QgsMapMouseEvent Class Reference

A QgsMapMouseEvent is the result of a user interaction with the mouse on a QgsMapCanvas. More...

#include <qgsmapmouseevent.h>

Inheritance diagram for QgsMapMouseEvent:

Public Member Functions
	QgsMapMouseEvent (QgsMapCanvas *mapCanvas, QEvent::Type type, QPoint pos, Qt::MouseButton button=Qt::NoButton, Qt::MouseButtons buttons=Qt::NoButton, Qt::KeyboardModifiers modifiers=Qt::NoModifier)
	Creates a new QgsMapMouseEvent.
	QgsMapMouseEvent (QgsMapCanvas *mapCanvas, QMouseEvent *event)
	Creates a new QgsMapMouseEvent.
bool	isSnapped () const
	Returns true if there is a snapped point cached.
QgsPointXY	mapPoint () const
	mapPoint returns the point in coordinates
QgsPointLocator::Match	mapPointMatch () const
	Returns the matching data from the most recently snapped point.
QgsPointXY	originalMapPoint () const
	Returns the original, unmodified map point of the mouse cursor.
QPoint	originalPixelPoint () const
	The unsnapped, real mouse cursor position in pixel coordinates.
QPoint	pixelPoint () const
	The snapped mouse cursor in pixel coordinates.
void	setMapPoint (const QgsPointXY &point)
	Set the (snapped) point this event points to in map coordinates.
QgsPointXY	snapPoint ()
	snapPoint will snap the points using the map canvas snapping utils configuration
void	snapToGrid (double precision, const QgsCoordinateReferenceSystem &crs)
	Snaps the mapPoint to a grid with the given precision.

Detailed Description

A QgsMapMouseEvent is the result of a user interaction with the mouse on a QgsMapCanvas.

It is sent whenever the user moves, clicks, releases or double clicks the mouse. In addition to the coordinates in pixel space it also knows the coordinates in the mapcanvas' CRS as well as it knows the concept of snapping.

Definition at line 35 of file qgsmapmouseevent.h.

Constructor & Destructor Documentation

QgsMapMouseEvent() [1/2]

QgsMapMouseEvent::QgsMapMouseEvent	(	QgsMapCanvas *	mapCanvas,
		QMouseEvent *	event
	)

Creates a new QgsMapMouseEvent.

Should only be required to be called from the QgsMapCanvas.

Parameters

mapCanvas	The map canvas on which the event occurred
event	The original mouse event

Definition at line 23 of file qgsmapmouseevent.cpp.

QgsMapMouseEvent() [2/2]

QgsMapMouseEvent::QgsMapMouseEvent	(	QgsMapCanvas *	mapCanvas,
		QEvent::Type	type,
		QPoint	pos,
		Qt::MouseButton	button = Qt::NoButton,
		Qt::MouseButtons	buttons = Qt::NoButton,
		Qt::KeyboardModifiers	modifiers = Qt::NoModifier
	)

Creates a new QgsMapMouseEvent.

Should only be required to be called from the QgsMapCanvas.

Parameters

mapCanvas	The map canvas on which the event occurred
type	The type of the event
pos	The pixel position of the mouse
button	The pressed button
buttons	Further buttons that are pressed
modifiers	Keyboard modifiers

Definition at line 33 of file qgsmapmouseevent.cpp.

Member Function Documentation

isSnapped()

bool QgsMapMouseEvent::isSnapped ( ) const

inline

Returns true if there is a snapped point cached.

Will only be useful after snapPoint has previously been called.

Returns

true if there is a snapped point cached.

Definition at line 79 of file qgsmapmouseevent.h.

mapPoint()

QgsPointXY QgsMapMouseEvent::mapPoint ( ) const

inline

mapPoint returns the point in coordinates

Returns

the point in map coordinates, after snapping if requested in the event.

Definition at line 85 of file qgsmapmouseevent.h.

mapPointMatch()

QgsPointLocator::Match QgsMapMouseEvent::mapPointMatch ( ) const

inline

Returns the matching data from the most recently snapped point.

Returns

the snapping data structure

Note

This method returns the most recent snap match. It must follow a call to snapPoint() in order to have a recent snap result available.

Definition at line 93 of file qgsmapmouseevent.h.

originalMapPoint()

QgsPointXY QgsMapMouseEvent::originalMapPoint ( ) const

inline

Returns the original, unmodified map point of the mouse cursor.

Returns

The cursor position in map coordinates.

Definition at line 108 of file qgsmapmouseevent.h.

originalPixelPoint()

QPoint QgsMapMouseEvent::originalPixelPoint ( ) const

inline

The unsnapped, real mouse cursor position in pixel coordinates.

Alias to pos()

Returns

Mouse position in pixel coordinates

Definition at line 123 of file qgsmapmouseevent.h.

pixelPoint()

QPoint QgsMapMouseEvent::pixelPoint ( ) const

inline

The snapped mouse cursor in pixel coordinates.

Returns

The snapped mouse cursor position in pixel coordinates.

Definition at line 115 of file qgsmapmouseevent.h.

setMapPoint()

void QgsMapMouseEvent::setMapPoint

(

const QgsPointXY &

point

)

Set the (snapped) point this event points to in map coordinates.

The point in pixel coordinates will be calculated accordingly.

Parameters

point

The point in map coordinates

Definition at line 68 of file qgsmapmouseevent.cpp.

snapPoint()

QgsPointXY QgsMapMouseEvent::snapPoint

(

)

snapPoint will snap the points using the map canvas snapping utils configuration

Note

if snapping did not succeeded, the map point will be reset to its original position

Definition at line 43 of file qgsmapmouseevent.cpp.

snapToGrid()

void QgsMapMouseEvent::snapToGrid	(	double	precision,
		const QgsCoordinateReferenceSystem &	crs
	)

Snaps the mapPoint to a grid with the given precision.

The snapping will be done in the specified crs. If this crs is different from the mapCanvas crs, it will be reprojected on the fly.

Since

QGIS 3.4

Definition at line 74 of file qgsmapmouseevent.cpp.

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

• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/gui/qgsmapmouseevent.h
• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/gui/qgsmapmouseevent.cpp