qgsvectorlayerchunkloader_p.h

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/***************************************************************************
  qgsvectorlayerchunkloader_p.h
  --------------------------------------
  Date                 : July 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 QGSVECTORLAYERCHUNKLOADER_P_H
#define QGSVECTORLAYERCHUNKLOADER_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 "qgs3drendercontext.h"
#include "qgsabstractfeaturebasedchunkedentity.h"
#include "qgschunkloader.h"
#include "qgschunknode.h"
#include "qgscoordinatetransform.h"
#include "qgsfeaturerequest.h"
#include "qgsvector3d.h"
 
#define SIP_NO_FILE
 
class QgsVectorLayer;
class QgsVectorLayer3DTilingSettings;
class QgsVectorLayerFeatureSource;
class QgsAbstract3DSymbol;
class QgsFeature3DHandler;
 
namespace Qt3DCore
{
  class QTransform;
}
 
#include <QFutureWatcher>
#include <QMutex>
 

class QgsVectorLayerChunkLoader : public QgsQuadtreeChunkLoader
{
    Q_OBJECT
 
  public:
    QgsVectorLayerChunkLoader( const Qgs3DRenderContext &context, QgsVectorLayer *vl, QgsAbstract3DSymbol *symbol, double zMin, double zMax, int maxFeatures );
 
    QFuture<QgsChunkLoaderResult> loadChunk( QgsChunkNode *node ) override;
    QgsChunkNode *createRootNode() const override;
    QFuture<QVector<QgsChunkNode *>> createChildren( QgsChunkNode *node ) override;
 
  private:
    struct NodeIsLeafMap
    {
        QHash< QString, bool > map;
        QMutex mutex;
    };
 
    struct ChunkData
    {
        std::shared_ptr<QgsFeature3DHandler> handler;
        Qgs3DRenderContext renderCtx;
    };
 
    static void loadChunkInWorker(
      QPromise<ChunkData> &promise,
      std::shared_ptr<QgsFeature3DHandler> handler,
      Qgs3DRenderContext renderCtx,
      const std::unique_ptr<QgsVectorLayerFeatureSource> &source,
      const QgsFeatureRequest &req,
      QgsChunkNode *node,
      int maxFeatures,
      const std::shared_ptr<NodeIsLeafMap> &nodesAreLeafs,
      QgsCoordinateTransform layerToRenderCrs,
      bool isGeocentric
    );
 
    Qt3DCore::QEntity *createEntity( QgsChunkNode *node, ChunkData data, Qt3DCore::QEntity *parent );
 
    Qgs3DRenderContext mRenderContext;
    QgsVectorLayer *mLayer;
    std::unique_ptr<QgsAbstract3DSymbol> mSymbol;
    std::shared_ptr<NodeIsLeafMap> mNodesAreLeafs;
    int mMaxFeatures;
 
    bool mIsGeocentric = false;
 
    // below only used for geocentric case
    QgsChunkNodeId mRootNodeId;
    QgsCoordinateTransform mCrsToLatLon;
 
    QgsVector3D mRadius;
 
    friend class QgsVectorLayerChunkedEntity;
};
 

class QgsVectorLayerChunkedEntity : public QgsAbstractFeatureBasedChunkedEntity
{
    Q_OBJECT
  public:
    explicit QgsVectorLayerChunkedEntity( Qgs3DMapSettings *map, QgsVectorLayer *vl, double zMin, double zMax, const QgsVectorLayer3DTilingSettings &tilingSettings, QgsAbstract3DSymbol *symbol );
 
    ~QgsVectorLayerChunkedEntity() override;
 
  private:
    bool applyTerrainOffset() const override;
};

 
#endif // QGSVECTORLAYERCHUNKLOADER_P_H