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qgsmaphittest.cpp
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qgsmaphittest.cpp
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/***************************************************************************
qgsmaphittest.cpp
---------------------
begin : September 2014
copyright : (C) 2014 by Martin Dobias
email : wonder dot sk at gmail dot com
***************************************************************************
* *
* 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 "qgsmaphittest.h"
#include "qgsfeatureiterator.h"
#include "qgsproject.h"
#include "qgsrendercontext.h"
#include "qgsmaplayerstylemanager.h"
#include "qgsrenderer.h"
#include "qgspointdisplacementrenderer.h"
#include "qgsvectorlayer.h"
#include "qgssymbollayerutils.h"
#include "qgsgeometry.h"
#include "qgsgeometryengine.h"
QgsMapHitTest::QgsMapHitTest( const QgsMapSettings &settings, const QgsGeometry &polygon, const LayerFilterExpression &layerFilterExpression )
: mSettings( settings )
, mLayerFilterExpression( layerFilterExpression )
, mOnlyExpressions( false )
{
if ( !polygon.isNull() && polygon.type() == QgsWkbTypes::PolygonGeometry )
{
mPolygon = polygon;
}
}
QgsMapHitTest::QgsMapHitTest( const QgsMapSettings &settings, const LayerFilterExpression &layerFilterExpression )
: mSettings( settings )
, mLayerFilterExpression( layerFilterExpression )
, mOnlyExpressions( true )
{
}
void QgsMapHitTest::run()
{
// TODO: do we need this temp image?
QImage tmpImage( mSettings.outputSize(), mSettings.outputImageFormat() );
tmpImage.setDotsPerMeterX( mSettings.outputDpi() * 25.4 );
tmpImage.setDotsPerMeterY( mSettings.outputDpi() * 25.4 );
QPainter painter( &tmpImage );
QgsRenderContext context = QgsRenderContext::fromMapSettings( mSettings );
context.setPainter( &painter ); // we are not going to draw anything, but we still need a working painter
Q_FOREACH ( QgsMapLayer *layer, mSettings.layers() )
{
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( layer );
if ( !vl || !vl->renderer() )
continue;
if ( !mOnlyExpressions )
{
if ( !vl->isInScaleRange( mSettings.scale() ) )
{
mHitTest[vl] = SymbolSet(); // no symbols -> will not be shown
mHitTestRuleKey[vl] = SymbolSet();
continue;
}
context.setCoordinateTransform( mSettings.layerTransform( vl ) );
context.setExtent( mSettings.outputExtentToLayerExtent( vl, mSettings.visibleExtent() ) );
}
context.expressionContext() << QgsExpressionContextUtils::layerScope( vl );
SymbolSet &usedSymbols = mHitTest[vl];
SymbolSet &usedSymbolsRuleKey = mHitTestRuleKey[vl];
runHitTestLayer( vl, usedSymbols, usedSymbolsRuleKey, context );
}
painter.end();
}
bool QgsMapHitTest::symbolVisible( QgsSymbol *symbol, QgsVectorLayer *layer ) const
{
if ( !symbol || !layer || !mHitTest.contains( layer ) )
return false;
return mHitTest.value( layer ).contains( QgsSymbolLayerUtils::symbolProperties( symbol ) );
}
bool QgsMapHitTest::legendKeyVisible( const QString &ruleKey, QgsVectorLayer *layer ) const
{
if ( !layer || !mHitTestRuleKey.contains( layer ) )
return false;
return mHitTestRuleKey.value( layer ).contains( ruleKey );
}
void QgsMapHitTest::runHitTestLayer( QgsVectorLayer *vl, SymbolSet &usedSymbols, SymbolSet &usedSymbolsRuleKey, QgsRenderContext &context )
{
QgsMapLayerStyleOverride styleOverride( vl );
if ( mSettings.layerStyleOverrides().contains( vl->id() ) )
styleOverride.setOverrideStyle( mSettings.layerStyleOverrides().value( vl->id() ) );
std::unique_ptr< QgsFeatureRenderer > r( vl->renderer()->clone() );
bool moreSymbolsPerFeature = r->capabilities() & QgsFeatureRenderer::MoreSymbolsPerFeature;
r->startRender( context, vl->fields() );
QgsGeometry transformedPolygon = mPolygon;
if ( !mOnlyExpressions && !mPolygon.isNull() )
{
if ( mSettings.destinationCrs() != vl->crs() )
{
QgsCoordinateTransform ct( mSettings.destinationCrs(), vl->crs(), mSettings.transformContext() );
transformedPolygon.transform( ct );
}
}
QgsFeature f;
QgsFeatureRequest request;
std::unique_ptr< QgsGeometryEngine > polygonEngine;
if ( !mOnlyExpressions )
{
if ( mPolygon.isNull() )
{
request.setFilterRect( context.extent() );
request.setFlags( QgsFeatureRequest::ExactIntersect );
}
else
{
request.setFilterRect( transformedPolygon.boundingBox() );
polygonEngine.reset( QgsGeometry::createGeometryEngine( transformedPolygon.constGet() ) );
polygonEngine->prepareGeometry();
}
}
QgsFeatureIterator fi = vl->getFeatures( request );
SymbolSet lUsedSymbols;
SymbolSet lUsedSymbolsRuleKey;
bool allExpressionFalse = false;
bool hasExpression = mLayerFilterExpression.contains( vl->id() );
std::unique_ptr<QgsExpression> expr;
if ( hasExpression )
{
expr.reset( new QgsExpression( mLayerFilterExpression[vl->id()] ) );
expr->prepare( &context.expressionContext() );
}
while ( fi.nextFeature( f ) )
{
context.expressionContext().setFeature( f );
// filter out elements outside of the polygon
if ( f.hasGeometry() && polygonEngine )
{
if ( !polygonEngine->intersects( f.geometry().constGet() ) )
{
continue;
}
}
// filter out elements where the expression is false
if ( hasExpression )
{
if ( !expr->evaluate( &context.expressionContext() ).toBool() )
continue;
else
allExpressionFalse = false;
}
//make sure we store string representation of symbol, not pointer
//otherwise layer style override changes will delete original symbols and leave hanging pointers
Q_FOREACH ( const QString &legendKey, r->legendKeysForFeature( f, context ) )
{
lUsedSymbolsRuleKey.insert( legendKey );
}
if ( moreSymbolsPerFeature )
{
Q_FOREACH ( QgsSymbol *s, r->originalSymbolsForFeature( f, context ) )
{
if ( s )
lUsedSymbols.insert( QgsSymbolLayerUtils::symbolProperties( s ) );
}
}
else
{
QgsSymbol *s = r->originalSymbolForFeature( f, context );
if ( s )
lUsedSymbols.insert( QgsSymbolLayerUtils::symbolProperties( s ) );
}
}
r->stopRender( context );
if ( !allExpressionFalse )
{
// QSet is implicitly shared => constant time
usedSymbols = lUsedSymbols;
usedSymbolsRuleKey = lUsedSymbolsRuleKey;
}
}