Layout engine for QwtPlot. More...

#include <qwt_plot_layout.h>

Public Types
enum	Option { AlignScales = 0x01 , IgnoreScrollbars = 0x02 , IgnoreFrames = 0x04 , IgnoreLegend = 0x08 , IgnoreTitle = 0x10 , IgnoreFooter = 0x20 }

typedef QFlags< Option >	Options

Public Member Functions
	QwtPlotLayout ()
	Constructor.

virtual	~QwtPlotLayout ()
	Destructor.

void	setCanvasMargin (int margin, int axis=-1)

int	canvasMargin (int axisId) const

void	setAlignCanvasToScales (bool)
	Set the align-canvas-to-axis-scales flag for all axes. More...

void	setAlignCanvasToScale (int axisId, bool)

bool	alignCanvasToScale (int axisId) const

void	setSpacing (int)

int	spacing () const

void	setLegendPosition (QwtPlot::LegendPosition pos, double ratio)
	Specify the position of the legend. More...

void	setLegendPosition (QwtPlot::LegendPosition pos)
	Specify the position of the legend. More...

QwtPlot::LegendPosition	legendPosition () const

void	setLegendRatio (double ratio)

double	legendRatio () const

virtual QSize	minimumSizeHint (const QwtPlot *) const

virtual void	activate (const QwtPlot *, const QRectF &plotRect, Options options=Options())
	Recalculate the geometry of all components. More...

virtual void	invalidate ()

QRectF	titleRect () const

QRectF	footerRect () const

QRectF	legendRect () const

QRectF	scaleRect (QwtAxisId) const

QRectF	canvasRect () const

Protected Member Functions
void	setTitleRect (const QRectF &)
	Set the geometry for the title. More...

void	setFooterRect (const QRectF &)
	Set the geometry for the footer. More...

void	setLegendRect (const QRectF &)
	Set the geometry for the legend. More...

void	setScaleRect (QwtAxisId, const QRectF &)
	Set the geometry for an axis. More...

void	setCanvasRect (const QRectF &)
	Set the geometry for the canvas. More...

Detailed Description

Layout engine for QwtPlot.

It is used by the QwtPlot widget to organize its internal widgets or by QwtPlot::print() to render its content to a QPaintDevice like a QPrinter, QPixmap/QImage or QSvgRenderer.

See also: QwtPlot::setPlotLayout()

Definition at line 27 of file qwt_plot_layout.h.

Member Typedef Documentation

◆ Options

typedef QFlags<Option > QwtPlotLayout::Options

An ORed combination of Option values.

Definition at line 58 of file qwt_plot_layout.h.

Member Enumeration Documentation

◆ Option

enum QwtPlotLayout::Option

Options to configure the plot layout engine

See also: activate(), QwtPlotRenderer

Enumerator
AlignScales	Unused.
IgnoreScrollbars	Ignore the dimension of the scrollbars. There are no scrollbars, when the plot is not rendered to widgets.
IgnoreFrames	Ignore all frames.
IgnoreLegend	Ignore the legend.
IgnoreTitle	Ignore the title.
IgnoreFooter	Ignore the footer.

Definition at line 34 of file qwt_plot_layout.h.

Member Function Documentation

◆ activate()

void QwtPlotLayout::activate	(	const QwtPlot *	plot,
		const QRectF &	plotRect,
		Options	options = `Options()`
	)

virtual

Recalculate the geometry of all components.

Parameters

plot	Plot to be layout
plotRect	Rectangle where to place the components
options	Layout options

See also: invalidate(), titleRect(), footerRect() legendRect(), scaleRect(), canvasRect()

Definition at line 1508 of file qwt_plot_layout.cpp.

◆ alignCanvasToScale()

bool QwtPlotLayout::alignCanvasToScale ( int axisPos ) const

Return the align-canvas-to-axis-scales setting. The canvas may:

extend beyond the axis scale ends to maximize its size
align with the axis scale ends to control its size.

Parameters

axisPos Axis position

Returns: align-canvas-to-axis-scales setting

See also: setAlignCanvasToScale(), setAlignCanvasToScale(), setCanvasMargin()

Definition at line 1141 of file qwt_plot_layout.cpp.

◆ canvasMargin()

int QwtPlotLayout::canvasMargin ( int axisPos ) const

Parameters

axisPos Axis position

Returns: Margin around the scale tick borders

See also: setCanvasMargin()

Definition at line 1089 of file qwt_plot_layout.cpp.

◆ canvasRect()

QRectF QwtPlotLayout::canvasRect ( ) const

Returns: Geometry for the canvas

See also: activate(), invalidate()

Definition at line 1380 of file qwt_plot_layout.cpp.

◆ footerRect()

QRectF QwtPlotLayout::footerRect ( ) const

Returns: Geometry for the footer

See also: activate(), invalidate()

Definition at line 1304 of file qwt_plot_layout.cpp.

◆ invalidate()

void QwtPlotLayout::invalidate ( )

virtual

Invalidate the geometry of all components.

See also: activate()

Definition at line 1389 of file qwt_plot_layout.cpp.

◆ legendPosition()

QwtPlot::LegendPosition QwtPlotLayout::legendPosition ( ) const

Returns: Position of the legend

See also: setLegendPosition(), QwtPlot::setLegendPosition(), QwtPlot::legendPosition()

Definition at line 1237 of file qwt_plot_layout.cpp.

◆ legendRatio()

double QwtPlotLayout::legendRatio ( ) const

Returns: The relative size of the legend in the plot.

See also: setLegendPosition()

Definition at line 1260 of file qwt_plot_layout.cpp.

◆ legendRect()

QRectF QwtPlotLayout::legendRect ( ) const

Returns: Geometry for the legend

See also: activate(), invalidate()

Definition at line 1328 of file qwt_plot_layout.cpp.

◆ minimumSizeHint()

QSize QwtPlotLayout::minimumSizeHint ( const QwtPlot * plot ) const

virtual

Returns: Minimum size hint

Parameters

plot	Plot widget

See also: QwtPlot::minimumSizeHint()

Definition at line 1404 of file qwt_plot_layout.cpp.

◆ scaleRect()

QRectF QwtPlotLayout::scaleRect ( QwtAxisId axisId ) const

Parameters

axisId Axis

Returns: Geometry for the scale

See also: activate(), invalidate()

Definition at line 1355 of file qwt_plot_layout.cpp.

◆ setAlignCanvasToScale()

void QwtPlotLayout::setAlignCanvasToScale	(	int	axisPos,
		bool	on
	)

Change the align-canvas-to-axis-scales setting. The canvas may:

extend beyond the axis scale ends to maximize its size,
align with the axis scale ends to control its size.

The axisId parameter is somehow confusing as it identifies a border of the plot and not the axes, that are aligned. F.e when QwtAxis::YLeft is set, the left end of the the x-axes ( QwtAxis::XTop, QwtAxis::XBottom ) is aligned.

Parameters

axisId	Axis index
on	New align-canvas-to-axis-scales setting

See also: setCanvasMargin(), alignCanvasToScale(), setAlignCanvasToScales()

Warning: In case of on == true canvasMargin() will have no effect

Definition at line 1126 of file qwt_plot_layout.cpp.

◆ setAlignCanvasToScales()

void QwtPlotLayout::setAlignCanvasToScales ( bool on )

Set the align-canvas-to-axis-scales flag for all axes.

Parameters

on	True/False

See also: setAlignCanvasToScale(), alignCanvasToScale()

Definition at line 1103 of file qwt_plot_layout.cpp.

◆ setCanvasMargin()

void QwtPlotLayout::setCanvasMargin	(	int	margin,
		int	axisPos = `-1`
	)

Change a margin of the canvas. The margin is the space above/below the scale ticks. A negative margin will be set to -1, excluding the borders of the scales.

Parameters

margin	New margin
axisPos	One of QwtAxis::Position. Specifies where the position of the margin. -1 means margin at all borders.

See also: canvasMargin()

Warning: The margin will have no effect when alignCanvasToScale() is true

Definition at line 1066 of file qwt_plot_layout.cpp.

◆ setCanvasRect()

void QwtPlotLayout::setCanvasRect ( const QRectF & rect )

protected

Set the geometry for the canvas.

This method is intended to be used from derived layouts overloading activate()

See also: canvasRect(), activate()

Definition at line 1371 of file qwt_plot_layout.cpp.

◆ setFooterRect()

void QwtPlotLayout::setFooterRect ( const QRectF & rect )

protected

Set the geometry for the footer.

This method is intended to be used from derived layouts overloading activate()

See also: footerRect(), activate()

Definition at line 1295 of file qwt_plot_layout.cpp.

◆ setLegendPosition() [1/2]

void QwtPlotLayout::setLegendPosition ( QwtPlot::LegendPosition pos )

Specify the position of the legend.

Parameters

pos	The legend's position. Valid values are `QwtPlot::LeftLegend`, `QwtPlot::RightLegend`, `QwtPlot::TopLegend`, `QwtPlot::BottomLegend`.

See also: QwtPlot::setLegendPosition()

Definition at line 1227 of file qwt_plot_layout.cpp.

◆ setLegendPosition() [2/2]

void QwtPlotLayout::setLegendPosition	(	QwtPlot::LegendPosition	pos,
		double	ratio
	)

Specify the position of the legend.

Parameters

pos	The legend's position.
ratio	Ratio between legend and the bounding rectangle of title, footer, canvas and axes. The legend will be shrunk if it would need more space than the given ratio. The ratio is limited to ]0.0 .. 1.0]. In case of <= 0.0 it will be reset to the default ratio. The default vertical/horizontal ratio is 0.33/0.5.

See also: QwtPlot::setLegendPosition()

Definition at line 1183 of file qwt_plot_layout.cpp.

◆ setLegendRatio()

void QwtPlotLayout::setLegendRatio ( double ratio )

Specify the relative size of the legend in the plot

Parameters

ratio Ratio between legend and the bounding rectangle of title, footer, canvas and axes. The legend will be shrunk if it would need more space than the given ratio. The ratio is limited to ]0.0 .. 1.0]. In case of <= 0.0 it will be reset to the default ratio. The default vertical/horizontal ratio is 0.33/0.5.

Definition at line 1251 of file qwt_plot_layout.cpp.

◆ setLegendRect()

void QwtPlotLayout::setLegendRect ( const QRectF & rect )

protected

Set the geometry for the legend.

This method is intended to be used from derived layouts overloading activate()

Parameters

rect	Rectangle for the legend

See also: legendRect(), activate()

Definition at line 1319 of file qwt_plot_layout.cpp.

◆ setScaleRect()

void QwtPlotLayout::setScaleRect	(	QwtAxisId	axisId,
		const QRectF &	rect
	)

protected

Set the geometry for an axis.

This method is intended to be used from derived layouts overloading activate()

Parameters

axisId	Axis
rect	Rectangle for the scale

See also: scaleRect(), activate()

Definition at line 1344 of file qwt_plot_layout.cpp.

◆ setSpacing()

void QwtPlotLayout::setSpacing ( int spacing )

Change the spacing of the plot. The spacing is the distance between the plot components.

Parameters

spacing New spacing

See also: setCanvasMargin(), spacing()

Definition at line 1156 of file qwt_plot_layout.cpp.

◆ setTitleRect()

void QwtPlotLayout::setTitleRect ( const QRectF & rect )

protected

Set the geometry for the title.

This method is intended to be used from derived layouts overloading activate()

See also: titleRect(), activate()

Definition at line 1273 of file qwt_plot_layout.cpp.

◆ spacing()

int QwtPlotLayout::spacing ( ) const

Returns: Spacing

See also: margin(), setSpacing()

Definition at line 1165 of file qwt_plot_layout.cpp.

◆ titleRect()

QRectF QwtPlotLayout::titleRect ( ) const

Returns: Geometry for the title

See also: activate(), invalidate()

Definition at line 1282 of file qwt_plot_layout.cpp.

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Typedef Documentation

◆ Options

Member Enumeration Documentation

◆ Option

Member Function Documentation

◆ activate()

◆ alignCanvasToScale()

◆ canvasMargin()

◆ canvasRect()

◆ footerRect()

◆ invalidate()

◆ legendPosition()

◆ legendRatio()

◆ legendRect()

◆ minimumSizeHint()

◆ scaleRect()

◆ setAlignCanvasToScale()

◆ setAlignCanvasToScales()

◆ setCanvasMargin()

◆ setCanvasRect()

◆ setFooterRect()

◆ setLegendPosition() [1/2]

◆ setLegendPosition() [2/2]

◆ setLegendRatio()

◆ setLegendRect()

◆ setScaleRect()

◆ setSpacing()

◆ setTitleRect()

◆ spacing()

◆ titleRect()