qgsrulebasedchunkloader_p.h

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/***************************************************************************
  qgsrulebasedchunkloader_p.h
  --------------------------------------
  Date                 : November 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 QGSRULEBASEDCHUNKLOADER_H
#define QGSRULEBASEDCHUNKLOADER_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 "qgschunkedentity.h"
#include "qgschunkloader.h"
#include "qgsrulebased3drenderer.h"
 
#include <QFutureWatcher>
 
#define SIP_NO_FILE
 
class Qgs3DMapSettings;
class QgsVectorLayer;
class QgsVectorLayerFeatureSource;
class QgsAbstract3DSymbol;
class QgsFeature3DHandler;
 
namespace Qt3DCore
{
  class QTransform;
}

class QgsRuleBasedChunkLoaderFactory : public QgsQuadtreeChunkLoaderFactory
{
    Q_OBJECT
 
  public:
    QgsRuleBasedChunkLoaderFactory( const Qgs3DRenderContext &context, QgsVectorLayer *vl, QgsRuleBased3DRenderer::Rule *rootRule, double zMin, double zMax, int maxFeatures );
    ~QgsRuleBasedChunkLoaderFactory() override;

    QgsChunkLoader *createChunkLoader( QgsChunkNode *node ) const override;
    bool canCreateChildren( QgsChunkNode *node ) override;
    QVector<QgsChunkNode *> createChildren( QgsChunkNode *node ) const override;
 
    Qgs3DRenderContext mRenderContext;
    QgsVectorLayer *mLayer;
    std::unique_ptr<QgsRuleBased3DRenderer::Rule> mRootRule;
    mutable QHash< QString, bool > mNodesAreLeafs;
    int mMaxFeatures;
};
 

class QgsRuleBasedChunkLoader : public QgsChunkLoader
{
    Q_OBJECT
 
  public:
    QgsRuleBasedChunkLoader( const QgsRuleBasedChunkLoaderFactory *factory, QgsChunkNode *node );
    ~QgsRuleBasedChunkLoader() override;
 
    void start() override;
    void cancel() override;
    Qt3DCore::QEntity *createEntity( Qt3DCore::QEntity *parent ) override;
 
  private:
    const QgsRuleBasedChunkLoaderFactory *mFactory;
    QgsRuleBased3DRenderer::RuleToHandlerMap mHandlers;
    Qgs3DRenderContext mContext;
    std::unique_ptr<QgsVectorLayerFeatureSource> mSource;
    bool mCanceled = false;
    QFutureWatcher<void> *mFutureWatcher = nullptr;
    std::unique_ptr<QgsRuleBased3DRenderer::Rule> mRootRule;
    bool mNodeIsLeaf = false;
};
 

class QgsRuleBasedChunkedEntity : public QgsChunkedEntity
{
    Q_OBJECT
  public:
    explicit QgsRuleBasedChunkedEntity( Qgs3DMapSettings *map, QgsVectorLayer *vl, double zMin, double zMax, const QgsVectorLayer3DTilingSettings &tilingSettings, QgsRuleBased3DRenderer::Rule *rootRule );
 
    QList<QgsRayCastHit> rayIntersection( const QgsRay3D &ray, const QgsRayCastContext &context ) const override;
 
    ~QgsRuleBasedChunkedEntity() override;
  private slots:
    void onTerrainElevationOffsetChanged();
 
  private:
    Qt3DCore::QTransform *mTransform = nullptr;
 
    bool applyTerrainOffset() const;
};

 
#endif // QGSRULEBASEDCHUNKLOADER_H