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 "qgsexpressioncontext.h"
#include <QPen>
#include <QBrush>

class QPainter;
class QPointF;
class QgsDiagramSettings;
class QgsDiagramInterpolationSettings;

class QgsRenderContext;

class QgsExpression;



class CORE_EXPORT QgsDiagram
{
  public:
    virtual ~QgsDiagram() { clearCache(); }
    virtual QgsDiagram* clone() const = 0;

    void clearCache();

    Q_DECL_DEPRECATED QgsExpression* getExpression( const QString& expression, const QgsFields* fields );

    QgsExpression* getExpression( const QString& expression, const QgsExpressionContext& context );

    virtual Q_DECL_DEPRECATED void renderDiagram( const QgsAttributes& att, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position );
    virtual void renderDiagram( const QgsFeature& feature, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position ) = 0;
    virtual QString diagramName() const = 0;
    virtual QSizeF diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s ) = 0;
    virtual Q_DECL_DEPRECATED QSizeF diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is );
    virtual QSizeF diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) = 0;

    virtual double legendSize( double value, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) const = 0;

  protected:
    QgsDiagram();
    QgsDiagram( const QgsDiagram& other );

    void setPenWidth( QPen& pen, const QgsDiagramSettings& s, const QgsRenderContext& c );

    QSizeF sizePainterUnits( 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 );

    QSizeF sizeForValue( double value, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) const;

  private:
    QMap<QString, QgsExpression*> mExpressions;
};

#endif // QGSDIAGRAM_H