qgsalgorithmtranslate.cpp

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/***************************************************************************
                         qgsalgorithmtranslate.cpp
                         ---------------------
    begin                : November 2017
    copyright            : (C) 2017 by Nyall Dawson
    email                : nyall dot dawson 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 "qgsalgorithmtranslate.h"
#include "qgsvectorlayer.h"
 
 
QString QgsTranslateAlgorithm::name() const
{
  return QStringLiteral( "translategeometry" );
}
 
QString QgsTranslateAlgorithm::displayName() const
{
  return QObject::tr( "Translate" );
}
 
QStringList QgsTranslateAlgorithm::tags() const
{
  return QObject::tr( "move,shift,transform,z,m,values,add" ).split( ',' );
}
 
QString QgsTranslateAlgorithm::group() const
{
  return QObject::tr( "Vector geometry" );
}
 
QString QgsTranslateAlgorithm::groupId() const
{
  return QStringLiteral( "vectorgeometry" );
}
 
QString QgsTranslateAlgorithm::outputName() const
{
  return QObject::tr( "Translated" );
}
 
QString QgsTranslateAlgorithm::shortHelpString() const
{
  return QObject::tr( "This algorithm moves the geometries within a layer, by offsetting them with a specified x and y displacement." )
         + QStringLiteral( "\n\n" )
         + QObject::tr( "Z and M values present in the geometry can also be translated." );
}
 
QString QgsTranslateAlgorithm::shortDescription() const
{
  return QObject::tr( "Moves the geometries within a layer, by offsetting them with a specified x, y, z or m displacement." );
}
 
QgsTranslateAlgorithm *QgsTranslateAlgorithm::createInstance() const
{
  return new QgsTranslateAlgorithm();
}
 
void QgsTranslateAlgorithm::initParameters( const QVariantMap & )
{
  auto xOffset = std::make_unique<QgsProcessingParameterDistance>( QStringLiteral( "DELTA_X" ), QObject::tr( "Offset distance (x-axis)" ), 0.0, QStringLiteral( "INPUT" ) );
  xOffset->setIsDynamic( true );
  xOffset->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "DELTA_X" ), QObject::tr( "Offset distance (x-axis)" ), QgsPropertyDefinition::Double ) );
  xOffset->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
  addParameter( xOffset.release() );
 
  auto yOffset = std::make_unique<QgsProcessingParameterDistance>( QStringLiteral( "DELTA_Y" ), QObject::tr( "Offset distance (y-axis)" ), 0.0, QStringLiteral( "INPUT" ) );
  yOffset->setIsDynamic( true );
  yOffset->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "DELTA_Y" ), QObject::tr( "Offset distance (y-axis)" ), QgsPropertyDefinition::Double ) );
  yOffset->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
  addParameter( yOffset.release() );
 
  auto zOffset = std::make_unique<QgsProcessingParameterNumber>( QStringLiteral( "DELTA_Z" ), QObject::tr( "Offset distance (z-axis)" ), Qgis::ProcessingNumberParameterType::Double, 0.0 );
  zOffset->setIsDynamic( true );
  zOffset->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "DELTA_Z" ), QObject::tr( "Offset distance (z-axis)" ), QgsPropertyDefinition::Double ) );
  zOffset->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
  addParameter( zOffset.release() );
 
  auto mOffset = std::make_unique<QgsProcessingParameterNumber>( QStringLiteral( "DELTA_M" ), QObject::tr( "Offset distance (m values)" ), Qgis::ProcessingNumberParameterType::Double, 0.0 );
  mOffset->setIsDynamic( true );
  mOffset->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "DELTA_M" ), QObject::tr( "Offset distance (m values)" ), QgsPropertyDefinition::Double ) );
  mOffset->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
  addParameter( mOffset.release() );
}
 
bool QgsTranslateAlgorithm::prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
{
  mDeltaX = parameterAsDouble( parameters, QStringLiteral( "DELTA_X" ), context );
  mDynamicDeltaX = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "DELTA_X" ) );
  if ( mDynamicDeltaX )
    mDeltaXProperty = parameters.value( QStringLiteral( "DELTA_X" ) ).value<QgsProperty>();
 
  mDeltaY = parameterAsDouble( parameters, QStringLiteral( "DELTA_Y" ), context );
  mDynamicDeltaY = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "DELTA_Y" ) );
  if ( mDynamicDeltaY )
    mDeltaYProperty = parameters.value( QStringLiteral( "DELTA_Y" ) ).value<QgsProperty>();
 
  mDeltaZ = parameterAsDouble( parameters, QStringLiteral( "DELTA_Z" ), context );
  mDynamicDeltaZ = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "DELTA_Z" ) );
  if ( mDynamicDeltaZ )
    mDeltaZProperty = parameters.value( QStringLiteral( "DELTA_Z" ) ).value<QgsProperty>();
 
  mDeltaM = parameterAsDouble( parameters, QStringLiteral( "DELTA_M" ), context );
  mDynamicDeltaM = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "DELTA_M" ) );
  if ( mDynamicDeltaM )
    mDeltaMProperty = parameters.value( QStringLiteral( "DELTA_M" ) ).value<QgsProperty>();
 
  return true;
}
 
QgsFeatureList QgsTranslateAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback * )
{
  QgsFeature f = feature;
  if ( f.hasGeometry() )
  {
    QgsGeometry geometry = f.geometry();
 
    double deltaX = mDeltaX;
    if ( mDynamicDeltaX )
      deltaX = mDeltaXProperty.valueAsDouble( context.expressionContext(), deltaX );
    double deltaY = mDeltaY;
    if ( mDynamicDeltaY )
      deltaY = mDeltaYProperty.valueAsDouble( context.expressionContext(), deltaY );
    double deltaZ = mDeltaZ;
    if ( mDynamicDeltaZ )
      deltaZ = mDeltaZProperty.valueAsDouble( context.expressionContext(), deltaZ );
    double deltaM = mDeltaM;
    if ( mDynamicDeltaM )
      deltaM = mDeltaMProperty.valueAsDouble( context.expressionContext(), deltaM );
 
    if ( deltaZ != 0.0 && !geometry.constGet()->is3D() )
      geometry.get()->addZValue( 0 );
    if ( deltaM != 0.0 && !geometry.constGet()->isMeasure() )
      geometry.get()->addMValue( 0 );
 
    geometry.translate( deltaX, deltaY, deltaZ, deltaM );
    f.setGeometry( geometry );
  }
  return QgsFeatureList() << f;
}
 
Qgis::WkbType QgsTranslateAlgorithm::outputWkbType( Qgis::WkbType inputWkbType ) const
{
  Qgis::WkbType wkb = inputWkbType;
  if ( mDynamicDeltaZ || mDeltaZ != 0.0 )
    wkb = QgsWkbTypes::addZ( wkb );
  if ( mDynamicDeltaM || mDeltaM != 0.0 )
    wkb = QgsWkbTypes::addM( wkb );
  return wkb;
}
 
bool QgsTranslateAlgorithm::supportInPlaceEdit( const QgsMapLayer *l ) const
{
  const QgsVectorLayer *layer = qobject_cast<const QgsVectorLayer *>( l );
  if ( !layer )
    return false;
 
  if ( !QgsProcessingFeatureBasedAlgorithm::supportInPlaceEdit( layer ) )
    return false;
 
  // Check if we can drop Z/M and still have some work done
  if ( mDeltaX != 0.0 || mDeltaY != 0.0 )
    return true;
 
  // If the type differs there is no sense in executing the algorithm and drop the result
  const Qgis::WkbType inPlaceWkbType = layer->wkbType();
  return inPlaceWkbType == outputWkbType( inPlaceWkbType );
}