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qgsmaptoolmovefeature.cpp
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qgsmaptoolmovefeature.cpp
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/***************************************************************************
qgsmaptoolmovefeature.cpp - map tool for translating features by mouse drag
---------------------
begin : Juli 2007
copyright : (C) 2007 by Marco Hugentobler
email : marco dot hugentobler at karto dot baug dot ethz dot ch
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsmaptoolmovefeature.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h"
#include "qgsrubberband.h"
#include "qgsvectordataprovider.h"
#include "qgsvectorlayer.h"
#include "qgstolerance.h"
#include <QMessageBox>
#include <QMouseEvent>
#include <QSettings>
#include <limits>
QgsMapToolMoveFeature::QgsMapToolMoveFeature( QgsMapCanvas* canvas ): QgsMapToolEdit( canvas ), mRubberBand( 0 )
{
}
QgsMapToolMoveFeature::~QgsMapToolMoveFeature()
{
delete mRubberBand;
}
void QgsMapToolMoveFeature::canvasMoveEvent( QMouseEvent * e )
{
if ( mRubberBand )
{
QgsPoint pointCanvasCoords = toMapCoordinates( e->pos() );
double offsetX = pointCanvasCoords.x() - mStartPointMapCoords.x();
double offsetY = pointCanvasCoords.y() - mStartPointMapCoords.y();
mRubberBand->setTranslationOffset( offsetX, offsetY );
mRubberBand->updatePosition();
mRubberBand->update();
}
}
void QgsMapToolMoveFeature::canvasPressEvent( QMouseEvent * e )
{
delete mRubberBand;
mRubberBand = 0;
QgsVectorLayer* vlayer = currentVectorLayer();
if ( !vlayer )
{
return;
}
if ( !vlayer->isEditable() )
{
QMessageBox::information( 0, tr( "Layer not editable" ),
tr( "Cannot edit the vector layer. Use 'Toggle Editing' to make it editable." )
);
return;
}
//find first geometry under mouse cursor and store iterator to it
QgsPoint layerCoords = toLayerCoordinates( vlayer, e->pos() );
QSettings settings;
double searchRadius = QgsTolerance::vertexSearchRadius( mCanvas->currentLayer(), mCanvas->mapRenderer() );
QgsRectangle selectRect( layerCoords.x() - searchRadius, layerCoords.y() - searchRadius,
layerCoords.x() + searchRadius, layerCoords.y() + searchRadius );
if ( vlayer->selectedFeatureCount() == 0 )
{
vlayer->select( QgsAttributeList(), selectRect, true );
//find the closest feature
QgsGeometry* pointGeometry = QgsGeometry::fromPoint( layerCoords );
if ( !pointGeometry )
{
return;
}
double minDistance = std::numeric_limits<double>::max();
QgsFeature cf;
QgsFeature f;
while ( vlayer->nextFeature( f ) )
{
if ( f.geometry() )
{
double currentDistance = pointGeometry->distance( *f.geometry() );
if ( currentDistance < minDistance )
{
minDistance = currentDistance;
cf = f;
}
}
}
delete pointGeometry;
if ( minDistance == std::numeric_limits<double>::max() )
{
return;
}
mMovedFeatures.clear();
mMovedFeatures << cf.id(); //todo: take the closest feature, not the first one...
mRubberBand = createRubberBand();
mRubberBand->setToGeometry( cf.geometry(), vlayer );
}
else
{
mMovedFeatures = vlayer->selectedFeaturesIds();
mRubberBand = createRubberBand();
for ( int i = 0; i < vlayer->selectedFeatureCount(); i++ )
{
mRubberBand->addGeometry( vlayer->selectedFeatures()[i].geometry(), vlayer );
}
}
mStartPointMapCoords = toMapCoordinates( e->pos() );
mRubberBand->setColor( Qt::red );
mRubberBand->setWidth( 2 );
mRubberBand->show();
}
void QgsMapToolMoveFeature::canvasReleaseEvent( QMouseEvent * e )
{
//QgsDebugMsg("entering.");
if ( !mRubberBand )
{
return;
}
QgsVectorLayer* vlayer = currentVectorLayer();
if ( !vlayer )
{
return;
}
QgsPoint startPointLayerCoords = toLayerCoordinates(( QgsMapLayer* )vlayer, mStartPointMapCoords );
QgsPoint stopPointLayerCoords = toLayerCoordinates(( QgsMapLayer* )vlayer, e->pos() );
double dx = stopPointLayerCoords.x() - startPointLayerCoords.x();
double dy = stopPointLayerCoords.y() - startPointLayerCoords.y();
vlayer->beginEditCommand( tr( "Feature moved" ) );
foreach( QgsFeatureId id, mMovedFeatures )
{
vlayer->translateFeature( id, dx, dy );
}
delete mRubberBand;
mRubberBand = 0;
mCanvas->refresh();
vlayer->endEditCommand();
}
//! called when map tool is being deactivated
void QgsMapToolMoveFeature::deactivate()
{
//delete rubber band
delete mRubberBand;
mRubberBand = 0;
QgsMapTool::deactivate();
}