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.h"
#include "qgis_core.h"
#include "qgsexpression.h"
 
#include <QBrush>
#include <QPen>
#include <QString>
 
using namespace Qt::StringLiterals;
 
class QPainter;
class QPointF;
class QgsDiagramSettings;
class QgsDiagramInterpolationSettings;
class QgsFeature;
class QgsRenderContext;
class QgsExpressionContext;
class QgsFields;
class QgsAttributes;
 

class CORE_EXPORT QgsDiagram SIP_NODEFAULTCTORS
{
  public:
#ifdef SIP_RUN
    SIP_CONVERT_TO_SUBCLASS_CODE
    if ( sipCpp->diagramName() == "Pie"_L1 )
      sipType = sipType_QgsPieDiagram;
    else if ( sipCpp->diagramName() == "Histogram"_L1 )
      sipType = sipType_QgsHistogramDiagram;
    else if ( sipCpp->diagramName() == "Text"_L1 )
      sipType = sipType_QgsTextDiagram;
    else if ( sipCpp->diagramName() == "Stacked"_L1 )
      sipType = sipType_QgsStackedBarDiagram;
    else if ( sipCpp->diagramName() == "StackedDiagram"_L1 )
      sipType = sipType_QgsStackedDiagram;
    else
      sipType = NULL;
    SIP_END
#endif
 
    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 &interpolationSettings ) = 0;

    virtual double legendSize( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &interpolationSettings ) 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 &interpolationSettings ) const;
 
  private:
    QMap<QString, QgsExpression *> mExpressions;
    QgsDiagram &operator=( const QgsDiagram & ) = delete;
};
 
#endif // QGSDIAGRAM_H