qgsmeshvectorrenderer.h

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/***************************************************************************
                         qgsmeshvectorrenderer.h
                         -------------------
    begin                : May 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
 
#include <memory>
 
#include "qgsmeshdataset.h"
#include "qgsmeshutils.h"
#include "qgsvectorfieldengine.h"
 
#include <QSize>
#include <QVector>
 
#define SIP_NO_FILE
 
class QgsMeshVectorFieldValueSource;
class QgsPointXY;
class QgsRasterBlockFeedback;
class QgsRenderContext;
class QgsTriangularMesh;
class QgsMeshDataBlock;

 
 
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,
      QgsMeshDatasetGroupMetadata::DataType dataType,
      const QgsVectorFieldSettings &settings,
      QgsRenderContext &context,
      const QgsRectangle &layerExtent,
      QgsRasterBlockFeedback *feedBack,
      const QSize &size
    );
};

class QgsMeshVectorGlyphRenderer : public QgsMeshVectorRenderer
{
  public:
    QgsMeshVectorGlyphRenderer(
      const QgsTriangularMesh &m,
      const QgsMeshDataBlock &datasetValues,
      const QVector<double> &datasetValuesMag,
      double datasetMagMaximumValue,
      double datasetMagMinimumValue,
      QgsMeshDatasetGroupMetadata::DataType dataType,
      const QgsVectorFieldSettings &settings,
      QgsRenderContext &context,
      QSize size
    );
    ~QgsMeshVectorGlyphRenderer() override;

    void draw() override;
 
  private:
    void drawVectorDataOnVertices();
    void drawVectorDataOnFaces();
    void drawVectorDataOnEdges();
    void drawVectorDataOnPoints( const QSet<int> indexesToRender, const QVector<QgsMeshVertex> &points );
    void drawVectorDataOnGrid();

    double calcExtentBufferSize() const;
 
    const QgsTriangularMesh &mTriangularMesh;
    const QgsMeshDataBlock &mDatasetValues;
    const QVector<double> &mDatasetValuesMag; //magnitudes
    double mMinMag = 0.0;
    double mMaxMag = 0.0;
    QgsMeshDatasetGroupMetadata::DataType mDataType = QgsMeshDatasetGroupMetadata::DataType::DataOnVertices;
    QgsRectangle mBufferedExtent;
 
    QgsRenderContext &mContext;
    const QgsVectorFieldSettings mCfg;
    QSize mOutputSize;
 
    QgsVectorFieldEngine mEngine;
};

class QgsMeshVectorStreamlineRenderer : public QgsMeshVectorRenderer
{
  public:
    QgsMeshVectorStreamlineRenderer(
      const QgsTriangularMesh &m,
      const QgsMeshDataBlock &datasetValues,
      const QgsMeshDataBlock &scalarActiveFaceFlagValues,
      const QVector<double> &datasetValuesMag,
      double datasetMagMaximumValue,
      double datasetMagMinimumValue,
      QgsMeshDatasetGroupMetadata::DataType dataType,
      const QgsVectorFieldSettings &settings,
      QgsRenderContext &context,
      const QgsRectangle &layerExtent,
      QgsRasterBlockFeedback *feedBack,
      QSize size
    );
    ~QgsMeshVectorStreamlineRenderer() override;
 
    void draw() override;
 
  private:
    const QgsVectorFieldSettings mCfg;
    QgsRasterBlockFeedback *mFeedBack = nullptr;
    std::unique_ptr<QgsMeshVectorFieldValueSource> mSource;
    QgsVectorFieldEngine mEngine;
};

 
 
#endif // QGSMESHVECTORRENDERER_H