qgsmeshvectorfieldvaluesource.h

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/***************************************************************************
                         qgsmeshvectorfieldvaluesource.h
                         -------------------------------
    begin                : September 2026
    copyright            : (C) 2026 by Stefanos Natsis
    email                : uclaros 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 QGSMESHVECTORFIELDVALUESOURCE_H
#define QGSMESHVECTORFIELDVALUESOURCE_H
 
#include "qgsmeshdataset.h"
#include "qgstriangularmesh.h"
#include "qgsvectorfieldvaluesource.h"
 
#define SIP_NO_FILE


class QgsMeshVectorFieldValueSource : public QgsVectorFieldValueSource
{
  public:
    QgsMeshVectorFieldValueSource(
      const QgsTriangularMesh &triangularMesh,
      const QgsMeshDataBlock &datasetVectorValues,
      const QgsMeshDataBlock &scalarActiveFaceFlagValues,
      const QVector<double> &datasetMagnitudeValues,
      QgsMeshDatasetGroupMetadata::DataType dataType,
      const QgsRectangle &layerExtent,
      double maximumMagnitude
    );

    static std::unique_ptr<QgsMeshVectorFieldValueSource> create(
      const QgsTriangularMesh &triangularMesh,
      const QgsMeshDataBlock &datasetVectorValues,
      const QgsMeshDataBlock &scalarActiveFaceFlagValues,
      const QVector<double> &datasetMagnitudeValues,
      QgsMeshDatasetGroupMetadata::DataType dataType,
      const QgsRectangle &layerExtent,
      double maximumMagnitude
    );
 
    QgsVector vectorValue( const QgsPointXY &point ) const override;
    QgsRectangle extent() const override;
    double maximumMagnitude() const override;
    QVector<QgsPointXY> seedPoints( const QgsRectangle &extent ) const override;

    std::unique_ptr<QgsRasterInterface> magnitudeSource( const QgsRenderContext &context, QSize size ) const override;
 
  protected:
    virtual QgsVector interpolatedValuePrivate( int faceIndex, const QgsPointXY point ) const = 0;
 
    bool isVectorValid( const QgsVector &v ) const;
 
    QgsTriangularMesh mTriangularMesh;
    QgsMeshDataBlock mDatasetValues;
    QgsMeshDataBlock mActiveFaceFlagValues;
    QVector<double> mMagnitudeValues;
    QgsMeshDatasetGroupMetadata::DataType mDataType = QgsMeshDatasetGroupMetadata::DataOnVertices;
    QgsRectangle mExtent;
    double mMaximumMagnitude = 0;
    bool mUseScalarActiveFaceFlagValues = false;
    mutable int mCacheFaceIndex = -1;
 
  private:
    void activeFaceFilter( QgsVector &vector, int faceIndex ) const;
};

class QgsMeshVectorFieldValueSourceFromVertex : public QgsMeshVectorFieldValueSource
{
  public:
    using QgsMeshVectorFieldValueSource::QgsMeshVectorFieldValueSource;
 
    QgsMeshVectorFieldValueSourceFromVertex *clone() const override;
 
  private:
    QgsVector interpolatedValuePrivate( int faceIndex, const QgsPointXY point ) const override;
};

class QgsMeshVectorFieldValueSourceFromFace : public QgsMeshVectorFieldValueSource
{
  public:
    using QgsMeshVectorFieldValueSource::QgsMeshVectorFieldValueSource;
 
    QgsMeshVectorFieldValueSourceFromFace *clone() const override;
 
  private:
    QgsVector interpolatedValuePrivate( int faceIndex, const QgsPointXY point ) const override;
};

 
#endif // QGSMESHVECTORFIELDVALUESOURCE_H