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qgsmaptoolselectutils.cpp
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qgsmaptoolselectutils.cpp
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/***************************************************************************
qgsmaptoolselectutils.cpp - Utility methods to help with select map tools
---------------------
begin : May 2010
copyright : (C) 2010 by Jeremy Palmer
email : jpalmer at linz dot govt dot nz
***************************************************************************
* *
* 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. *
* *
***************************************************************************/
/* $Id$ */
#include <limits>
#include "qgsmaptoolselectutils.h"
#include "qgsmapcanvas.h"
#include "qgsvectorlayer.h"
#include "qgsfeature.h"
#include "qgsgeometry.h"
#include "qgsrubberband.h"
#include "qgscsexception.h"
#include "qgslogger.h"
#include "qgis.h"
#include <QMouseEvent>
#include <QApplication>
#include <QMessageBox>
QgsVectorLayer* QgsMapToolSelectUtils::getCurrentVectorLayer( QgsMapCanvas* canvas )
{
QgsVectorLayer* vlayer = NULL;
if ( !canvas->currentLayer()
|| ( vlayer = qobject_cast<QgsVectorLayer *>( canvas->currentLayer() ) ) == NULL )
{
QMessageBox::warning( canvas, QObject::tr( "No active vector layer" ),
QObject::tr( "To select features, you must choose a "
"vector layer by clicking on its name in the legend"
) );
}
return vlayer;
}
void QgsMapToolSelectUtils::setRubberBand( QgsMapCanvas* canvas, QRect& selectRect, QgsRubberBand* rubberBand )
{
const QgsMapToPixel* transform = canvas->getCoordinateTransform();
QgsPoint ll = transform->toMapCoordinates( selectRect.left(), selectRect.bottom() );
QgsPoint ur = transform->toMapCoordinates( selectRect.right(), selectRect.top() );
if ( rubberBand )
{
rubberBand->reset( true );
rubberBand->addPoint( ll, false );
rubberBand->addPoint( QgsPoint( ur.x(), ll.y() ), false );
rubberBand->addPoint( ur, false );
rubberBand->addPoint( QgsPoint( ll.x(), ur.y() ), true );
}
}
void QgsMapToolSelectUtils::expandSelectRectangle( QRect& selectRect,
QgsVectorLayer* vlayer,
QPoint point )
{
int boxSize = 0;
if ( vlayer->geometryType() != QGis::Polygon )
{
//if point or line use an artificial bounding box of 10x10 pixels
//to aid the user to click on a feature accurately
boxSize = 5;
}
else
{
//otherwise just use the click point for polys
boxSize = 1;
}
selectRect.setLeft( point.x() - boxSize );
selectRect.setRight( point.x() + boxSize );
selectRect.setTop( point.y() - boxSize );
selectRect.setBottom( point.y() + boxSize );
}
void QgsMapToolSelectUtils::setSelectFeatures( QgsMapCanvas* canvas,
QgsGeometry* selectGeometry,
bool doContains,
bool doDifference,
bool singleSelect )
{
if ( selectGeometry->type() != QGis::Polygon )
{
return;
}
QgsVectorLayer* vlayer = QgsMapToolSelectUtils::getCurrentVectorLayer( canvas );
if ( vlayer == NULL )
{
return;
}
// toLayerCoordinates will throw an exception for any 'invalid' points in
// the rubber band.
// For example, if you project a world map onto a globe using EPSG 2163
// and then click somewhere off the globe, an exception will be thrown.
QgsGeometry selectGeomTrans( *selectGeometry );
if ( canvas->mapRenderer()->hasCrsTransformEnabled() )
{
try
{
QgsCoordinateTransform ct( canvas->mapRenderer()->destinationCrs(), vlayer->crs() );
selectGeomTrans.transform( ct );
}
catch ( QgsCsException &cse )
{
Q_UNUSED( cse );
// catch exception for 'invalid' point and leave existing selection unchanged
QgsLogger::warning( "Caught CRS exception " + QString( __FILE__ ) + ": " + QString::number( __LINE__ ) );
QMessageBox::warning( canvas, QObject::tr( "CRS Exception" ),
QObject::tr( "Selection extends beyond layer's coordinate system." ) );
return;
}
}
QApplication::setOverrideCursor( Qt::WaitCursor );
QgsDebugMsg( "Selection layer: " + vlayer->name() );
QgsDebugMsg( "Selection polygon: " + selectGeomTrans.exportToWkt() );
QgsDebugMsg( "doContains: " + QString( doContains ? "T" : "F" ) );
QgsDebugMsg( "doDifference: " + QString( doDifference ? "T" : "F" ) );
vlayer->select( QgsAttributeList(), selectGeomTrans.boundingBox(), true, true );
QgsFeatureIds newSelectedFeatures;
QgsFeature f;
int closestFeatureId = 0;
bool foundSingleFeature = false;
double closestFeatureDist = std::numeric_limits<double>::max();
while ( vlayer->nextFeature( f ) )
{
QgsGeometry* g = f.geometry();
if ( doContains )
{
if ( !selectGeomTrans.contains( g ) )
continue;
}
else
{
if ( !selectGeomTrans.intersects( g ) )
continue;
}
if ( singleSelect )
{
foundSingleFeature = true;
double distance = g->distance( selectGeomTrans );
if ( distance <= closestFeatureDist )
{
closestFeatureDist = distance;
closestFeatureId = f.id();
}
}
else
{
newSelectedFeatures.insert( f.id() );
}
}
if ( singleSelect && foundSingleFeature )
{
newSelectedFeatures.insert( closestFeatureId );
}
QgsDebugMsg( "Number of new selected features: " + QString::number( newSelectedFeatures.size() ) );
QgsFeatureIds layerSelectedFeatures;
if ( doDifference )
{
layerSelectedFeatures = vlayer->selectedFeaturesIds();
QgsFeatureIds::const_iterator i = newSelectedFeatures.constEnd();
while ( i != newSelectedFeatures.constBegin() )
{
--i;
if ( layerSelectedFeatures.contains( *i ) )
{
layerSelectedFeatures.remove( *i );
}
else
{
layerSelectedFeatures.insert( *i );
}
}
}
else
{
layerSelectedFeatures = newSelectedFeatures;
}
vlayer->setSelectedFeatures( layerSelectedFeatures );
QApplication::restoreOverrideCursor();
}
void QgsMapToolSelectUtils::setSelectFeatures( QgsMapCanvas* canvas, QgsGeometry* selectGeometry, QMouseEvent * e )
{
bool doContains = e->modifiers() & Qt::ShiftModifier ? true : false;
bool doDifference = e->modifiers() & Qt::ControlModifier ? true : false;
setSelectFeatures( canvas, selectGeometry, doContains, doDifference );
}