void QgsPointDisplacementRenderer::startRender( QgsRenderContext& context, const QgsVectorLayer *vlayer )
{
mRenderer->startRender( context, vlayer );
//create groups with features that have the same position
createDisplacementGroups( const_cast<QgsVectorLayer*>( vlayer ), context.extent() );
printInfoDisplacementGroups(); //just for debugging
if ( mLabelAttributeName.isEmpty() )
{
mLabelIndex = -1;
}
else
{
mLabelIndex = vlayer->fieldNameIndex( mLabelAttributeName );
}
if ( mMaxLabelScaleDenominator > 0 && context.rendererScale() > mMaxLabelScaleDenominator )
{
mDrawLabels = false;
}
else
{
mDrawLabels = true;
}
if ( mCenterSymbol )
{
mCenterSymbol->startRender( context, vlayer );
}
}
void QgsCategorizedSymbolRendererV2::startRender( QgsRenderContext& context, const QgsFields& fields )
{
mCounting = context.rendererScale() == 0.0;
// make sure that the hash table is up to date
rebuildHash();
// find out classification attribute index from name
mAttrNum = fields.fieldNameIndex( mAttrName );
if ( mAttrNum == -1 )
{
mExpression.reset( new QgsExpression( mAttrName ) );
mExpression->prepare( fields );
}
QgsCategoryList::iterator it = mCategories.begin();
for ( ; it != mCategories.end(); ++it )
{
it->symbol()->startRender( context, &fields );
if ( mRotation.data() || mSizeScale.data() )
{
QgsSymbolV2* tempSymbol = it->symbol()->clone();
tempSymbol->setRenderHints(( mRotation.data() ? QgsSymbolV2::DataDefinedRotation : 0 ) |
( mSizeScale.data() ? QgsSymbolV2::DataDefinedSizeScale : 0 ) );
tempSymbol->startRender( context, &fields );
mTempSymbols[ it->symbol()] = tempSymbol;
}
}
}
void QgsPointDisplacementRenderer::startRender( QgsRenderContext& context, const QgsFields& fields )
{
mRenderer->startRender( context, fields );
mDisplacementGroups.clear();
mGroupIndex.clear();
mSpatialIndex = new QgsSpatialIndex;
mSelectedFeatures.clear();
if ( mLabelAttributeName.isEmpty() )
{
mLabelIndex = -1;
}
else
{
mLabelIndex = fields.fieldNameIndex( mLabelAttributeName );
}
if ( mMaxLabelScaleDenominator > 0 && context.rendererScale() > mMaxLabelScaleDenominator )
{
mDrawLabels = false;
}
else
{
mDrawLabels = true;
}
if ( mCenterSymbol )
{
mCenterSymbol->startRender( context, &fields );
}
return;
}
void QgsGraduatedSymbolRendererV2::startRender( QgsRenderContext& context, const QgsFields& fields )
{
mCounting = context.rendererScale() == 0.0;
// find out classification attribute index from name
mAttrNum = fields.fieldNameIndex( mAttrName );
if ( mAttrNum == -1 )
{
mExpression.reset( new QgsExpression( mAttrName ) );
mExpression->prepare( &context.expressionContext() );
}
QgsRangeList::iterator it = mRanges.begin();
for ( ; it != mRanges.end(); ++it )
{
if ( !it->symbol() )
continue;
it->symbol()->startRender( context, &fields );
if ( mRotation.data() || mSizeScale.data() )
{
QgsSymbolV2* tempSymbol = it->symbol()->clone();
tempSymbol->setRenderHints(( mRotation.data() ? QgsSymbolV2::DataDefinedRotation : 0 ) |
( mSizeScale.data() ? QgsSymbolV2::DataDefinedSizeScale : 0 ) );
tempSymbol->startRender( context, &fields );
mTempSymbols[ it->symbol()] = tempSymbol;
}
}
return;
}
void QgsCategorizedSymbolRendererV2::startRender( QgsRenderContext& context, const QgsFields& fields )
{
mCounting = context.rendererScale() == 0.0;
// make sure that the hash table is up to date
rebuildHash();
// find out classification attribute index from name
mAttrNum = fields.fieldNameIndex( mAttrName );
if ( mAttrNum == -1 )
{
mExpression.reset( new QgsExpression( mAttrName ) );
mExpression->prepare( &context.expressionContext() );
}
Q_FOREACH ( const QgsRendererCategoryV2& cat, mCategories )
{
cat.symbol()->startRender( context, &fields );
if ( mRotation.data() || mSizeScale.data() )
{
QgsSymbolV2* tempSymbol = cat.symbol()->clone();
tempSymbol->setRenderHints(( mRotation.data() ? QgsSymbolV2::DataDefinedRotation : 0 ) |
( mSizeScale.data() ? QgsSymbolV2::DataDefinedSizeScale : 0 ) );
tempSymbol->startRender( context, &fields );
mTempSymbols[ cat.symbol()] = tempSymbol;
}
}
void QgsGraduatedSymbolRenderer::startRender( QgsRenderContext &context, const QgsFields &fields )
{
mCounting = context.rendererScale() == 0.0;
// find out classification attribute index from name
mAttrNum = fields.lookupField( mAttrName );
if ( mAttrNum == -1 )
{
mExpression.reset( new QgsExpression( mAttrName ) );
mExpression->prepare( &context.expressionContext() );
}
Q_FOREACH ( const QgsRendererRange &range, mRanges )
{
if ( !range.symbol() )
continue;
range.symbol()->startRender( context, fields );
}
}
void QgsRuleBasedRendererV2::startRender( QgsRenderContext& context, const QgsVectorLayer *vlayer )
{
double currentScale = context.rendererScale();
// filter out rules which are not compatible with this scale
mCurrentRules.clear();
for ( QList<Rule>::iterator it = mRules.begin(); it != mRules.end(); ++it )
{
Rule& rule = *it;
if ( rule.isScaleOK( currentScale ) )
mCurrentRules.append( &rule );
}
QgsFieldMap pendingFields = vlayer->pendingFields();
for ( QList<Rule*>::iterator it = mCurrentRules.begin(); it != mCurrentRules.end(); ++it )
{
Rule* rule = *it;
QgsExpression* exp = rule->filter();
if ( exp )
exp->prepare( pendingFields );
rule->symbol()->startRender( context );
}
}
void QgsTextDiagram::renderDiagram( const QgsFeature& feature, QgsRenderContext& c, const QgsDiagramSettings& s, const QPointF& position )
{
Q_UNUSED( feature );
QPainter* p = c.painter();
if ( !p )
{
return;
}
double scaleDenominator = c.rendererScale();
if (( s.minScaleDenominator != -1 && scaleDenominator < s.minScaleDenominator )
|| ( s.maxScaleDenominator != -1 && scaleDenominator > s.maxScaleDenominator ) )
{
return;
}
//convert from mm / map units to painter units
QSizeF spu = sizePainterUnits( s.size, s, c );
double w = spu.width();
double h = spu.height();
double baseX = position.x();
double baseY = position.y() - h;
QList<QPointF> textPositions; //midpoints for text placement
int nCategories = s.categoryAttributes.size();
for ( int i = 0; i < nCategories; ++i )
{
if ( mOrientation == Horizontal )
{
textPositions.push_back( QPointF( baseX + ( w / nCategories ) * i + w / nCategories / 2.0, baseY + h / 2.0 ) );
}
else //vertical
{
textPositions.push_back( QPointF( baseX + w / 2.0, baseY + h / nCategories * i + w / nCategories / 2.0 ) );
}
}
mPen.setColor( s.penColor );
setPenWidth( mPen, s, c );
p->setPen( mPen );
mBrush.setColor( s.backgroundColor );
p->setBrush( mBrush );
//draw shapes and separator lines first
if ( mShape == Circle )
{
p->drawEllipse( baseX, baseY, w, h );
//draw separator lines
QList<QPointF> intersect; //intersections between shape and separation lines
QPointF center( baseX + w / 2.0, baseY + h / 2.0 );
double r1 = w / 2.0; double r2 = h / 2.0;
for ( int i = 1; i < nCategories; ++i )
{
if ( mOrientation == Horizontal )
{
lineEllipseIntersection( QPointF( baseX + w / nCategories * i, baseY ), QPointF( baseX + w / nCategories * i, baseY + h ), center, r1, r2, intersect );
}
else //vertical
{
lineEllipseIntersection( QPointF( baseX, baseY + h / nCategories * i ), QPointF( baseX + w, baseY + h / nCategories * i ), center, r1, r2, intersect );
}
if ( intersect.size() > 1 )
{
p->drawLine( intersect.at( 0 ), intersect.at( 1 ) );
}
}
}
else if ( mShape == Rectangle )
{
p->drawRect( QRectF( baseX, baseY, w, h ) );
for ( int i = 1; i < nCategories; ++i )
{
if ( mOrientation == Horizontal )
{
p->drawLine( QPointF( baseX + w / nCategories * i, baseY ), QPointF( baseX + w / nCategories * i, baseY + h ) );
}
else
{
p->drawLine( QPointF( baseX, baseY + h / nCategories * i ), QPointF( baseX + w, baseY + h / nCategories * i ) );
}
}
}
else //triangle
{
QPolygonF triangle;
triangle << QPointF( baseX, baseY + h ) << QPointF( baseX + w, baseY + h ) << QPointF( baseX + w / 2.0, baseY );
p->drawPolygon( triangle );
QLineF triangleEdgeLeft( baseX + w / 2.0, baseY, baseX, baseY + h );
QLineF triangleEdgeRight( baseX + w, baseY + h, baseX + w / 2.0, baseY );
QPointF intersectionPoint1, intersectionPoint2;
for ( int i = 1; i < nCategories; ++i )
{
if ( mOrientation == Horizontal )
{
QLineF verticalLine( baseX + w / nCategories * i, baseY + h, baseX + w / nCategories * i, baseY );
if ( baseX + w / nCategories * i < baseX + w / 2.0 )
{
verticalLine.intersect( triangleEdgeLeft, &intersectionPoint1 );
}
else
{
verticalLine.intersect( triangleEdgeRight, &intersectionPoint1 );
}
p->drawLine( QPointF( baseX + w / nCategories * i, baseY + h ), intersectionPoint1 );
}
else //vertical
{
QLineF horizontalLine( baseX, baseY + h / nCategories * i, baseX + w, baseY + h / nCategories * i );
horizontalLine.intersect( triangleEdgeLeft, &intersectionPoint1 );
horizontalLine.intersect( triangleEdgeRight, &intersectionPoint2 );
p->drawLine( intersectionPoint1, intersectionPoint2 );
}
}
}
//draw text
QFont sFont = scaledFont( s, c );
QFontMetricsF fontMetrics( sFont );
p->setFont( sFont );
for ( int i = 0; i < textPositions.size(); ++i )
{
QgsExpression* expression = getExpression( s.categoryAttributes.at( i ), feature.fields() );
QString val = expression->evaluate( feature ).toString();
//find out dimesions
double textWidth = fontMetrics.width( val );
double textHeight = fontMetrics.height();
mPen.setColor( s.categoryColors.at( i ) );
p->setPen( mPen );
QPointF position = textPositions.at( i );
// Calculate vertical placement
double xOffset = 0;
switch ( s.labelPlacementMethod )
{
case QgsDiagramSettings::Height:
xOffset = textHeight / 2.0;
break;
case QgsDiagramSettings::XHeight:
xOffset = fontMetrics.xHeight();
break;
}
p->drawText( QPointF( position.x() - textWidth / 2.0, position.y() + xOffset ), val );
}
}
