qgsmeshlayerrenderer.h

Go to the documentation of this file.

/***************************************************************************
                         qgsmeshlayerrenderer.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 QGSMESHLAYERRENDERER_H
#define QGSMESHLAYERRENDERER_H
 
class QgsMeshLayer;
 
#define SIP_NO_FILE
 
#include <memory>
#include <limits>
 
#include "qgis.h"
 
#include "qgsmaplayerrenderer.h"
#include "qgsrasterinterface.h"
#include "qgstriangularmesh.h"
#include "qgsmeshlayer.h"
#include "qgsmeshdataprovider.h"
#include "qgsmeshtracerenderer.h"
#include "qgsmapclippingregion.h"
 
class QgsRenderContext;
 
 
class QgsMeshLayerRendererFeedback : public QgsRasterBlockFeedback
{
    Q_OBJECT
};
 
 
struct CORE_NO_EXPORT QgsMeshLayerRendererCache
{
  int mDatasetGroupsCount = 0;
 
  // scalar dataset
  QgsMeshDatasetIndex mActiveScalarDatasetIndex;
  QVector<double> mScalarDatasetValues;
  QgsMeshDataBlock mScalarActiveFaceFlagValues;
  QgsMeshDatasetGroupMetadata::DataType mScalarDataType = QgsMeshDatasetGroupMetadata::DataType::DataOnVertices;
  double mScalarDatasetMinimum = std::numeric_limits<double>::quiet_NaN();
  double mScalarDatasetMaximum = std::numeric_limits<double>::quiet_NaN();
  QgsMeshRendererScalarSettings::DataResamplingMethod mDataInterpolationMethod = QgsMeshRendererScalarSettings::None;
  std::unique_ptr<QgsMesh3dAveragingMethod> mScalarAveragingMethod;
 
  // vector dataset
  QgsMeshDatasetIndex mActiveVectorDatasetIndex;
  QgsMeshDataBlock mVectorDatasetValues;
  QVector<double> mVectorDatasetValuesMag;
  double mVectorDatasetMagMinimum = std::numeric_limits<double>::quiet_NaN();
  double mVectorDatasetMagMaximum = std::numeric_limits<double>::quiet_NaN();
  double mVectorDatasetGroupMagMinimum = std::numeric_limits<double>::quiet_NaN();
  double mVectorDatasetGroupMagMaximum = std::numeric_limits<double>::quiet_NaN();
  QgsMeshDatasetGroupMetadata::DataType mVectorDataType = QgsMeshDatasetGroupMetadata::DataType::DataOnVertices;
  std::unique_ptr<QgsMesh3dAveragingMethod> mVectorAveragingMethod;
};
 
 
 
class QgsMeshLayerRenderer : public QgsMapLayerRenderer
{
  public:
    QgsMeshLayerRenderer( QgsMeshLayer *layer, QgsRenderContext &context );
    ~QgsMeshLayerRenderer() override = default;
    QgsFeedback *feedback() const override;
    bool render() override;
    bool forceRasterRender() const override;
 
  private:
    void renderMesh();
    void renderEdgeMesh( const QgsMeshRendererMeshSettings &settings, const QList<int> &edgesInExtent );
    void renderFaceMesh( const QgsMeshRendererMeshSettings &settings, const QVector<QgsMeshFace> &faces, const QList<int> &facesInExtent );
    void renderScalarDataset();
    void renderScalarDatasetOnEdges( const QgsMeshRendererScalarSettings &scalarSettings );
    void renderScalarDatasetOnFaces( const QgsMeshRendererScalarSettings &scalarSettings );
 
    void renderVectorDataset();
    void copyTriangularMeshes( QgsMeshLayer *layer, QgsRenderContext &context );
    void copyScalarDatasetValues( QgsMeshLayer *layer );
    void copyVectorDatasetValues( QgsMeshLayer *layer );
    void calculateOutputSize();
    QgsPointXY fractionPoint( const QgsPointXY &p1, const QgsPointXY &p2, double fraction ) const;
    bool mIsMeshSimplificationActive = false;
    QColor colorAt( QgsColorRampShader *shader, double val ) const;
 
  protected:
    std::unique_ptr<QgsMeshLayerRendererFeedback> mFeedback;
 
    // copy from mesh layer
    QgsMesh mNativeMesh;
 
    // copy from mesh layer
    QgsTriangularMesh mTriangularMesh;
 
    // copy from mesh layer
    QgsRectangle mLayerExtent;
 
    // copy of the scalar dataset
    QVector<double> mScalarDatasetValues;
    QgsMeshDataBlock mScalarActiveFaceFlagValues;
    QgsMeshDatasetGroupMetadata::DataType mScalarDataType = QgsMeshDatasetGroupMetadata::DataOnVertices;
    double mScalarDatasetMinimum = std::numeric_limits<double>::quiet_NaN();
    double mScalarDatasetMaximum = std::numeric_limits<double>::quiet_NaN();
 
    // copy of the vector dataset
    QgsMeshDataBlock mVectorDatasetValues;
    QVector<double> mVectorDatasetValuesMag;
    double mVectorDatasetMagMinimum = std::numeric_limits<double>::quiet_NaN();
    double mVectorDatasetMagMaximum = std::numeric_limits<double>::quiet_NaN();
    double mVectorDatasetGroupMagMinimum = std::numeric_limits<double>::quiet_NaN();
    double mVectorDatasetGroupMagMaximum = std::numeric_limits<double>::quiet_NaN();
    QgsMeshDatasetGroupMetadata::DataType mVectorDataType = QgsMeshDatasetGroupMetadata::DataOnVertices;
 
    // copy of rendering settings
    QgsMeshRendererSettings mRendererSettings;
 
    QList< QgsMapClippingRegion > mClippingRegions;
 
    // output screen size
    QSize mOutputSize;
 
  private:
 
    double mLayerOpacity = 1.0;
};
 
 
#endif // QGSMESHLAYERRENDERER_H