Plot canvas is a class for displaying interactive 2d charts and plots. More...

#include <qgsplotcanvas.h>

Inheritance diagram for QgsPlotCanvas:

[legend]

Public Slots
virtual void	refresh ()
	Updates and redraws the plot.

Signals
void	contextMenuAboutToShow (QMenu menu, QgsPlotMouseEvent event)
	Emitted before the canvas context menu will be shown.
void	plotAreaChanged ()
	Emitted whenever the visible area of the plot is changed.
void	toolChanged (QgsPlotTool *newTool)
	Emitted when the plot tool is changed.
void	willBeDeleted ()
	Emitted in the destructor when the canvas is about to be deleted, but is still in a perfectly valid state.

Public Member Functions
	QgsPlotCanvas (QWidget *parent=nullptr)
	Constructor for QgsPlotCanvas, with the specified parent widget.
	~QgsPlotCanvas () override
virtual void	cancelJobs ()
	Cancel any rendering job, in a blocking way.
virtual void	centerPlotOn (double x, double y)
	Centers the plot on the plot point corresponding to x, y in canvas units.
virtual QgsCoordinateReferenceSystem	crs () const
	Returns the coordinate reference system (CRS) for map coordinates used by the canvas.
virtual void	panContentsBy (double dx, double dy)
	Pans the plot contents by dx, dy in canvas units.
virtual void	scalePlot (double factor)
	Scales the plot by a specified scale factor.
void	setTool (QgsPlotTool *tool)
	Sets the interactive tool currently being used on the canvas.
virtual QgsPointXY	snapToPlot (QPoint point)
	Snap a canvas point to the plot.
virtual QgsPointXY	toCanvasCoordinates (const QgsPoint &point) const
	Converts a point in map coordinates to the associated canvas point.
virtual QgsPoint	toMapCoordinates (const QgsPointXY &point) const
	Converts a point on the canvas to the associated map coordinate.
QgsPlotTool *	tool ()
	Returns the currently active tool.
void	unsetTool (QgsPlotTool *tool)
	Unset the current tool.
virtual void	zoomToRect (const QRectF &rect)
	Zooms the plot to the specified rect in canvas units.

Protected Member Functions
bool	event (QEvent *e) override
void	keyPressEvent (QKeyEvent *e) override
void	keyReleaseEvent (QKeyEvent *e) override
void	mouseDoubleClickEvent (QMouseEvent *e) override
void	mouseMoveEvent (QMouseEvent *e) override
void	mousePressEvent (QMouseEvent *e) override
void	mouseReleaseEvent (QMouseEvent *e) override
void	resizeEvent (QResizeEvent *e) override
bool	viewportEvent (QEvent *event) override
void	wheelEvent (QWheelEvent *e) override
virtual void	wheelZoom (QWheelEvent *event)
	Zoom plot from a mouse wheel event.

Detailed Description

Plot canvas is a class for displaying interactive 2d charts and plots.

Since: QGIS 3.26

Definition at line 54 of file qgsplotcanvas.h.

Constructor & Destructor Documentation

◆ QgsPlotCanvas()

QgsPlotCanvas::QgsPlotCanvas ( QWidget * parent = nullptr )

Constructor for QgsPlotCanvas, with the specified parent widget.

Definition at line 33 of file qgsplotcanvas.cpp.

◆ ~QgsPlotCanvas()

QgsPlotCanvas::~QgsPlotCanvas ( )

override

Definition at line 54 of file qgsplotcanvas.cpp.

Member Function Documentation

◆ cancelJobs()

void QgsPlotCanvas::cancelJobs ( )

virtual

Cancel any rendering job, in a blocking way.

Used for application closing.

Note: not available in Python bindings

Reimplemented in QgsElevationProfileCanvas.

Definition at line 82 of file qgsplotcanvas.cpp.

◆ centerPlotOn()

void QgsPlotCanvas::centerPlotOn	(	double	x,
		double	y )

virtual

Centers the plot on the plot point corresponding to x, y in canvas units.

The default implementation does nothing.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 282 of file qgsplotcanvas.cpp.

◆ contextMenuAboutToShow

void QgsPlotCanvas::contextMenuAboutToShow	(	QMenu *	menu,
		QgsPlotMouseEvent *	event )

signal

Emitted before the canvas context menu will be shown.

Can be used to extend the context menu.

◆ crs()

QgsCoordinateReferenceSystem QgsPlotCanvas::crs ( ) const

virtual

Returns the coordinate reference system (CRS) for map coordinates used by the canvas.

May return an invalid CRS if no CRS is associated with the canvas.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 263 of file qgsplotcanvas.cpp.

◆ event()

bool QgsPlotCanvas::event ( QEvent * e )

overrideprotected

Definition at line 312 of file qgsplotcanvas.cpp.

◆ keyPressEvent()

void QgsPlotCanvas::keyPressEvent ( QKeyEvent * e )

overrideprotected

Definition at line 105 of file qgsplotcanvas.cpp.

◆ keyReleaseEvent()

void QgsPlotCanvas::keyReleaseEvent ( QKeyEvent * e )

overrideprotected

Definition at line 130 of file qgsplotcanvas.cpp.

◆ mouseDoubleClickEvent()

void QgsPlotCanvas::mouseDoubleClickEvent ( QMouseEvent * e )

overrideprotected

Definition at line 141 of file qgsplotcanvas.cpp.

◆ mouseMoveEvent()

void QgsPlotCanvas::mouseMoveEvent ( QMouseEvent * e )

overrideprotected

Definition at line 217 of file qgsplotcanvas.cpp.

◆ mousePressEvent()

void QgsPlotCanvas::mousePressEvent ( QMouseEvent * e )

overrideprotected

Definition at line 154 of file qgsplotcanvas.cpp.

◆ mouseReleaseEvent()

void QgsPlotCanvas::mouseReleaseEvent ( QMouseEvent * e )

overrideprotected

Definition at line 185 of file qgsplotcanvas.cpp.

◆ panContentsBy()

void QgsPlotCanvas::panContentsBy	(	double	dx,
		double	dy )

virtual

Pans the plot contents by dx, dy in canvas units.

The default implementation does nothing.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 278 of file qgsplotcanvas.cpp.

◆ plotAreaChanged

void QgsPlotCanvas::plotAreaChanged ( )

signal

Emitted whenever the visible area of the plot is changed.

◆ refresh

void QgsPlotCanvas::refresh ( )

virtualslot

Updates and redraws the plot.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 86 of file qgsplotcanvas.cpp.

◆ resizeEvent()

void QgsPlotCanvas::resizeEvent ( QResizeEvent * e )

overrideprotected

Definition at line 198 of file qgsplotcanvas.cpp.

◆ scalePlot()

void QgsPlotCanvas::scalePlot ( double factor )

virtual

Scales the plot by a specified scale factor.

The default implementation does nothing.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 286 of file qgsplotcanvas.cpp.

◆ setTool()

void QgsPlotCanvas::setTool ( QgsPlotTool * tool )

Sets the interactive tool currently being used on the canvas.

Definition at line 230 of file qgsplotcanvas.cpp.

◆ snapToPlot()

QgsPointXY QgsPlotCanvas::snapToPlot ( QPoint point )

virtual

Snap a canvas point to the plot.

Returns an empty point if snapping was not possible.

Parameters

point point in canvas coordinates

Reimplemented in QgsElevationProfileCanvas.

Definition at line 294 of file qgsplotcanvas.cpp.

◆ toCanvasCoordinates()

QgsPointXY QgsPlotCanvas::toCanvasCoordinates ( const QgsPoint & point ) const

virtual

Converts a point in map coordinates to the associated canvas point.

May return an empty point if the map point cannot be converted to a canvas point.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 273 of file qgsplotcanvas.cpp.

◆ toMapCoordinates()

QgsPoint QgsPlotCanvas::toMapCoordinates ( const QgsPointXY & point ) const

virtual

Converts a point on the canvas to the associated map coordinate.

May return an empty point if the canvas point cannot be converted to a map point.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 268 of file qgsplotcanvas.cpp.

◆ tool()

QgsPlotTool * QgsPlotCanvas::tool ( )

Returns the currently active tool.

Definition at line 258 of file qgsplotcanvas.cpp.

◆ toolChanged

void QgsPlotCanvas::toolChanged ( QgsPlotTool * newTool )

signal

Emitted when the plot tool is changed.

◆ unsetTool()

void QgsPlotCanvas::unsetTool ( QgsPlotTool * tool )

Unset the current tool.

This is called from destructor of plot tools to make sure that this map tool won't be used any more.

You don't have to call it manually, QgsPlotTool takes care of it.

Definition at line 248 of file qgsplotcanvas.cpp.

◆ viewportEvent()

bool QgsPlotCanvas::viewportEvent ( QEvent * event )

overrideprotected

Definition at line 299 of file qgsplotcanvas.cpp.

◆ wheelEvent()

void QgsPlotCanvas::wheelEvent ( QWheelEvent * e )

overrideprotected

Definition at line 203 of file qgsplotcanvas.cpp.

◆ wheelZoom()

void QgsPlotCanvas::wheelZoom ( QWheelEvent * event )

protectedvirtual

Zoom plot from a mouse wheel event.

The default implementation does nothing.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 308 of file qgsplotcanvas.cpp.

◆ willBeDeleted

void QgsPlotCanvas::willBeDeleted ( )

signal

Emitted in the destructor when the canvas is about to be deleted, but is still in a perfectly valid state.

◆ zoomToRect()

void QgsPlotCanvas::zoomToRect ( const QRectF & rect )

virtual

Zooms the plot to the specified rect in canvas units.

The default implementation does nothing.

Reimplemented in QgsElevationProfileCanvas.

Definition at line 290 of file qgsplotcanvas.cpp.

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

/build/qgis-3.99.0+git20251210+2fe06baccd8+99sid/src/gui/plot/qgsplotcanvas.h
/build/qgis-3.99.0+git20251210+2fe06baccd8+99sid/src/gui/plot/qgsplotcanvas.cpp

Public Slots

Signals

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ QgsPlotCanvas()

◆ ~QgsPlotCanvas()

Member Function Documentation

◆ cancelJobs()

◆ centerPlotOn()

◆ contextMenuAboutToShow

◆ crs()

◆ event()

◆ keyPressEvent()

◆ keyReleaseEvent()

◆ mouseDoubleClickEvent()

◆ mouseMoveEvent()

◆ mousePressEvent()

◆ mouseReleaseEvent()

◆ panContentsBy()

◆ plotAreaChanged

◆ refresh

◆ resizeEvent()

◆ scalePlot()

◆ setTool()

◆ snapToPlot()

◆ toCanvasCoordinates()

◆ toMapCoordinates()

◆ tool()

◆ toolChanged

◆ unsetTool()

◆ viewportEvent()

◆ wheelEvent()

◆ wheelZoom()

◆ willBeDeleted

◆ zoomToRect()