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 "qgis_core.h"
#include "qgis.h"
#include <QPen>
#include <QBrush>
#include "qgsexpression.h" //for QMap with QgsExpression

class QPainter;
class QPointF;
class QgsDiagramSettings;
class QgsDiagramInterpolationSettings;
class QgsFeature;
class QgsRenderContext;
class QgsExpressionContext;
class QgsFields;
class QgsAttributes;


class CORE_EXPORT QgsDiagram
{
  public:

    virtual ~QgsDiagram() { clearCache(); }

    virtual QgsDiagram *clone() const = 0 SIP_FACTORY;

    void clearCache();

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

    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 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() = default;
    QgsDiagram( const QgsDiagram &other );

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

    QSizeF sizePainterUnits( QSizeF size, const QgsDiagramSettings &s, const QgsRenderContext &c );

    double sizePainterUnits( double 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