVERRIDE

void	enableX (bool)
	Enable or disable vertical grid lines.

bool	xEnabled () const

void	enableY (bool)
	Enable or disable horizontal grid lines.

bool	yEnabled () const

void	enableXMin (bool)
	Enable or disable minor vertical grid lines.

bool	xMinEnabled () const

void	enableYMin (bool)
	Enable or disable minor horizontal grid lines.

bool	yMinEnabled () const

void	setXDiv (const QwtScaleDiv &)
	Assign an x axis scale division.

const QwtScaleDiv &	xScaleDiv () const

void	setYDiv (const QwtScaleDiv &)
	Assign a y axis division.

const QwtScaleDiv &	yScaleDiv () const

void	setPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
	Build and assign a pen for both major and minor grid lines.

void	setPen (const QPen &)
	Assign a pen for both major and minor grid lines.

void	setMajorPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
	Build and assign a pen for both major grid lines.

void	setMajorPen (const QPen &)
	Assign a pen for the major grid lines.

const QPen &	majorPen () const

void	setMinorPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
	Build and assign a pen for the minor grid lines.

void	setMinorPen (const QPen &)
	Assign a pen for the minor grid lines.

const QPen &	minorPen () const

virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const QWT_OVERRIDE
	Draw the grid.

virtual void	updateScaleDiv (const QwtScaleDiv &xScaleDiv, const QwtScaleDiv &yScaleDiv) QWT_OVERRIDE
	Update the grid to changes of the axes scale division.

Public Member Functions inherited from QwtPlotItem
	QwtPlotItem ()
	Constructor.

	QwtPlotItem (const QString &title)
	Constructor.

	QwtPlotItem (const QwtText &title)
	Constructor.

virtual	~QwtPlotItem ()
	Destroy the QwtPlotItem.

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

void	detach ()
	This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

QwtPlot *	plot () const
	Return attached plot.

void	setTitle (const QString &title)
	Set a new title.

void	setTitle (const QwtText &title)
	Set a new title.

const QwtText &	title () const

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

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute.

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

bool	testItemInterest (ItemInterest) const
	Test an item interest.

void	setRenderHint (RenderHint, bool on=true)
	Toggle an render hint.

bool	testRenderHint (RenderHint) const
	Test a render hint.

void	setRenderThreadCount (uint numThreads)
	On multi core systems rendering of certain plot item ( f.e QwtPlotRasterItem ) can be done in parallel in several threads.

uint	renderThreadCount () const

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

QSize	legendIconSize () const

double	z () const
	Plot items are painted in increasing z-order.

void	setZ (double z)
	Set the z value.

void	show ()
	Show the item.

void	hide ()
	Hide the item.

virtual void	setVisible (bool)
	Show/Hide the item.

bool	isVisible () const

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set X and Y axis.

void	setXAxis (QwtAxisId)
	Set the X axis.

QwtAxisId	xAxis () const
	Return xAxis.

void	setYAxis (QwtAxisId)
	Set the Y axis.

QwtAxisId	yAxis () const
	Return yAxis.

virtual void	itemChanged ()
	Update the legend and call QwtPlot::autoRefresh() for the parent plot.

virtual void	legendChanged ()
	Update the legend of the parent plot.

virtual QRectF	boundingRect () const

virtual void	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
	Calculate a hint for the canvas margin.

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

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding scale rectangle of 2 maps.

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding paint rectangle of 2 maps.

virtual QList< QwtLegendData >	legendData () const
	Return all information, that is needed to represent the item on the legend.

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

Additional Inherited Members
Public Types inherited from 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_PlotUserItem = 1000 }
	Runtime type information. More...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 , Margins = 0x04 }
	Plot Item Attributes. More...

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	Plot Item Interests/绘图项关注的事件类型 More...

enum	RenderHint { RenderAntialiased = 0x1 }
	Render hints. More...

Protected Member Functions inherited from QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Return a default icon from a brush.

Detailed Description

A class which draws a coordinate grid.

The QwtPlotGrid class can be used to draw a coordinate grid. A coordinate grid consists of major and minor vertical and horizontal grid lines. The locations of the grid lines are determined by the X and Y scale divisions which can be assigned with setXDiv() and setYDiv(). The draw() member draws the grid within a bounding rectangle.

Member Function Documentation

◆ draw()

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

virtual

Draw the grid.

The grid is drawn into the bounding rectangle such that grid lines begin and end at the rectangle's borders. The X and Y maps are used to map the scale divisions into the drawing region screen.

Parameters

painter	Painter
xMap	X axis map
yMap	Y axis
canvasRect	Contents rectangle of the plot canvas

Implements QwtPlotItem.

◆ enableX()

void QwtPlotGrid::enableX ( bool on )

Enable or disable vertical grid lines.

Parameters

on	Enable (true) or disable

See also: Minor grid lines can be enabled or disabled with enableXMin()

◆ enableXMin()

void QwtPlotGrid::enableXMin ( bool on )

Enable or disable minor vertical grid lines.

Parameters

on	Enable (true) or disable

See also: enableX()

◆ enableY()

void QwtPlotGrid::enableY ( bool on )

Enable or disable horizontal grid lines.

Parameters

on	Enable (true) or disable

See also: Minor grid lines can be enabled or disabled with enableYMin()

◆ enableYMin()

void QwtPlotGrid::enableYMin ( bool on )

Enable or disable minor horizontal grid lines.

Parameters

on	Enable (true) or disable

See also: enableY()

◆ majorPen()

const QPen & QwtPlotGrid::majorPen ( ) const

Returns: the pen for the major grid lines

See also: setMajorPen(), setMinorPen(), setPen()

◆ minorPen()

const QPen & QwtPlotGrid::minorPen ( ) const

Returns: the pen for the minor grid lines

See also: setMinorPen(), setMajorPen(), setPen()

◆ rtti()

int QwtPlotGrid::rtti ( ) const

virtual

Returns: QwtPlotItem::Rtti_PlotGrid

Reimplemented from QwtPlotItem.

◆ setMajorPen() [1/2]

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

Build and assign a pen for both major grid lines.

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.

Parameters

color	Pen color
width	Pen width
style	Pen style

See also: pen(), brush()

◆ setMajorPen() [2/2]

void QwtPlotGrid::setMajorPen ( const QPen & pen )

Assign a pen for the major grid lines.

Parameters

pen Pen

See also: majorPen(), setMinorPen(), setPen()

◆ setMinorPen() [1/2]

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

Build and assign a pen for the minor grid lines.

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.

Parameters

color	Pen color
width	Pen width
style	Pen style

See also: pen(), brush()

◆ setMinorPen() [2/2]

void QwtPlotGrid::setMinorPen ( const QPen & pen )

Assign a pen for the minor grid lines.

Parameters

pen Pen

See also: minorPen(), setMajorPen(), setPen()

◆ setPen() [1/2]

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

Build and assign a pen for both major and minor grid lines.

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.

Parameters

color	Pen color
width	Pen width
style	Pen style

See also: pen(), brush()

◆ setPen() [2/2]

void QwtPlotGrid::setPen ( const QPen & pen )

Assign a pen for both major and minor grid lines.

Parameters

pen Pen

See also: setMajorPen(), setMinorPen()

◆ setXDiv()

void QwtPlotGrid::setXDiv ( const QwtScaleDiv & scaleDiv )

Assign an x axis scale division.

Parameters

scaleDiv Scale division

◆ setYDiv()

void QwtPlotGrid::setYDiv ( const QwtScaleDiv & scaleDiv )

Assign a y axis division.

Parameters

scaleDiv Scale division

◆ updateScaleDiv()

void QwtPlotGrid::updateScaleDiv	(	const QwtScaleDiv &	xScaleDiv,
		const QwtScaleDiv &	yScaleDiv
	)

virtual

Update the grid to changes of the axes scale division.

Parameters

xScaleDiv	Scale division of the x-axis
yScaleDiv	Scale division of the y-axis

See also: QwtPlot::updateAxes()

Reimplemented from QwtPlotItem.

◆ xEnabled()

bool QwtPlotGrid::xEnabled ( ) const

Returns: true if vertical grid lines are enabled

See also: enableX()

◆ xMinEnabled()

bool QwtPlotGrid::xMinEnabled ( ) const

Returns: true if minor vertical grid lines are enabled

See also: enableXMin()

◆ xScaleDiv()

const QwtScaleDiv & QwtPlotGrid::xScaleDiv ( ) const

Returns: the scale division of the x axis

◆ yEnabled()

bool QwtPlotGrid::yEnabled ( ) const

Returns: true if horizontal grid lines are enabled

See also: enableY()

◆ yMinEnabled()

bool QwtPlotGrid::yMinEnabled ( ) const

Returns: true if minor horizontal grid lines are enabled

See also: enableYMin()

◆ yScaleDiv()

const QwtScaleDiv & QwtPlotGrid::yScaleDiv ( ) const

Returns: the scale division of the y axis

The documentation for this class was generated from the following files:

/home/runner/work/QWT/QWT/src/qwt_plot_grid.h
/home/runner/work/QWT/QWT/src/qwt_plot_grid.cpp

Classes

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ draw()

◆ enableX()

◆ enableXMin()

◆ enableY()

◆ enableYMin()

◆ majorPen()

◆ minorPen()

◆ rtti()

◆ setMajorPen() [1/2]

◆ setMajorPen() [2/2]

◆ setMinorPen() [1/2]

◆ setMinorPen() [2/2]

◆ setPen() [1/2]

◆ setPen() [2/2]

◆ setXDiv()

◆ setYDiv()

◆ updateScaleDiv()

◆ xEnabled()

◆ xMinEnabled()

◆ xScaleDiv()

◆ yEnabled()

◆ yMinEnabled()

◆ yScaleDiv()