bool QgsPointDisplacementRenderer::renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer, bool selected, bool drawVertexMarker )
{
Q_UNUSED( drawVertexMarker );
Q_UNUSED( context );
Q_UNUSED( layer );
//check, if there is already a point at that position
if ( !feature.constGeometry() )
return false;
QgsSymbolV2* symbol = firstSymbolForFeature( mRenderer, feature, context );
//if the feature has no symbol (eg, no matching rule in a rule-based renderer), skip it
if ( !symbol )
return false;
//point position in screen coords
const QgsGeometry* geom = feature.constGeometry();
QGis::WkbType geomType = geom->wkbType();
if ( geomType != QGis::WKBPoint && geomType != QGis::WKBPoint25D )
{
//can only render point type
return false;
}
if ( selected )
mSelectedFeatures.insert( feature.id() );
double searchDistance = mTolerance * QgsSymbolLayerV2Utils::mapUnitScaleFactor( context, mToleranceUnit, mToleranceMapUnitScale );
QList<QgsFeatureId> intersectList = mSpatialIndex->intersects( searchRect( feature.constGeometry()->asPoint(), searchDistance ) );
if ( intersectList.empty() )
{
mSpatialIndex->insertFeature( feature );
// create new group
DisplacementGroup newGroup;
newGroup.insert( feature.id(), qMakePair( feature, symbol ) );
mDisplacementGroups.push_back( newGroup );
// add to group index
mGroupIndex.insert( feature.id(), mDisplacementGroups.count() - 1 );
return true;
}
//go through all the displacement group maps and search an entry where the id equals the result of the spatial search
QgsFeatureId existingEntry = intersectList.at( 0 );
int groupIdx = mGroupIndex[ existingEntry ];
DisplacementGroup& group = mDisplacementGroups[groupIdx];
// add to a group
group.insert( feature.id(), qMakePair( feature, symbol ) );
// add to group index
mGroupIndex.insert( feature.id(), groupIdx );
return true;
}
bool QgsPointDisplacementRenderer::renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer, bool selected, bool drawVertexMarker )
{
Q_UNUSED( drawVertexMarker );
//point position in screen coords
QgsGeometry* geom = feature.geometry();
QGis::WkbType geomType = geom->wkbType();
if ( geomType != QGis::WKBPoint && geomType != QGis::WKBPoint25D )
{
//can only render point type
return false;
}
QPointF pt;
_getPoint( pt, context, geom->asWkb() );
//get list of labels and symbols
QStringList labelAttributeList;
QList<QgsMarkerSymbolV2*> symbolList;
if ( mDisplacementIds.contains( feature.id() ) )
{
//create the symbol for the whole display group if the id is the first entry in a display group
QList<QMap<QgsFeatureId, QgsFeature> >::iterator it = mDisplacementGroups.begin();
for ( ; it != mDisplacementGroups.end(); ++it )
{
//create the symbol for the whole display group if the id is the first entry in a display group
if ( feature.id() == it->begin().key() )
{
QMap<QgsFeatureId, QgsFeature>::iterator attIt = it->begin();
for ( ; attIt != it->end(); ++attIt )
{
if ( mDrawLabels )
{
labelAttributeList << getLabel( attIt.value() );
}
else
{
labelAttributeList << QString();
}
symbolList << dynamic_cast<QgsMarkerSymbolV2*>( firstSymbolForFeature( mRenderer, attIt.value() ) );
}
}
}
}
else //only one feature
{
symbolList << dynamic_cast<QgsMarkerSymbolV2*>( firstSymbolForFeature( mRenderer, feature ) );
if ( mDrawLabels )
{
labelAttributeList << getLabel( feature );
}
else
{
labelAttributeList << QString();
}
}
if ( symbolList.isEmpty() && labelAttributeList.isEmpty() )
{
return true; //display all point symbols for one posi
}
//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() );
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, layer, 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 );
return true;
}
bool QgsPointDistanceRenderer::renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer, bool selected, bool drawVertexMarker )
{
Q_UNUSED( drawVertexMarker );
Q_UNUSED( context );
Q_UNUSED( layer );
//check if there is already a point at that position
if ( !feature.hasGeometry() )
return false;
QgsMarkerSymbol* symbol = firstSymbolForFeature( feature, context );
//if the feature has no symbol (eg, no matching rule in a rule-based renderer), skip it
if ( !symbol )
return false;
//point position in screen coords
QgsGeometry geom = feature.geometry();
QgsWkbTypes::Type geomType = geom.wkbType();
if ( QgsWkbTypes::flatType( geomType ) != QgsWkbTypes::Point )
{
//can only render point type
return false;
}
QString label;
if ( mDrawLabels )
{
label = getLabel( feature );
}
QgsCoordinateTransform xform = context.coordinateTransform();
QgsFeature transformedFeature = feature;
if ( xform.isValid() )
{
geom.transform( xform );
transformedFeature.setGeometry( geom );
}
double searchDistance = mTolerance * QgsSymbolLayerUtils::mapUnitScaleFactor( context, mToleranceUnit, mToleranceMapUnitScale );
QgsPoint point = transformedFeature.geometry().asPoint();
QList<QgsFeatureId> intersectList = mSpatialIndex->intersects( searchRect( point, searchDistance ) );
if ( intersectList.empty() )
{
mSpatialIndex->insertFeature( transformedFeature );
// create new group
ClusteredGroup newGroup;
newGroup << GroupedFeature( transformedFeature, symbol, selected, label );
mClusteredGroups.push_back( newGroup );
// add to group index
mGroupIndex.insert( transformedFeature.id(), mClusteredGroups.count() - 1 );
mGroupLocations.insert( transformedFeature.id(), point );
}
else
{
// find group with closest location to this point (may be more than one within search tolerance)
QgsFeatureId minDistFeatureId = intersectList.at( 0 );
double minDist = mGroupLocations.value( minDistFeatureId ).distance( point );
for ( int i = 1; i < intersectList.count(); ++i )
{
QgsFeatureId candidateId = intersectList.at( i );
double newDist = mGroupLocations.value( candidateId ).distance( point );
if ( newDist < minDist )
{
minDist = newDist;
minDistFeatureId = candidateId;
}
}
int groupIdx = mGroupIndex[ minDistFeatureId ];
ClusteredGroup& group = mClusteredGroups[groupIdx];
// calculate new centroid of group
QgsPoint oldCenter = mGroupLocations.value( minDistFeatureId );
mGroupLocations[ minDistFeatureId ] = QgsPoint(( oldCenter.x() * group.size() + point.x() ) / ( group.size() + 1.0 ),
( oldCenter.y() * group.size() + point.y() ) / ( group.size() + 1.0 ) );
// add to a group
group << GroupedFeature( transformedFeature, symbol, selected, label );
// add to group index
mGroupIndex.insert( transformedFeature.id(), groupIdx );
}
return true;
}
void QgsPointDisplacementRenderer::drawGroup( const DisplacementGroup& group, QgsRenderContext& context )
{
const QgsFeature& feature = group.begin().value();
bool selected = mSelectedFeatures.contains( feature.id() ); // maybe we should highlight individual features instead of the whole group?
QPointF pt;
_getPoint( pt, context, feature.geometry()->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() ) : QString() );
QgsFeature& f = const_cast<QgsFeature&>( attIt.value() ); // other parts of API use non-const ref to QgsFeature :-/
symbolList << dynamic_cast<QgsMarkerSymbolV2*>( firstSymbolForFeature( mRenderer, f ) );
}
//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 );
}
