qgsmeshvectorrenderer.h

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/***************************************************************************
                         qgstriangularmesh.h
                         -------------------
    begin                : April 2018
    copyright            : (C) 2018 by Peter Petrik
    email                : zilolv 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 QGSMESHVECTORRENDERER_H
#define QGSMESHVECTORRENDERER_H


#define SIP_NO_FILE

#include <QVector>
#include <QSize>

#include "qgis_core.h"
#include "qgsmeshdataprovider.h"
#include "qgstriangularmesh.h"
#include "qgsmeshlayer.h"
#include "qgspointxy.h"

class QgsRenderContext;



class QgsMeshVectorRenderer
{
  public:
    QgsMeshVectorRenderer() = default;

    virtual ~QgsMeshVectorRenderer();

    virtual void draw() = 0;

    static QgsMeshVectorRenderer *makeVectorRenderer(
      const QgsTriangularMesh &m,
      const QgsMeshDataBlock &datasetVectorValues,
      const QgsMeshDataBlock &scalarActiveFaceFlagValues,
      const QVector<double> &datasetValuesMag,
      double datasetMagMaximumValue,
      double datasetMagMinimumValue,
      bool dataIsOnVertices,
      const QgsMeshRendererVectorSettings &settings,
      QgsRenderContext &context,
      const QgsRectangle &layerExtent,
      QSize size );
};

class QgsMeshVectorArrowRenderer : public QgsMeshVectorRenderer
{
  public:
    QgsMeshVectorArrowRenderer( const QgsTriangularMesh &m,
                                const QgsMeshDataBlock &datasetValues,
                                const QVector<double> &datasetValuesMag,
                                double datasetMagMaximumValue,
                                double datasetMagMinimumValue,
                                bool dataIsOnVertices,
                                const QgsMeshRendererVectorSettings &settings,
                                QgsRenderContext &context,
                                QSize size );
    ~QgsMeshVectorArrowRenderer() override;

    void draw() override;

  private:
    void drawVectorDataOnVertices( const QList<int> &trianglesInExtent );
    void drawVectorDataOnFaces( const QList<int> &trianglesInExtent );
    void drawVectorDataOnGrid( const QList<int> &trianglesInExtent );
    void drawVectorArrow( const QgsPointXY &lineStart, double xVal, double yVal, double magnitude );
    bool calcVectorLineEnd( QgsPointXY &lineEnd,
                            double &vectorLength,
                            double &cosAlpha,
                            double &sinAlpha, //out
                            const QgsPointXY &lineStart,
                            double xVal,
                            double yVal,
                            double magnitude //in
                          );

    double calcExtentBufferSize() const;

    const QgsTriangularMesh &mTriangularMesh;
    const QgsMeshDataBlock &mDatasetValues;
    const QVector<double> &mDatasetValuesMag; //magnitudes
    double mMinMag = 0.0;
    double mMaxMag = 0.0;
    QgsRenderContext &mContext;
    const QgsMeshRendererVectorSettings mCfg;
    bool mDataOnVertices = true;
    QSize mOutputSize;
    QgsRectangle mBufferedExtent;
};




#endif // QGSMESHVECTORRENDERER_H