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qgsdiagram.h
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qgsdiagram.h
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/***************************************************************************
qgsdiagram.h
---------------------
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. *
* *
***************************************************************************/
#ifndef QGSDIAGRAM_H
#define QGSDIAGRAM_H
#include "qgsfeature.h"
#include <QPen>
#include <QBrush>
class QPainter;
class QPointF;
struct QgsDiagramSettings;
struct QgsDiagramInterpolationSettings;
class QgsRenderContext;
/**Base class for all diagram types*/
class CORE_EXPORT QgsDiagram
{
public:
virtual ~QgsDiagram() {}
/**Draws the diagram at the given position (in pixel coordinates)*/
virtual void renderDiagram( const QgsAttributeMap& att, QgsRenderContext& c, const QgsDiagramSettings& s, const QPointF& position ) = 0;
virtual QString diagramName() const = 0;
/**Returns the size in map units the diagram will use to render.*/
virtual QSizeF diagramSize( const QgsAttributeMap& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s ) = 0;
/**Returns the size in map units the diagram will use to render. Interpolat size*/
virtual QSizeF diagramSize( const QgsAttributeMap& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) = 0;
protected:
void setPenWidth( QPen& pen, const QgsDiagramSettings& s, const QgsRenderContext& c );
QSizeF sizePainterUnits( const QSizeF& size, const QgsDiagramSettings& s, const QgsRenderContext& c );
QSizeF sizeForPAL( const QSizeF& size, const QgsDiagramSettings& s, const QgsRenderContext& c );
float sizePainterUnits( float l, const QgsDiagramSettings& s, const QgsRenderContext& c );
QFont scaledFont( const QgsDiagramSettings& s, const QgsRenderContext& c );
};
#endif // QGSDIAGRAM_H