QSizeF QgsTextDiagram::diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is )
{
QgsExpressionContext expressionContext = c.expressionContext();
expressionContext.setFeature( feature );
if ( feature.fields() )
expressionContext.setFields( *feature.fields() );
QVariant attrVal;
if ( is.classificationAttributeIsExpression )
{
QgsExpression* expression = getExpression( is.classificationAttributeExpression, expressionContext );
attrVal = expression->evaluate( &expressionContext );
}
else
{
attrVal = feature.attributes().at( is.classificationAttribute );
}
bool ok = false;
double val = attrVal.toDouble( &ok );
if ( !ok )
{
return QSizeF(); //zero size if attribute is missing
}
return sizeForValue( val, s, is );
}
QSizeF QgsHistogramDiagram::diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is )
{
QSizeF size;
if ( feature.attributes().isEmpty() )
{
return size; //zero size if no attributes
}
if ( qgsDoubleNear( is.upperValue, is.lowerValue ) )
return size; // invalid value range => zero size
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 );
maxValue = qMax( expression->evaluate( &expressionContext ).toDouble(), maxValue );
}
// Scale, if extension is smaller than the specified minimum
if ( maxValue < s.minimumSize )
{
maxValue = s.minimumSize;
}
switch ( s.diagramOrientation )
{
case QgsDiagramSettings::Up:
case QgsDiagramSettings::Down:
mScaleFactor = (( is.upperSize.width() - is.lowerSize.height() ) / ( is.upperValue - is.lowerValue ) );
size.scale( s.barWidth * s.categoryAttributes.size(), maxValue * mScaleFactor, Qt::IgnoreAspectRatio );
break;
case QgsDiagramSettings::Right:
case QgsDiagramSettings::Left:
mScaleFactor = (( is.upperSize.width() - is.lowerSize.width() ) / ( is.upperValue - is.lowerValue ) );
size.scale( maxValue * mScaleFactor, s.barWidth * s.categoryAttributes.size(), Qt::IgnoreAspectRatio );
break;
}
return size;
}
void QgsEditorWidgetWrapper::updateConstraint( const QgsFeature &ft )
{
bool toEmit( false );
QString errStr( tr( "predicate is True" ) );
QString expression = layer()->editFormConfig().constraintExpression( mFieldIdx );
QString description;
QVariant value = ft.attribute( mFieldIdx );
if ( ! expression.isEmpty() )
{
description = layer()->editFormConfig().constraintDescription( mFieldIdx );
QgsExpressionContext context = layer()->createExpressionContext();
context.setFeature( ft );
QgsExpression expr( expression );
mValidConstraint = expr.evaluate( &context ).toBool();
if ( expr.hasParserError() )
errStr = expr.parserErrorString();
else if ( expr.hasEvalError() )
errStr = expr.evalErrorString();
else if ( ! mValidConstraint )
errStr = tr( "predicate is False" );
toEmit = true;
}
else
mValidConstraint = true;
if ( layer()->editFormConfig().notNull( mFieldIdx ) )
{
if ( !expression.isEmpty() )
{
QString fieldName = ft.fields().field( mFieldIdx ).name();
expression = "( " + expression + " ) AND ( " + fieldName + " IS NOT NULL)";
description = "( " + description + " ) AND NotNull";
}
else
{
description = QStringLiteral( "NotNull" );
expression = QStringLiteral( "NotNull" );
}
mValidConstraint = mValidConstraint && !value.isNull();
if ( value.isNull() )
errStr = tr( "predicate is False" );
toEmit = true;
}
if ( toEmit )
{
updateConstraintWidgetStatus( mValidConstraint );
emit constraintStatusChanged( expression, description, errStr, mValidConstraint );
}
}
void QgsActionManager::doAction( const QUuid& actionId, const QgsFeature& feature, int defaultValueIndex )
{
QgsExpressionContext context = createExpressionContext();
QgsExpressionContextScope* actionScope = new QgsExpressionContextScope();
actionScope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "field_index" ), defaultValueIndex, true ) );
if ( defaultValueIndex >= 0 && defaultValueIndex < feature.fields().size() )
actionScope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "field_name" ), feature.fields().at( defaultValueIndex ).name(), true ) );
actionScope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "field_value" ), feature.attribute( defaultValueIndex ), true ) );
context << actionScope;
doAction( actionId, feature, context );
}
QSizeF QgsTextDiagram::diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is )
{
Q_UNUSED( c );
QVariant attrVal;
if ( is.classificationAttributeIsExpression )
{
QgsExpression* expression = getExpression( is.classificationAttributeExpression, feature.fields() );
attrVal = expression->evaluate( feature );
}
else
{
attrVal = feature.attributes()[is.classificationAttribute];
}
if ( !attrVal.isValid() )
{
return QSizeF(); //zero size if attribute is missing
}
double scaledValue = attrVal.toDouble();
double scaledLowerValue = is.lowerValue;
double scaledUpperValue = is.upperValue;
double scaledLowerSizeWidth = is.lowerSize.width();
double scaledLowerSizeHeight = is.lowerSize.height();
double scaledUpperSizeWidth = is.upperSize.width();
double scaledUpperSizeHeight = is.upperSize.height();
// interpolate the squared value if scale by area
if ( s.scaleByArea )
{
scaledValue = sqrt( scaledValue );
scaledLowerValue = sqrt( scaledLowerValue );
scaledUpperValue = sqrt( scaledUpperValue );
scaledLowerSizeWidth = sqrt( scaledLowerSizeWidth );
scaledLowerSizeHeight = sqrt( scaledLowerSizeHeight );
scaledUpperSizeWidth = sqrt( scaledUpperSizeWidth );
scaledUpperSizeHeight = sqrt( scaledUpperSizeHeight );
}
//interpolate size
double scaledRatio = ( scaledValue - scaledLowerValue ) / ( scaledUpperValue - scaledLowerValue );
QSizeF size = QSizeF( is.upperSize.width() * scaledRatio + is.lowerSize.width() * ( 1 - scaledRatio ),
is.upperSize.height() * scaledRatio + is.lowerSize.height() * ( 1 - scaledRatio ) );
// Scale, if extension is smaller than the specified minimum
if ( size.width() <= s.minimumSize && size.height() <= s.minimumSize )
{
size.scale( s.minimumSize, s.minimumSize, Qt::KeepAspectRatio );
}
return size;
}
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 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 );
}
}
void QgsPieDiagram::renderDiagram( const QgsFeature& feature, 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<QString>::const_iterator catIt = s.categoryAttributes.constBegin();
for ( ; catIt != s.categoryAttributes.constEnd(); ++catIt )
{
QgsExpression* expression = getExpression( *catIt, feature.fields() );
currentVal = expression->evaluate( feature ).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 )
{
if ( *valIt )
{
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 + s.angleOffset, 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 );
}
}