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qgsdiagram.cpp
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qgsdiagram.cpp
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/***************************************************************************
qgsdiagram.cpp
---------------------
begin : March 2011
copyright : (C) 2011 by Marco Hugentobler
email : marco dot hugentobler at sourcepole dot ch
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsdiagram.h"
#include "qgsdiagramrendererv2.h"
#include "qgsrendercontext.h"
#include "qgsexpression.h"
#include <QPainter>
QgsDiagram::QgsDiagram()
{
}
QgsDiagram::QgsDiagram( const QgsDiagram& other )
{
Q_UNUSED( other );
// do not copy the cached expression map - the expressions need to be created and prepared with getExpression(...) call
}
void QgsDiagram::clearCache()
{
QMapIterator<QString, QgsExpression*> i( mExpressions );
while ( i.hasNext() )
{
i.next();
delete i.value();
}
mExpressions.clear();
}
QgsExpression* QgsDiagram::getExpression( const QString& expression, const QgsFields* fields )
{
Q_NOWARN_DEPRECATED_PUSH
if ( !mExpressions.contains( expression ) )
{
QgsExpression* expr = new QgsExpression( expression );
expr->prepare( *fields );
mExpressions[expression] = expr;
}
return mExpressions[expression];
Q_NOWARN_DEPRECATED_POP
}
QgsExpression *QgsDiagram::getExpression( const QString &expression, const QgsExpressionContext &context )
{
if ( !mExpressions.contains( expression ) )
{
QgsExpression* expr = new QgsExpression( expression );
expr->prepare( &context );
mExpressions[expression] = expr;
}
return mExpressions[expression];
}
void QgsDiagram::setPenWidth( QPen& pen, const QgsDiagramSettings& s, const QgsRenderContext& c )
{
pen.setWidthF( QgsSymbolLayerV2Utils::convertToPainterUnits( c, s.penWidth, s.lineSizeUnit, s.lineSizeScale ) );
}
QSizeF QgsDiagram::sizePainterUnits( QSizeF size, const QgsDiagramSettings& s, const QgsRenderContext& c )
{
return QSizeF( QgsSymbolLayerV2Utils::convertToPainterUnits( c, size.width(), s.sizeType, s.sizeScale ), QgsSymbolLayerV2Utils::convertToPainterUnits( c, size.height(), s.sizeType, s.sizeScale ) );
}
float QgsDiagram::sizePainterUnits( float l, const QgsDiagramSettings& s, const QgsRenderContext& c )
{
return QgsSymbolLayerV2Utils::convertToPainterUnits( c, l, s.sizeType, s.sizeScale );
}
QFont QgsDiagram::scaledFont( const QgsDiagramSettings& s, const QgsRenderContext& c )
{
QFont f = s.font;
if ( s.sizeType == QgsSymbolV2::MapUnit )
{
f.setPixelSize( s.font.pointSizeF() / c.mapToPixel().mapUnitsPerPixel() );
}
else
{
f.setPixelSize( s.font.pointSizeF() * 0.376 * c.scaleFactor() );
}
return f;
}
void QgsDiagram::renderDiagram( const QgsAttributes& attributes, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position )
{
QgsFeature feature;
feature.setAttributes( attributes );
renderDiagram( feature, c, s, position );
}
QSizeF QgsDiagram::diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is )
{
QgsFeature feature;
feature.setAttributes( attributes );
return diagramSize( feature, c, s, is );
}