void QgsHistogramDiagram::renderDiagram( const QgsFeature& feature, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position )
{
QPainter* p = c.painter();
if ( !p )
{
return;
}
QList<double> values;
double maxValue = 0;
QgsExpressionContext expressionContext = c.expressionContext();
expressionContext.setFeature( feature );
if ( !feature.fields().isEmpty() )
expressionContext.setFields( feature.fields() );
Q_FOREACH ( const QString& cat, s.categoryAttributes )
{
QgsExpression* expression = getExpression( cat, expressionContext );
double currentVal = expression->evaluate( &expressionContext ).toDouble();
values.push_back( currentVal );
maxValue = qMax( currentVal, maxValue );
}
double scaledMaxVal = sizePainterUnits( maxValue * mScaleFactor, s, c );
double currentOffset = 0;
double scaledWidth = sizePainterUnits( s.barWidth, s, c );
double baseX = position.x();
double baseY = position.y();
mPen.setColor( s.penColor );
setPenWidth( mPen, s, c );
p->setPen( mPen );
QList<double>::const_iterator valIt = values.constBegin();
QList< QColor >::const_iterator colIt = s.categoryColors.constBegin();
for ( ; valIt != values.constEnd(); ++valIt, ++colIt )
{
double length = sizePainterUnits( *valIt * mScaleFactor, s, c );
mCategoryBrush.setColor( *colIt );
p->setBrush( mCategoryBrush );
switch ( s.diagramOrientation )
{
case QgsDiagramSettings::Up:
p->drawRect( baseX + currentOffset, baseY, scaledWidth, length * -1 );
break;
case QgsDiagramSettings::Down:
p->drawRect( baseX + currentOffset, baseY - scaledMaxVal, scaledWidth, length );
break;
case QgsDiagramSettings::Right:
p->drawRect( baseX, baseY - currentOffset, length, scaledWidth * -1 );
break;
case QgsDiagramSettings::Left:
p->drawRect( baseX + scaledMaxVal, baseY - currentOffset, 0 - length, scaledWidth * -1 );
break;
}
currentOffset += scaledWidth;
}
}
void QgsPieDiagram::renderDiagram( const QgsAttributeMap& att, QgsRenderContext& c, const QgsDiagramSettings& s, const QPointF& position )
{
QPainter* p = c.painter();
if ( !p )
{
return;
}
//get sum of values
QList<double> values;
double currentVal = 0;
double valSum = 0;
int valCount = 0;
QList<int>::const_iterator catIt = s.categoryIndices.constBegin();
for ( ; catIt != s.categoryIndices.constEnd(); ++catIt )
{
currentVal = att[*catIt].toDouble();
values.push_back( currentVal );
valSum += currentVal;
if ( currentVal ) valCount++;
}
//draw the slices
double totalAngle = 0;
double currentAngle;
//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;
mPen.setColor( s.penColor );
setPenWidth( mPen, s, c );
p->setPen( mPen );
// there are some values > 0 available
if ( valSum > 0 )
{
QList<double>::const_iterator valIt = values.constBegin();
QList< QColor >::const_iterator colIt = s.categoryColors.constBegin();
for ( ; valIt != values.constEnd(); ++valIt, ++colIt )
{
currentAngle = *valIt / valSum * 360 * 16;
mCategoryBrush.setColor( *colIt );
p->setBrush( mCategoryBrush );
// if only 1 value is > 0, draw a circle
if ( valCount == 1 )
{
p->drawEllipse( baseX, baseY, w, h );
}
else
{
p->drawPie( baseX, baseY, w, h, totalAngle, currentAngle );
}
totalAngle += currentAngle;
}
}
else // valSum > 0
{
// draw empty circle if no values are defined at all
mCategoryBrush.setColor( Qt::transparent );
p->setBrush( mCategoryBrush );
p->drawEllipse( baseX, baseY, w, h );
}
}
void QgsTextDiagram::renderDiagram( const QgsFeature& feature, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position )
{
QPainter* p = c.painter();
if ( !p )
{
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;
QVector<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 );
QgsExpressionContext expressionContext = c.expressionContext();
expressionContext.setFeature( feature );
if ( feature.fields() )
expressionContext.setFields( *feature.fields() );
for ( int i = 0; i < textPositions.size(); ++i )
{
QgsExpression* expression = getExpression( s.categoryAttributes.at( i ), expressionContext );
QString val = expression->evaluate( &expressionContext ).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 );
}
}
