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 <Qt3DCore/QEntity>
 
class QgsFeature;
 
 
#include "qgsexpressioncontext.h"
 
class Qgs3DMapSettings;
 
#define SIP_NO_FILE
 
 
class Qgs3DRenderContext
{
  public:
    Qgs3DRenderContext( const Qgs3DMapSettings &map ) : mMap( map ) {}
 
    const Qgs3DMapSettings &map() const { return mMap; }
 
    void setExpressionContext( const QgsExpressionContext &context ) { mExpressionContext = context; }
 
    QgsExpressionContext &expressionContext() { return mExpressionContext; }
 
    const QgsExpressionContext &expressionContext() const { return mExpressionContext; } SIP_SKIP
 
  private:
    const Qgs3DMapSettings &mMap;
    QgsExpressionContext mExpressionContext;
 
};
 
 
class QgsFeature3DHandler
{
  public:
    virtual ~QgsFeature3DHandler() = default;
 
    virtual bool prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames ) = 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; }
 
  protected:
    void updateZRangeFromPositions( const QVector<QVector3D> &positions );
 
  protected:
    float mZMin = std::numeric_limits<float>::max();
    float mZMax = std::numeric_limits<float>::lowest();
    int mFeatureCount = 0;
};
 
 
class Qgs3DMapSettings;
class QgsVectorLayer;
 
namespace Qgs3DSymbolImpl
{
  Qt3DCore::QEntity *entityFromHandler( QgsFeature3DHandler *handler, const Qgs3DMapSettings &map, QgsVectorLayer *layer );
}
 
 
 
#endif // QGSFEATURE3DHANDLER_P_H