qgsfeature3dhandler_p.h

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/***************************************************************************
  qgsfeature3dhandler_p.h
  --------------------------------------
  Date                 : January 2019
  Copyright            : (C) 2019 by Martin Dobias
  Email                : wonder dot sk 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 QGSFEATURE3DHANDLER_P_H
#define QGSFEATURE3DHANDLER_P_H

 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the QGIS API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
 
#include "qgsbox3d.h"
#include "qgsvector3d.h"
 
#include <QSet>
#include <QString>
#include <QVector>
 
#define SIP_NO_FILE
 
namespace Qt3DCore
{
  class QEntity;
}
 
class Qgs3DRenderContext;
class QgsFeature;
class QgsGeometry;
 

class QgsFeature3DHandler
{
  public:
    virtual ~QgsFeature3DHandler() = default;

    virtual bool prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames, const QgsBox3D &chunkExtent ) = 0;

    virtual void processFeature( const QgsFeature &feature, const Qgs3DRenderContext &context ) = 0;

    virtual void finalize( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context ) = 0;

    float zMinimum() const { return mZMin; }

    float zMaximum() const { return mZMax; }

    int featureCount() const { return mFeatureCount; }

    void setHighlightingEnabled( bool enable ) { mHighlightingEnabled = enable; }

    bool highlightingEnabled() const { return mHighlightingEnabled; }
 
  protected:
    void updateZRangeFromPositions( const QVector<QVector3D> &positions );

    bool clipGeometryIfTooLarge( QgsGeometry &geom ) const;
 
  protected:
    float mZMin = std::numeric_limits<float>::max();
    float mZMax = std::numeric_limits<float>::lowest();
    int mFeatureCount = 0;
    bool mHighlightingEnabled = false;

    QgsVector3D mChunkOrigin;

    QgsBox3D mChunkExtent;
 
  private:
    static constexpr double MAX_GEOM_BBOX_SIZE = 1e6;
};
 

 
#endif // QGSFEATURE3DHANDLER_P_H