qgshillshaderenderer.h

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/***************************************************************************
                         qgshillshaderenderer.cpp
                         ---------------------------------
    begin                : May 2016
    copyright            : (C) 2016 by Nathan Woodrow
    email                : woodrow dot nathan at gmail dot com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 QGSHILLSHADERENDERER_H
#define QGSHILLSHADERENDERER_H


#include "qgsrasterrenderer.h"

class QgsRasterBlock;
class QgsRectangle;
class QgsRasterInterface;


class CORE_EXPORT QgsHillshadeRenderer : public QgsRasterRenderer
{
  public:
    QgsHillshadeRenderer( QgsRasterInterface* input, int band, double lightAzimuth, double lightAltitude );

    QgsHillshadeRenderer * clone() const override;

    static QgsRasterRenderer* create( const QDomElement& elem, QgsRasterInterface* input );

    void writeXML( QDomDocument& doc, QDomElement& parentElem ) const override;

    QgsRasterBlock *block( int bandNo, QgsRectangle  const & extent, int width, int height ) override;
    QgsRasterBlock *block2( int bandNo, QgsRectangle  const & extent, int width, int height, QgsRasterBlockFeedback* feedback = nullptr ) override;

    QList<int> usesBands() const override;

    int band() const { return mBand; }

    void setBand( int bandNo );

    double azimuth() const { return mLightAzimuth; }

    double altitude()  const { return mLightAngle; }

    double zFactor()  const { return mZFactor; }

    bool multiDirectional() const { return mMultiDirectional; }

    void setAzimuth( double azimuth ) { mLightAzimuth = azimuth; }

    void setAltitude( double altitude ) { mLightAngle = altitude; }

    void setZFactor( double zfactor ) { mZFactor = zfactor; }

    void setMultiDirectional( bool isMultiDirectional ) { mMultiDirectional = isMultiDirectional; }

  private:
    int mBand;
    double mZFactor;
    double mLightAngle;
    double mLightAzimuth;
    bool mMultiDirectional;

    double calcFirstDerX( double x11, double x21, double x31, double x12, double x22, double x32, double x13, double x23, double x33 , double cellsize );

    double calcFirstDerY( double x11, double x21, double x31, double x12, double x22, double x32, double x13, double x23, double x33 , double cellsize );
};

#endif // QGSHILLSHADERENDERER_H