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qgspointdisplacementrenderer.cpp
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qgspointdisplacementrenderer.cpp
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/***************************************************************************
qgspointdisplacementrenderer.cpp
--------------------------------
begin : January 26, 2010
copyright : (C) 2010 by Marco Hugentobler
email : marco at hugis dot net
***************************************************************************/
/***************************************************************************
* *
* 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 "qgspointdisplacementrenderer.h"
#include "qgssymbollayerutils.h"
#include "qgsfontutils.h"
#include "qgspainteffectregistry.h"
#include "qgspainteffect.h"
#include "qgspointclusterrenderer.h"
#include "qgsstyleentityvisitor.h"
#include "qgsrenderedfeaturehandlerinterface.h"
#include "qgsmarkersymbol.h"
#include <QPainter>
#include <cmath>
QgsPointDisplacementRenderer::QgsPointDisplacementRenderer( const QString &labelAttributeName )
: QgsPointDistanceRenderer( QStringLiteral( "pointDisplacement" ), labelAttributeName )
, mCircleColor( QColor( 125, 125, 125 ) )
{
mCenterSymbol.reset( new QgsMarkerSymbol() );
}
QgsPointDisplacementRenderer *QgsPointDisplacementRenderer::clone() const
{
QgsPointDisplacementRenderer *r = new QgsPointDisplacementRenderer( mLabelAttributeName );
if ( mRenderer )
r->setEmbeddedRenderer( mRenderer->clone() );
r->setCircleWidth( mCircleWidth );
r->setCircleColor( mCircleColor );
r->setLabelFont( mLabelFont );
r->setLabelColor( mLabelColor );
r->setPlacement( mPlacement );
r->setCircleRadiusAddition( mCircleRadiusAddition );
r->setLabelDistanceFactor( mLabelDistanceFactor );
r->setMinimumLabelScale( mMinLabelScale );
r->setTolerance( mTolerance );
r->setToleranceUnit( mToleranceUnit );
r->setToleranceMapUnitScale( mToleranceMapUnitScale );
if ( mCenterSymbol )
{
r->setCenterSymbol( mCenterSymbol->clone() );
}
copyRendererData( r );
return r;
}
void QgsPointDisplacementRenderer::drawGroup( QPointF centerPoint, QgsRenderContext &context, const ClusteredGroup &group )
{
//calculate max diagonal size from all symbols in group
double diagonal = 0;
QVector<double> diagonals( group.size() );
double currentDiagonal;
int groupPosition = 0;
for ( const GroupedFeature &feature : group )
{
if ( QgsMarkerSymbol *symbol = feature.symbol() )
{
currentDiagonal = M_SQRT2 * symbol->size( context );
diagonals[groupPosition] = currentDiagonal;
diagonal = std::max( diagonal, currentDiagonal );
}
else
{
diagonals[groupPosition] = 0.0;
}
groupPosition++;
}
QgsSymbolRenderContext symbolContext( context, QgsUnitTypes::RenderMillimeters, 1.0, false );
QList<QPointF> symbolPositions;
QList<QPointF> labelPositions;
double circleRadius = -1.0;
double gridRadius = -1.0;
int gridSize = -1;
calculateSymbolAndLabelPositions( symbolContext, centerPoint, group.size(), diagonal, symbolPositions, labelPositions, circleRadius, gridRadius, gridSize, diagonals );
//only draw circle/grid if there's a pen present - otherwise skip drawing transparent grids
if ( mCircleColor.isValid() && mCircleColor.alpha() > 0 )
{
//draw circle
if ( circleRadius > 0 )
drawCircle( circleRadius, symbolContext, centerPoint, group.size() );
//draw grid
else
drawGrid( gridSize, symbolContext, symbolPositions, group.size() );
}
if ( group.size() > 1 )
{
//draw mid point
QgsFeature firstFeature = group.at( 0 ).feature;
if ( mCenterSymbol )
{
mCenterSymbol->renderPoint( centerPoint, &firstFeature, context, -1, false );
}
else
{
const double rectSize = symbolContext.renderContext().convertToPainterUnits( 1, QgsUnitTypes::RenderMillimeters );
context.painter()->drawRect( QRectF( centerPoint.x() - rectSize, centerPoint.y() - rectSize, rectSize * 2, rectSize * 2 ) );
}
}
//draw symbols on the circle
drawSymbols( group, context, symbolPositions );
//and also the labels
if ( mLabelIndex >= 0 )
{
drawLabels( centerPoint, symbolContext, labelPositions, group );
}
}
void QgsPointDisplacementRenderer::startRender( QgsRenderContext &context, const QgsFields &fields )
{
if ( mCenterSymbol )
{
mCenterSymbol->startRender( context, fields );
}
QgsPointDistanceRenderer::startRender( context, fields );
}
void QgsPointDisplacementRenderer::stopRender( QgsRenderContext &context )
{
QgsPointDistanceRenderer::stopRender( context );
if ( mCenterSymbol )
{
mCenterSymbol->stopRender( context );
}
}
QgsFeatureRenderer *QgsPointDisplacementRenderer::create( QDomElement &symbologyElem, const QgsReadWriteContext &context )
{
QgsPointDisplacementRenderer *r = new QgsPointDisplacementRenderer();
r->setLabelAttributeName( symbologyElem.attribute( QStringLiteral( "labelAttributeName" ) ) );
QFont labelFont;
if ( !QgsFontUtils::setFromXmlChildNode( labelFont, symbologyElem, QStringLiteral( "labelFontProperties" ) ) )
{
labelFont.fromString( symbologyElem.attribute( QStringLiteral( "labelFont" ), QString() ) );
}
r->setLabelFont( labelFont );
r->setPlacement( static_cast< Placement >( symbologyElem.attribute( QStringLiteral( "placement" ), QStringLiteral( "0" ) ).toInt() ) );
r->setCircleWidth( symbologyElem.attribute( QStringLiteral( "circleWidth" ), QStringLiteral( "0.4" ) ).toDouble() );
r->setCircleColor( QgsSymbolLayerUtils::decodeColor( symbologyElem.attribute( QStringLiteral( "circleColor" ), QString() ) ) );
r->setLabelColor( QgsSymbolLayerUtils::decodeColor( symbologyElem.attribute( QStringLiteral( "labelColor" ), QString() ) ) );
r->setCircleRadiusAddition( symbologyElem.attribute( QStringLiteral( "circleRadiusAddition" ), QStringLiteral( "0.0" ) ).toDouble() );
r->setLabelDistanceFactor( symbologyElem.attribute( QStringLiteral( "labelDistanceFactor" ), QStringLiteral( "0.5" ) ).toDouble() );
r->setMinimumLabelScale( symbologyElem.attribute( QStringLiteral( "maxLabelScaleDenominator" ), QStringLiteral( "-1" ) ).toDouble() );
r->setTolerance( symbologyElem.attribute( QStringLiteral( "tolerance" ), QStringLiteral( "0.00001" ) ).toDouble() );
r->setToleranceUnit( QgsUnitTypes::decodeRenderUnit( symbologyElem.attribute( QStringLiteral( "toleranceUnit" ), QStringLiteral( "MapUnit" ) ) ) );
r->setToleranceMapUnitScale( QgsSymbolLayerUtils::decodeMapUnitScale( symbologyElem.attribute( QStringLiteral( "toleranceUnitScale" ) ) ) );
//look for an embedded renderer <renderer-v2>
QDomElement embeddedRendererElem = symbologyElem.firstChildElement( QStringLiteral( "renderer-v2" ) );
if ( !embeddedRendererElem.isNull() )
{
r->setEmbeddedRenderer( QgsFeatureRenderer::load( embeddedRendererElem, context ) );
}
//center symbol
QDomElement centerSymbolElem = symbologyElem.firstChildElement( QStringLiteral( "symbol" ) );
if ( !centerSymbolElem.isNull() )
{
r->setCenterSymbol( QgsSymbolLayerUtils::loadSymbol<QgsMarkerSymbol>( centerSymbolElem, context ) );
}
return r;
}
QgsMarkerSymbol *QgsPointDisplacementRenderer::centerSymbol()
{
return mCenterSymbol.get();
}
QDomElement QgsPointDisplacementRenderer::save( QDomDocument &doc, const QgsReadWriteContext &context )
{
QDomElement rendererElement = doc.createElement( RENDERER_TAG_NAME );
rendererElement.setAttribute( QStringLiteral( "type" ), QStringLiteral( "pointDisplacement" ) );
rendererElement.setAttribute( QStringLiteral( "labelAttributeName" ), mLabelAttributeName );
rendererElement.appendChild( QgsFontUtils::toXmlElement( mLabelFont, doc, QStringLiteral( "labelFontProperties" ) ) );
rendererElement.setAttribute( QStringLiteral( "circleWidth" ), QString::number( mCircleWidth ) );
rendererElement.setAttribute( QStringLiteral( "circleColor" ), QgsSymbolLayerUtils::encodeColor( mCircleColor ) );
rendererElement.setAttribute( QStringLiteral( "labelColor" ), QgsSymbolLayerUtils::encodeColor( mLabelColor ) );
rendererElement.setAttribute( QStringLiteral( "circleRadiusAddition" ), QString::number( mCircleRadiusAddition ) );
rendererElement.setAttribute( QStringLiteral( "labelDistanceFactor" ), QString::number( mLabelDistanceFactor ) );
rendererElement.setAttribute( QStringLiteral( "placement" ), static_cast< int >( mPlacement ) );
rendererElement.setAttribute( QStringLiteral( "maxLabelScaleDenominator" ), QString::number( mMinLabelScale ) );
rendererElement.setAttribute( QStringLiteral( "tolerance" ), QString::number( mTolerance ) );
rendererElement.setAttribute( QStringLiteral( "toleranceUnit" ), QgsUnitTypes::encodeUnit( mToleranceUnit ) );
rendererElement.setAttribute( QStringLiteral( "toleranceUnitScale" ), QgsSymbolLayerUtils::encodeMapUnitScale( mToleranceMapUnitScale ) );
if ( mRenderer )
{
QDomElement embeddedRendererElem = mRenderer->save( doc, context );
rendererElement.appendChild( embeddedRendererElem );
}
if ( mCenterSymbol )
{
QDomElement centerSymbolElem = QgsSymbolLayerUtils::saveSymbol( QStringLiteral( "centerSymbol" ), mCenterSymbol.get(), doc, context );
rendererElement.appendChild( centerSymbolElem );
}
saveRendererData( doc, rendererElement, context );
return rendererElement;
}
QSet<QString> QgsPointDisplacementRenderer::usedAttributes( const QgsRenderContext &context ) const
{
QSet<QString> attr = QgsPointDistanceRenderer::usedAttributes( context );
if ( mCenterSymbol )
attr.unite( mCenterSymbol->usedAttributes( context ) );
return attr;
}
bool QgsPointDisplacementRenderer::accept( QgsStyleEntityVisitorInterface *visitor ) const
{
if ( !QgsPointDistanceRenderer::accept( visitor ) )
return false;
if ( mCenterSymbol )
{
QgsStyleSymbolEntity entity( mCenterSymbol.get() );
if ( !visitor->visit( QgsStyleEntityVisitorInterface::StyleLeaf( &entity, QStringLiteral( "center" ), QObject::tr( "Center Symbol" ) ) ) )
return false;
}
return true;
}
void QgsPointDisplacementRenderer::setCenterSymbol( QgsMarkerSymbol *symbol )
{
mCenterSymbol.reset( symbol );
}
void QgsPointDisplacementRenderer::calculateSymbolAndLabelPositions( QgsSymbolRenderContext &symbolContext, QPointF centerPoint, int nPosition,
double symbolDiagonal, QList<QPointF> &symbolPositions, QList<QPointF> &labelShifts, double &circleRadius, double &gridRadius,
int &gridSize, QVector<double> &diagonals ) const
{
symbolPositions.clear();
labelShifts.clear();
if ( nPosition < 1 )
{
return;
}
else if ( nPosition == 1 ) //If there is only one feature, draw it exactly at the center position
{
const double side = std::sqrt( std::pow( symbolDiagonal, 2 ) / 2.0 );
symbolPositions.append( centerPoint );
labelShifts.append( QPointF( side * mLabelDistanceFactor, -side * mLabelDistanceFactor ) );
return;
}
double circleAdditionPainterUnits = symbolContext.renderContext().convertToPainterUnits( mCircleRadiusAddition, QgsUnitTypes::RenderMillimeters );
switch ( mPlacement )
{
case Ring:
{
const double minDiameterToFitSymbols = nPosition * symbolDiagonal / ( 2.0 * M_PI );
const double radius = std::max( symbolDiagonal / 2, minDiameterToFitSymbols ) + circleAdditionPainterUnits;
const double angleStep = 2 * M_PI / nPosition;
double currentAngle = 0.0;
for ( int featureIndex = 0; featureIndex < nPosition; currentAngle += angleStep, featureIndex++ )
{
const double sinusCurrentAngle = std::sin( currentAngle );
const double cosinusCurrentAngle = std::cos( currentAngle );
const QPointF positionShift( radius * sinusCurrentAngle, radius * cosinusCurrentAngle );
const QPointF labelShift( ( radius + diagonals.at( featureIndex ) * mLabelDistanceFactor ) * sinusCurrentAngle, ( radius + diagonals.at( featureIndex ) * mLabelDistanceFactor ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
}
circleRadius = radius;
break;
}
case ConcentricRings:
{
double centerDiagonal = mCenterSymbol->size( symbolContext.renderContext() ) * M_SQRT2;
int pointsRemaining = nPosition;
int ringNumber = 1;
double firstRingRadius = centerDiagonal / 2.0 + symbolDiagonal / 2.0;
int featureIndex = 0;
while ( pointsRemaining > 0 )
{
double radiusCurrentRing = std::max( firstRingRadius + ( ringNumber - 1 ) * symbolDiagonal + ringNumber * circleAdditionPainterUnits, 0.0 );
int maxPointsCurrentRing = std::max( std::floor( 2 * M_PI * radiusCurrentRing / symbolDiagonal ), 1.0 );
int actualPointsCurrentRing = std::min( maxPointsCurrentRing, pointsRemaining );
double angleStep = 2 * M_PI / actualPointsCurrentRing;
double currentAngle = 0.0;
for ( int i = 0; i < actualPointsCurrentRing; ++i )
{
double sinusCurrentAngle = std::sin( currentAngle );
double cosinusCurrentAngle = std::cos( currentAngle );
QPointF positionShift( radiusCurrentRing * sinusCurrentAngle, radiusCurrentRing * cosinusCurrentAngle );
QPointF labelShift( ( radiusCurrentRing + diagonals.at( featureIndex ) * mLabelDistanceFactor ) * sinusCurrentAngle, ( radiusCurrentRing + diagonals.at( featureIndex ) * mLabelDistanceFactor ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
currentAngle += angleStep;
featureIndex++;
}
pointsRemaining -= actualPointsCurrentRing;
ringNumber++;
circleRadius = radiusCurrentRing;
}
break;
}
case Grid:
{
double centerDiagonal = mCenterSymbol->size( symbolContext.renderContext() ) * M_SQRT2;
int pointsRemaining = nPosition;
gridSize = std::ceil( std::sqrt( pointsRemaining ) );
if ( pointsRemaining - std::pow( gridSize - 1, 2 ) < gridSize )
gridSize -= 1;
double originalPointRadius = ( ( centerDiagonal / 2.0 + symbolDiagonal / 2.0 ) + symbolDiagonal ) / 2;
double userPointRadius = originalPointRadius + circleAdditionPainterUnits;
int yIndex = 0;
while ( pointsRemaining > 0 )
{
for ( int xIndex = 0; xIndex < gridSize && pointsRemaining > 0; ++xIndex )
{
QPointF positionShift( userPointRadius * xIndex, userPointRadius * yIndex );
symbolPositions.append( centerPoint + positionShift );
pointsRemaining--;
}
yIndex++;
}
centralizeGrid( symbolPositions, userPointRadius, gridSize );
int xFactor;
int yFactor;
double side = 0;
for ( int symbolIndex = 0; symbolIndex < symbolPositions.size(); ++symbolIndex )
{
if ( symbolPositions.at( symbolIndex ).x() < centerPoint.x() )
{
xFactor = -1;
}
else
{
xFactor = 1;
}
if ( symbolPositions.at( symbolIndex ).y() < centerPoint.y() )
{
yFactor = 1;
}
else
{
yFactor = -1;
}
side = std::sqrt( std::pow( diagonals.at( symbolIndex ), 2 ) / 2.0 );
QPointF labelShift( ( side * mLabelDistanceFactor * xFactor ), ( -side * mLabelDistanceFactor * yFactor ) );
labelShifts.append( symbolPositions.at( symbolIndex ) - centerPoint + labelShift );
}
gridRadius = userPointRadius;
break;
}
}
}
void QgsPointDisplacementRenderer::centralizeGrid( QList<QPointF> &pointSymbolPositions, double radius, int size ) const
{
double shiftAmount = -radius * ( size - 1.0 ) / 2.0;
QPointF centralShift( shiftAmount, shiftAmount );
for ( int i = 0; i < pointSymbolPositions.size(); ++i )
{
pointSymbolPositions[i] += centralShift;
}
}
void QgsPointDisplacementRenderer::drawGrid( int gridSizeUnits, QgsSymbolRenderContext &context,
QList<QPointF> pointSymbolPositions, int nSymbols )
{
QPainter *p = context.renderContext().painter();
if ( nSymbols < 2 || !p ) //draw grid only if multiple features
{
return;
}
QPen gridPen( mCircleColor );
gridPen.setWidthF( context.renderContext().convertToPainterUnits( mCircleWidth, QgsUnitTypes::RenderMillimeters ) );
p->setPen( gridPen );
for ( int i = 0; i < pointSymbolPositions.size(); ++i )
{
if ( i + 1 < pointSymbolPositions.size() && 0 != ( i + 1 ) % gridSizeUnits )
{
QLineF gridLineRow( pointSymbolPositions[i], pointSymbolPositions[i + 1] );
p->drawLine( gridLineRow );
}
if ( i + gridSizeUnits < pointSymbolPositions.size() )
{
QLineF gridLineColumn( pointSymbolPositions[i], pointSymbolPositions[i + gridSizeUnits] );
p->drawLine( gridLineColumn );
}
}
}
void QgsPointDisplacementRenderer::drawCircle( double radiusPainterUnits, QgsSymbolRenderContext &context, QPointF centerPoint, int nSymbols )
{
QPainter *p = context.renderContext().painter();
if ( nSymbols < 2 || !p ) //draw circle only if multiple features
{
return;
}
//draw Circle
QPen circlePen( mCircleColor );
circlePen.setWidthF( context.renderContext().convertToPainterUnits( mCircleWidth, QgsUnitTypes::RenderMillimeters ) );
p->setPen( circlePen );
p->drawArc( QRectF( centerPoint.x() - radiusPainterUnits, centerPoint.y() - radiusPainterUnits, 2 * radiusPainterUnits, 2 * radiusPainterUnits ), 0, 5760 );
}
void QgsPointDisplacementRenderer::drawSymbols( const ClusteredGroup &group, QgsRenderContext &context, const QList<QPointF> &symbolPositions )
{
QList<QPointF>::const_iterator symbolPosIt = symbolPositions.constBegin();
ClusteredGroup::const_iterator groupIt = group.constBegin();
for ( ; symbolPosIt != symbolPositions.constEnd() && groupIt != group.constEnd();
++symbolPosIt, ++groupIt )
{
context.expressionContext().setFeature( groupIt->feature );
groupIt->symbol()->startRender( context );
groupIt->symbol()->renderPoint( *symbolPosIt, &( groupIt->feature ), context, -1, groupIt->isSelected );
if ( context.hasRenderedFeatureHandlers() )
{
const QgsGeometry bounds( QgsGeometry::fromRect( QgsRectangle( groupIt->symbol()->bounds( *symbolPosIt, context, groupIt->feature ) ) ) );
const QList< QgsRenderedFeatureHandlerInterface * > handlers = context.renderedFeatureHandlers();
QgsRenderedFeatureHandlerInterface::RenderedFeatureContext featureContext( context );
for ( QgsRenderedFeatureHandlerInterface *handler : handlers )
handler->handleRenderedFeature( groupIt->feature, bounds, featureContext );
}
groupIt->symbol()->stopRender( context );
}
}
QgsPointDisplacementRenderer *QgsPointDisplacementRenderer::convertFromRenderer( const QgsFeatureRenderer *renderer )
{
if ( renderer->type() == QLatin1String( "pointDisplacement" ) )
{
return dynamic_cast<QgsPointDisplacementRenderer *>( renderer->clone() );
}
else if ( renderer->type() == QLatin1String( "singleSymbol" ) ||
renderer->type() == QLatin1String( "categorizedSymbol" ) ||
renderer->type() == QLatin1String( "graduatedSymbol" ) ||
renderer->type() == QLatin1String( "RuleRenderer" ) )
{
QgsPointDisplacementRenderer *pointRenderer = new QgsPointDisplacementRenderer();
pointRenderer->setEmbeddedRenderer( renderer->clone() );
return pointRenderer;
}
else if ( renderer->type() == QLatin1String( "pointCluster" ) )
{
QgsPointDisplacementRenderer *pointRenderer = new QgsPointDisplacementRenderer();
const QgsPointClusterRenderer *clusterRenderer = static_cast< const QgsPointClusterRenderer * >( renderer );
if ( clusterRenderer->embeddedRenderer() )
pointRenderer->setEmbeddedRenderer( clusterRenderer->embeddedRenderer()->clone() );
pointRenderer->setTolerance( clusterRenderer->tolerance() );
pointRenderer->setToleranceUnit( clusterRenderer->toleranceUnit() );
pointRenderer->setToleranceMapUnitScale( clusterRenderer->toleranceMapUnitScale() );
if ( const_cast< QgsPointClusterRenderer * >( clusterRenderer )->clusterSymbol() )
pointRenderer->setCenterSymbol( const_cast< QgsPointClusterRenderer * >( clusterRenderer )->clusterSymbol()->clone() );
return pointRenderer;
}
else
{
return nullptr;
}
}