qgspalettedrasterrenderer.h

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/***************************************************************************
                         qgspalettedrasterrenderer.h
                         ---------------------------
    begin                : December 2011
    copyright            : (C) 2011 by Marco Hugentobler
    email                : marco 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 QGSPALETTEDRASTERRENDERER_H
#define QGSPALETTEDRASTERRENDERER_H
 
#include "qgis_core.h"
#include "qgis_sip.h"
#include <QVector>
 
#include "qgsrasterrenderer.h"
#include "qgscolorrampshader.h"
 
class QColor;
class QDomElement;
 
class CORE_EXPORT QgsPalettedRasterRenderer: public QgsRasterRenderer
{
  public:
 
    struct Class
    {
      Class( double value, const QColor &color = QColor(), const QString &label = QString() )
        : value( value )
        , color( color )
        , label( label )
      {}
 
      double value;
 
      QColor color;
      QString label;
    };
 
    typedef QList< QgsPalettedRasterRenderer::Class > ClassData;
 
    QgsPalettedRasterRenderer( QgsRasterInterface *input, int bandNumber, const ClassData &classes );
 
    QgsPalettedRasterRenderer( const QgsPalettedRasterRenderer & ) = delete;
    const QgsPalettedRasterRenderer &operator=( const QgsPalettedRasterRenderer & ) = delete;
 
    QgsPalettedRasterRenderer *clone() const override SIP_FACTORY;
    static QgsRasterRenderer *create( const QDomElement &elem, QgsRasterInterface *input ) SIP_FACTORY;
 
    QgsRasterBlock *block( int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback = nullptr ) override SIP_FACTORY;
 
    int nColors() const { return mClassData.size(); }
 
    ClassData classes() const;
 
    QString label( double idx ) const;
 
    void setLabel( double idx, const QString &label );
 
    int band() const { return mBand; }
 
    void writeXml( QDomDocument &doc, QDomElement &parentElem ) const override;
    QList< QPair< QString, QColor > > legendSymbologyItems() const override;
    QList<QgsLayerTreeModelLegendNode *> createLegendNodes( QgsLayerTreeLayer *nodeLayer ) SIP_FACTORY override;
    QList<int> usesBands() const override;
    void toSld( QDomDocument &doc, QDomElement &element, const QVariantMap &props = QVariantMap() ) const override;
    bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;
 
    void setSourceColorRamp( QgsColorRamp *ramp SIP_TRANSFER );
 
    QgsColorRamp *sourceColorRamp() const;
 
    static QgsPalettedRasterRenderer::ClassData colorTableToClassData( const QList<QgsColorRampShader::ColorRampItem> &table );
 
    static QgsPalettedRasterRenderer::ClassData classDataFromString( const QString &string );
 
    static QgsPalettedRasterRenderer::ClassData classDataFromFile( const QString &path );
 
    static QString classDataToString( const QgsPalettedRasterRenderer::ClassData &classes );
 
    static QgsPalettedRasterRenderer::ClassData classDataFromRaster( QgsRasterInterface *raster, int bandNumber, QgsColorRamp *ramp = nullptr,
        QgsRasterBlockFeedback *feedback = nullptr );
 
  private:
#ifdef SIP_RUN
    QgsPalettedRasterRenderer( const QgsPalettedRasterRenderer & );
    const QgsPalettedRasterRenderer &operator=( const QgsPalettedRasterRenderer & );
#endif
 
 
    int mBand;
    ClassData mClassData;
 
    std::unique_ptr<QgsColorRamp> mSourceColorRamp;
 
    QMap< double, QRgb > mColors;
    void updateArrays();
 
    // Maximum number of allowed classes for float rasters
    static const int MAX_FLOAT_CLASSES;
};
 
#endif // QGSPALETTEDRASTERRENDERER_H