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qgsmasksymbollayer.cpp
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qgsmasksymbollayer.cpp
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/***************************************************************************
qgsmasksymbollayer.cpp
---------------------
begin : July 2019
copyright : (C) 2019 by Hugo Mercier
email : hugo dot mercier at oslandia 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 "qgsmasksymbollayer.h"
#include "qgssymbollayerutils.h"
#include "qgsproject.h"
#include "qgsvectorlayer.h"
#include "qgspainteffect.h"
#include "qgspainterswapper.h"
#include "qgsmarkersymbol.h"
#include "qgssymbollayerreference.h"
QgsMaskMarkerSymbolLayer::QgsMaskMarkerSymbolLayer()
{
mSymbol.reset( static_cast<QgsMarkerSymbol *>( QgsMarkerSymbol::createSimple( QVariantMap() ) ) );
}
QgsMaskMarkerSymbolLayer::~QgsMaskMarkerSymbolLayer() = default;
bool QgsMaskMarkerSymbolLayer::enabled() const
{
return !mMaskedSymbolLayers.isEmpty();
}
bool QgsMaskMarkerSymbolLayer::setSubSymbol( QgsSymbol *symbol )
{
if ( symbol && symbol->type() == Qgis::SymbolType::Marker )
{
mSymbol.reset( static_cast<QgsMarkerSymbol *>( symbol ) );
return true;
}
delete symbol;
return false;
}
QgsSymbolLayer *QgsMaskMarkerSymbolLayer::create( const QVariantMap &props )
{
QgsMaskMarkerSymbolLayer *l = new QgsMaskMarkerSymbolLayer();
l->setSubSymbol( QgsMarkerSymbol::createSimple( props ) );
if ( props.contains( QStringLiteral( "mask_symbollayers" ) ) )
{
l->setMasks( stringToSymbolLayerReferenceList( props[QStringLiteral( "mask_symbollayers" )].toString() ) );
}
return l;
}
QgsMaskMarkerSymbolLayer *QgsMaskMarkerSymbolLayer::clone() const
{
QgsMaskMarkerSymbolLayer *l = static_cast<QgsMaskMarkerSymbolLayer *>( create( properties() ) );
l->setSubSymbol( mSymbol->clone() );
l->setMasks( mMaskedSymbolLayers );
copyDataDefinedProperties( l );
copyPaintEffect( l );
return l;
}
QgsSymbol *QgsMaskMarkerSymbolLayer::subSymbol()
{
return mSymbol.get();
}
QString QgsMaskMarkerSymbolLayer::layerType() const
{
return QStringLiteral( "MaskMarker" );
}
QVariantMap QgsMaskMarkerSymbolLayer::properties() const
{
QVariantMap props;
props[QStringLiteral( "mask_symbollayers" )] = symbolLayerReferenceListToString( masks() );
return props;
}
QSet<QString> QgsMaskMarkerSymbolLayer::usedAttributes( const QgsRenderContext &context ) const
{
QSet<QString> attributes = QgsMarkerSymbolLayer::usedAttributes( context );
attributes.unite( mSymbol->usedAttributes( context ) );
return attributes;
}
bool QgsMaskMarkerSymbolLayer::hasDataDefinedProperties() const
{
if ( QgsSymbolLayer::hasDataDefinedProperties() )
return true;
if ( mSymbol && mSymbol->hasDataDefinedProperties() )
return true;
return false;
}
void QgsMaskMarkerSymbolLayer::startRender( QgsSymbolRenderContext &context )
{
// since we need to swap the regular painter with the mask painter during rendering,
// effects won't work. So we cheat by handling effects ourselves in renderPoint
if ( auto *lPaintEffect = paintEffect() )
{
mEffect.reset( lPaintEffect->clone() );
setPaintEffect( nullptr );
}
mSymbol->startRender( context.renderContext() );
}
void QgsMaskMarkerSymbolLayer::stopRender( QgsSymbolRenderContext &context )
{
mSymbol->stopRender( context.renderContext() );
if ( mEffect )
{
setPaintEffect( mEffect.release() );
}
}
void QgsMaskMarkerSymbolLayer::drawPreviewIcon( QgsSymbolRenderContext &context, QSize size )
{
QgsMarkerSymbolLayer::drawPreviewIcon( context, size );
}
QList<QgsSymbolLayerReference> QgsMaskMarkerSymbolLayer::masks() const
{
return mMaskedSymbolLayers;
}
void QgsMaskMarkerSymbolLayer::setMasks( const QList<QgsSymbolLayerReference> &maskedLayers )
{
mMaskedSymbolLayers = maskedLayers;
}
QRectF QgsMaskMarkerSymbolLayer::bounds( QPointF point, QgsSymbolRenderContext &context )
{
return mSymbol->bounds( point, context.renderContext() );
}
bool QgsMaskMarkerSymbolLayer::usesMapUnits() const
{
return mSizeUnit == QgsUnitTypes::RenderMapUnits || mSizeUnit == QgsUnitTypes::RenderMetersInMapUnits
|| ( mSymbol && mSymbol->usesMapUnits() );
}
void QgsMaskMarkerSymbolLayer::renderPoint( QPointF point, QgsSymbolRenderContext &context )
{
if ( !context.renderContext().painter() )
return;
if ( context.renderContext().isGuiPreview() )
{
mSymbol->renderPoint( point, context.feature(), context.renderContext(), /* layer = */ -1, /* selected = */ false );
return;
}
if ( ! context.renderContext().maskPainter() )
return;
if ( mMaskedSymbolLayers.isEmpty() )
return;
{
// Otherwise switch to the mask painter before rendering
QgsPainterSwapper swapper( context.renderContext(), context.renderContext().maskPainter() );
// Special case when an effect is defined on this mask symbol layer
// (effects defined on sub symbol's layers do not need special handling)
if ( mEffect && mEffect->enabled() )
{
QgsEffectPainter p( context.renderContext() );
// translate operates on the mask painter, which is what we want
p->translate( point );
p.setEffect( mEffect.get() );
mSymbol->renderPoint( QPointF( 0, 0 ), context.feature(), context.renderContext(), /* layer = */ -1, /* selected = */ false );
// the translation will be canceled at the end of scope here
}
else
{
mSymbol->renderPoint( point, context.feature(), context.renderContext(), /* layer = */ -1, /* selected = */ false );
}
}
}