Map canvas is a class for displaying all GIS data types on a canvas. More...

#include <qgsmapcanvas.h>

Classes
class	CanvasProperties

Public Types
enum	WheelAction { WheelZoom, WheelZoomAndRecenter, WheelZoomToMouseCursor, WheelNothing }

Public Slots
void	refresh ()
	Repaints the canvas map.
void	selectionChangedSlot ()
	Receives signal about selection change, and pass it on with layer info.
void	saveAsImage (QString theFileName, QPixmap *QPixmap=0, QString="PNG")
	Save the convtents of the map canvas to disk as an image.
void	layerStateChange ()
	This slot is connected to the visibility change of one or more layers.
void	setRenderFlag (bool theFlag)
	Whether to suppress rendering or not.
bool	renderFlag ()
	State of render suppression flag.
bool	hasCrsTransformEnabled ()
	A simple helper method to find out if on the fly projections are enabled or not.
Q_DECL_DEPRECATED void	updateMap ()
void	stopRendering ()
	stop rendering (if there is any right now)
Q_DECL_DEPRECATED void	showError (QgsMapLayer *mapLayer)
void	readProject (const QDomDocument &)
	called to read map canvas settings from project
void	writeProject (QDomDocument &)
	called to write map canvas settings to project
void	getDatumTransformInfo (const QgsMapLayer *ml, const QString &srcAuthId, const QString &destAuthId)
	ask user about datum transformation

Signals
Q_DECL_DEPRECATED void	setProgress (int, int)
	Let the owner know how far we are with render operations.
void	xyCoordinates (const QgsPoint &p)
	emits current mouse position
void	scaleChanged (double)
	Emitted when the scale of the map changes.
void	extentsChanged ()
	Emitted when the extents of the map change.
void	renderComplete (QPainter *)
	Emitted when the canvas has rendered.
void	mapCanvasRefreshed ()
	Emitted when canvas finished a refresh request.
void	renderStarting ()
	Emitted when the canvas is about to be rendered.
void	layersChanged ()
	Emitted when a new set of layers has been received.
void	keyPressed (QKeyEvent *e)
	Emit key press event.
void	keyReleased (QKeyEvent *e)
	Emit key release event.
void	mapToolSet (QgsMapTool *tool)
	Emit map tool changed event.
void	mapToolSet (QgsMapTool newTool, QgsMapTool oldTool)
	Emit map tool changed with the old tool.
void	selectionChanged (QgsMapLayer *layer)
	Emitted when selection in any layer gets changed.
void	zoomLastStatusChanged (bool)
	Emitted when zoom last status changed.
void	zoomNextStatusChanged (bool)
	Emitted when zoom next status changed.
void	hasCrsTransformEnabledChanged (bool flag)
	Emitted when on-the-fly projection has been turned on/off.
void	destinationCrsChanged ()
	Emitted when map CRS has changed.
void	mapUnitsChanged ()
	Emmitted when map units are changed.

Public Member Functions
	QgsMapCanvas (QWidget parent=0, const char name=0)
	Constructor.
	~QgsMapCanvas ()
	Destructor.
void	setLayerSet (QList< QgsMapCanvasLayer > &layers)
void	setCurrentLayer (QgsMapLayer *layer)
void	updateOverview ()
void	enableOverviewMode (QgsMapOverviewCanvas *overview)
const QgsMapSettings &	mapSettings () const
	Get access to properties used for map rendering.
void	setCrsTransformEnabled (bool enabled)
	sets whether to use projections for this layer set
void	setDestinationCrs (const QgsCoordinateReferenceSystem &crs)
	sets destination coordinate reference system
const QgsLabelingResults *	labelingResults () const
	Get access to the labeling results (may be null)
void	setCachingEnabled (bool enabled)
	Set whether to cache images of rendered layers.
bool	isCachingEnabled () const
	Check whether images of rendered layers are curerently being cached.
void	clearCache ()
	Make sure to remove any rendered images from cache (does nothing if cache is not enabled)
void	setParallelRenderingEnabled (bool enabled)
	Set whether the layers are rendered in parallel or sequentially.
bool	isParallelRenderingEnabled () const
	Check whether the layers are rendered in parallel or sequentially.
void	setMapUpdateInterval (int timeMiliseconds)
	Set how often map preview should be updated while it is being rendered (in milliseconds)
int	mapUpdateInterval () const
	Find out how often map preview should be updated while it is being rendered (in milliseconds)
QgsMapCanvasMap *	map ()
Q_DECL_DEPRECATED QgsMapRenderer *	mapRenderer ()
Q_DECL_DEPRECATED QPaintDevice &	canvasPaintDevice ()
	Accessor for the canvas paint device.
double	scale ()
	Get the last reported scale of the canvas.
Q_DECL_DEPRECATED void	clear ()
	Clear the map canvas.
double	mapUnitsPerPixel () const
	Returns the mapUnitsPerPixel (map units per pixel) for the canvas.
QgsRectangle	extent () const
	Returns the current zoom exent of the map canvas.
QgsRectangle	fullExtent () const
	Returns the combined exent for all layers on the map canvas.
void	setExtent (const QgsRectangle &r)
	Set the extent of the map canvas.
void	zoomToFullExtent ()
	Zoom to the full extent of all layers.
void	zoomToPreviousExtent ()
	Zoom to the previous extent (view)
void	zoomToNextExtent ()
	Zoom to the next extent (view)
void	clearExtentHistory ()
void	zoomToSelected (QgsVectorLayer *layer=NULL)
	Zoom to the extent of the selected features of current (vector) layer.
void	panToSelected (QgsVectorLayer *layer=NULL)
	Pan to the selected features of current (vector) layer keeping same extent.
void	setMapTool (QgsMapTool *mapTool)
	Sets the map tool currently being used on the canvas.
void	unsetMapTool (QgsMapTool *mapTool)
	Unset the current map tool or last non zoom tool.
QgsMapTool *	mapTool ()
	Returns the currently active tool.
virtual void	setCanvasColor (const QColor &_newVal)
	Write property of QColor bgColor.
virtual QColor	canvasColor () const
	Read property of QColor bgColor.
void	setSelectionColor (const QColor &color)
	Set color of selected vector features.
void	updateScale ()
	Emits signal scaleChanged to update scale in main window.
Q_DECL_DEPRECATED void	updateFullExtent ()
	Updates the full extent.
QgsMapLayer *	layer (int index)
	return the map layer at position index in the layer stack
int	layerCount () const
	return number of layers on the map
QList< QgsMapLayer * >	layers () const
	return list of layers within map canvas.
void	freeze (bool frz=true)
bool	isFrozen ()
Q_DECL_DEPRECATED void	setDirty (bool _dirty)
	Flag the canvas as dirty and needed a refresh.
Q_DECL_DEPRECATED bool	isDirty () const
	Return the state of the canvas (dirty or not)
void	setMapUnits (QGis::UnitType mapUnits)
	Set map units (needed by project properties dialog)
QGis::UnitType	mapUnits () const
	Get the current canvas map units.
const QgsMapToPixel *	getCoordinateTransform ()
	Get the current coordinate transform.
bool	isDrawing ()
	Find out whether rendering is in progress.
QgsMapLayer *	currentLayer ()
	returns current layer (set by legend widget)
void	setWheelAction (WheelAction action, double factor=2)
	set wheel action and zoom factor (should be greater than 1)
void	zoomIn ()
	Zoom in with fixed factor.
void	zoomOut ()
	Zoom out with fixed factor.
void	zoomScale (double scale)
	Zoom to a specific scale.
void	zoomByFactor (double scaleFactor, const QgsPoint *center=0)
	Zoom with the factor supplied.
void	zoomWithCenter (int x, int y, bool zoomIn)
	Zooms in/out with a given center.
void	enableAntiAliasing (bool theFlag)
	used to determine if anti-aliasing is enabled or not
bool	antiAliasingEnabled () const
	true if antialising is enabled
Q_DECL_DEPRECATED void	useImageToRender (bool theFlag)
	Select which Qt class to render with.
void	panActionEnd (QPoint releasePoint)
	Ends pan action and redraws the canvas.
void	panAction (QMouseEvent *event)
	Called when mouse is moving and pan is activated.
QPoint	mouseLastXY ()
	returns last position of mouse cursor
void	setPreviewModeEnabled (bool previewEnabled)
	Enables a preview mode for the map canvas.
bool	previewModeEnabled () const
	Returns whether a preview mode is enabled for the map canvas.
void	setPreviewMode (QgsPreviewEffect::PreviewMode mode)
	Sets a preview mode for the map canvas.
QgsPreviewEffect::PreviewMode	previewMode () const
	Returns the current preview mode for the map canvas.

Protected Member Functions
void	keyPressEvent (QKeyEvent *e)
	Overridden key press event.
void	keyReleaseEvent (QKeyEvent *e)
	Overridden key release event.
void	mouseDoubleClickEvent (QMouseEvent *e)
	Overridden mouse double click event.
void	mouseMoveEvent (QMouseEvent *e)
	Overridden mouse move event.
void	mousePressEvent (QMouseEvent *e)
	Overridden mouse press event.
void	mouseReleaseEvent (QMouseEvent *e)
	Overridden mouse release event.
void	wheelEvent (QWheelEvent *e)
	Overridden mouse wheel event.
void	resizeEvent (QResizeEvent *e)
	Overridden resize event.
void	paintEvent (QPaintEvent *e)
	Overridden paint event.
void	dragEnterEvent (QDragEnterEvent *e)
	Overridden drag enter event.
void	moveCanvasContents (bool reset=false)
	called when panning is in action, reset indicates end of panning
void	updateCanvasItemPositions ()
	called on resize or changed extent to notify canvas items to change their rectangle
void	connectNotify (const char *signal)
	debugging member invoked when a connect() is made to this object
void	updateDatumTransformEntries ()
	Make sure the datum transform store is properly populated.

Protected Attributes
std::auto_ptr< CanvasProperties >	mCanvasProperties
	Handle pattern for implementation object.

Detailed Description

Map canvas is a class for displaying all GIS data types on a canvas.

Member Enumeration Documentation

enum QgsMapCanvas::WheelAction

Enumerator:

WheelZoom
WheelZoomAndRecenter
WheelZoomToMouseCursor
WheelNothing

Constructor & Destructor Documentation

QgsMapCanvas::QgsMapCanvas	(	QWidget *	parent = `0`,
		const char *	name = `0`
	)

Constructor.

QgsMapCanvas::~QgsMapCanvas ( )

Destructor.

Member Function Documentation

bool QgsMapCanvas::antiAliasingEnabled ( ) const

inline

true if antialising is enabled

QColor QgsMapCanvas::canvasColor ( ) const

virtual

Read property of QColor bgColor.

QPaintDevice & QgsMapCanvas::canvasPaintDevice ( )

Accessor for the canvas paint device.

Deprecated:: since 2.4

void QgsMapCanvas::clear ( )

Clear the map canvas.

Deprecated:: since 2.4 - use refresh() - clear does the same thing

void QgsMapCanvas::clearCache ( )

Make sure to remove any rendered images from cache (does nothing if cache is not enabled)

Note: added in 2.4

void QgsMapCanvas::clearExtentHistory ( )

void QgsMapCanvas::connectNotify ( const char * signal )

protected

debugging member invoked when a connect() is made to this object

QgsMapLayer * QgsMapCanvas::currentLayer ( )

returns current layer (set by legend widget)

void QgsMapCanvas::destinationCrsChanged ( )

signal

Emitted when map CRS has changed.

Note: added in 2.4

void QgsMapCanvas::dragEnterEvent ( QDragEnterEvent * e )

protected

Overridden drag enter event.

void QgsMapCanvas::enableAntiAliasing ( bool theFlag )

used to determine if anti-aliasing is enabled or not

void QgsMapCanvas::enableOverviewMode ( QgsMapOverviewCanvas * overview )

QgsRectangle QgsMapCanvas::extent ( ) const

Returns the current zoom exent of the map canvas.

void QgsMapCanvas::extentsChanged ( )

signal

Emitted when the extents of the map change.

void QgsMapCanvas::freeze ( bool frz = true )

Freeze/thaw the map canvas. This is used to prevent the canvas from responding to events while layers are being added/removed etc.

Parameters

frz	Boolean specifying if the canvas should be frozen (true) or thawed (false). Default is true.

QgsRectangle QgsMapCanvas::fullExtent ( ) const

Returns the combined exent for all layers on the map canvas.

const QgsMapToPixel * QgsMapCanvas::getCoordinateTransform ( )

Get the current coordinate transform.

void QgsMapCanvas::getDatumTransformInfo	(	const QgsMapLayer *	ml,
		const QString &	srcAuthId,
		const QString &	destAuthId
	)

slot

ask user about datum transformation

Ask user which datum transform to use.

bool QgsMapCanvas::hasCrsTransformEnabled ( )

slot

A simple helper method to find out if on the fly projections are enabled or not.

void QgsMapCanvas::hasCrsTransformEnabledChanged ( bool flag )

signal

Emitted when on-the-fly projection has been turned on/off.

Note: added in 2.4

bool QgsMapCanvas::isCachingEnabled ( ) const

Check whether images of rendered layers are curerently being cached.

Note: added in 2.4

bool QgsMapCanvas::isDirty ( ) const

Return the state of the canvas (dirty or not)

Deprecated:: since 2.4 - dirty flag is not kept anymore - always returns false

bool QgsMapCanvas::isDrawing ( )

Find out whether rendering is in progress.

bool QgsMapCanvas::isFrozen ( )

Accessor for frozen status of canvas

bool QgsMapCanvas::isParallelRenderingEnabled ( ) const

Check whether the layers are rendered in parallel or sequentially.

Note: added in 2.4

void QgsMapCanvas::keyPressed ( QKeyEvent * e )

signal

Emit key press event.

void QgsMapCanvas::keyPressEvent ( QKeyEvent * e )

protected

Overridden key press event.

void QgsMapCanvas::keyReleased ( QKeyEvent * e )

signal

Emit key release event.

void QgsMapCanvas::keyReleaseEvent ( QKeyEvent * e )

protected

Overridden key release event.

const QgsLabelingResults * QgsMapCanvas::labelingResults ( ) const

Get access to the labeling results (may be null)

Note: added in 2.4

QgsMapLayer * QgsMapCanvas::layer ( int index )

return the map layer at position index in the layer stack

int QgsMapCanvas::layerCount ( ) const

return number of layers on the map

QList< QgsMapLayer * > QgsMapCanvas::layers ( ) const

return list of layers within map canvas.

void QgsMapCanvas::layersChanged ( )

signal

Emitted when a new set of layers has been received.

void QgsMapCanvas::layerStateChange ( )

slot

This slot is connected to the visibility change of one or more layers.

QgsMapCanvasMap * QgsMapCanvas::map ( )

Deprecated:: since 2.4 - there could be more than just one "map" items

void QgsMapCanvas::mapCanvasRefreshed ( )

signal

Emitted when canvas finished a refresh request.

QgsMapRenderer * QgsMapCanvas::mapRenderer ( )

Deprecated:: since 2.4 - use mapSettings() for anything related to current renderer settings / SIP: removed /Transfer/ because it crashes after few calls to iface.mapCanvas().mapRenderer().hasCrsTransformEnabled() / and in fact there is no transfer of ownership from c++ to python! / Actually the problem comes from the fact that "hasCrsTransformEnabled" is both a signal and a normal method / /KeepReference/ is necessary because otherwise mapRenderer().hasCrsTransformEnabled() was crashing

const QgsMapSettings & QgsMapCanvas::mapSettings ( ) const

Get access to properties used for map rendering.

Note: added in 2.4

QgsMapTool * QgsMapCanvas::mapTool ( )

Returns the currently active tool.

void QgsMapCanvas::mapToolSet ( QgsMapTool * tool )

signal

Emit map tool changed event.

void QgsMapCanvas::mapToolSet	(	QgsMapTool *	newTool,
		QgsMapTool *	oldTool
	)

signal

Emit map tool changed with the old tool.

Note: added in 2.3

QGis::UnitType QgsMapCanvas::mapUnits ( ) const

Get the current canvas map units.

void QgsMapCanvas::mapUnitsChanged ( )

signal

Emmitted when map units are changed.

Note: added in 2.4

double QgsMapCanvas::mapUnitsPerPixel ( ) const

Returns the mapUnitsPerPixel (map units per pixel) for the canvas.

int QgsMapCanvas::mapUpdateInterval ( ) const

Find out how often map preview should be updated while it is being rendered (in milliseconds)

Note: added in 2.4

void QgsMapCanvas::mouseDoubleClickEvent ( QMouseEvent * e )

protected

Overridden mouse double click event.

QPoint QgsMapCanvas::mouseLastXY ( )

returns last position of mouse cursor

void QgsMapCanvas::mouseMoveEvent ( QMouseEvent * e )

protected

Overridden mouse move event.

void QgsMapCanvas::mousePressEvent ( QMouseEvent * e )

protected

Overridden mouse press event.

void QgsMapCanvas::mouseReleaseEvent ( QMouseEvent * e )

protected

Overridden mouse release event.

void QgsMapCanvas::moveCanvasContents ( bool reset = false )

protected

called when panning is in action, reset indicates end of panning

void QgsMapCanvas::paintEvent ( QPaintEvent * e )

protected

Overridden paint event.

void QgsMapCanvas::panAction ( QMouseEvent * event )

Called when mouse is moving and pan is activated.

void QgsMapCanvas::panActionEnd ( QPoint releasePoint )

Ends pan action and redraws the canvas.

void QgsMapCanvas::panToSelected ( QgsVectorLayer * layer = NULL )

Pan to the selected features of current (vector) layer keeping same extent.

QgsPreviewEffect::PreviewMode QgsMapCanvas::previewMode ( ) const

Returns the current preview mode for the map canvas.

This setting only has an effect if previewModeEnabled is true.

Returns: preview mode for map canvas

See Also: setPreviewMode; previewModeEnabled

Note: added in 2.3

bool QgsMapCanvas::previewModeEnabled ( ) const

Returns whether a preview mode is enabled for the map canvas.

Returns: true if a preview mode is currently enabled

See Also: setPreviewModeEnabled; previewMode

Note: added in 2.3

void QgsMapCanvas::readProject ( const QDomDocument & doc )

slot

called to read map canvas settings from project

void QgsMapCanvas::refresh ( )

slot

Repaints the canvas map.

void QgsMapCanvas::renderComplete ( QPainter * )

signal

Emitted when the canvas has rendered.

Passes a pointer to the painter on which the map was drawn. This is useful for plugins that wish to draw on the map after it has been rendered. Passing the painter allows plugins to work when the map is being rendered onto a pixmap other than the mapCanvas own pixmap member.TODO: deprecate when decorations are reimplemented as map canvas items

anything related to rendering progress is not visible outside of map canvas
additional drawing shall be done directly within the renderer job or independently as a map canvas item

bool QgsMapCanvas::renderFlag ( )

inlineslot

State of render suppression flag.

void QgsMapCanvas::renderStarting ( )

signal

Emitted when the canvas is about to be rendered.

void QgsMapCanvas::resizeEvent ( QResizeEvent * e )

protected

Overridden resize event.

void QgsMapCanvas::saveAsImage	(	QString	theFileName,
		QPixmap *	QPixmap = `0`,
		QString	theFormat = `"PNG"`
	)

slot

Save the convtents of the map canvas to disk as an image.

double QgsMapCanvas::scale ( )

Get the last reported scale of the canvas.

void QgsMapCanvas::scaleChanged ( double )

signal

Emitted when the scale of the map changes.

void QgsMapCanvas::selectionChanged ( QgsMapLayer * layer )

signal

Emitted when selection in any layer gets changed.

void QgsMapCanvas::selectionChangedSlot ( )

slot

Receives signal about selection change, and pass it on with layer info.

void QgsMapCanvas::setCachingEnabled ( bool enabled )

Set whether to cache images of rendered layers.

Note: added in 2.4

void QgsMapCanvas::setCanvasColor ( const QColor & theColor )

virtual

Write property of QColor bgColor.

void QgsMapCanvas::setCrsTransformEnabled ( bool enabled )

sets whether to use projections for this layer set

Note: added in 2.4

void QgsMapCanvas::setCurrentLayer ( QgsMapLayer * layer )

void QgsMapCanvas::setDestinationCrs ( const QgsCoordinateReferenceSystem & crs )

sets destination coordinate reference system

Note: added in 2.4

void QgsMapCanvas::setDirty ( bool _dirty )

Flag the canvas as dirty and needed a refresh.

Deprecated:: since 2.4 - use refresh() to trigger a refresh (clients should not decide explicitly whether canvas is dirty or not)

void QgsMapCanvas::setExtent ( const QgsRectangle & r )

Set the extent of the map canvas.

void QgsMapCanvas::setLayerSet ( QList< QgsMapCanvasLayer > & layers )

void QgsMapCanvas::setMapTool ( QgsMapTool * mapTool )

Sets the map tool currently being used on the canvas.

void QgsMapCanvas::setMapUnits ( QGis::UnitType mapUnits )

Set map units (needed by project properties dialog)

void QgsMapCanvas::setMapUpdateInterval ( int timeMiliseconds )

Set how often map preview should be updated while it is being rendered (in milliseconds)

Note: added in 2.4

void QgsMapCanvas::setParallelRenderingEnabled ( bool enabled )

Set whether the layers are rendered in parallel or sequentially.

Note: added in 2.4

void QgsMapCanvas::setPreviewMode ( QgsPreviewEffect::PreviewMode mode )

Sets a preview mode for the map canvas.

This setting only has an effect if previewModeEnabled is true.

Parameters

mode	preview mode for the canvas

See Also: previewMode; setPreviewModeEnabled; previewModeEnabled

Note: added in 2.3

void QgsMapCanvas::setPreviewModeEnabled ( bool previewEnabled )

Enables a preview mode for the map canvas.

Parameters

previewEnabled set to true to enable a preview mode

See Also: setPreviewMode

Note: added in 2.3

Q_DECL_DEPRECATED void QgsMapCanvas::setProgress	(	int	,
		int
	)

signal

Let the owner know how far we are with render operations.

Deprecated:: since 2.4 - already unused in 2.0 anyway

void QgsMapCanvas::setRenderFlag ( bool theFlag )

slot

Whether to suppress rendering or not.

void QgsMapCanvas::setSelectionColor ( const QColor & color )

Set color of selected vector features.

Note: added in 2.4

void QgsMapCanvas::setWheelAction	(	WheelAction	action,
		double	factor = `2`
	)

set wheel action and zoom factor (should be greater than 1)

void QgsMapCanvas::showError ( QgsMapLayer * mapLayer )

slot

Deprecated:: since 2.4 - does nothing - errors are reported by different means

void QgsMapCanvas::stopRendering ( )

slot

stop rendering (if there is any right now)

Note: added in 2.4

void QgsMapCanvas::unsetMapTool ( QgsMapTool * mapTool )

Unset the current map tool or last non zoom tool.

This is called from destructor of map tools to make sure that this map tool won't be used any more. You don't have to call it manualy, QgsMapTool takes care of it.

void QgsMapCanvas::updateCanvasItemPositions ( )

protected

called on resize or changed extent to notify canvas items to change their rectangle

void QgsMapCanvas::updateDatumTransformEntries ( )

protected

Make sure the datum transform store is properly populated.

Q_DECL_DEPRECATED void QgsMapCanvas::updateFullExtent ( )

inline

Updates the full extent.

Deprecated:: since v2.4 - does nothing

void QgsMapCanvas::updateMap ( )

slot

Deprecated:: in 2.4 - does nothing - kept for API compatibility

void QgsMapCanvas::updateOverview ( )

void QgsMapCanvas::updateScale ( )

Emits signal scaleChanged to update scale in main window.

void QgsMapCanvas::useImageToRender ( bool theFlag )

Select which Qt class to render with.

Deprecated:: since 2.4 - does nothing because now we always render to QImage

void QgsMapCanvas::wheelEvent ( QWheelEvent * e )

protected

Overridden mouse wheel event.

void QgsMapCanvas::writeProject ( QDomDocument & doc )

slot

called to write map canvas settings to project

void QgsMapCanvas::xyCoordinates ( const QgsPoint & p )

signal

emits current mouse position

Note: changed in 1.3

void QgsMapCanvas::zoomByFactor	(	double	scaleFactor,
		const QgsPoint *	center = `0`
	)

Zoom with the factor supplied.

Factor > 1 zooms out, interval (0,1) zooms in If point is given, re-center on it

void QgsMapCanvas::zoomIn ( )

Zoom in with fixed factor.

void QgsMapCanvas::zoomLastStatusChanged ( bool )

signal

Emitted when zoom last status changed.

void QgsMapCanvas::zoomNextStatusChanged ( bool )

signal

Emitted when zoom next status changed.

void QgsMapCanvas::zoomOut ( )

Zoom out with fixed factor.

void QgsMapCanvas::zoomScale ( double scale )

Zoom to a specific scale.

void QgsMapCanvas::zoomToFullExtent ( )

Zoom to the full extent of all layers.

void QgsMapCanvas::zoomToNextExtent ( )

Zoom to the next extent (view)

void QgsMapCanvas::zoomToPreviousExtent ( )

Zoom to the previous extent (view)

void QgsMapCanvas::zoomToSelected ( QgsVectorLayer * layer = NULL )

Zoom to the extent of the selected features of current (vector) layer.

Parameters

layer optionally specify different than current layer

void QgsMapCanvas::zoomWithCenter	(	int	x,
		int	y,
		bool	zoomIn
	)

Zooms in/out with a given center.

Member Data Documentation

std::auto_ptr<CanvasProperties> QgsMapCanvas::mCanvasProperties

protected

Handle pattern for implementation object.

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

/tmp/buildd/qgis-2.6.0+wheezy1/src/gui/qgsmapcanvas.h
/tmp/buildd/qgis-2.6.0+wheezy1/src/gui/qgsmapcanvas.cpp

Classes

Public Types

Public Slots

Signals

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation