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qgssinglesymbolrenderer.cpp
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qgssinglesymbolrenderer.cpp
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/***************************************************************************
qgssinglesymbolrenderer.cpp
---------------------
begin : November 2009
copyright : (C) 2009 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 "qgssinglesymbolrenderer.h"
#include "qgssymbol.h"
#include "qgssymbollayerutils.h"
#include "qgsdatadefinedsizelegend.h"
#include "qgslogger.h"
#include "qgsfeature.h"
#include "qgsvectorlayer.h"
#include "qgssymbollayer.h"
#include "qgsogcutils.h"
#include "qgspointdisplacementrenderer.h"
#include "qgsinvertedpolygonrenderer.h"
#include "qgspainteffect.h"
#include "qgspainteffectregistry.h"
#include "qgsproperty.h"
#include <QDomDocument>
#include <QDomElement>
QgsSingleSymbolRenderer::QgsSingleSymbolRenderer( QgsSymbol *symbol )
: QgsFeatureRenderer( QStringLiteral( "singleSymbol" ) )
, mSymbol( symbol )
{
Q_ASSERT( symbol );
}
QgsSymbol *QgsSingleSymbolRenderer::symbolForFeature( const QgsFeature &, QgsRenderContext & ) const
{
return mSymbol.get();
}
QgsSymbol *QgsSingleSymbolRenderer::originalSymbolForFeature( const QgsFeature &feature, QgsRenderContext &context ) const
{
Q_UNUSED( context );
Q_UNUSED( feature );
return mSymbol.get();
}
void QgsSingleSymbolRenderer::startRender( QgsRenderContext &context, const QgsFields &fields )
{
QgsFeatureRenderer::startRender( context, fields );
if ( !mSymbol )
return;
mSymbol->startRender( context, fields );
}
void QgsSingleSymbolRenderer::stopRender( QgsRenderContext &context )
{
QgsFeatureRenderer::stopRender( context );
if ( !mSymbol )
return;
mSymbol->stopRender( context );
}
QSet<QString> QgsSingleSymbolRenderer::usedAttributes( const QgsRenderContext &context ) const
{
QSet<QString> attributes;
if ( mSymbol )
attributes.unite( mSymbol->usedAttributes( context ) );
return attributes;
}
QgsSymbol *QgsSingleSymbolRenderer::symbol() const
{
return mSymbol.get();
}
void QgsSingleSymbolRenderer::setSymbol( QgsSymbol *s )
{
Q_ASSERT( s );
mSymbol.reset( s );
}
QString QgsSingleSymbolRenderer::dump() const
{
return mSymbol ? QStringLiteral( "SINGLE: %1" ).arg( mSymbol->dump() ) : QLatin1String( "" );
}
QgsSingleSymbolRenderer *QgsSingleSymbolRenderer::clone() const
{
QgsSingleSymbolRenderer *r = new QgsSingleSymbolRenderer( mSymbol->clone() );
r->setUsingSymbolLevels( usingSymbolLevels() );
r->setDataDefinedSizeLegend( mDataDefinedSizeLegend ? new QgsDataDefinedSizeLegend( *mDataDefinedSizeLegend ) : nullptr );
copyRendererData( r );
return r;
}
void QgsSingleSymbolRenderer::toSld( QDomDocument &doc, QDomElement &element, const QgsStringMap &props ) const
{
QgsStringMap newProps = props;
QDomElement ruleElem = doc.createElement( QStringLiteral( "se:Rule" ) );
element.appendChild( ruleElem );
QDomElement nameElem = doc.createElement( QStringLiteral( "se:Name" ) );
nameElem.appendChild( doc.createTextNode( QStringLiteral( "Single symbol" ) ) );
ruleElem.appendChild( nameElem );
QgsSymbolLayerUtils::applyScaleDependency( doc, ruleElem, newProps );
if ( mSymbol ) mSymbol->toSld( doc, ruleElem, newProps );
}
QgsSymbolList QgsSingleSymbolRenderer::symbols( QgsRenderContext &context ) const
{
Q_UNUSED( context );
QgsSymbolList lst;
lst.append( mSymbol.get() );
return lst;
}
QgsFeatureRenderer *QgsSingleSymbolRenderer::create( QDomElement &element, const QgsReadWriteContext &context )
{
QDomElement symbolsElem = element.firstChildElement( QStringLiteral( "symbols" ) );
if ( symbolsElem.isNull() )
return nullptr;
QgsSymbolMap symbolMap = QgsSymbolLayerUtils::loadSymbols( symbolsElem, context );
if ( !symbolMap.contains( QStringLiteral( "0" ) ) )
return nullptr;
QgsSingleSymbolRenderer *r = new QgsSingleSymbolRenderer( symbolMap.take( QStringLiteral( "0" ) ) );
// delete symbols if there are any more
QgsSymbolLayerUtils::clearSymbolMap( symbolMap );
QDomElement rotationElem = element.firstChildElement( QStringLiteral( "rotation" ) );
if ( !rotationElem.isNull() && !rotationElem.attribute( QStringLiteral( "field" ) ).isEmpty() )
{
convertSymbolRotation( r->mSymbol.get(), rotationElem.attribute( QStringLiteral( "field" ) ) );
}
QDomElement sizeScaleElem = element.firstChildElement( QStringLiteral( "sizescale" ) );
if ( !sizeScaleElem.isNull() && !sizeScaleElem.attribute( QStringLiteral( "field" ) ).isEmpty() )
{
convertSymbolSizeScale( r->mSymbol.get(),
QgsSymbolLayerUtils::decodeScaleMethod( sizeScaleElem.attribute( QStringLiteral( "scalemethod" ) ) ),
sizeScaleElem.attribute( QStringLiteral( "field" ) ) );
}
QDomElement ddsLegendSizeElem = element.firstChildElement( QStringLiteral( "data-defined-size-legend" ) );
if ( !ddsLegendSizeElem.isNull() )
{
r->mDataDefinedSizeLegend.reset( QgsDataDefinedSizeLegend::readXml( ddsLegendSizeElem, context ) );
}
// TODO: symbol levels
return r;
}
QgsFeatureRenderer *QgsSingleSymbolRenderer::createFromSld( QDomElement &element, QgsWkbTypes::GeometryType geomType )
{
// XXX this renderer can handle only one Rule!
// get the first Rule element
QDomElement ruleElem = element.firstChildElement( QStringLiteral( "Rule" ) );
if ( ruleElem.isNull() )
{
QgsDebugMsg( "no Rule elements found!" );
return nullptr;
}
QString label, description;
QgsSymbolLayerList layers;
// retrieve the Rule element child nodes
QDomElement childElem = ruleElem.firstChildElement();
while ( !childElem.isNull() )
{
if ( childElem.localName() == QLatin1String( "Name" ) )
{
// <se:Name> tag contains the rule identifier,
// so prefer title tag for the label property value
if ( label.isEmpty() )
label = childElem.firstChild().nodeValue();
}
else if ( childElem.localName() == QLatin1String( "Description" ) )
{
// <se:Description> can contains a title and an abstract
QDomElement titleElem = childElem.firstChildElement( QStringLiteral( "Title" ) );
if ( !titleElem.isNull() )
{
label = titleElem.firstChild().nodeValue();
}
QDomElement abstractElem = childElem.firstChildElement( QStringLiteral( "Abstract" ) );
if ( !abstractElem.isNull() )
{
description = abstractElem.firstChild().nodeValue();
}
}
else if ( childElem.localName() == QLatin1String( "Abstract" ) )
{
// <sld:Abstract> (v1.0)
description = childElem.firstChild().nodeValue();
}
else if ( childElem.localName() == QLatin1String( "Title" ) )
{
// <sld:Title> (v1.0)
label = childElem.firstChild().nodeValue();
}
else if ( childElem.localName().endsWith( QLatin1String( "Symbolizer" ) ) )
{
// create symbol layers for this symbolizer
QgsSymbolLayerUtils::createSymbolLayerListFromSld( childElem, geomType, layers );
}
childElem = childElem.nextSiblingElement();
}
if ( layers.isEmpty() )
return nullptr;
// now create the symbol
std::unique_ptr< QgsSymbol > symbol;
switch ( geomType )
{
case QgsWkbTypes::LineGeometry:
symbol = qgis::make_unique< QgsLineSymbol >( layers );
break;
case QgsWkbTypes::PolygonGeometry:
symbol = qgis::make_unique< QgsFillSymbol >( layers );
break;
case QgsWkbTypes::PointGeometry:
symbol = qgis::make_unique< QgsMarkerSymbol >( layers );
break;
default:
QgsDebugMsg( QStringLiteral( "invalid geometry type: found %1" ).arg( geomType ) );
return nullptr;
}
// and finally return the new renderer
return new QgsSingleSymbolRenderer( symbol.release() );
}
QDomElement QgsSingleSymbolRenderer::save( QDomDocument &doc, const QgsReadWriteContext &context )
{
QDomElement rendererElem = doc.createElement( RENDERER_TAG_NAME );
rendererElem.setAttribute( QStringLiteral( "type" ), QStringLiteral( "singleSymbol" ) );
rendererElem.setAttribute( QStringLiteral( "symbollevels" ), ( mUsingSymbolLevels ? QStringLiteral( "1" ) : QStringLiteral( "0" ) ) );
rendererElem.setAttribute( QStringLiteral( "forceraster" ), ( mForceRaster ? QStringLiteral( "1" ) : QStringLiteral( "0" ) ) );
QgsSymbolMap symbols;
symbols[QStringLiteral( "0" )] = mSymbol.get();
QDomElement symbolsElem = QgsSymbolLayerUtils::saveSymbols( symbols, QStringLiteral( "symbols" ), doc, context );
rendererElem.appendChild( symbolsElem );
QDomElement rotationElem = doc.createElement( QStringLiteral( "rotation" ) );
rendererElem.appendChild( rotationElem );
QDomElement sizeScaleElem = doc.createElement( QStringLiteral( "sizescale" ) );
rendererElem.appendChild( sizeScaleElem );
if ( mPaintEffect && !QgsPaintEffectRegistry::isDefaultStack( mPaintEffect ) )
mPaintEffect->saveProperties( doc, rendererElem );
if ( !mOrderBy.isEmpty() )
{
QDomElement orderBy = doc.createElement( QStringLiteral( "orderby" ) );
mOrderBy.save( orderBy );
rendererElem.appendChild( orderBy );
}
rendererElem.setAttribute( QStringLiteral( "enableorderby" ), ( mOrderByEnabled ? QStringLiteral( "1" ) : QStringLiteral( "0" ) ) );
if ( mDataDefinedSizeLegend )
{
QDomElement ddsLegendElem = doc.createElement( QStringLiteral( "data-defined-size-legend" ) );
mDataDefinedSizeLegend->writeXml( ddsLegendElem, context );
rendererElem.appendChild( ddsLegendElem );
}
return rendererElem;
}
QgsLegendSymbolList QgsSingleSymbolRenderer::legendSymbolItems() const
{
if ( mDataDefinedSizeLegend && mSymbol->type() == QgsSymbol::Marker )
{
const QgsMarkerSymbol *symbol = static_cast<const QgsMarkerSymbol *>( mSymbol.get() );
QgsProperty sizeDD( symbol->dataDefinedSize() );
if ( sizeDD && sizeDD.isActive() )
{
QgsDataDefinedSizeLegend ddSizeLegend( *mDataDefinedSizeLegend );
ddSizeLegend.updateFromSymbolAndProperty( static_cast<const QgsMarkerSymbol *>( mSymbol.get() ), sizeDD );
return ddSizeLegend.legendSymbolList();
}
}
QgsLegendSymbolList lst;
lst << QgsLegendSymbolItem( mSymbol.get(), QString(), QString() );
return lst;
}
QSet< QString > QgsSingleSymbolRenderer::legendKeysForFeature( const QgsFeature &feature, QgsRenderContext &context ) const
{
Q_UNUSED( feature );
Q_UNUSED( context );
return QSet< QString >() << QString();
}
void QgsSingleSymbolRenderer::setLegendSymbolItem( const QString &key, QgsSymbol *symbol )
{
Q_UNUSED( key );
setSymbol( symbol );
}
QgsSingleSymbolRenderer *QgsSingleSymbolRenderer::convertFromRenderer( const QgsFeatureRenderer *renderer )
{
QgsSingleSymbolRenderer *r = nullptr;
if ( renderer->type() == QLatin1String( "singleSymbol" ) )
{
r = dynamic_cast<QgsSingleSymbolRenderer *>( renderer->clone() );
}
else if ( renderer->type() == QLatin1String( "pointDisplacement" ) || renderer->type() == QLatin1String( "pointCluster" ) )
{
const QgsPointDistanceRenderer *pointDistanceRenderer = dynamic_cast<const QgsPointDistanceRenderer *>( renderer );
if ( pointDistanceRenderer )
r = convertFromRenderer( pointDistanceRenderer->embeddedRenderer() );
}
else if ( renderer->type() == QLatin1String( "invertedPolygonRenderer" ) )
{
const QgsInvertedPolygonRenderer *invertedPolygonRenderer = dynamic_cast<const QgsInvertedPolygonRenderer *>( renderer );
if ( invertedPolygonRenderer )
r = convertFromRenderer( invertedPolygonRenderer->embeddedRenderer() );
}
if ( !r )
{
QgsRenderContext context;
QgsSymbolList symbols = const_cast<QgsFeatureRenderer *>( renderer )->symbols( context );
if ( !symbols.isEmpty() )
{
r = new QgsSingleSymbolRenderer( symbols.at( 0 )->clone() );
}
}
if ( r )
{
r->setOrderBy( renderer->orderBy() );
r->setOrderByEnabled( renderer->orderByEnabled() );
}
return r;
}
void QgsSingleSymbolRenderer::setDataDefinedSizeLegend( QgsDataDefinedSizeLegend *settings )
{
mDataDefinedSizeLegend.reset( settings );
}
QgsDataDefinedSizeLegend *QgsSingleSymbolRenderer::dataDefinedSizeLegend() const
{
return mDataDefinedSizeLegend.get();
}