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82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
/***************************************************************************
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qgsmapmouseevent.cpp - mouse event in map coordinates and ability to snap
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----------------------
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begin : October 2014
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copyright : (C) Denis Rouzaud
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email : denis.rouzaud@gmail.com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "qgsmapmouseevent.h"
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#include "qgsmapcanvas.h"
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#include "qgssnappingutils.h"
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#include "qgssnappingconfig.h"
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QgsMapMouseEvent::QgsMapMouseEvent( QgsMapCanvas *mapCanvas, QMouseEvent *event )
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: QMouseEvent( event->type(), event->pos(), event->button(), event->buttons(), event->modifiers() )
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, mHasCachedSnapResult( false )
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, mOriginalMapPoint( mapCanvas ? mapCanvas->mapSettings().mapToPixel().toMapCoordinates( event->pos() ) : QgsPointXY() )
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, mMapPoint( mOriginalMapPoint )
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, mPixelPoint( event->pos() )
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, mMapCanvas( mapCanvas )
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{
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}
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QgsMapMouseEvent::QgsMapMouseEvent( QgsMapCanvas *mapCanvas, QEvent::Type type, QPoint pos, Qt::MouseButton button, Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers )
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: QMouseEvent( type, pos, button, buttons, modifiers )
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, mHasCachedSnapResult( false )
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, mOriginalMapPoint( mapCanvas ? mapCanvas->mapSettings().mapToPixel().toMapCoordinates( pos ) : QgsPointXY() )
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, mMapPoint( mOriginalMapPoint )
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, mPixelPoint( pos )
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, mMapCanvas( mapCanvas )
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{
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}
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QgsPointXY QgsMapMouseEvent::snapPoint()
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{
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// Use cached result
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if ( mHasCachedSnapResult )
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return mMapPoint;
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mHasCachedSnapResult = true;
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QgsSnappingUtils *snappingUtils = mMapCanvas->snappingUtils();
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mSnapMatch = snappingUtils->snapToMap( mMapPoint );
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if ( mSnapMatch.isValid() )
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{
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mMapPoint = mSnapMatch.point();
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mPixelPoint = mapToPixelCoordinates( mMapPoint );
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}
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else
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{
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mMapPoint = mOriginalMapPoint;
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mPixelPoint = pos();
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}
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return mMapPoint;
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}
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void QgsMapMouseEvent::setMapPoint( const QgsPointXY &point )
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{
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mMapPoint = point;
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mPixelPoint = mapToPixelCoordinates( point );
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}
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QPoint QgsMapMouseEvent::mapToPixelCoordinates( const QgsPointXY &point )
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{
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double x = point.x(), y = point.y();
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mMapCanvas->mapSettings().mapToPixel().transformInPlace( x, y );
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return QPoint( std::round( x ), std::round( y ) );
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}
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