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qgsgeometrygeneratorsymbollayer.cpp
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qgsgeometrygeneratorsymbollayer.cpp
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/***************************************************************************
qgsgeometrygeneratorsymbollayer.cpp
---------------------
begin : November 2015
copyright : (C) 2015 by Matthias Kuhn
email : matthias at opengis dot ch
***************************************************************************
* *
* 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 "qgsgeometrygeneratorsymbollayer.h"
#include "qgsgeometry.h"
#include "qgsmarkersymbol.h"
#include "qgslinesymbol.h"
#include "qgsfillsymbol.h"
#include "qgspolygon.h"
#include "qgslegendpatchshape.h"
#include "qgsstyle.h"
#include "qgsexpressioncontextutils.h"
QgsGeometryGeneratorSymbolLayer::~QgsGeometryGeneratorSymbolLayer() = default;
QgsSymbolLayer *QgsGeometryGeneratorSymbolLayer::create( const QVariantMap &properties )
{
QString expression = properties.value( QStringLiteral( "geometryModifier" ) ).toString();
if ( expression.isEmpty() )
{
expression = QStringLiteral( "$geometry" );
}
QgsGeometryGeneratorSymbolLayer *symbolLayer = new QgsGeometryGeneratorSymbolLayer( expression );
if ( properties.value( QStringLiteral( "SymbolType" ) ) == QLatin1String( "Marker" ) )
{
symbolLayer->setSubSymbol( QgsMarkerSymbol::createSimple( properties ) );
}
else if ( properties.value( QStringLiteral( "SymbolType" ) ) == QLatin1String( "Line" ) )
{
symbolLayer->setSubSymbol( QgsLineSymbol::createSimple( properties ) );
}
else
{
symbolLayer->setSubSymbol( QgsFillSymbol::createSimple( properties ) );
}
symbolLayer->setUnits( QgsUnitTypes::decodeRenderUnit( properties.value( QStringLiteral( "units" ), QStringLiteral( "mapunits" ) ).toString() ) );
symbolLayer->restoreOldDataDefinedProperties( properties );
return symbolLayer;
}
QgsGeometryGeneratorSymbolLayer::QgsGeometryGeneratorSymbolLayer( const QString &expression )
: QgsSymbolLayer( Qgis::SymbolType::Hybrid )
, mExpression( new QgsExpression( expression ) )
, mSymbolType( Qgis::SymbolType::Marker )
{
}
QString QgsGeometryGeneratorSymbolLayer::layerType() const
{
return QStringLiteral( "GeometryGenerator" );
}
void QgsGeometryGeneratorSymbolLayer::setSymbolType( Qgis::SymbolType symbolType )
{
if ( symbolType == Qgis::SymbolType::Fill )
{
if ( !mFillSymbol )
mFillSymbol.reset( QgsFillSymbol::createSimple( QVariantMap() ) );
mSymbol = mFillSymbol.get();
}
else if ( symbolType == Qgis::SymbolType::Line )
{
if ( !mLineSymbol )
mLineSymbol.reset( QgsLineSymbol::createSimple( QVariantMap() ) );
mSymbol = mLineSymbol.get();
}
else if ( symbolType == Qgis::SymbolType::Marker )
{
if ( !mMarkerSymbol )
mMarkerSymbol.reset( QgsMarkerSymbol::createSimple( QVariantMap() ) );
mSymbol = mMarkerSymbol.get();
}
else
Q_ASSERT( false );
mSymbolType = symbolType;
}
void QgsGeometryGeneratorSymbolLayer::startRender( QgsSymbolRenderContext &context )
{
mExpression->prepare( &context.renderContext().expressionContext() );
subSymbol()->startRender( context.renderContext() );
}
void QgsGeometryGeneratorSymbolLayer::stopRender( QgsSymbolRenderContext &context )
{
if ( mSymbol )
mSymbol->stopRender( context.renderContext() );
}
void QgsGeometryGeneratorSymbolLayer::startFeatureRender( const QgsFeature &, QgsRenderContext & )
{
mRenderingFeature = true;
mHasRenderedFeature = false;
}
void QgsGeometryGeneratorSymbolLayer::stopFeatureRender( const QgsFeature &, QgsRenderContext & )
{
mRenderingFeature = false;
}
bool QgsGeometryGeneratorSymbolLayer::usesMapUnits() const
{
if ( mFillSymbol )
return mFillSymbol->usesMapUnits();
else if ( mLineSymbol )
return mLineSymbol->usesMapUnits();
else if ( mMarkerSymbol )
return mMarkerSymbol->usesMapUnits();
return false;
}
QColor QgsGeometryGeneratorSymbolLayer::color() const
{
if ( mFillSymbol )
return mFillSymbol->color();
else if ( mLineSymbol )
return mLineSymbol->color();
else if ( mMarkerSymbol )
return mMarkerSymbol->color();
return QColor();
}
QgsUnitTypes::RenderUnit QgsGeometryGeneratorSymbolLayer::outputUnit() const
{
if ( mFillSymbol )
return mFillSymbol->outputUnit();
else if ( mLineSymbol )
return mLineSymbol->outputUnit();
else if ( mMarkerSymbol )
return mMarkerSymbol->outputUnit();
return QgsUnitTypes::RenderUnknownUnit;
}
QgsMapUnitScale QgsGeometryGeneratorSymbolLayer::mapUnitScale() const
{
if ( mFillSymbol )
return mFillSymbol->mapUnitScale();
else if ( mLineSymbol )
return mLineSymbol->mapUnitScale();
else if ( mMarkerSymbol )
return mMarkerSymbol->mapUnitScale();
return QgsMapUnitScale();
}
QgsSymbolLayer *QgsGeometryGeneratorSymbolLayer::clone() const
{
QgsGeometryGeneratorSymbolLayer *clone = new QgsGeometryGeneratorSymbolLayer( mExpression->expression() );
if ( mFillSymbol )
clone->mFillSymbol.reset( mFillSymbol->clone() );
if ( mLineSymbol )
clone->mLineSymbol.reset( mLineSymbol->clone() );
if ( mMarkerSymbol )
clone->mMarkerSymbol.reset( mMarkerSymbol->clone() );
clone->setSymbolType( mSymbolType );
clone->setUnits( mUnits );
copyDataDefinedProperties( clone );
copyPaintEffect( clone );
return clone;
}
QVariantMap QgsGeometryGeneratorSymbolLayer::properties() const
{
QVariantMap props;
props.insert( QStringLiteral( "geometryModifier" ), mExpression->expression() );
switch ( mSymbolType )
{
case Qgis::SymbolType::Marker:
props.insert( QStringLiteral( "SymbolType" ), QStringLiteral( "Marker" ) );
break;
case Qgis::SymbolType::Line:
props.insert( QStringLiteral( "SymbolType" ), QStringLiteral( "Line" ) );
break;
default:
props.insert( QStringLiteral( "SymbolType" ), QStringLiteral( "Fill" ) );
break;
}
props.insert( QStringLiteral( "units" ), QgsUnitTypes::encodeUnit( mUnits ) );
return props;
}
void QgsGeometryGeneratorSymbolLayer::drawPreviewIcon( QgsSymbolRenderContext &context, QSize size )
{
if ( mSymbol )
{
// evaluate expression
QgsGeometry patchShapeGeometry;
if ( context.patchShape() && !context.patchShape()->isNull() )
{
patchShapeGeometry = context.patchShape()->scaledGeometry( size );
}
if ( patchShapeGeometry.isEmpty() )
{
Qgis::SymbolType originalSymbolType;
switch ( context.originalGeometryType() )
{
case QgsWkbTypes::PointGeometry:
originalSymbolType = Qgis::SymbolType::Marker;
break;
case QgsWkbTypes::LineGeometry:
originalSymbolType = Qgis::SymbolType::Line;
break;
case QgsWkbTypes::PolygonGeometry:
originalSymbolType = Qgis::SymbolType::Fill;
break;
case QgsWkbTypes::UnknownGeometry:
case QgsWkbTypes::NullGeometry:
originalSymbolType = mSymbol->type();
break;
}
patchShapeGeometry = QgsStyle::defaultStyle()->defaultPatch( originalSymbolType, size ).scaledGeometry( size );
}
// evaluate geometry expression
QgsFeature feature;
if ( context.feature() )
feature = *context.feature();
else
feature.setGeometry( patchShapeGeometry );
const QgsGeometry iconGeometry = evaluateGeometryInPainterUnits( patchShapeGeometry, feature, context.renderContext(), context.renderContext().expressionContext() );
QgsLegendPatchShape evaluatedPatchShape( mSymbol->type(), coerceToExpectedType( iconGeometry ) );
// we don't want to rescale the patch shape to fit the legend symbol size -- we've already considered that here,
// and we don't want to undo the effects of a geometry generator which modifies the symbol bounds
evaluatedPatchShape.setScaleToOutputSize( false );
mSymbol->drawPreviewIcon( context.renderContext().painter(), size, &context.renderContext(), false, &context.renderContext().expressionContext(), &evaluatedPatchShape );
}
}
void QgsGeometryGeneratorSymbolLayer::setGeometryExpression( const QString &exp )
{
mExpression.reset( new QgsExpression( exp ) );
}
bool QgsGeometryGeneratorSymbolLayer::setSubSymbol( QgsSymbol *symbol )
{
switch ( symbol->type() )
{
case Qgis::SymbolType::Marker:
mMarkerSymbol.reset( static_cast<QgsMarkerSymbol *>( symbol ) );
break;
case Qgis::SymbolType::Line:
mLineSymbol.reset( static_cast<QgsLineSymbol *>( symbol ) );
break;
case Qgis::SymbolType::Fill:
mFillSymbol.reset( static_cast<QgsFillSymbol *>( symbol ) );
break;
default:
break;
}
setSymbolType( symbol->type() );
return true;
}
QSet<QString> QgsGeometryGeneratorSymbolLayer::usedAttributes( const QgsRenderContext &context ) const
{
return QgsSymbolLayer::usedAttributes( context )
+ mSymbol->usedAttributes( context )
+ mExpression->referencedColumns();
}
bool QgsGeometryGeneratorSymbolLayer::hasDataDefinedProperties() const
{
// we treat geometry generator layers like they have data defined properties,
// since the WHOLE layer is based on expressions and requires the full expression
// context
return true;
}
bool QgsGeometryGeneratorSymbolLayer::isCompatibleWithSymbol( QgsSymbol *symbol ) const
{
Q_UNUSED( symbol )
return true;
}
QgsGeometry QgsGeometryGeneratorSymbolLayer::evaluateGeometryInPainterUnits( const QgsGeometry &input, const QgsFeature &feature, const QgsRenderContext &renderContext, QgsExpressionContext &expressionContext ) const
{
QgsGeometry drawGeometry( input );
// step 1 - scale the draw geometry from PAINTER units to target units (e.g. millimeters)
const double scale = 1 / renderContext.convertToPainterUnits( 1, mUnits );
const QTransform painterToTargetUnits = QTransform::fromScale( scale, scale );
drawGeometry.transform( painterToTargetUnits );
// step 2 - set the feature to use the new scaled geometry, and inject it into the expression context
QgsFeature f( feature );
f.setGeometry( drawGeometry );
QgsExpressionContextScope *generatorScope = new QgsExpressionContextScope();
QgsExpressionContextScopePopper popper( expressionContext, generatorScope );
generatorScope->setFeature( f );
// step 3 - evaluate the new generated geometry.
QgsGeometry geom = mExpression->evaluate( &expressionContext ).value<QgsGeometry>();
// step 4 - transform geometry back from target units to painter units
geom.transform( painterToTargetUnits.inverted( ) );
return geom;
}
QgsGeometry QgsGeometryGeneratorSymbolLayer::coerceToExpectedType( const QgsGeometry &geometry ) const
{
switch ( mSymbolType )
{
case Qgis::SymbolType::Marker:
if ( geometry.type() != QgsWkbTypes::PointGeometry )
{
QVector< QgsGeometry > geoms = geometry.coerceToType( QgsWkbTypes::MultiPoint );
if ( !geoms.empty() )
return geoms.at( 0 );
}
break;
case Qgis::SymbolType::Line:
if ( geometry.type() != QgsWkbTypes::LineGeometry )
{
QVector< QgsGeometry > geoms = geometry.coerceToType( QgsWkbTypes::MultiLineString );
if ( !geoms.empty() )
return geoms.at( 0 );
}
break;
case Qgis::SymbolType::Fill:
if ( geometry.type() != QgsWkbTypes::PolygonGeometry )
{
QVector< QgsGeometry > geoms = geometry.coerceToType( QgsWkbTypes::MultiPolygon );
if ( !geoms.empty() )
return geoms.at( 0 );
}
break;
case Qgis::SymbolType::Hybrid:
break;
}
return geometry;
}
void QgsGeometryGeneratorSymbolLayer::render( QgsSymbolRenderContext &context, QgsWkbTypes::GeometryType geometryType, const QPolygonF *points, const QVector<QPolygonF> *rings )
{
if ( mRenderingFeature && mHasRenderedFeature )
return;
QgsExpressionContext &expressionContext = context.renderContext().expressionContext();
QgsFeature f = expressionContext.feature();
if ( ( !context.feature() || context.renderContext().flags() & Qgis::RenderContextFlag::RenderingSubSymbol ) && points )
{
// oh dear, we don't have a feature to work from... but that's ok, we are probably being rendered as a plain old symbol!
// in this case we need to build up a feature which represents the points being rendered.
// note that we also do this same logic when we are rendering a subsymbol. In that case the $geometry part of the
// expression should refer to the shape of the subsymbol being rendered, NOT the feature's original geometry
QgsGeometry drawGeometry;
// step 1 - convert points and rings to geometry
switch ( geometryType )
{
case QgsWkbTypes::PointGeometry:
{
Q_ASSERT( points->size() == 1 );
drawGeometry = QgsGeometry::fromPointXY( points->at( 0 ) );
break;
}
case QgsWkbTypes::LineGeometry:
{
Q_ASSERT( !rings );
std::unique_ptr < QgsLineString > ring( QgsLineString::fromQPolygonF( *points ) );
drawGeometry = QgsGeometry( std::move( ring ) );
break;
}
case QgsWkbTypes::PolygonGeometry:
{
std::unique_ptr < QgsLineString > exterior( QgsLineString::fromQPolygonF( *points ) );
std::unique_ptr< QgsPolygon > polygon = std::make_unique< QgsPolygon >();
polygon->setExteriorRing( exterior.release() );
if ( rings )
{
for ( const QPolygonF &ring : *rings )
{
polygon->addInteriorRing( QgsLineString::fromQPolygonF( ring ) );
}
}
drawGeometry = QgsGeometry( std::move( polygon ) );
break;
}
case QgsWkbTypes::UnknownGeometry:
case QgsWkbTypes::NullGeometry:
return; // unreachable
}
// step 2 - evaluate the result
QgsGeometry result = evaluateGeometryInPainterUnits( drawGeometry, f, context.renderContext(), expressionContext );
// We transform back to map units here (from painter units)
// as we'll ultimately be calling renderFeature, which excepts the feature has a geometry in map units.
// Here we also scale the transform by the target unit to painter units factor to reverse that conversion
QTransform mapToPixel = context.renderContext().mapToPixel().transform();
result.transform( mapToPixel.inverted() );
// also need to apply the coordinate transform from the render context
try
{
result.transform( context.renderContext().coordinateTransform(), Qgis::TransformDirection::Reverse );
}
catch ( QgsCsException & )
{
QgsDebugMsg( QStringLiteral( "Could no transform generated geometry to layer CRS" ) );
}
f.setGeometry( coerceToExpectedType( result ) );
}
else if ( context.feature() )
{
switch ( mUnits )
{
case QgsUnitTypes::RenderMapUnits:
case QgsUnitTypes::RenderUnknownUnit: // unsupported, not exposed as an option
case QgsUnitTypes::RenderMetersInMapUnits: // unsupported, not exposed as an option
case QgsUnitTypes::RenderPercentage: // unsupported, not exposed as an option
{
QgsGeometry geom = mExpression->evaluate( &expressionContext ).value<QgsGeometry>();
f.setGeometry( coerceToExpectedType( geom ) );
break;
}
case QgsUnitTypes::RenderMillimeters:
case QgsUnitTypes::RenderPixels:
case QgsUnitTypes::RenderPoints:
case QgsUnitTypes::RenderInches:
{
// convert feature geometry to painter units
QgsGeometry transformed = f.geometry();
transformed.transform( context.renderContext().coordinateTransform() );
const QTransform mapToPixel = context.renderContext().mapToPixel().transform();
transformed.transform( mapToPixel );
QgsGeometry result = evaluateGeometryInPainterUnits( transformed, f, context.renderContext(), expressionContext );
// We transform back to map units here (from painter units)
// as we'll ultimately be calling renderFeature, which excepts the feature has a geometry in map units.
// Here we also scale the transform by the target unit to painter units factor to reverse that conversion
result.transform( mapToPixel.inverted() );
// also need to apply the coordinate transform from the render context
try
{
result.transform( context.renderContext().coordinateTransform(), Qgis::TransformDirection::Reverse );
}
catch ( QgsCsException & )
{
QgsDebugMsg( QStringLiteral( "Could no transform generated geometry to layer CRS" ) );
}
f.setGeometry( coerceToExpectedType( result ) );
break;
}
}
}
QgsExpressionContextScope *subSymbolExpressionContextScope = mSymbol->symbolRenderContext()->expressionContextScope();
subSymbolExpressionContextScope->setFeature( f );
const bool prevIsSubsymbol = context.renderContext().flags() & Qgis::RenderContextFlag::RenderingSubSymbol;
context.renderContext().setFlag( Qgis::RenderContextFlag::RenderingSubSymbol );
mSymbol->renderFeature( f, context.renderContext(), -1, context.selected() );
context.renderContext().setFlag( Qgis::RenderContextFlag::RenderingSubSymbol, prevIsSubsymbol );
if ( mRenderingFeature )
mHasRenderedFeature = true;
}
void QgsGeometryGeneratorSymbolLayer::setColor( const QColor &color )
{
mSymbol->setColor( color );
}