void QgsPointDisplacementRenderer::drawGroup( const DisplacementGroup& group, QgsRenderContext& context )
{
const QgsFeature& feature = group.begin().value().first;
bool selected = mSelectedFeatures.contains( feature.id() ); // maybe we should highlight individual features instead of the whole group?
//get list of labels and symbols
QStringList labelAttributeList;
QList<QgsMarkerSymbolV2*> symbolList;
QgsMultiPointV2* groupMultiPoint = new QgsMultiPointV2();
for ( DisplacementGroup::const_iterator attIt = group.constBegin(); attIt != group.constEnd(); ++attIt )
{
labelAttributeList << ( mDrawLabels ? getLabel( attIt.value().first ) : QString() );
symbolList << dynamic_cast<QgsMarkerSymbolV2*>( attIt.value().second );
groupMultiPoint->addGeometry( attIt.value().first.constGeometry()->geometry()->clone() );
}
//calculate centroid of all points, this will be center of group
QgsGeometry groupGeom( groupMultiPoint );
QgsGeometry* centroid = groupGeom.centroid();
QPointF pt;
_getPoint( pt, context, centroid->asWkb() );
delete centroid;
//calculate max diagonal size from all symbols in group
double diagonal = 0;
Q_FOREACH ( QgsMarkerSymbolV2* symbol, symbolList )
{
if ( symbol )
{
diagonal = qMax( diagonal, QgsSymbolLayerV2Utils::convertToPainterUnits( context,
M_SQRT2 * symbol->size(),
symbol->outputUnit(), symbol->mapUnitScale() ) );
}
}
QgsSymbolV2RenderContext symbolContext( context, QgsSymbolV2::MM, 1.0, selected );
QList<QPointF> symbolPositions;
QList<QPointF> labelPositions;
double circleRadius = -1.0;
calculateSymbolAndLabelPositions( symbolContext, pt, symbolList.size(), diagonal, symbolPositions, labelPositions, circleRadius );
//draw Circle
if ( circleRadius > 0 )
drawCircle( circleRadius, symbolContext, pt, symbolList.size() );
//draw mid point
if ( labelAttributeList.size() > 1 )
{
if ( mCenterSymbol )
{
mCenterSymbol->renderPoint( pt, &feature, context, -1, selected );
}
else
{
context.painter()->drawRect( QRectF( pt.x() - symbolContext.outputLineWidth( 1 ), pt.y() - symbolContext.outputLineWidth( 1 ), symbolContext.outputLineWidth( 2 ), symbolContext.outputLineWidth( 2 ) ) );
}
}
//draw symbols on the circle
drawSymbols( feature, context, symbolList, symbolPositions, selected );
//and also the labels
drawLabels( pt, symbolContext, labelPositions, labelAttributeList );
}
void QgsPointDisplacementRenderer::drawGroup( const DisplacementGroup& group, QgsRenderContext& context )
{
const QgsFeature& feature = group.begin().value().first;
bool selected = mSelectedFeatures.contains( feature.id() ); // maybe we should highlight individual features instead of the whole group?
QPointF pt;
_getPoint( pt, context, feature.constGeometry()->asWkb() );
//get list of labels and symbols
QStringList labelAttributeList;
QList<QgsMarkerSymbolV2*> symbolList;
for ( DisplacementGroup::const_iterator attIt = group.constBegin(); attIt != group.constEnd(); ++attIt )
{
labelAttributeList << ( mDrawLabels ? getLabel( attIt.value().first ) : QString() );
symbolList << dynamic_cast<QgsMarkerSymbolV2*>( attIt.value().second );
}
//draw symbol
double diagonal = 0;
double currentWidthFactor; //scale symbol size to map unit and output resolution
QList<QgsMarkerSymbolV2*>::const_iterator it = symbolList.constBegin();
for ( ; it != symbolList.constEnd(); ++it )
{
if ( *it )
{
currentWidthFactor = QgsSymbolLayerV2Utils::lineWidthScaleFactor( context, ( *it )->outputUnit(), ( *it )->mapUnitScale() );
double currentDiagonal = sqrt( 2 * (( *it )->size() * ( *it )->size() ) ) * currentWidthFactor;
if ( currentDiagonal > diagonal )
{
diagonal = currentDiagonal;
}
}
}
QgsSymbolV2RenderContext symbolContext( context, QgsSymbolV2::MM, 1.0, selected );
double circleAdditionPainterUnits = symbolContext.outputLineWidth( mCircleRadiusAddition );
double radius = qMax(( diagonal / 2 ), labelAttributeList.size() * diagonal / 2 / M_PI ) + circleAdditionPainterUnits;
//draw Circle
drawCircle( radius, symbolContext, pt, symbolList.size() );
QList<QPointF> symbolPositions;
QList<QPointF> labelPositions;
calculateSymbolAndLabelPositions( pt, labelAttributeList.size(), radius, diagonal, symbolPositions, labelPositions );
//draw mid point
if ( labelAttributeList.size() > 1 )
{
if ( mCenterSymbol )
{
mCenterSymbol->renderPoint( pt, &feature, context, -1, selected );
}
else
{
context.painter()->drawRect( QRectF( pt.x() - symbolContext.outputLineWidth( 1 ), pt.y() - symbolContext.outputLineWidth( 1 ), symbolContext.outputLineWidth( 2 ), symbolContext.outputLineWidth( 2 ) ) );
}
}
//draw symbols on the circle
drawSymbols( feature, context, symbolList, symbolPositions, selected );
//and also the labels
drawLabels( pt, symbolContext, labelPositions, labelAttributeList );
}