qgsmulticurve.cpp

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/***************************************************************************
                        qgsmulticurve.cpp
  -------------------------------------------------------------------
Date                 : 28 Oct 2014
Copyright            : (C) 2014 by Marco Hugentobler
email                : marco.hugentobler at sourcepole 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 "qgsmulticurve.h"
 
#include <memory>
#include <nlohmann/json.hpp>
 
#include "qgsapplication.h"
#include "qgscircularstring.h"
#include "qgscompoundcurve.h"
#include "qgscurve.h"
#include "qgsgeometryutils.h"
#include "qgslinestring.h"
#include "qgsmultipoint.h"
 
#include <QJsonObject>
#include <QString>
 
using namespace Qt::StringLiterals;
 
QgsMultiCurve::QgsMultiCurve()
{
  mWkbType = Qgis::WkbType::MultiCurve;
}
 
QgsCurve *QgsMultiCurve::curveN( int index )
{
  return qgsgeometry_cast< QgsCurve * >( geometryN( index ) );
}
 
const QgsCurve *QgsMultiCurve::curveN( int index ) const
{
  return qgsgeometry_cast< const QgsCurve * >( geometryN( index ) );
}
 
QString QgsMultiCurve::geometryType() const
{
  return u"MultiCurve"_s;
}
 
QgsMultiCurve *QgsMultiCurve::createEmptyWithSameType() const
{
  auto result = std::make_unique< QgsMultiCurve >();
  result->mWkbType = mWkbType;
  return result.release();
}
 
QgsMultiCurve *QgsMultiCurve::clone() const
{
  return new QgsMultiCurve( *this );
}
 
void QgsMultiCurve::clear()
{
  QgsGeometryCollection::clear();
  mWkbType = Qgis::WkbType::MultiCurve;
}
 
QgsMultiCurve *QgsMultiCurve::toCurveType() const
{
  return clone();
}
 
bool QgsMultiCurve::fromWkt( const QString &wkt )
{
  return fromCollectionWkt( wkt, { Qgis::WkbType::LineString, Qgis::WkbType::CircularString, Qgis::WkbType::CompoundCurve }, u"LineString"_s );
}
 
QDomElement QgsMultiCurve::asGml2( QDomDocument &doc, int precision, const QString &ns, const AxisOrder axisOrder ) const
{
  // GML2 does not support curves
  QDomElement elemMultiLineString = doc.createElementNS( ns, u"MultiLineString"_s );
 
  if ( isEmpty() )
    return elemMultiLineString;
 
  for ( const QgsAbstractGeometry *geom : mGeometries )
  {
    if ( qgsgeometry_cast<const QgsCurve *>( geom ) )
    {
      std::unique_ptr< QgsLineString > lineString( static_cast<const QgsCurve *>( geom )->curveToLine() );
 
      QDomElement elemLineStringMember = doc.createElementNS( ns, u"lineStringMember"_s );
      elemLineStringMember.appendChild( lineString->asGml2( doc, precision, ns, axisOrder ) );
      elemMultiLineString.appendChild( elemLineStringMember );
    }
  }
 
  return elemMultiLineString;
}
 
QDomElement QgsMultiCurve::asGml3( QDomDocument &doc, int precision, const QString &ns, const AxisOrder axisOrder ) const
{
  QDomElement elemMultiCurve = doc.createElementNS( ns, u"MultiCurve"_s );
 
  if ( isEmpty() )
    return elemMultiCurve;
 
  for ( const QgsAbstractGeometry *geom : mGeometries )
  {
    if ( qgsgeometry_cast<const QgsCurve *>( geom ) )
    {
      const QgsCurve *curve = static_cast<const QgsCurve *>( geom );
 
      QDomElement elemCurveMember = doc.createElementNS( ns, u"curveMember"_s );
      elemCurveMember.appendChild( curve->asGml3( doc, precision, ns, axisOrder ) );
      elemMultiCurve.appendChild( elemCurveMember );
    }
  }
 
  return elemMultiCurve;
}
 
json QgsMultiCurve::asJsonObject( int precision, Qgis::GeoJsonProfile profile ) const
{
  switch ( profile )
  {
    case Qgis::GeoJsonProfile::Legacy:
    case Qgis::GeoJsonProfile::Rfc7946:
    {
      json coordinates( json::array() );
      for ( const QgsAbstractGeometry *geom : std::as_const( mGeometries ) )
      {
        if ( auto curveGeom = qgsgeometry_cast<const QgsCurve *>( geom ) )
        {
          std::unique_ptr< QgsLineString > lineString( curveGeom->curveToLine() );
          QgsPointSequence pts;
          lineString->points( pts );
          coordinates.push_back( QgsGeometryUtils::pointsToJson( pts, precision, profile ) );
        }
      }
      return { { "type", "MultiLineString" }, { "coordinates", coordinates } };
    }
    case Qgis::GeoJsonProfile::JsonFg:
    case Qgis::GeoJsonProfile::JsonFgPlus:
    {
      json geometries( json::array() );
      for ( const QgsAbstractGeometry *geom : std::as_const( mGeometries ) )
      {
        if ( auto curveGeom = qgsgeometry_cast<const QgsCurve *>( geom ) )
        {
          geometries.push_back( curveGeom->asJsonObject( precision, profile ) );
        }
      }
      return { { "type", "MultiCurve" }, { "geometries", geometries } };
    }
  }
  BUILTIN_UNREACHABLE
}
 
bool QgsMultiCurve::addGeometry( QgsAbstractGeometry *g )
{
  if ( !qgsgeometry_cast<QgsCurve *>( g ) )
  {
    delete g;
    return false;
  }
 
  //As it is a fresh type and not supported by other software, NurbsCurve not allowed in MultiCurves at the moment
  const Qgis::WkbType flatType = QgsWkbTypes::flatType( g->wkbType() );
  if ( !( flatType == Qgis::WkbType::LineString || flatType == Qgis::WkbType::CircularString || flatType == Qgis::WkbType::CompoundCurve ) )
  {
    delete g;
    return false;
  }
 
  if ( mGeometries.empty() )
  {
    setZMTypeFromSubGeometry( g, Qgis::WkbType::MultiCurve );
  }
  if ( is3D() && !g->is3D() )
    g->addZValue();
  else if ( !is3D() && g->is3D() )
    g->dropZValue();
  if ( isMeasure() && !g->isMeasure() )
    g->addMValue();
  else if ( !isMeasure() && g->isMeasure() )
    g->dropMValue();
 
  return QgsGeometryCollection::addGeometry( g );
}
 
bool QgsMultiCurve::addGeometries( const QVector<QgsAbstractGeometry *> &geometries )
{
  for ( QgsAbstractGeometry *g : geometries )
  {
    if ( !qgsgeometry_cast<QgsCurve *>( g ) )
    {
      qDeleteAll( geometries );
      return false;
    }
 
    //As it is a fresh type and not supported by other software, NurbsCurve not allowed in MultiCurves at the moment
    const Qgis::WkbType flatType = QgsWkbTypes::flatType( g->wkbType() );
    if ( !( flatType == Qgis::WkbType::LineString || flatType == Qgis::WkbType::CircularString || flatType == Qgis::WkbType::CompoundCurve ) )
    {
      qDeleteAll( geometries );
      return false;
    }
  }
 
  if ( mGeometries.empty() && !geometries.empty() )
  {
    setZMTypeFromSubGeometry( geometries.at( 0 ), Qgis::WkbType::MultiCurve );
  }
  mGeometries.reserve( mGeometries.size() + geometries.size() );
  for ( QgsAbstractGeometry *g : geometries )
  {
    if ( is3D() && !g->is3D() )
      g->addZValue();
    else if ( !is3D() && g->is3D() )
      g->dropZValue();
    if ( isMeasure() && !g->isMeasure() )
      g->addMValue();
    else if ( !isMeasure() && g->isMeasure() )
      g->dropMValue();
    mGeometries.append( g );
  }
 
  clearCache();
  return true;
}
 
bool QgsMultiCurve::insertGeometry( QgsAbstractGeometry *g, int index )
{
  if ( !g || !qgsgeometry_cast<QgsCurve *>( g ) )
  {
    delete g;
    return false;
  }
 
  //As it is a fresh type and not supported by other software, NurbsCurve not allowed in MultiCurves at the moment
  const Qgis::WkbType flatType = QgsWkbTypes::flatType( g->wkbType() );
  if ( !( flatType == Qgis::WkbType::LineString || flatType == Qgis::WkbType::CircularString || flatType == Qgis::WkbType::CompoundCurve ) )
  {
    delete g;
    return false;
  }
 
  return QgsGeometryCollection::insertGeometry( g, index );
}
 
QgsMultiCurve *QgsMultiCurve::simplifyByDistance( double tolerance ) const
{
  auto res = std::make_unique< QgsMultiCurve >();
  res->reserve( mGeometries.size() );
  for ( int i = 0; i < mGeometries.size(); ++i )
  {
    res->addGeometry( mGeometries.at( i )->simplifyByDistance( tolerance ) );
  }
  return res.release();
}
 
QgsMultiCurve *QgsMultiCurve::reversed() const
{
  QgsMultiCurve *reversedMultiCurve = new QgsMultiCurve();
  reversedMultiCurve->reserve( mGeometries.size() );
  for ( const QgsAbstractGeometry *geom : mGeometries )
  {
    if ( qgsgeometry_cast<const QgsCurve *>( geom ) )
    {
      reversedMultiCurve->addGeometry( static_cast<const QgsCurve *>( geom )->reversed() );
    }
  }
  return reversedMultiCurve;
}
 
QgsAbstractGeometry *QgsMultiCurve::boundary() const
{
  auto multiPoint = std::make_unique<QgsMultiPoint>();
  multiPoint->reserve( mGeometries.size() * 2 );
  for ( int i = 0; i < mGeometries.size(); ++i )
  {
    if ( QgsCurve *curve = qgsgeometry_cast<QgsCurve *>( mGeometries.at( i ) ) )
    {
      if ( !curve->isClosed() )
      {
        multiPoint->addGeometry( new QgsPoint( curve->startPoint() ) );
        multiPoint->addGeometry( new QgsPoint( curve->endPoint() ) );
      }
    }
  }
  if ( multiPoint->numGeometries() == 0 )
  {
    return nullptr;
  }
  return multiPoint.release();
}