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qgsalgorithmconverttocurves.cpp
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qgsalgorithmconverttocurves.cpp
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/***************************************************************************
qgsalgorithmconverttocurves.cpp
---------------------
begin : March 2018
copyright : (C) 2018 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 "qgsalgorithmconverttocurves.h"
///@cond PRIVATE
QString QgsConvertToCurvesAlgorithm::name() const
{
return QStringLiteral( "converttocurves" );
}
QString QgsConvertToCurvesAlgorithm::displayName() const
{
return QObject::tr( "Convert to curved geometries" );
}
QStringList QgsConvertToCurvesAlgorithm::tags() const
{
return QObject::tr( "straight,segmentize,curves,curved,circular" ).split( ',' );
}
QString QgsConvertToCurvesAlgorithm::group() const
{
return QObject::tr( "Vector geometry" );
}
QString QgsConvertToCurvesAlgorithm::groupId() const
{
return QStringLiteral( "vectorgeometry" );
}
QString QgsConvertToCurvesAlgorithm::outputName() const
{
return QObject::tr( "Curves" );
}
QString QgsConvertToCurvesAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm converts a geometry into its curved geometry equivalent.\n\n"
"Already curved geometries will be retained without change." );
}
QgsConvertToCurvesAlgorithm *QgsConvertToCurvesAlgorithm::createInstance() const
{
return new QgsConvertToCurvesAlgorithm();
}
QList<int> QgsConvertToCurvesAlgorithm::inputLayerTypes() const
{
return QList<int>() << QgsProcessing::TypeVectorLine << QgsProcessing::TypeVectorPolygon;
}
void QgsConvertToCurvesAlgorithm::initParameters( const QVariantMap & )
{
std::unique_ptr< QgsProcessingParameterNumber > tolerance = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "DISTANCE" ),
QObject::tr( "Maximum distance tolerance" ), QgsProcessingParameterNumber::Double,
0.000001, false, 0, 10000000.0 );
tolerance->setIsDynamic( true );
tolerance->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "DISTANCE" ), QObject::tr( "Maximum distance tolerance" ), QgsPropertyDefinition::DoublePositive ) );
tolerance->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
addParameter( tolerance.release() );
std::unique_ptr< QgsProcessingParameterNumber > angleTolerance = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "ANGLE" ),
QObject::tr( "Maximum angle tolerance" ), QgsProcessingParameterNumber::Double,
0.000001, false, 0, 45.0 );
angleTolerance->setIsDynamic( true );
angleTolerance->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "ANGLE" ), QObject::tr( "Maximum angle tolerance" ), QgsPropertyDefinition::DoublePositive ) );
angleTolerance->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
addParameter( angleTolerance.release() );
}
bool QgsConvertToCurvesAlgorithm::prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * )
{
mTolerance = parameterAsDouble( parameters, QStringLiteral( "DISTANCE" ), context );
mDynamicTolerance = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "DISTANCE" ) );
if ( mDynamicTolerance )
mToleranceProperty = parameters.value( QStringLiteral( "DISTANCE" ) ).value< QgsProperty >();
mAngleTolerance = parameterAsDouble( parameters, QStringLiteral( "ANGLE" ), context );
mDynamicAngleTolerance = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "ANGLE" ) );
if ( mDynamicAngleTolerance )
mAngleToleranceProperty = parameters.value( QStringLiteral( "ANGLE" ) ).value< QgsProperty >();
return true;
}
QgsFeatureList QgsConvertToCurvesAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback * )
{
QgsFeature f = feature;
if ( f.hasGeometry() )
{
QgsGeometry geometry = f.geometry();
double tolerance = mTolerance;
if ( mDynamicTolerance )
tolerance = mToleranceProperty.valueAsDouble( context.expressionContext(), tolerance );
double angleTolerance = mAngleTolerance;
if ( mDynamicAngleTolerance )
angleTolerance = mAngleToleranceProperty.valueAsDouble( context.expressionContext(), angleTolerance );
f.setGeometry( geometry.convertToCurves( tolerance, angleTolerance * M_PI / 180.0 ) );
}
return QgsFeatureList() << f;
}
QgsWkbTypes::Type QgsConvertToCurvesAlgorithm::outputWkbType( QgsWkbTypes::Type inputWkbType ) const
{
if ( QgsWkbTypes::isCurvedType( inputWkbType ) )
return inputWkbType;
QgsWkbTypes::Type outType = QgsWkbTypes::Unknown;
switch ( QgsWkbTypes::geometryType( inputWkbType ) )
{
case QgsWkbTypes::PointGeometry:
case QgsWkbTypes::NullGeometry:
case QgsWkbTypes::UnknownGeometry:
return inputWkbType;
case QgsWkbTypes::LineGeometry:
outType = QgsWkbTypes::CompoundCurve;
break;
case QgsWkbTypes::PolygonGeometry:
outType = QgsWkbTypes::CurvePolygon;
break;
}
if ( QgsWkbTypes::isMultiType( inputWkbType ) )
outType = QgsWkbTypes::multiType( outType );
if ( QgsWkbTypes::hasZ( inputWkbType ) )
outType = QgsWkbTypes::addZ( outType );
if ( QgsWkbTypes::hasM( inputWkbType ) )
outType = QgsWkbTypes::addM( outType );
return outType;
}
///@endcond