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qgssymbol.cpp
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qgssymbol.cpp
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/***************************************************************************
qgssymbol.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 <QColor>
#include <QImage>
#include <QPainter>
#include <QSize>
#include <QSvgGenerator>
#include <cmath>
#include <map>
#include <random>
#include "qgssymbol.h"
#include "qgssymbollayer.h"
#include "qgslinesymbollayer.h"
#include "qgsmarkersymbollayer.h"
#include "qgsfillsymbollayer.h"
#include "qgsgeometrygeneratorsymbollayer.h"
#include "qgsmaptopixelgeometrysimplifier.h"
#include "qgslogger.h"
#include "qgsrendercontext.h" // for bigSymbolPreview
#include "qgsproject.h"
#include "qgsstyle.h"
#include "qgspainteffect.h"
#include "qgseffectstack.h"
#include "qgsvectorlayer.h"
#include "qgsfeature.h"
#include "qgsgeometry.h"
#include "qgsmultipoint.h"
#include "qgsgeometrycollection.h"
#include "qgslinestring.h"
#include "qgspolygon.h"
#include "qgsclipper.h"
#include "qgsproperty.h"
#include "qgscolorschemeregistry.h"
#include "qgsapplication.h"
#include "qgsexpressioncontextutils.h"
#include "qgsrenderedfeaturehandlerinterface.h"
#include "qgslegendpatchshape.h"
inline
QgsProperty rotateWholeSymbol( double additionalRotation, const QgsProperty &property )
{
QString exprString = property.asExpression();
return QgsProperty::fromExpression( QString::number( additionalRotation ) + " + (" + exprString + ')' );
}
inline
QgsProperty scaleWholeSymbol( double scaleFactor, const QgsProperty &property )
{
QString exprString = property.asExpression();
return QgsProperty::fromExpression( QString::number( scaleFactor ) + "*(" + exprString + ')' );
}
inline
QgsProperty scaleWholeSymbol( double scaleFactorX, double scaleFactorY, const QgsProperty &property )
{
QString exprString = property.asExpression();
return QgsProperty::fromExpression(
( !qgsDoubleNear( scaleFactorX, 0.0 ) ? "tostring(" + QString::number( scaleFactorX ) + "*(" + exprString + "))" : QStringLiteral( "'0'" ) ) +
"|| ',' || " +
( !qgsDoubleNear( scaleFactorY, 0.0 ) ? "tostring(" + QString::number( scaleFactorY ) + "*(" + exprString + "))" : QStringLiteral( "'0'" ) ) );
}
////////////////////
Q_NOWARN_DEPRECATED_PUSH // because of deprecated mLayer
QgsSymbol::QgsSymbol( SymbolType type, const QgsSymbolLayerList &layers )
: mType( type )
, mLayers( layers )
{
// check they're all correct symbol layers
for ( int i = 0; i < mLayers.count(); i++ )
{
if ( !mLayers.at( i ) )
{
mLayers.removeAt( i-- );
}
else if ( !mLayers.at( i )->isCompatibleWithSymbol( this ) )
{
delete mLayers.at( i );
mLayers.removeAt( i-- );
}
}
}
Q_NOWARN_DEPRECATED_POP
QPolygonF QgsSymbol::_getLineString( QgsRenderContext &context, const QgsCurve &curve, bool clipToExtent )
{
const unsigned int nPoints = curve.numPoints();
QgsCoordinateTransform ct = context.coordinateTransform();
const QgsMapToPixel &mtp = context.mapToPixel();
QPolygonF pts;
//apply clipping for large lines to achieve a better rendering performance
if ( clipToExtent && nPoints > 1 )
{
const QgsRectangle &e = context.extent();
const double cw = e.width() / 10;
const double ch = e.height() / 10;
const QgsRectangle clipRect( e.xMinimum() - cw, e.yMinimum() - ch, e.xMaximum() + cw, e.yMaximum() + ch );
pts = QgsClipper::clippedLine( curve, clipRect );
}
else
{
pts = curve.asQPolygonF();
}
//transform the QPolygonF to screen coordinates
if ( ct.isValid() )
{
try
{
ct.transformPolygon( pts );
}
catch ( QgsCsException & )
{
// we don't abort the rendering here, instead we remove any invalid points and just plot those which ARE valid
}
}
// remove non-finite points, e.g. infinite or NaN points caused by reprojecting errors
pts.erase( std::remove_if( pts.begin(), pts.end(),
[]( const QPointF point )
{
return !std::isfinite( point.x() ) || !std::isfinite( point.y() );
} ), pts.end() );
QPointF *ptr = pts.data();
for ( int i = 0; i < pts.size(); ++i, ++ptr )
{
mtp.transformInPlace( ptr->rx(), ptr->ry() );
}
return pts;
}
QPolygonF QgsSymbol::_getPolygonRing( QgsRenderContext &context, const QgsCurve &curve, const bool clipToExtent, const bool isExteriorRing, const bool correctRingOrientation )
{
const QgsCoordinateTransform ct = context.coordinateTransform();
const QgsMapToPixel &mtp = context.mapToPixel();
const QgsRectangle &e = context.extent();
const double cw = e.width() / 10;
const double ch = e.height() / 10;
QgsRectangle clipRect( e.xMinimum() - cw, e.yMinimum() - ch, e.xMaximum() + cw, e.yMaximum() + ch );
QPolygonF poly = curve.asQPolygonF();
if ( curve.numPoints() < 1 )
return QPolygonF();
if ( correctRingOrientation )
{
// ensure consistent polygon ring orientation
if ( isExteriorRing && curve.orientation() != QgsCurve::Clockwise )
std::reverse( poly.begin(), poly.end() );
else if ( !isExteriorRing && curve.orientation() != QgsCurve::CounterClockwise )
std::reverse( poly.begin(), poly.end() );
}
//clip close to view extent, if needed
const QRectF ptsRect = poly.boundingRect();
if ( clipToExtent && !context.extent().contains( ptsRect ) )
{
QgsClipper::trimPolygon( poly, clipRect );
}
//transform the QPolygonF to screen coordinates
if ( ct.isValid() )
{
try
{
ct.transformPolygon( poly );
}
catch ( QgsCsException & )
{
// we don't abort the rendering here, instead we remove any invalid points and just plot those which ARE valid
}
}
// remove non-finite points, e.g. infinite or NaN points caused by reprojecting errors
poly.erase( std::remove_if( poly.begin(), poly.end(),
[]( const QPointF point )
{
return !std::isfinite( point.x() ) || !std::isfinite( point.y() );
} ), poly.end() );
QPointF *ptr = poly.data();
for ( int i = 0; i < poly.size(); ++i, ++ptr )
{
mtp.transformInPlace( ptr->rx(), ptr->ry() );
}
if ( !poly.empty() && !poly.isClosed() )
poly << poly.at( 0 );
return poly;
}
void QgsSymbol::_getPolygon( QPolygonF &pts, QVector<QPolygonF> &holes, QgsRenderContext &context, const QgsPolygon &polygon, const bool clipToExtent, const bool correctRingOrientation )
{
holes.clear();
pts = _getPolygonRing( context, *polygon.exteriorRing(), clipToExtent, true, correctRingOrientation );
const int ringCount = polygon.numInteriorRings();
holes.reserve( ringCount );
for ( int idx = 0; idx < ringCount; idx++ )
{
const QPolygonF hole = _getPolygonRing( context, *( polygon.interiorRing( idx ) ), clipToExtent, false, correctRingOrientation );
if ( !hole.isEmpty() )
holes.append( hole );
}
}
QgsSymbol::~QgsSymbol()
{
// delete all symbol layers (we own them, so it's okay)
qDeleteAll( mLayers );
}
QgsUnitTypes::RenderUnit QgsSymbol::outputUnit() const
{
if ( mLayers.empty() )
{
return QgsUnitTypes::RenderUnknownUnit;
}
QgsSymbolLayerList::const_iterator it = mLayers.constBegin();
QgsUnitTypes::RenderUnit unit = ( *it )->outputUnit();
for ( ; it != mLayers.constEnd(); ++it )
{
if ( ( *it )->outputUnit() != unit )
{
return QgsUnitTypes::RenderUnknownUnit;
}
}
return unit;
}
QgsMapUnitScale QgsSymbol::mapUnitScale() const
{
if ( mLayers.empty() )
{
return QgsMapUnitScale();
}
QgsSymbolLayerList::const_iterator it = mLayers.constBegin();
if ( it == mLayers.constEnd() )
return QgsMapUnitScale();
QgsMapUnitScale scale = ( *it )->mapUnitScale();
++it;
for ( ; it != mLayers.constEnd(); ++it )
{
if ( ( *it )->mapUnitScale() != scale )
{
return QgsMapUnitScale();
}
}
return scale;
}
void QgsSymbol::setOutputUnit( QgsUnitTypes::RenderUnit u )
{
const auto constMLayers = mLayers;
for ( QgsSymbolLayer *layer : constMLayers )
{
layer->setOutputUnit( u );
}
}
void QgsSymbol::setMapUnitScale( const QgsMapUnitScale &scale )
{
const auto constMLayers = mLayers;
for ( QgsSymbolLayer *layer : constMLayers )
{
layer->setMapUnitScale( scale );
}
}
QgsSymbol *QgsSymbol::defaultSymbol( QgsWkbTypes::GeometryType geomType )
{
std::unique_ptr< QgsSymbol > s;
// override global default if project has a default for this type
QString defaultSymbol;
switch ( geomType )
{
case QgsWkbTypes::PointGeometry :
defaultSymbol = QgsProject::instance()->readEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/Marker" ) );
break;
case QgsWkbTypes::LineGeometry :
defaultSymbol = QgsProject::instance()->readEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/Line" ) );
break;
case QgsWkbTypes::PolygonGeometry :
defaultSymbol = QgsProject::instance()->readEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/Fill" ) );
break;
default:
break;
}
if ( !defaultSymbol.isEmpty() )
s.reset( QgsStyle::defaultStyle()->symbol( defaultSymbol ) );
// if no default found for this type, get global default (as previously)
if ( !s )
{
switch ( geomType )
{
case QgsWkbTypes::PointGeometry:
s = qgis::make_unique< QgsMarkerSymbol >();
break;
case QgsWkbTypes::LineGeometry:
s = qgis::make_unique< QgsLineSymbol >();
break;
case QgsWkbTypes::PolygonGeometry:
s = qgis::make_unique< QgsFillSymbol >();
break;
default:
QgsDebugMsg( QStringLiteral( "unknown layer's geometry type" ) );
return nullptr;
}
}
// set opacity
double opacity = 1.0;
bool ok = false;
// upgrade old setting
double alpha = QgsProject::instance()->readDoubleEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/AlphaInt" ), 255, &ok );
if ( ok )
opacity = alpha / 255.0;
double newOpacity = QgsProject::instance()->readDoubleEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/Opacity" ), 1.0, &ok );
if ( ok )
opacity = newOpacity;
s->setOpacity( opacity );
// set random color, it project prefs allow
if ( defaultSymbol.isEmpty() ||
QgsProject::instance()->readBoolEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/RandomColors" ), true ) )
{
s->setColor( QgsApplication::colorSchemeRegistry()->fetchRandomStyleColor() );
}
return s.release();
}
QgsSymbolLayer *QgsSymbol::symbolLayer( int layer )
{
return mLayers.value( layer );
}
const QgsSymbolLayer *QgsSymbol::symbolLayer( int layer ) const
{
return mLayers.value( layer );
}
bool QgsSymbol::insertSymbolLayer( int index, QgsSymbolLayer *layer )
{
if ( index < 0 || index > mLayers.count() ) // can be added also after the last index
return false;
if ( !layer || !layer->isCompatibleWithSymbol( this ) )
return false;
mLayers.insert( index, layer );
return true;
}
bool QgsSymbol::appendSymbolLayer( QgsSymbolLayer *layer )
{
if ( !layer || !layer->isCompatibleWithSymbol( this ) )
return false;
mLayers.append( layer );
return true;
}
bool QgsSymbol::deleteSymbolLayer( int index )
{
if ( index < 0 || index >= mLayers.count() )
return false;
delete mLayers.at( index );
mLayers.removeAt( index );
return true;
}
QgsSymbolLayer *QgsSymbol::takeSymbolLayer( int index )
{
if ( index < 0 || index >= mLayers.count() )
return nullptr;
return mLayers.takeAt( index );
}
bool QgsSymbol::changeSymbolLayer( int index, QgsSymbolLayer *layer )
{
QgsSymbolLayer *oldLayer = mLayers.value( index );
if ( oldLayer == layer )
return false;
if ( !layer || !layer->isCompatibleWithSymbol( this ) )
return false;
delete oldLayer; // first delete the original layer
mLayers[index] = layer; // set new layer
return true;
}
void QgsSymbol::startRender( QgsRenderContext &context, const QgsFields &fields )
{
Q_ASSERT_X( !mStarted, "startRender", "Rendering has already been started for this symbol instance!" );
mStarted = true;
mSymbolRenderContext.reset( new QgsSymbolRenderContext( context, QgsUnitTypes::RenderUnknownUnit, mOpacity, false, mRenderHints, nullptr, fields ) );
// Why do we need a copy here ? Is it to make sure the symbol layer rendering does not mess with the symbol render context ?
// Or is there another profound reason ?
QgsSymbolRenderContext symbolContext( context, QgsUnitTypes::RenderUnknownUnit, mOpacity, false, mRenderHints, nullptr, fields );
std::unique_ptr< QgsExpressionContextScope > scope( QgsExpressionContextUtils::updateSymbolScope( this, new QgsExpressionContextScope() ) );
mSymbolRenderContext->setExpressionContextScope( scope.release() );
const auto constMLayers = mLayers;
for ( QgsSymbolLayer *layer : constMLayers )
{
if ( !layer->enabled() || !context.isSymbolLayerEnabled( layer ) )
continue;
layer->prepareExpressions( symbolContext );
layer->startRender( symbolContext );
}
}
void QgsSymbol::stopRender( QgsRenderContext &context )
{
Q_ASSERT_X( mStarted, "startRender", "startRender was not called for this symbol instance!" );
mStarted = false;
Q_UNUSED( context )
if ( mSymbolRenderContext )
{
const auto constMLayers = mLayers;
for ( QgsSymbolLayer *layer : constMLayers )
{
if ( !layer->enabled() || !context.isSymbolLayerEnabled( layer ) )
continue;
layer->stopRender( *mSymbolRenderContext );
}
}
mSymbolRenderContext.reset( nullptr );
Q_NOWARN_DEPRECATED_PUSH
mLayer = nullptr;
Q_NOWARN_DEPRECATED_POP
}
void QgsSymbol::setColor( const QColor &color )
{
const auto constMLayers = mLayers;
for ( QgsSymbolLayer *layer : constMLayers )
{
if ( !layer->isLocked() )
layer->setColor( color );
}
}
QColor QgsSymbol::color() const
{
for ( QgsSymbolLayerList::const_iterator it = mLayers.begin(); it != mLayers.end(); ++it )
{
// return color of the first unlocked layer
if ( !( *it )->isLocked() )
return ( *it )->color();
}
return QColor( 0, 0, 0 );
}
void QgsSymbol::drawPreviewIcon( QPainter *painter, QSize size, QgsRenderContext *customContext, bool selected, const QgsExpressionContext *expressionContext, const QgsLegendPatchShape *patchShape )
{
QgsRenderContext *context = customContext;
std::unique_ptr< QgsRenderContext > tempContext;
if ( !context )
{
tempContext.reset( new QgsRenderContext( QgsRenderContext::fromQPainter( painter ) ) );
context = tempContext.get();
context->setFlag( QgsRenderContext::RenderSymbolPreview, true );
}
const bool prevForceVector = context->forceVectorOutput();
context->setForceVectorOutput( true );
QgsSymbolRenderContext symbolContext( *context, QgsUnitTypes::RenderUnknownUnit, mOpacity, false, mRenderHints, nullptr );
symbolContext.setSelected( selected );
symbolContext.setOriginalGeometryType( mType == Fill ? QgsWkbTypes::PolygonGeometry : QgsWkbTypes::UnknownGeometry );
if ( patchShape )
symbolContext.setPatchShape( *patchShape );
if ( !customContext && expressionContext )
{
context->setExpressionContext( *expressionContext );
}
else if ( !customContext )
{
// if no render context was passed, build a minimal expression context
QgsExpressionContext expContext;
expContext.appendScopes( QgsExpressionContextUtils::globalProjectLayerScopes( nullptr ) );
context->setExpressionContext( expContext );
}
for ( QgsSymbolLayer *layer : qgis::as_const( mLayers ) )
{
if ( !layer->enabled() || ( customContext && !customContext->isSymbolLayerEnabled( layer ) ) )
continue;
if ( mType == Fill && layer->type() == Line )
{
// line symbol layer would normally draw just a line
// so we override this case to force it to draw a polygon stroke
QgsLineSymbolLayer *lsl = dynamic_cast<QgsLineSymbolLayer *>( layer );
if ( lsl )
{
// from QgsFillSymbolLayer::drawPreviewIcon() -- would be nicer to add the
// symbol type to QgsSymbolLayer::drawPreviewIcon so this logic could be avoided!
// hmm... why was this using size -1 ??
const QSizeF targetSize = QSizeF( size.width() - 1, size.height() - 1 );
const QList< QList< QPolygonF > > polys = patchShape ? patchShape->toQPolygonF( QgsSymbol::Fill, targetSize )
: QgsStyle::defaultStyle()->defaultPatchAsQPolygonF( QgsSymbol::Fill, targetSize );
lsl->startRender( symbolContext );
QgsPaintEffect *effect = lsl->paintEffect();
std::unique_ptr< QgsEffectPainter > effectPainter;
if ( effect && effect->enabled() )
effectPainter = qgis::make_unique< QgsEffectPainter >( symbolContext.renderContext(), effect );
for ( const QList< QPolygonF > &poly : polys )
{
QVector< QPolygonF > rings;
for ( int i = 1; i < poly.size(); ++i )
rings << poly.at( i );
lsl->renderPolygonStroke( poly.value( 0 ), &rings, symbolContext );
}
effectPainter.reset();
lsl->stopRender( symbolContext );
}
}
else
layer->drawPreviewIcon( symbolContext, size );
}
context->setForceVectorOutput( prevForceVector );
}
void QgsSymbol::exportImage( const QString &path, const QString &format, QSize size )
{
if ( format.compare( QLatin1String( "svg" ), Qt::CaseInsensitive ) == 0 )
{
QSvgGenerator generator;
generator.setFileName( path );
generator.setSize( size );
generator.setViewBox( QRect( 0, 0, size.height(), size.height() ) );
QPainter painter( &generator );
drawPreviewIcon( &painter, size );
painter.end();
}
else
{
QImage image = asImage( size );
image.save( path );
}
}
QImage QgsSymbol::asImage( QSize size, QgsRenderContext *customContext )
{
QImage image( size, QImage::Format_ARGB32_Premultiplied );
image.fill( 0 );
QPainter p( &image );
p.setRenderHint( QPainter::Antialiasing );
drawPreviewIcon( &p, size, customContext );
return image;
}
QImage QgsSymbol::bigSymbolPreviewImage( QgsExpressionContext *expressionContext )
{
QImage preview( QSize( 100, 100 ), QImage::Format_ARGB32_Premultiplied );
preview.fill( 0 );
QPainter p( &preview );
p.setRenderHint( QPainter::Antialiasing );
p.translate( 0.5, 0.5 ); // shift by half a pixel to avoid blurring due antialiasing
if ( mType == QgsSymbol::Marker )
{
p.setPen( QPen( Qt::gray ) );
p.drawLine( 0, 50, 100, 50 );
p.drawLine( 50, 0, 50, 100 );
}
QgsRenderContext context = QgsRenderContext::fromQPainter( &p );
context.setFlag( QgsRenderContext::RenderSymbolPreview );
if ( expressionContext )
context.setExpressionContext( *expressionContext );
context.setIsGuiPreview( true );
startRender( context );
if ( mType == QgsSymbol::Line )
{
QPolygonF poly;
poly << QPointF( 0, 50 ) << QPointF( 99, 50 );
static_cast<QgsLineSymbol *>( this )->renderPolyline( poly, nullptr, context );
}
else if ( mType == QgsSymbol::Fill )
{
QPolygonF polygon;
polygon << QPointF( 20, 20 ) << QPointF( 80, 20 ) << QPointF( 80, 80 ) << QPointF( 20, 80 ) << QPointF( 20, 20 );
static_cast<QgsFillSymbol *>( this )->renderPolygon( polygon, nullptr, nullptr, context );
}
else // marker
{
static_cast<QgsMarkerSymbol *>( this )->renderPoint( QPointF( 50, 50 ), nullptr, context );
}
stopRender( context );
return preview;
}
QString QgsSymbol::dump() const
{
QString t;
switch ( type() )
{
case QgsSymbol::Marker:
t = QStringLiteral( "MARKER" );
break;
case QgsSymbol::Line:
t = QStringLiteral( "LINE" );
break;
case QgsSymbol::Fill:
t = QStringLiteral( "FILL" );
break;
default:
Q_ASSERT( false && "unknown symbol type" );
}
QString s = QStringLiteral( "%1 SYMBOL (%2 layers) color %3" ).arg( t ).arg( mLayers.count() ).arg( QgsSymbolLayerUtils::encodeColor( color() ) );
for ( QgsSymbolLayerList::const_iterator it = mLayers.begin(); it != mLayers.end(); ++it )
{
// TODO:
}
return s;
}
void QgsSymbol::toSld( QDomDocument &doc, QDomElement &element, QgsStringMap props ) const
{
props[ QStringLiteral( "alpha" )] = QString::number( opacity() );
double scaleFactor = 1.0;
props[ QStringLiteral( "uom" )] = QgsSymbolLayerUtils::encodeSldUom( outputUnit(), &scaleFactor );
props[ QStringLiteral( "uomScale" )] = ( !qgsDoubleNear( scaleFactor, 1.0 ) ? qgsDoubleToString( scaleFactor ) : QString() );
for ( QgsSymbolLayerList::const_iterator it = mLayers.begin(); it != mLayers.end(); ++it )
{
( *it )->toSld( doc, element, props );
}
}
QgsSymbolLayerList QgsSymbol::cloneLayers() const
{
QgsSymbolLayerList lst;
for ( QgsSymbolLayerList::const_iterator it = mLayers.begin(); it != mLayers.end(); ++it )
{
QgsSymbolLayer *layer = ( *it )->clone();
layer->setLocked( ( *it )->isLocked() );
layer->setRenderingPass( ( *it )->renderingPass() );
layer->setEnabled( ( *it )->enabled() );
lst.append( layer );
}
return lst;
}
void QgsSymbol::renderUsingLayer( QgsSymbolLayer *layer, QgsSymbolRenderContext &context )
{
Q_ASSERT( layer->type() == Hybrid );
if ( layer->dataDefinedProperties().hasActiveProperties() && !layer->dataDefinedProperties().valueAsBool( QgsSymbolLayer::PropertyLayerEnabled, context.renderContext().expressionContext(), true ) )
return;
QgsGeometryGeneratorSymbolLayer *generatorLayer = static_cast<QgsGeometryGeneratorSymbolLayer *>( layer );
QgsPaintEffect *effect = generatorLayer->paintEffect();
if ( effect && effect->enabled() )
{
QgsEffectPainter p( context.renderContext(), effect );
generatorLayer->render( context );
}
else
{
generatorLayer->render( context );
}
}
QSet<QString> QgsSymbol::usedAttributes( const QgsRenderContext &context ) const
{
QSet<QString> attributes;
QgsSymbolLayerList::const_iterator sIt = mLayers.constBegin();
for ( ; sIt != mLayers.constEnd(); ++sIt )
{
if ( *sIt )
{
attributes.unite( ( *sIt )->usedAttributes( context ) );
}
}
return attributes;
}
bool QgsSymbol::hasDataDefinedProperties() const
{
const auto constMLayers = mLayers;
for ( QgsSymbolLayer *layer : constMLayers )
{
if ( layer->hasDataDefinedProperties() )
return true;
}
return false;
}
void QgsSymbol::setLayer( const QgsVectorLayer *layer )
{
Q_NOWARN_DEPRECATED_PUSH
mLayer = layer;
Q_NOWARN_DEPRECATED_POP
}
const QgsVectorLayer *QgsSymbol::layer() const
{
Q_NOWARN_DEPRECATED_PUSH
return mLayer;
Q_NOWARN_DEPRECATED_POP
}
///@cond PRIVATE
/**
* RAII class to pop scope from an expression context on destruction
*/
class ExpressionContextScopePopper
{
public:
ExpressionContextScopePopper() = default;
~ExpressionContextScopePopper()
{
if ( context )
context->popScope();
}
QgsExpressionContext *context = nullptr;
};
/**
* RAII class to restore original geometry on a render context on destruction
*/
class GeometryRestorer
{
public:
GeometryRestorer( QgsRenderContext &context )
: mContext( context ),
mGeometry( context.geometry() )
{}
~GeometryRestorer()
{
mContext.setGeometry( mGeometry );
}
private:
QgsRenderContext &mContext;
const QgsAbstractGeometry *mGeometry;
};
///@endcond PRIVATE
void QgsSymbol::renderFeature( const QgsFeature &feature, QgsRenderContext &context, int layer, bool selected, bool drawVertexMarker, int currentVertexMarkerType, double currentVertexMarkerSize )
{
if ( context.renderingStopped() )
return;
const QgsGeometry geom = feature.geometry();
if ( geom.isNull() )
{
return;
}
GeometryRestorer geomRestorer( context );
QgsGeometry segmentizedGeometry = geom;
bool usingSegmentizedGeometry = false;
context.setGeometry( geom.constGet() );
bool tileMapRendering = context.testFlag( QgsRenderContext::RenderMapTile );
//convert curve types to normal point/line/polygon ones
bool needsSegmentizing = QgsWkbTypes::isCurvedType( geom.constGet()->wkbType() ) || geom.constGet()->hasCurvedSegments();
if ( !needsSegmentizing )
{
if ( const QgsGeometryCollection *collection = qgsgeometry_cast< const QgsGeometryCollection * >( geom.constGet() ) )
{
for ( int i = 0; i < collection->numGeometries(); ++i )
{
if ( QgsWkbTypes::isCurvedType( collection->geometryN( i )->wkbType() ) )
{
needsSegmentizing = true;
break;
}
}
}
}
if ( needsSegmentizing )
{
QgsAbstractGeometry *g = geom.constGet()->segmentize( context.segmentationTolerance(), context.segmentationToleranceType() );
if ( !g )
{
return;
}
segmentizedGeometry = QgsGeometry( g );
usingSegmentizedGeometry = true;
}
mSymbolRenderContext->setGeometryPartCount( segmentizedGeometry.constGet()->partCount() );
mSymbolRenderContext->setGeometryPartNum( 1 );
const bool needsExpressionContext = hasDataDefinedProperties();
ExpressionContextScopePopper scopePopper;
if ( mSymbolRenderContext->expressionContextScope() )
{
if ( needsExpressionContext )
{
// this is somewhat nasty - by appending this scope here it's now owned
// by both mSymbolRenderContext AND context.expressionContext()
// the RAII scopePopper is required to make sure it always has ownership transferred back
// from context.expressionContext(), even if exceptions of other early exits occur in this
// function
context.expressionContext().appendScope( mSymbolRenderContext->expressionContextScope() );
scopePopper.context = &context.expressionContext();
QgsExpressionContextUtils::updateSymbolScope( this, mSymbolRenderContext->expressionContextScope() );
mSymbolRenderContext->expressionContextScope()->addVariable( QgsExpressionContextScope::StaticVariable( QgsExpressionContext::EXPR_GEOMETRY_PART_COUNT, mSymbolRenderContext->geometryPartCount(), true ) );
mSymbolRenderContext->expressionContextScope()->addVariable( QgsExpressionContextScope::StaticVariable( QgsExpressionContext::EXPR_GEOMETRY_PART_NUM, 1, true ) );
}
}
// Collection of markers to paint, only used for no curve types.
QPolygonF markers;
// Simplify the geometry, if needed.
if ( context.vectorSimplifyMethod().forceLocalOptimization() )
{
const int simplifyHints = context.vectorSimplifyMethod().simplifyHints();
const QgsMapToPixelSimplifier simplifier( simplifyHints, context.vectorSimplifyMethod().tolerance(),
static_cast< QgsMapToPixelSimplifier::SimplifyAlgorithm >( context.vectorSimplifyMethod().simplifyAlgorithm() ) );
segmentizedGeometry = simplifier.simplify( segmentizedGeometry );
}
if ( !context.featureClipGeometry().isEmpty() )
{
// apply feature clipping from context to the rendered geometry only -- just like the render time simplification,
// we should NEVER apply this to the geometry attached to the feature itself. Doing so causes issues with certain
// renderer settings, e.g. if polygons are being rendered using a rule based renderer based on the feature's area,
// then we need to ensure that the original feature area is used instead of the clipped area..
segmentizedGeometry = segmentizedGeometry.intersection( context.featureClipGeometry() );
}
QgsGeometry renderedBoundsGeom;
// Step 1 - collect the set of painter coordinate geometries to render.
// We do this upfront, because we only want to ever do this once, regardless how many symbol layers we need to render.
struct PointInfo
{
QPointF renderPoint;
const QgsPoint *originalGeometry = nullptr;
};
QVector< PointInfo > pointsToRender;
struct LineInfo
{
QPolygonF renderLine;
const QgsCurve *originalGeometry = nullptr;
};
QVector< LineInfo > linesToRender;
struct PolygonInfo
{
QPolygonF renderExterior;
QVector< QPolygonF > renderRings;
const QgsPolygon *originalGeometry = nullptr;
};
QVector< PolygonInfo > polygonsToRender;
std::function< void ( const QgsAbstractGeometry * )> getPartGeometry;
getPartGeometry = [&pointsToRender, &linesToRender, &polygonsToRender, &getPartGeometry, &context, &tileMapRendering, &markers, &feature, this]( const QgsAbstractGeometry * part )
{
Q_UNUSED( feature )
if ( !part )
return;
switch ( QgsWkbTypes::flatType( part->wkbType() ) )
{
case QgsWkbTypes::Point:
{
if ( mType != QgsSymbol::Marker )
{
QgsDebugMsgLevel( QStringLiteral( "point can be drawn only with marker symbol!" ), 2 );
break;
}
PointInfo info;
info.originalGeometry = qgsgeometry_cast< const QgsPoint * >( part );
info.renderPoint = _getPoint( context, *info.originalGeometry );
pointsToRender << info;
break;
}
case QgsWkbTypes::LineString:
{
if ( mType != QgsSymbol::Line )
{
QgsDebugMsgLevel( QStringLiteral( "linestring can be drawn only with line symbol!" ), 2 );
break;
}
LineInfo info;
info.originalGeometry = qgsgeometry_cast<const QgsCurve *>( part );
info.renderLine = _getLineString( context, *info.originalGeometry, !tileMapRendering && clipFeaturesToExtent() );
linesToRender << info;
break;
}
case QgsWkbTypes::Polygon:
case QgsWkbTypes::Triangle:
{
QPolygonF pts;
QVector<QPolygonF> holes;
if ( mType != QgsSymbol::Fill )
{
QgsDebugMsgLevel( QStringLiteral( "polygon can be drawn only with fill symbol!" ), 2 );
break;
}
PolygonInfo info;
info.originalGeometry = qgsgeometry_cast<const QgsPolygon *>( part );
if ( !info.originalGeometry->exteriorRing() )
{
QgsDebugMsg( QStringLiteral( "cannot render polygon with no exterior ring" ) );
break;
}
_getPolygon( info.renderExterior, info.renderRings, context, *info.originalGeometry, !tileMapRendering && clipFeaturesToExtent(), mForceRHR );
polygonsToRender << info;
break;
}
case QgsWkbTypes::MultiPoint:
{