qgsvectorlayer3drenderer.cpp

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/***************************************************************************
  qgsvectorlayer3drenderer.cpp
  --------------------------------------
  Date                 : July 2017
  Copyright            : (C) 2017 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsvectorlayer3drenderer.h"
 
#include "qgs3dutils.h"
#include "qgschunkedentity_p.h"
#include "qgsvectorlayerchunkloader_p.h"
 
#include "qgsvectorlayer.h"
#include "qgsxmlutils.h"
#include "qgsapplication.h"
#include "qgs3dsymbolregistry.h"
 
 
QgsVectorLayer3DRendererMetadata::QgsVectorLayer3DRendererMetadata()
  : Qgs3DRendererAbstractMetadata( QStringLiteral( "vector" ) )
{
}
 
QgsAbstract3DRenderer *QgsVectorLayer3DRendererMetadata::createRenderer( QDomElement &elem, const QgsReadWriteContext &context )
{
  QgsVectorLayer3DRenderer *r = new QgsVectorLayer3DRenderer;
  r->readXml( elem, context );
  return r;
}
 
 
// ---------
 
 
QgsVectorLayer3DRenderer::QgsVectorLayer3DRenderer( QgsAbstract3DSymbol *s )
  : mSymbol( s )
{
}
 
QgsVectorLayer3DRenderer *QgsVectorLayer3DRenderer::clone() const
{
  QgsVectorLayer3DRenderer *r = new QgsVectorLayer3DRenderer( mSymbol ? mSymbol->clone() : nullptr );
  copyBaseProperties( r );
  return r;
}
 
void QgsVectorLayer3DRenderer::setSymbol( QgsAbstract3DSymbol *symbol )
{
  mSymbol.reset( symbol );
}
 
const QgsAbstract3DSymbol *QgsVectorLayer3DRenderer::symbol() const
{
  return mSymbol.get();
}
 
Qt3DCore::QEntity *QgsVectorLayer3DRenderer::createEntity( const Qgs3DMapSettings &map ) const
{
  QgsVectorLayer *vl = layer();
 
  if ( !mSymbol || !vl )
    return nullptr;
 
  // we start with a maximal z range (based on a number similar to the radius of the Earth),
  // because we can't know this upfront. There's too many
  // factors to consider eg vertex z data, terrain heights, data defined offsets and extrusion heights,...
  // This range will be refined after populating the nodes to the actual z range of the generated chunks nodes.
  // Assuming the vertical height is in meter, then it's extremely unlikely that a real vertical
  // height will exceed this amount!
  constexpr double MINIMUM_VECTOR_Z_ESTIMATE = -5000000;
  constexpr double MAXIMUM_VECTOR_Z_ESTIMATE = 5000000;
  return new QgsVectorLayerChunkedEntity( vl, MINIMUM_VECTOR_Z_ESTIMATE, MAXIMUM_VECTOR_Z_ESTIMATE, tilingSettings(), mSymbol.get(), map );
}
 
void QgsVectorLayer3DRenderer::writeXml( QDomElement &elem, const QgsReadWriteContext &context ) const
{
  QDomDocument doc = elem.ownerDocument();
 
  writeXmlBaseProperties( elem, context );
 
  QDomElement elemSymbol = doc.createElement( QStringLiteral( "symbol" ) );
  if ( mSymbol )
  {
    elemSymbol.setAttribute( QStringLiteral( "type" ), mSymbol->type() );
    mSymbol->writeXml( elemSymbol, context );
  }
  elem.appendChild( elemSymbol );
}
 
void QgsVectorLayer3DRenderer::readXml( const QDomElement &elem, const QgsReadWriteContext &context )
{
  readXmlBaseProperties( elem, context );
 
  const QDomElement elemSymbol = elem.firstChildElement( QStringLiteral( "symbol" ) );
  const QString symbolType = elemSymbol.attribute( QStringLiteral( "type" ) );
  mSymbol.reset( QgsApplication::symbol3DRegistry()->createSymbol( symbolType ) );
  if ( mSymbol )
    mSymbol->readXml( elemSymbol, context );
}