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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 "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 "qgsdatadefined.h"
#include "qgsvectorlayer.h"
#include "qgsgeometry.h"
#include "qgsmultipoint.h"
#include "qgsgeometrycollection.h"
#include "qgslinestring.h"
#include "qgspolygon.h"
#include "qgsclipper.h"
#include <QColor>
#include <QImage>
#include <QPainter>
#include <QSize>
#include <QSvgGenerator>
#include <cmath>
#include <map>
inline
QgsDataDefined* rotateWholeSymbol( double additionalRotation, const QgsDataDefined& dd )
{
QgsDataDefined* rotatedDD = new QgsDataDefined( dd );
QString exprString = dd.useExpression() ? dd.expressionString() : dd.field();
rotatedDD->setExpressionString( QString::number( additionalRotation ) + " + (" + exprString + ')' );
rotatedDD->setUseExpression( true );
return rotatedDD;
}
inline
QgsDataDefined* scaleWholeSymbol( double scaleFactor, const QgsDataDefined& dd )
{
QgsDataDefined* scaledDD = new QgsDataDefined( dd );
QString exprString = dd.useExpression() ? dd.expressionString() : dd.field();
scaledDD->setExpressionString( QString::number( scaleFactor ) + "*(" + exprString + ')' );
scaledDD->setUseExpression( true );
return scaledDD;
}
inline
QgsDataDefined* scaleWholeSymbol( double scaleFactorX, double scaleFactorY, const QgsDataDefined& dd )
{
QgsDataDefined* scaledDD = new QgsDataDefined( dd );
QString exprString = dd.useExpression() ? dd.expressionString() : dd.field();
scaledDD->setExpressionString(
( !qgsDoubleNear( scaleFactorX, 0.0 ) ? "tostring(" + QString::number( scaleFactorX ) + "*(" + exprString + "))" : QStringLiteral( "'0'" ) ) +
"|| ',' || " +
( !qgsDoubleNear( scaleFactorY, 0.0 ) ? "tostring(" + QString::number( scaleFactorY ) + "*(" + exprString + "))" : QStringLiteral( "'0'" ) ) );
scaledDD->setUseExpression( true );
return scaledDD;
}
////////////////////
QgsSymbol::QgsSymbol( SymbolType type, const QgsSymbolLayerList& layers )
: mType( type )
, mLayers( layers )
, mAlpha( 1.0 )
, mRenderHints( 0 )
, mClipFeaturesToExtent( true )
, mLayer( nullptr )
, mSymbolRenderContext( nullptr )
{
// 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-- );
}
}
}
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() )
{
ct.transformPolygon( pts );
}
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, bool clipToExtent )
{
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();
//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() )
{
ct.transformPolygon( poly );
}
QPointF *ptr = poly.data();
for ( int i = 0; i < poly.size(); ++i, ++ptr )
{
mtp.transformInPlace( ptr->rx(), ptr->ry() );
}
return poly;
}
void QgsSymbol::_getPolygon( QPolygonF& pts, QList<QPolygonF>& holes, QgsRenderContext &context, const QgsPolygonV2& polygon, bool clipToExtent )
{
holes.clear();
pts = _getPolygonRing( context, *polygon.exteriorRing(), clipToExtent );
for ( int idx = 0; idx < polygon.numInteriorRings(); idx++ )
{
const QPolygonF hole = _getPolygonRing( context, *( polygon.interiorRing( idx ) ), clipToExtent );
if ( !hole.isEmpty() ) holes.append( hole );
}
}
QgsSymbol::~QgsSymbol()
{
delete mSymbolRenderContext;
// 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 )
{
Q_FOREACH ( QgsSymbolLayer* layer, mLayers )
{
layer->setOutputUnit( u );
}
}
void QgsSymbol::setMapUnitScale( const QgsMapUnitScale &scale )
{
Q_FOREACH ( QgsSymbolLayer* layer, mLayers )
{
layer->setMapUnitScale( scale );
}
}
QgsSymbol* QgsSymbol::defaultSymbol( QgsWkbTypes::GeometryType geomType )
{
QgsSymbol* s = nullptr;
// 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" ), QLatin1String( "" ) );
break;
case QgsWkbTypes::LineGeometry :
defaultSymbol = QgsProject::instance()->readEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/Line" ), QLatin1String( "" ) );
break;
case QgsWkbTypes::PolygonGeometry :
defaultSymbol = QgsProject::instance()->readEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/Fill" ), QLatin1String( "" ) );
break;
default:
defaultSymbol = QLatin1String( "" );
break;
}
if ( defaultSymbol != QLatin1String( "" ) )
s = QgsStyle::defaultStyle()->symbol( defaultSymbol );
// if no default found for this type, get global default (as previously)
if ( ! s )
{
switch ( geomType )
{
case QgsWkbTypes::PointGeometry:
s = new QgsMarkerSymbol();
break;
case QgsWkbTypes::LineGeometry:
s = new QgsLineSymbol();
break;
case QgsWkbTypes::PolygonGeometry:
s = new QgsFillSymbol();
break;
default:
QgsDebugMsg( "unknown layer's geometry type" );
return nullptr;
}
}
// set alpha transparency
s->setAlpha( QgsProject::instance()->readDoubleEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/AlphaInt" ), 255 ) / 255.0 );
// set random color, it project prefs allow
if ( defaultSymbol == QLatin1String( "" ) ||
QgsProject::instance()->readBoolEntry( QStringLiteral( "DefaultStyles" ), QStringLiteral( "/RandomColors" ), true ) )
{
s->setColor( QColor::fromHsv( qrand() % 360, 64 + qrand() % 192, 128 + qrand() % 128 ) );
}
return s;
}
QgsSymbolLayer* QgsSymbol::symbolLayer( int layer )
{
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 )
{
delete mSymbolRenderContext;
mSymbolRenderContext = new QgsSymbolRenderContext( context, outputUnit(), mAlpha, false, mRenderHints, nullptr, fields, mapUnitScale() );
QgsSymbolRenderContext symbolContext( context, outputUnit(), mAlpha, false, mRenderHints, nullptr, fields, mapUnitScale() );
QgsExpressionContextScope* scope = QgsExpressionContextUtils::updateSymbolScope( this, new QgsExpressionContextScope() );
mSymbolRenderContext->setExpressionContextScope( scope );
Q_FOREACH ( QgsSymbolLayer* layer, mLayers )
{
if ( !layer->enabled() )
continue;
layer->prepareExpressions( symbolContext );
layer->startRender( symbolContext );
}
}
void QgsSymbol::stopRender( QgsRenderContext& context )
{
Q_UNUSED( context )
if ( mSymbolRenderContext )
{
Q_FOREACH ( QgsSymbolLayer* layer, mLayers )
{
if ( !layer->enabled() )
continue;
layer->stopRender( *mSymbolRenderContext );
}
}
delete mSymbolRenderContext;
mSymbolRenderContext = nullptr;
mLayer = nullptr;
}
void QgsSymbol::setColor( const QColor& color )
{
Q_FOREACH ( QgsSymbolLayer* layer, mLayers )
{
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 )
{
QgsRenderContext context = customContext ? *customContext : QgsSymbolLayerUtils::createRenderContext( painter );
context.setForceVectorOutput( true );
QgsSymbolRenderContext symbolContext( context, outputUnit(), mAlpha, false, mRenderHints, nullptr, QgsFields(), mapUnitScale() );
Q_FOREACH ( QgsSymbolLayer* layer, mLayers )
{
if ( !layer->enabled() )
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 outline
QgsLineSymbolLayer* lsl = dynamic_cast<QgsLineSymbolLayer*>( layer );
if ( lsl )
{
// from QgsFillSymbolLayer::drawPreviewIcon()
QPolygonF poly = QRectF( QPointF( 0, 0 ), QPointF( size.width() - 1, size.height() - 1 ) );
lsl->startRender( symbolContext );
lsl->renderPolygonOutline( poly, nullptr, symbolContext );
lsl->stopRender( symbolContext );
}
}
else
layer->drawPreviewIcon( symbolContext, size );
}
}
void QgsSymbol::exportImage( const QString& path, const QString& format, QSize size )
{
if ( format.toLower() == QLatin1String( "svg" ) )
{
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 antialising
if ( mType == QgsSymbol::Marker )
{
p.setPen( QPen( Qt::gray ) );
p.drawLine( 0, 50, 100, 50 );
p.drawLine( 50, 0, 50, 100 );
}
QgsRenderContext context = QgsSymbolLayerUtils::createRenderContext( &p );
if ( expressionContext )
context.setExpressionContext( *expressionContext );
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( 0 && "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( alpha() );
double scaleFactor = 1.0;
props[ QStringLiteral( "uom" )] = QgsSymbolLayerUtils::encodeSldUom( outputUnit(), &scaleFactor );
props[ QStringLiteral( "uomScale" )] = ( !qgsDoubleNear( scaleFactor, 1.0 ) ? qgsDoubleToString( scaleFactor ) : QLatin1String( "" ) );
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->hasDataDefinedProperty( QgsSymbolLayer::EXPR_LAYER_ENABLED ) )
{
bool ok = false;
bool enabled = layer->evaluateDataDefinedProperty( QgsSymbolLayer::EXPR_LAYER_ENABLED, context, QVariant(), &ok ).toBool();
if ( ok && !enabled )
return;
}
QgsGeometryGeneratorSymbolLayer* generatorLayer = static_cast<QgsGeometryGeneratorSymbolLayer*>( layer );
QgsPaintEffect* effect = generatorLayer->paintEffect();
if ( effect && effect->enabled() )
{
QPainter* p = context.renderContext().painter();
p->save();
effect->begin( context.renderContext() );
generatorLayer->render( context );
effect->end( context.renderContext() );
p->restore();
}
else
{
generatorLayer->render( context );
}
}
QSet<QString> QgsSymbol::usedAttributes() const
{
QSet<QString> attributes;
QgsSymbolLayerList::const_iterator sIt = mLayers.constBegin();
for ( ; sIt != mLayers.constEnd(); ++sIt )
{
if ( *sIt )
{
attributes.unite(( *sIt )->usedAttributes() );
}
}
return attributes;
}
bool QgsSymbol::hasDataDefinedProperties() const
{
Q_FOREACH ( QgsSymbolLayer* layer, mLayers )
{
if ( layer->hasDataDefinedProperties() )
return true;
}
return false;
}
void QgsSymbol::renderFeature( const QgsFeature& feature, QgsRenderContext& context, int layer, bool selected, bool drawVertexMarker, int currentVertexMarkerType, int currentVertexMarkerSize )
{
QgsGeometry geom = feature.geometry();
if ( geom.isEmpty() )
{
return;
}
QgsGeometry segmentizedGeometry = geom;
bool usingSegmentizedGeometry = false;
context.setGeometry( geom.geometry() );
bool tileMapRendering = context.testFlag( QgsRenderContext::RenderMapTile );
//convert curve types to normal point/line/polygon ones
if ( QgsWkbTypes::isCurvedType( geom.geometry()->wkbType() ) )
{
QgsAbstractGeometry *g = geom.geometry()->segmentize( context.segmentationTolerance(), context.segmentationToleranceType() );
if ( !g )
{
return;
}
segmentizedGeometry = QgsGeometry( g );
usingSegmentizedGeometry = true;
}
mSymbolRenderContext->setGeometryPartCount( segmentizedGeometry.geometry()->partCount() );
mSymbolRenderContext->setGeometryPartNum( 1 );
if ( mSymbolRenderContext->expressionContextScope() )
{
context.expressionContext().appendScope( mSymbolRenderContext->expressionContextScope() );
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 );
}
switch ( QgsWkbTypes::flatType( segmentizedGeometry.geometry()->wkbType() ) )
{
case QgsWkbTypes::Point:
{
if ( mType != QgsSymbol::Marker )
{
QgsDebugMsg( "point can be drawn only with marker symbol!" );
break;
}
const QgsPointV2* point = static_cast< const QgsPointV2* >( segmentizedGeometry.geometry() );
const QPointF pt = _getPoint( context, *point );
static_cast<QgsMarkerSymbol*>( this )->renderPoint( pt, &feature, context, layer, selected );
if ( context.testFlag( QgsRenderContext::DrawSymbolBounds ) )
{
//draw debugging rect
context.painter()->setPen( Qt::red );
context.painter()->setBrush( QColor( 255, 0, 0, 100 ) );
context.painter()->drawRect( static_cast<QgsMarkerSymbol*>( this )->bounds( pt, context, feature ) );
}
if ( drawVertexMarker && !usingSegmentizedGeometry )
{
markers << pt;
}
}
break;
case QgsWkbTypes::LineString:
{
if ( mType != QgsSymbol::Line )
{
QgsDebugMsg( "linestring can be drawn only with line symbol!" );
break;
}
const QgsCurve& curve = dynamic_cast<const QgsCurve&>( *segmentizedGeometry.geometry() );
const QPolygonF pts = _getLineString( context, curve, !tileMapRendering && clipFeaturesToExtent() );
static_cast<QgsLineSymbol*>( this )->renderPolyline( pts, &feature, context, layer, selected );
if ( drawVertexMarker && !usingSegmentizedGeometry )
{
markers = pts;
}
}
break;
case QgsWkbTypes::Polygon:
{
QPolygonF pts;
QList<QPolygonF> holes;
if ( mType != QgsSymbol::Fill )
{
QgsDebugMsg( "polygon can be drawn only with fill symbol!" );
break;
}
const QgsPolygonV2& polygon = dynamic_cast<const QgsPolygonV2&>( *segmentizedGeometry.geometry() );
_getPolygon( pts, holes, context, polygon, !tileMapRendering && clipFeaturesToExtent() );
static_cast<QgsFillSymbol*>( this )->renderPolygon( pts, ( !holes.isEmpty() ? &holes : nullptr ), &feature, context, layer, selected );
if ( drawVertexMarker && !usingSegmentizedGeometry )
{
markers = pts;
Q_FOREACH ( const QPolygonF& hole, holes )
{
markers << hole;
}
}
}
break;
case QgsWkbTypes::MultiPoint:
{
if ( mType != QgsSymbol::Marker )
{
QgsDebugMsg( "multi-point can be drawn only with marker symbol!" );
break;
}
const QgsMultiPointV2& mp = static_cast< const QgsMultiPointV2& >( *segmentizedGeometry.geometry() );
if ( drawVertexMarker && !usingSegmentizedGeometry )
{
markers.reserve( mp.numGeometries() );
}
for ( int i = 0; i < mp.numGeometries(); ++i )
{
mSymbolRenderContext->setGeometryPartNum( i + 1 );
mSymbolRenderContext->expressionContextScope()->addVariable( QgsExpressionContextScope::StaticVariable( QgsExpressionContext::EXPR_GEOMETRY_PART_NUM, i + 1, true ) );
const QgsPointV2& point = static_cast< const QgsPointV2& >( *mp.geometryN( i ) );
const QPointF pt = _getPoint( context, point );
static_cast<QgsMarkerSymbol*>( this )->renderPoint( pt, &feature, context, layer, selected );
if ( drawVertexMarker && !usingSegmentizedGeometry )
{
markers.append( pt );
}
}
}
break;
case QgsWkbTypes::MultiCurve:
case QgsWkbTypes::MultiLineString:
{
if ( mType != QgsSymbol::Line )
{
QgsDebugMsg( "multi-linestring can be drawn only with line symbol!" );
break;
}
const QgsGeometryCollection& geomCollection = dynamic_cast<const QgsGeometryCollection&>( *segmentizedGeometry.geometry() );
const unsigned int num = geomCollection.numGeometries();
for ( unsigned int i = 0; i < num; ++i )
{
mSymbolRenderContext->setGeometryPartNum( i + 1 );
mSymbolRenderContext->expressionContextScope()->addVariable( QgsExpressionContextScope::StaticVariable( QgsExpressionContext::EXPR_GEOMETRY_PART_NUM, i + 1, true ) );
context.setGeometry( geomCollection.geometryN( i ) );
const QgsCurve& curve = dynamic_cast<const QgsCurve&>( *geomCollection.geometryN( i ) );
const QPolygonF pts = _getLineString( context, curve, !tileMapRendering && clipFeaturesToExtent() );
static_cast<QgsLineSymbol*>( this )->renderPolyline( pts, &feature, context, layer, selected );
if ( drawVertexMarker && !usingSegmentizedGeometry )
{
if ( i == 0 )
{
markers = pts;
}
else
{
markers << pts;
}
}
}
}
break;
case QgsWkbTypes::MultiSurface:
case QgsWkbTypes::MultiPolygon:
{
if ( mType != QgsSymbol::Fill )
{
QgsDebugMsg( "multi-polygon can be drawn only with fill symbol!" );
break;
}
QPolygonF pts;
QList<QPolygonF> holes;
const QgsGeometryCollection& geomCollection = dynamic_cast<const QgsGeometryCollection&>( *segmentizedGeometry.geometry() );
const unsigned int num = geomCollection.numGeometries();
// Sort components by approximate area (probably a bit faster than using
// area() )
std::map<double, QList<unsigned int> > mapAreaToPartNum;
for ( unsigned int i = 0; i < num; ++i )
{
const QgsPolygonV2& polygon = dynamic_cast<const QgsPolygonV2&>( *geomCollection.geometryN( i ) );
const QgsRectangle r( polygon.boundingBox() );
mapAreaToPartNum[ r.width() * r.height()] << i;
}
// Draw starting with larger parts down to smaller parts, so that in
// case of a part being incorrectly inside another part, it is drawn
// on top of it (#15419)
std::map<double, QList<unsigned int> >::const_reverse_iterator iter = mapAreaToPartNum.rbegin();
for ( ; iter != mapAreaToPartNum.rend(); ++iter )
{
const QList<unsigned int>& listPartIndex = iter->second;
for ( int idx = 0; idx < listPartIndex.size(); ++idx )
{
const unsigned i = listPartIndex[idx];
mSymbolRenderContext->setGeometryPartNum( i + 1 );
mSymbolRenderContext->expressionContextScope()->addVariable( QgsExpressionContextScope::StaticVariable( QgsExpressionContext::EXPR_GEOMETRY_PART_NUM, i + 1, true ) );
context.setGeometry( geomCollection.geometryN( i ) );
const QgsPolygonV2& polygon = dynamic_cast<const QgsPolygonV2&>( *geomCollection.geometryN( i ) );
_getPolygon( pts, holes, context, polygon, !tileMapRendering && clipFeaturesToExtent() );
static_cast<QgsFillSymbol*>( this )->renderPolygon( pts, ( !holes.isEmpty() ? &holes : nullptr ), &feature, context, layer, selected );
if ( drawVertexMarker && !usingSegmentizedGeometry )
{
if ( i == 0 )
{
markers = pts;
}
else
{
markers << pts;
}
Q_FOREACH ( const QPolygonF& hole, holes )
{
markers << hole;
}
}
}
}
break;
}
case QgsWkbTypes::GeometryCollection:
{
const QgsGeometryCollection& geomCollection = dynamic_cast<const QgsGeometryCollection&>( *segmentizedGeometry.geometry() );
if ( geomCollection.numGeometries() == 0 )
{
// skip noise from empty geometry collections from simplification
break;
}
FALLTHROUGH;
}
default:
QgsDebugMsg( QString( "feature %1: unsupported wkb type %2/%3 for rendering" )
.arg( feature.id() )
.arg( QgsWkbTypes::displayString( geom.geometry()->wkbType() ) )
.arg( geom.wkbType(), 0, 16 ) );
}
if ( drawVertexMarker )
{
if ( markers.size() > 0 )
{
Q_FOREACH ( QPointF marker, markers )
{
renderVertexMarker( marker, context, currentVertexMarkerType, currentVertexMarkerSize );
}
}
else
{
QgsCoordinateTransform ct = context.coordinateTransform();
const QgsMapToPixel& mtp = context.mapToPixel();
QgsPointV2 vertexPoint;
QgsVertexId vertexId;
double x, y, z;
QPointF mapPoint;
while ( geom.geometry()->nextVertex( vertexId, vertexPoint ) )
{
//transform
x = vertexPoint.x();
y = vertexPoint.y();
z = 0.0;
if ( ct.isValid() )
{
ct.transformInPlace( x, y, z );
}
mapPoint.setX( x );
mapPoint.setY( y );
mtp.transformInPlace( mapPoint.rx(), mapPoint.ry() );
renderVertexMarker( mapPoint, context, currentVertexMarkerType, currentVertexMarkerSize );
}
}
}
if ( mSymbolRenderContext->expressionContextScope() )
context.expressionContext().popScope();
}
QgsSymbolRenderContext* QgsSymbol::symbolRenderContext()
{
return mSymbolRenderContext;
}
void QgsSymbol::renderVertexMarker( QPointF pt, QgsRenderContext& context, int currentVertexMarkerType, int currentVertexMarkerSize )
{
QgsVectorLayer::drawVertexMarker( pt.x(), pt.y(), *context.painter(), static_cast< QgsVectorLayer::VertexMarkerType >( currentVertexMarkerType ), currentVertexMarkerSize );
}
////////////////////
QgsSymbolRenderContext::QgsSymbolRenderContext( QgsRenderContext& c, QgsUnitTypes::RenderUnit u, qreal alpha, bool selected, QgsSymbol::RenderHints renderHints, const QgsFeature* f, const QgsFields& fields, const QgsMapUnitScale& mapUnitScale )
: mRenderContext( c )
, mExpressionContextScope( nullptr )
, mOutputUnit( u )
, mMapUnitScale( mapUnitScale )
, mAlpha( alpha )
, mSelected( selected )
, mRenderHints( renderHints )
, mFeature( f )
, mFields( fields )
, mGeometryPartCount( 0 )
, mGeometryPartNum( 0 )
{