void QgsPointDisplacementRenderer::drawGroup( QPointF centerPoint, QgsRenderContext &context, const ClusteredGroup &group )
{
//calculate max diagonal size from all symbols in group
double diagonal = 0;
for ( const GroupedFeature &feature : group )
{
if ( QgsMarkerSymbol *symbol = feature.symbol() )
{
diagonal = std::max( diagonal, M_SQRT2 * symbol->size( context ) );
}
}
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 );
//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
{
context.painter()->drawRect( QRectF( centerPoint.x() - symbolContext.outputLineWidth( 1 ), centerPoint.y() - symbolContext.outputLineWidth( 1 ), symbolContext.outputLineWidth( 2 ), symbolContext.outputLineWidth( 2 ) ) );
}
}
//draw symbols on the circle
drawSymbols( group, context, symbolPositions );
//and also the labels
if ( mLabelIndex >= 0 )
{
drawLabels( centerPoint, symbolContext, labelPositions, group );
}
}
void QgsPointClusterRenderer::drawGroup( QPointF centerPoint, QgsRenderContext& context, const ClusteredGroup& group )
{
if ( group.size() > 1 )
{
mClusterSymbol->renderPoint( centerPoint, &( group.at( 0 ).feature ), context, -1, false );
}
else
{
//single isolated symbol, draw it untouched
QgsMarkerSymbol* symbol = group.at( 0 ).symbol;
symbol->renderPoint( centerPoint, &( group.at( 0 ).feature ), context, -1, group.at( 0 ).isSelected );
}
}
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 );
groupIt->symbol()->stopRender( context );
}
}
void QgsPointDisplacementRenderer::drawGroup( QPointF centerPoint, QgsRenderContext& context, const ClusteredGroup& group )
{
//calculate max diagonal size from all symbols in group
double diagonal = 0;
Q_FOREACH ( const GroupedFeature& feature, group )
{
if ( QgsMarkerSymbol* symbol = feature.symbol )
{
diagonal = qMax( diagonal, context.convertToPainterUnits( M_SQRT2 * symbol->size(),
symbol->sizeUnit(), symbol->sizeMapUnitScale() ) );
}
}
QgsSymbolRenderContext symbolContext( context, QgsUnitTypes::RenderMillimeters, 1.0, false );
QList<QPointF> symbolPositions;
QList<QPointF> labelPositions;
double circleRadius = -1.0;
calculateSymbolAndLabelPositions( symbolContext, centerPoint, group.size(), diagonal, symbolPositions, labelPositions, circleRadius );
//draw circle
if ( circleRadius > 0 )
drawCircle( circleRadius, symbolContext, centerPoint, 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
{
context.painter()->drawRect( QRectF( centerPoint.x() - symbolContext.outputLineWidth( 1 ), centerPoint.y() - symbolContext.outputLineWidth( 1 ), symbolContext.outputLineWidth( 2 ), symbolContext.outputLineWidth( 2 ) ) );
}
}
//draw symbols on the circle
drawSymbols( group, context, symbolPositions );
//and also the labels
if ( mLabelIndex >= 0 )
{
drawLabels( centerPoint, symbolContext, labelPositions, group );
}
}
