Beispiel #1
0
bool QgsMemoryProvider::addAttributes( const QList<QgsField> &attributes )
{
  for ( QList<QgsField>::const_iterator it = attributes.begin(); it != attributes.end(); ++it )
  {
    switch ( it->type() )
    {
      case QVariant::Int:
      case QVariant::Double:
      case QVariant::String:
      case QVariant::Date:
      case QVariant::Time:
      case QVariant::DateTime:
      case QVariant::LongLong:
        break;
      default:
        QgsDebugMsg( "Field type not supported: " + it->typeName() );
        continue;
    }
    // add new field as a last one
    mFields.append( *it );

    for ( QgsFeatureMap::iterator fit = mFeatures.begin(); fit != mFeatures.end(); ++fit )
    {
      QgsFeature& f = fit.value();
      QgsAttributes attr = f.attributes();
      attr.append( QVariant() );
      f.setAttributes( attr );
    }
  }
  return true;
}
QgsVectorLayer *QgsFeatureSource::materialize( const QgsFeatureRequest &request, QgsFeedback *feedback )
{
  QgsWkbTypes::Type outWkbType = request.flags() & QgsFeatureRequest::NoGeometry ? QgsWkbTypes::NoGeometry : wkbType();
  QgsCoordinateReferenceSystem crs = request.destinationCrs().isValid() ? request.destinationCrs() : sourceCrs();

  QgsAttributeList requestedAttrs = request.subsetOfAttributes();

  QgsFields outFields;
  if ( request.flags() & QgsFeatureRequest::SubsetOfAttributes )
  {
    int i = 0;
    const QgsFields sourceFields = fields();
    for ( const QgsField &field : sourceFields )
    {
      if ( requestedAttrs.contains( i ) )
        outFields.append( field );
      i++;
    }
  }
  else
  {
    outFields = fields();
  }

  std::unique_ptr< QgsVectorLayer > layer( QgsMemoryProviderUtils::createMemoryLayer(
        sourceName(),
        outFields,
        outWkbType,
        crs ) );
  QgsFeature f;
  QgsFeatureIterator it = getFeatures( request );
  int fieldCount = fields().count();
  while ( it.nextFeature( f ) )
  {
    if ( feedback && feedback->isCanceled() )
      break;

    if ( request.flags() & QgsFeatureRequest::SubsetOfAttributes )
    {
      // remove unused attributes
      QgsAttributes attrs;
      for ( int i = 0; i < fieldCount; ++i )
      {
        if ( requestedAttrs.contains( i ) )
        {
          attrs.append( f.attributes().at( i ) );
        }
      }

      f.setAttributes( attrs );
    }

    layer->dataProvider()->addFeature( f, QgsFeatureSink::FastInsert );
  }

  return layer.release();
}
QVariantMap QgsJoinWithLinesAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
  if ( parameters.value( QStringLiteral( "SPOKES" ) ) == parameters.value( QStringLiteral( "HUBS" ) ) )
    throw QgsProcessingException( QObject::tr( "Same layer given for both hubs and spokes" ) );

  std::unique_ptr< QgsProcessingFeatureSource > hubSource( parameterAsSource( parameters, QStringLiteral( "HUBS" ), context ) );
  if ( !hubSource )
    throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "HUBS" ) ) );

  std::unique_ptr< QgsProcessingFeatureSource > spokeSource( parameterAsSource( parameters, QStringLiteral( "SPOKES" ), context ) );
  if ( !hubSource || !spokeSource )
    throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "SPOKES" ) ) );

  QString fieldHubName = parameterAsString( parameters, QStringLiteral( "HUB_FIELD" ), context );
  int fieldHubIndex = hubSource->fields().lookupField( fieldHubName );
  const QStringList hubFieldsToCopy = parameterAsFields( parameters, QStringLiteral( "HUB_FIELDS" ), context );

  QString fieldSpokeName = parameterAsString( parameters, QStringLiteral( "SPOKE_FIELD" ), context );
  int fieldSpokeIndex = spokeSource->fields().lookupField( fieldSpokeName );
  const QStringList spokeFieldsToCopy = parameterAsFields( parameters, QStringLiteral( "SPOKE_FIELDS" ), context );

  if ( fieldHubIndex < 0 || fieldSpokeIndex < 0 )
    throw QgsProcessingException( QObject::tr( "Invalid ID field" ) );

  const bool geodesic = parameterAsBool( parameters, QStringLiteral( "GEODESIC" ), context );
  const double geodesicDistance = parameterAsDouble( parameters, QStringLiteral( "GEODESIC_DISTANCE" ), context ) * 1000;
  bool dynamicGeodesicDistance = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "GEODESIC_DISTANCE" ) );
  QgsExpressionContext expressionContext = createExpressionContext( parameters, context, hubSource.get() );
  QgsProperty geodesicDistanceProperty;
  if ( dynamicGeodesicDistance )
  {
    geodesicDistanceProperty = parameters.value( QStringLiteral( "GEODESIC_DISTANCE" ) ).value< QgsProperty >();
  }

  const bool splitAntimeridian = parameterAsBool( parameters, QStringLiteral( "ANTIMERIDIAN_SPLIT" ), context );
  QgsDistanceArea da;
  da.setSourceCrs( hubSource->sourceCrs(), context.transformContext() );
  da.setEllipsoid( context.project()->ellipsoid() );

  QgsFields hubOutFields;
  QgsAttributeList hubFieldIndices;
  if ( hubFieldsToCopy.empty() )
  {
    hubOutFields = hubSource->fields();
    hubFieldIndices.reserve( hubOutFields.count() );
    for ( int i = 0; i < hubOutFields.count(); ++i )
    {
      hubFieldIndices << i;
    }
  }
  else
  {
    hubFieldIndices.reserve( hubOutFields.count() );
    for ( const QString &field : hubFieldsToCopy )
    {
      int index = hubSource->fields().lookupField( field );
      if ( index >= 0 )
      {
        hubFieldIndices << index;
        hubOutFields.append( hubSource->fields().at( index ) );
      }
    }
  }

  QgsAttributeList hubFields2Fetch = hubFieldIndices;
  hubFields2Fetch << fieldHubIndex;

  QgsFields spokeOutFields;
  QgsAttributeList spokeFieldIndices;
  if ( spokeFieldsToCopy.empty() )
  {
    spokeOutFields = spokeSource->fields();
    spokeFieldIndices.reserve( spokeOutFields.count() );
    for ( int i = 0; i < spokeOutFields.count(); ++i )
    {
      spokeFieldIndices << i;
    }
  }
  else
  {
    for ( const QString &field : spokeFieldsToCopy )
    {
      int index = spokeSource->fields().lookupField( field );
      if ( index >= 0 )
      {
        spokeFieldIndices << index;
        spokeOutFields.append( spokeSource->fields().at( index ) );
      }
    }
  }

  QgsAttributeList spokeFields2Fetch = spokeFieldIndices;
  spokeFields2Fetch << fieldSpokeIndex;


  QgsFields fields = QgsProcessingUtils::combineFields( hubOutFields, spokeOutFields );

  QgsWkbTypes::Type outType = geodesic ? QgsWkbTypes::MultiLineString : QgsWkbTypes::LineString;
  bool hasZ = false;
  if ( QgsWkbTypes::hasZ( hubSource->wkbType() ) || QgsWkbTypes::hasZ( spokeSource->wkbType() ) )
  {
    outType = QgsWkbTypes::addZ( outType );
    hasZ = true;
  }
  bool hasM = false;
  if ( QgsWkbTypes::hasM( hubSource->wkbType() ) || QgsWkbTypes::hasM( spokeSource->wkbType() ) )
  {
    outType = QgsWkbTypes::addM( outType );
    hasM = true;
  }

  QString dest;
  std::unique_ptr< QgsFeatureSink > sink( parameterAsSink( parameters, QStringLiteral( "OUTPUT" ), context, dest, fields,
                                          outType, hubSource->sourceCrs(), QgsFeatureSink::RegeneratePrimaryKey ) );
  if ( !sink )
    throw QgsProcessingException( invalidSinkError( parameters, QStringLiteral( "OUTPUT" ) ) );

  auto getPointFromFeature = [hasZ, hasM]( const QgsFeature & feature )->QgsPoint
  {
    QgsPoint p;
    if ( feature.geometry().type() == QgsWkbTypes::PointGeometry && !feature.geometry().isMultipart() )
      p = *static_cast< const QgsPoint *>( feature.geometry().constGet() );
    else
      p = *static_cast< const QgsPoint *>( feature.geometry().pointOnSurface().constGet() );
    if ( hasZ && !p.is3D() )
      p.addZValue( 0 );
    if ( hasM && !p.isMeasure() )
      p.addMValue( 0 );
    return p;
  };

  QgsFeatureIterator hubFeatures = hubSource->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( hubFields2Fetch ), QgsProcessingFeatureSource::FlagSkipGeometryValidityChecks );
  double step = hubSource->featureCount() > 0 ? 100.0 / hubSource->featureCount() : 1;
  int i = 0;
  QgsFeature hubFeature;
  while ( hubFeatures.nextFeature( hubFeature ) )
  {
    i++;
    if ( feedback->isCanceled() )
    {
      break;
    }

    feedback->setProgress( i * step );

    if ( !hubFeature.hasGeometry() )
      continue;

    QgsPoint hubPoint = getPointFromFeature( hubFeature );

    // only keep selected attributes
    QgsAttributes hubAttributes;
    for ( int j = 0; j < hubFeature.attributes().count(); ++j )
    {
      if ( !hubFieldIndices.contains( j ) )
        continue;
      hubAttributes << hubFeature.attribute( j );
    }

    QgsFeatureRequest spokeRequest = QgsFeatureRequest().setDestinationCrs( hubSource->sourceCrs(), context.transformContext() );
    spokeRequest.setSubsetOfAttributes( spokeFields2Fetch );
    spokeRequest.setFilterExpression( QgsExpression::createFieldEqualityExpression( fieldSpokeName, hubFeature.attribute( fieldHubIndex ) ) );

    QgsFeatureIterator spokeFeatures = spokeSource->getFeatures( spokeRequest, QgsProcessingFeatureSource::FlagSkipGeometryValidityChecks );
    QgsFeature spokeFeature;
    while ( spokeFeatures.nextFeature( spokeFeature ) )
    {
      if ( feedback->isCanceled() )
      {
        break;
      }
      if ( !spokeFeature.hasGeometry() )
        continue;

      QgsPoint spokePoint = getPointFromFeature( spokeFeature );
      QgsGeometry line;
      if ( !geodesic )
      {
        line = QgsGeometry( new QgsLineString( QVector< QgsPoint >() << hubPoint << spokePoint ) );
        if ( splitAntimeridian )
          line = da.splitGeometryAtAntimeridian( line );
      }
      else
      {
        double distance = geodesicDistance;
        if ( dynamicGeodesicDistance )
        {
          expressionContext.setFeature( hubFeature );
          distance = geodesicDistanceProperty.valueAsDouble( expressionContext, distance );
        }

        std::unique_ptr< QgsMultiLineString > ml = qgis::make_unique< QgsMultiLineString >();
        std::unique_ptr< QgsLineString > l = qgis::make_unique< QgsLineString >( QVector< QgsPoint >() << hubPoint );
        QVector< QVector< QgsPointXY > > points = da.geodesicLine( QgsPointXY( hubPoint ), QgsPointXY( spokePoint ), distance, splitAntimeridian );
        QVector< QgsPointXY > points1 = points.at( 0 );
        points1.pop_front();
        if ( points.count() == 1 )
          points1.pop_back();

        QgsLineString geodesicPoints( points1 );
        l->append( &geodesicPoints );
        if ( points.count() == 1 )
          l->addVertex( spokePoint );

        ml->addGeometry( l.release() );
        if ( points.count() > 1 )
        {
          QVector< QgsPointXY > points2 = points.at( 1 );
          points2.pop_back();
          l = qgis::make_unique< QgsLineString >( points2 );
          if ( hasZ )
            l->addZValue( std::numeric_limits<double>::quiet_NaN() );
          if ( hasM )
            l->addMValue( std::numeric_limits<double>::quiet_NaN() );

          l->addVertex( spokePoint );
          ml->addGeometry( l.release() );
        }
        line = QgsGeometry( std::move( ml ) );
      }

      QgsFeature outFeature;
      QgsAttributes outAttributes = hubAttributes;

      // only keep selected attributes
      QgsAttributes spokeAttributes;
      for ( int j = 0; j < spokeFeature.attributes().count(); ++j )
      {
        if ( !spokeFieldIndices.contains( j ) )
          continue;
        spokeAttributes << spokeFeature.attribute( j );
      }

      outAttributes.append( spokeAttributes );
      outFeature.setAttributes( outAttributes );
      outFeature.setGeometry( line );
      sink->addFeature( outFeature, QgsFeatureSink::FastInsert );
    }
  }

  QVariantMap outputs;
  outputs.insert( QStringLiteral( "OUTPUT" ), dest );
  return outputs;
}
QVariantMap QgsLineIntersectionAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
  std::unique_ptr< QgsFeatureSource > sourceA( parameterAsSource( parameters, QStringLiteral( "INPUT" ), context ) );
  if ( !sourceA )
    throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "INPUT" ) ) );

  std::unique_ptr< QgsFeatureSource > sourceB( parameterAsSource( parameters, QStringLiteral( "INTERSECT" ), context ) );
  if ( !sourceB )
    throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "INTERSECT" ) ) );

  const QStringList fieldsA = parameterAsFields( parameters, QStringLiteral( "INPUT_FIELDS" ), context );
  const QStringList fieldsB = parameterAsFields( parameters, QStringLiteral( "INTERSECT_FIELDS" ), context );

  QgsAttributeList fieldIndicesA = QgsProcessingUtils::fieldNamesToIndices( fieldsA, sourceA->fields() );
  QgsAttributeList fieldIndicesB = QgsProcessingUtils::fieldNamesToIndices( fieldsB, sourceB->fields() );

  QString intersectFieldsPrefix = parameterAsString( parameters, QStringLiteral( "INTERSECT_FIELDS_PREFIX" ), context );
  QgsFields outFields = QgsProcessingUtils::combineFields(
                          QgsProcessingUtils::indicesToFields( fieldIndicesA, sourceA->fields() ),
                          QgsProcessingUtils::indicesToFields( fieldIndicesB, sourceB->fields() ),
                          intersectFieldsPrefix );

  QString dest;
  std::unique_ptr< QgsFeatureSink > sink( parameterAsSink( parameters, QStringLiteral( "OUTPUT" ), context, dest, outFields, QgsWkbTypes::Point,  sourceA->sourceCrs(), QgsFeatureSink::RegeneratePrimaryKey ) );
  if ( !sink )
    throw QgsProcessingException( invalidSinkError( parameters, QStringLiteral( "OUTPUT" ) ) );

  QgsSpatialIndex spatialIndex( sourceB->getFeatures( QgsFeatureRequest().setNoAttributes().setDestinationCrs( sourceA->sourceCrs(), context.transformContext() ) ), feedback );
  QgsFeature outFeature;
  QgsFeatureIterator features = sourceA->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( fieldIndicesA ) );
  double step = sourceA->featureCount() > 0 ? 100.0 / sourceA->featureCount() : 1;
  int i = 0;
  QgsFeature inFeatureA;
  while ( features.nextFeature( inFeatureA ) )
  {
    i++;
    if ( feedback->isCanceled() )
    {
      break;
    }

    if ( !inFeatureA.hasGeometry() )
      continue;

    QgsGeometry inGeom = inFeatureA.geometry();
    QgsFeatureIds lines = spatialIndex.intersects( inGeom.boundingBox() ).toSet();
    if ( !lines.empty() )
    {
      // use prepared geometries for faster intersection tests
      std::unique_ptr< QgsGeometryEngine > engine( QgsGeometry::createGeometryEngine( inGeom.constGet() ) );
      engine->prepareGeometry();

      QgsFeatureRequest request = QgsFeatureRequest().setFilterFids( lines );
      request.setDestinationCrs( sourceA->sourceCrs(), context.transformContext() );
      request.setSubsetOfAttributes( fieldIndicesB );

      QgsFeature inFeatureB;
      QgsFeatureIterator featuresB = sourceB->getFeatures( request );
      while ( featuresB.nextFeature( inFeatureB ) )
      {
        if ( feedback->isCanceled() )
        {
          break;
        }

        QgsGeometry tmpGeom = inFeatureB.geometry();
        if ( engine->intersects( tmpGeom.constGet() ) )
        {
          QgsMultiPointXY points;
          QgsGeometry intersectGeom = inGeom.intersection( tmpGeom );
          QgsAttributes outAttributes;
          for ( int a : qgis::as_const( fieldIndicesA ) )
          {
            outAttributes.append( inFeatureA.attribute( a ) );
          }
          for ( int b : qgis::as_const( fieldIndicesB ) )
          {
            outAttributes.append( inFeatureB.attribute( b ) );
          }
          if ( QgsWkbTypes::flatType( intersectGeom.wkbType() ) == QgsWkbTypes::GeometryCollection )
          {
            const QVector<QgsGeometry> geomCollection = intersectGeom.asGeometryCollection();
            for ( const QgsGeometry &part : geomCollection )
            {
              if ( part.type() == QgsWkbTypes::PointGeometry )
              {
                if ( part.isMultipart() )
                {
                  points = part.asMultiPoint();
                }
                else
                {
                  points.append( part.asPoint() );
                }
              }
            }
          }
          else if ( intersectGeom.type() == QgsWkbTypes::PointGeometry )
          {
            if ( intersectGeom.isMultipart() )
            {
              points = intersectGeom.asMultiPoint();
            }
            else
            {
              points.append( intersectGeom.asPoint() );
            }
          }
          for ( const QgsPointXY &j : qgis::as_const( points ) )
          {
            outFeature.setGeometry( QgsGeometry::fromPointXY( j ) );
            outFeature.setAttributes( outAttributes );
            sink->addFeature( outFeature, QgsFeatureSink::FastInsert );
          }
        }
      }
    }

    feedback->setProgress( i * step );

  }

  QVariantMap outputs;
  outputs.insert( QStringLiteral( "OUTPUT" ), dest );
  return outputs;
}
QVariantMap QgsShortestPathPointToLayerAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
  loadCommonParams( parameters, context, feedback );

  QgsPointXY startPoint = parameterAsPoint( parameters, QStringLiteral( "START_POINT" ), context, mNetwork->sourceCrs() );

  std::unique_ptr< QgsFeatureSource > endPoints( parameterAsSource( parameters, QStringLiteral( "END_POINTS" ), context ) );
  if ( !endPoints )
    throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "END_POINTS" ) ) );

  QgsFields fields = endPoints->fields();
  fields.append( QgsField( QStringLiteral( "start" ), QVariant::String ) );
  fields.append( QgsField( QStringLiteral( "end" ), QVariant::String ) );
  fields.append( QgsField( QStringLiteral( "cost" ), QVariant::Double ) );

  QString dest;
  std::unique_ptr< QgsFeatureSink > sink( parameterAsSink( parameters, QStringLiteral( "OUTPUT" ), context, dest, fields, QgsWkbTypes::LineString, mNetwork->sourceCrs() ) );
  if ( !sink )
    throw QgsProcessingException( invalidSinkError( parameters, QStringLiteral( "OUTPUT" ) ) );

  QVector< QgsPointXY > points;
  points.push_front( startPoint );
  QHash< int, QgsAttributes > sourceAttributes;
  loadPoints( endPoints.get(), points, sourceAttributes, context, feedback );

  feedback->pushInfo( QObject::tr( "Building graph…" ) );
  QVector< QgsPointXY > snappedPoints;
  mDirector->makeGraph( mBuilder.get(), points, snappedPoints, feedback );

  feedback->pushInfo( QObject::tr( "Calculating shortest paths…" ) );
  QgsGraph *graph = mBuilder->graph();
  int idxStart = graph->findVertex( snappedPoints[0] );
  int idxEnd;

  QVector< int > tree;
  QVector< double > costs;
  QgsGraphAnalyzer::dijkstra( graph, idxStart, 0, &tree, &costs );

  QVector<QgsPointXY> route;
  double cost;

  QgsFeature feat;
  feat.setFields( fields );
  QgsAttributes attributes;

  int step =  points.size() > 0 ? 100.0 / points.size() : 1;
  for ( int i = 1; i < points.size(); i++ )
  {
    if ( feedback->isCanceled() )
    {
      break;
    }

    idxEnd = graph->findVertex( snappedPoints[i] );
    if ( tree.at( idxEnd ) == -1 )
    {
      feedback->reportError( QObject::tr( "There is no route from start point (%1) to end point (%2)." )
                             .arg( startPoint.toString(),
                                   points[i].toString() ) );
      feat.clearGeometry();
      attributes = sourceAttributes.value( i );
      attributes.append( QVariant() );
      attributes.append( points[i].toString() );
      feat.setAttributes( attributes );
      sink->addFeature( feat, QgsFeatureSink::FastInsert );
      continue;
    }

    route.clear();
    route.push_front( graph->vertex( idxEnd ).point() );
    cost = costs.at( idxEnd );
    while ( idxEnd != idxStart )
    {
      idxEnd = graph->edge( tree.at( idxEnd ) ).fromVertex();
      route.push_front( graph->vertex( idxEnd ).point() );
    }

    QgsGeometry geom = QgsGeometry::fromPolylineXY( route );
    QgsFeature feat;
    feat.setFields( fields );
    attributes = sourceAttributes.value( i );
    attributes.append( startPoint.toString() );
    attributes.append( points[i].toString() );
    attributes.append( cost / mMultiplier );
    feat.setAttributes( attributes );
    feat.setGeometry( geom );
    sink->addFeature( feat, QgsFeatureSink::FastInsert );

    feedback->setProgress( i * step );
  }

  QVariantMap outputs;
  outputs.insert( QStringLiteral( "OUTPUT" ), dest );
  return outputs;
}
QVariantMap QgsJoinWithLinesAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
  if ( parameters.value( QStringLiteral( "SPOKES" ) ) == parameters.value( QStringLiteral( "HUBS" ) ) )
    throw QgsProcessingException( QObject::tr( "Same layer given for both hubs and spokes" ) );

  std::unique_ptr< QgsFeatureSource > hubSource( parameterAsSource( parameters, QStringLiteral( "HUBS" ), context ) );
  std::unique_ptr< QgsFeatureSource > spokeSource( parameterAsSource( parameters, QStringLiteral( "SPOKES" ), context ) );
  if ( !hubSource || !spokeSource )
    return QVariantMap();

  QString fieldHubName = parameterAsString( parameters, QStringLiteral( "HUB_FIELD" ), context );
  int fieldHubIndex = hubSource->fields().lookupField( fieldHubName );
  const QStringList hubFieldsToCopy = parameterAsFields( parameters, QStringLiteral( "HUB_FIELDS" ), context );

  QString fieldSpokeName = parameterAsString( parameters, QStringLiteral( "SPOKE_FIELD" ), context );
  int fieldSpokeIndex = spokeSource->fields().lookupField( fieldSpokeName );
  const QStringList spokeFieldsToCopy = parameterAsFields( parameters, QStringLiteral( "SPOKE_FIELDS" ), context );

  if ( fieldHubIndex < 0 || fieldSpokeIndex < 0 )
    throw QgsProcessingException( QObject::tr( "Invalid ID field" ) );

  QgsFields hubOutFields;
  QgsAttributeList hubFieldIndices;
  if ( hubFieldsToCopy.empty() )
  {
    hubOutFields = hubSource->fields();
    for ( int i = 0; i < hubOutFields.count(); ++i )
    {
      hubFieldIndices << i;
    }
  }
  else
  {
    for ( const QString &field : hubFieldsToCopy )
    {
      int index = hubSource->fields().lookupField( field );
      if ( index >= 0 )
      {
        hubFieldIndices << index;
        hubOutFields.append( hubSource->fields().at( index ) );
      }
    }
  }

  QgsAttributeList hubFields2Fetch = hubFieldIndices;
  hubFields2Fetch << fieldHubIndex;

  QgsFields spokeOutFields;
  QgsAttributeList spokeFieldIndices;
  if ( spokeFieldsToCopy.empty() )
  {
    spokeOutFields = spokeSource->fields();
    for ( int i = 0; i < spokeOutFields.count(); ++i )
    {
      spokeFieldIndices << i;
    }
  }
  else
  {
    for ( const QString &field : spokeFieldsToCopy )
    {
      int index = spokeSource->fields().lookupField( field );
      if ( index >= 0 )
      {
        spokeFieldIndices << index;
        spokeOutFields.append( spokeSource->fields().at( index ) );
      }
    }
  }

  QgsAttributeList spokeFields2Fetch = spokeFieldIndices;
  spokeFields2Fetch << fieldSpokeIndex;


  QgsFields fields = QgsProcessingUtils::combineFields( hubOutFields, spokeOutFields );

  QgsWkbTypes::Type outType = QgsWkbTypes::LineString;
  bool hasZ = false;
  if ( QgsWkbTypes::hasZ( hubSource->wkbType() ) || QgsWkbTypes::hasZ( spokeSource->wkbType() ) )
  {
    outType = QgsWkbTypes::addZ( outType );
    hasZ = true;
  }
  bool hasM = false;
  if ( QgsWkbTypes::hasM( hubSource->wkbType() ) || QgsWkbTypes::hasM( spokeSource->wkbType() ) )
  {
    outType = QgsWkbTypes::addM( outType );
    hasM = true;
  }

  QString dest;
  std::unique_ptr< QgsFeatureSink > sink( parameterAsSink( parameters, QStringLiteral( "OUTPUT" ), context, dest, fields,
                                          outType, hubSource->sourceCrs() ) );
  if ( !sink )
    return QVariantMap();

  auto getPointFromFeature = [hasZ, hasM]( const QgsFeature & feature )->QgsPoint
  {
    QgsPoint p;
    if ( feature.geometry().type() == QgsWkbTypes::PointGeometry && !feature.geometry().isMultipart() )
      p = *static_cast< const QgsPoint *>( feature.geometry().constGet() );
    else
      p = *static_cast< const QgsPoint *>( feature.geometry().pointOnSurface().constGet() );
    if ( hasZ && !p.is3D() )
      p.addZValue( 0 );
    if ( hasM && !p.isMeasure() )
      p.addMValue( 0 );
    return p;
  };

  QgsFeatureIterator hubFeatures = hubSource->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( hubFields2Fetch ) );
  double step = hubSource->featureCount() > 0 ? 100.0 / hubSource->featureCount() : 1;
  int i = 0;
  QgsFeature hubFeature;
  while ( hubFeatures.nextFeature( hubFeature ) )
  {
    i++;
    if ( feedback->isCanceled() )
    {
      break;
    }

    feedback->setProgress( i * step );

    if ( !hubFeature.hasGeometry() )
      continue;

    QgsPoint hubPoint = getPointFromFeature( hubFeature );

    // only keep selected attributes
    QgsAttributes hubAttributes;
    for ( int j = 0; j < hubFeature.attributes().count(); ++j )
    {
      if ( !hubFieldIndices.contains( j ) )
        continue;
      hubAttributes << hubFeature.attribute( j );
    }

    QgsFeatureRequest spokeRequest = QgsFeatureRequest().setDestinationCrs( hubSource->sourceCrs(), context.transformContext() );
    spokeRequest.setSubsetOfAttributes( spokeFields2Fetch );
    spokeRequest.setFilterExpression( QgsExpression::createFieldEqualityExpression( fieldSpokeName, hubFeature.attribute( fieldHubIndex ) ) );

    QgsFeatureIterator spokeFeatures = spokeSource->getFeatures( spokeRequest );
    QgsFeature spokeFeature;
    while ( spokeFeatures.nextFeature( spokeFeature ) )
    {
      if ( feedback->isCanceled() )
      {
        break;
      }
      if ( !spokeFeature.hasGeometry() )
        continue;

      QgsPoint spokePoint = getPointFromFeature( spokeFeature );
      QgsGeometry line( new QgsLineString( QVector< QgsPoint >() << hubPoint << spokePoint ) );

      QgsFeature outFeature;
      QgsAttributes outAttributes = hubAttributes;

      // only keep selected attributes
      QgsAttributes spokeAttributes;
      for ( int j = 0; j < spokeFeature.attributes().count(); ++j )
      {
        if ( !spokeFieldIndices.contains( j ) )
          continue;
        spokeAttributes << spokeFeature.attribute( j );
      }

      outAttributes.append( spokeAttributes );
      outFeature.setAttributes( outAttributes );
      outFeature.setGeometry( line );
      sink->addFeature( outFeature, QgsFeatureSink::FastInsert );
    }
  }

  QVariantMap outputs;
  outputs.insert( QStringLiteral( "OUTPUT" ), dest );
  return outputs;
}
Beispiel #7
0
QgsRasterIdentifyResult QgsAmsProvider::identify( const QgsPointXY &point, QgsRaster::IdentifyFormat format, const QgsRectangle &extent, int width, int height, int dpi )
{
  // http://resources.arcgis.com/en/help/rest/apiref/identify.html
  QgsDataSourceUri dataSource( dataSourceUri() );
  QUrl queryUrl( dataSource.param( QStringLiteral( "url" ) ) + "/identify" );
  queryUrl.addQueryItem( QStringLiteral( "f" ), QStringLiteral( "json" ) );
  queryUrl.addQueryItem( QStringLiteral( "geometryType" ), QStringLiteral( "esriGeometryPoint" ) );
  queryUrl.addQueryItem( QStringLiteral( "geometry" ), QStringLiteral( "{x: %1, y: %2}" ).arg( point.x(), 0, 'f' ).arg( point.y(), 0, 'f' ) );
//  queryUrl.addQueryItem( "sr", mCrs.postgisSrid() );
  queryUrl.addQueryItem( QStringLiteral( "layers" ), QStringLiteral( "all:%1" ).arg( dataSource.param( QStringLiteral( "layer" ) ) ) );
  queryUrl.addQueryItem( QStringLiteral( "imageDisplay" ), QStringLiteral( "%1,%2,%3" ).arg( width ).arg( height ).arg( dpi ) );
  queryUrl.addQueryItem( QStringLiteral( "mapExtent" ), QStringLiteral( "%1,%2,%3,%4" ).arg( extent.xMinimum(), 0, 'f' ).arg( extent.yMinimum(), 0, 'f' ).arg( extent.xMaximum(), 0, 'f' ).arg( extent.yMaximum(), 0, 'f' ) );
  queryUrl.addQueryItem( QStringLiteral( "tolerance" ), QStringLiteral( "10" ) );

  const QString authcfg = dataSource.param( QStringLiteral( "authcfg" ) );
  const QVariantList queryResults = QgsArcGisRestUtils::queryServiceJSON( queryUrl, authcfg, mErrorTitle, mError ).value( QStringLiteral( "results" ) ).toList();

  QMap<int, QVariant> entries;

  if ( format == QgsRaster::IdentifyFormatText )
  {
    for ( const QVariant &result : queryResults )
    {
      const QVariantMap resultMap = result.toMap();
      QVariantMap attributesMap = resultMap[QStringLiteral( "attributes" )].toMap();
      QString valueStr;
      for ( auto it = attributesMap.constBegin(); it != attributesMap.constEnd(); ++it )
      {
        valueStr += QStringLiteral( "%1 = %2\n" ).arg( it.key(), it.value().toString() );
      }
      entries.insert( entries.size(), valueStr );
    }
  }
  else if ( format == QgsRaster::IdentifyFormatFeature )
  {
    for ( const QVariant &result : queryResults )
    {
      const QVariantMap resultMap = result.toMap();

      QgsFields fields;
      const QVariantMap attributesMap = resultMap[QStringLiteral( "attributes" )].toMap();
      QgsAttributes featureAttributes;
      for ( auto it = attributesMap.constBegin(); it != attributesMap.constEnd(); ++it )
      {
        fields.append( QgsField( it.key(), QVariant::String, QStringLiteral( "string" ) ) );
        featureAttributes.append( it.value().toString() );
      }
      QgsCoordinateReferenceSystem crs;
      std::unique_ptr< QgsAbstractGeometry > geometry = QgsArcGisRestUtils::parseEsriGeoJSON( resultMap[QStringLiteral( "geometry" )].toMap(), resultMap[QStringLiteral( "geometryType" )].toString(), false, false, &crs );
      QgsFeature feature( fields );
      feature.setGeometry( QgsGeometry( std::move( geometry ) ) );
      feature.setAttributes( featureAttributes );
      feature.setValid( true );
      QgsFeatureStore store( fields, crs );
      QMap<QString, QVariant> params;
      params[QStringLiteral( "sublayer" )] = resultMap[QStringLiteral( "layerName" )].toString();
      params[QStringLiteral( "featureType" )] = attributesMap[resultMap[QStringLiteral( "displayFieldName" )].toString()].toString();
      store.setParams( params );
      store.addFeature( feature );
      entries.insert( entries.size(), qVariantFromValue( QList<QgsFeatureStore>() << store ) );
    }
  }
  return QgsRasterIdentifyResult( format, entries );
}