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Add native polygonstolines algorithm
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m-kuhn committed Jan 18, 2019
1 parent 8709ab6 commit 4c8af20
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Showing 6 changed files with 216 additions and 133 deletions.
130 changes: 0 additions & 130 deletions python/plugins/processing/algs/qgis/PolygonsToLines.py

This file was deleted.

2 changes: 0 additions & 2 deletions python/plugins/processing/algs/qgis/QgisAlgorithmProvider.py
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Expand Up @@ -98,7 +98,6 @@
from .PointsToPaths import PointsToPaths
from .PoleOfInaccessibility import PoleOfInaccessibility
from .Polygonize import Polygonize
from .PolygonsToLines import PolygonsToLines
from .PostGISExecuteSQL import PostGISExecuteSQL
from .PostGISExecuteAndLoadSQL import PostGISExecuteAndLoadSQL
from .RandomExtract import RandomExtract
Expand Down Expand Up @@ -210,7 +209,6 @@ def getAlgs(self):
PointsToPaths(),
PoleOfInaccessibility(),
Polygonize(),
PolygonsToLines(),
PostGISExecuteSQL(),
PostGISExecuteAndLoadSQL(),
RandomExtract(),
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1 change: 1 addition & 0 deletions src/analysis/CMakeLists.txt
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Expand Up @@ -73,6 +73,7 @@ SET(QGIS_ANALYSIS_SRCS
processing/qgsalgorithmorientedminimumboundingbox.cpp
processing/qgsalgorithmpackage.cpp
processing/qgsalgorithmarrayoffsetlines.cpp
processing/qgsalgorithmpolygonstolines.cpp
processing/qgsalgorithmpointonsurface.cpp
processing/qgsalgorithmprojectpointcartesian.cpp
processing/qgsalgorithmpromotetomultipart.cpp
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150 changes: 150 additions & 0 deletions src/analysis/processing/qgsalgorithmpolygonstolines.cpp
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/***************************************************************************
qgsalgorithmpolygonstolines.cpp
---------------------
begin : January 2019
copyright : (C) 2019 by Matthias Kuhn
email : matthias@opengis.ch
***************************************************************************/

/***************************************************************************
* *
* 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 "qgsalgorithmpolygonstolines.h"
#include "qgsgeometrycollection.h"
#include "qgscurvepolygon.h"
#include "qgscurve.h"
#include "qgsmultilinestring.h"

///@cond PRIVATE

QString QgsPolygonsToLinesAlgorithm::name() const
{
return QStringLiteral( "polygonstolines" );
}

QString QgsPolygonsToLinesAlgorithm::displayName() const
{
return QObject::tr( "Polygons to lines" );
}

QStringList QgsPolygonsToLinesAlgorithm::tags() const
{
return QObject::tr( "line,polygon,convert" ).split( ',' );
}

QString QgsPolygonsToLinesAlgorithm::group() const
{
return QObject::tr( "Vector creation" );
}

QString QgsPolygonsToLinesAlgorithm::groupId() const
{
return QStringLiteral( "vectorgeometry" );
}

QString QgsPolygonsToLinesAlgorithm::outputName() const
{
return QObject::tr( "Lines" );
}

QString QgsPolygonsToLinesAlgorithm::shortHelpString() const
{
return QObject::tr( "Converts polygons to lines" );
}

QString QgsPolygonsToLinesAlgorithm::shortDescription() const
{
return QObject::tr( "Converts polygons to lines." );
}

QgsPolygonsToLinesAlgorithm *QgsPolygonsToLinesAlgorithm::createInstance() const
{
return new QgsPolygonsToLinesAlgorithm();
}

QList<int> QgsPolygonsToLinesAlgorithm::inputLayerTypes() const
{
return QList< int >() << QgsProcessing::TypeVectorPolygon;
}

QgsFeatureList QgsPolygonsToLinesAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback * )
{
QgsFeatureList result;
QgsFeature feat = feature;
if ( feat.hasGeometry() )
feat.setGeometry( convertToLines( feat.geometry() ) );

result << feat;
return result;
}

QgsGeometry QgsPolygonsToLinesAlgorithm::convertToLines( const QgsGeometry &geometry ) const
{
auto rings = extractRings( geometry.constGet() );

QgsWkbTypes::Type resultType = outWkbType( geometry.wkbType() );

std::unique_ptr<QgsMultiCurve> lineGeometry;

if ( QgsWkbTypes::flatType( resultType ) == QgsWkbTypes::MultiLineString )
lineGeometry = qgis::make_unique<QgsMultiLineString>();
else
lineGeometry = qgis::make_unique<QgsMultiCurve>();

for ( auto ring : qgis::as_const( rings ) )
lineGeometry->addGeometry( ring );

return QgsGeometry( lineGeometry.release() );
}

QgsWkbTypes::Type QgsPolygonsToLinesAlgorithm::outWkbType( QgsWkbTypes::Type polygonWkbType ) const
{
QgsWkbTypes::Type wkbType = QgsWkbTypes::NoGeometry;

if ( QgsWkbTypes::singleType( QgsWkbTypes::flatType( polygonWkbType ) ) == QgsWkbTypes::Polygon )
wkbType = QgsWkbTypes::MultiLineString;
else if ( QgsWkbTypes::singleType( QgsWkbTypes::flatType( polygonWkbType ) ) == QgsWkbTypes::CurvePolygon )
wkbType = QgsWkbTypes::MultiCurve;

if ( QgsWkbTypes::hasM( polygonWkbType ) )
wkbType = QgsWkbTypes::addM( wkbType );
if ( QgsWkbTypes::hasZ( polygonWkbType ) )
wkbType = QgsWkbTypes::addZ( wkbType );

return wkbType;
}

QList<QgsCurve *> QgsPolygonsToLinesAlgorithm::extractRings( const QgsAbstractGeometry *geom ) const
{
QList<QgsCurve *> rings;

if ( QgsGeometryCollection *collection = qgsgeometry_cast<QgsGeometryCollection *>( geom ) )
{
for ( int i = 0; i < collection->numGeometries(); ++i )
{
rings.append( extractRings( collection->geometryN( i ) ) );
}
}
else if ( QgsCurvePolygon *polygon = qgsgeometry_cast<QgsCurvePolygon *>( geom ) )
{
rings.append( polygon->exteriorRing()->clone() );
for ( int i = 0; i < polygon->numInteriorRings(); ++i )
{
rings.append( polygon->interiorRing( i )->clone() );
}
}

return rings;
}



///@endcond


63 changes: 63 additions & 0 deletions src/analysis/processing/qgsalgorithmpolygonstolines.h
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@@ -0,0 +1,63 @@
/***************************************************************************
qgsalgorithmpolygontolines.h
---------------------
begin : January 2019
copyright : (C) 2019 by Matthias Kuhn
email : matthias@opengis.ch
***************************************************************************/

/***************************************************************************
* *
* 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. *
* *
***************************************************************************/

#ifndef QGSALGORITHMPOLYGONSTOLINES_H
#define QGSALGORITHMPOLYGONSTOLINES_H

#define SIP_NO_FILE

#include "qgis.h"
#include "qgsprocessingalgorithm.h"

///@cond PRIVATE

/**
* Native convert polygons to lines algorithm
*/
class QgsPolygonsToLinesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
{

public:

QgsPolygonsToLinesAlgorithm() = default;
QString name() const override;
QString displayName() const override;
QStringList tags() const override;
QString group() const override;
QString groupId() const override;
QString shortHelpString() const override;
QString shortDescription() const override;
QgsPolygonsToLinesAlgorithm *createInstance() const override SIP_FACTORY;
QList<int> inputLayerTypes() const override;

protected:
QString outputName() const override;
QgsFeatureList processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;

private:
QgsGeometry convertToLines( const QgsGeometry &geometry ) const;
QList<QgsCurve *> extractRings( const QgsAbstractGeometry *geom ) const;
QgsWkbTypes::Type outWkbType( QgsWkbTypes::Type polygonWkbType ) const;

friend class TestQgsProcessingAlgs;
};

///@endcond PRIVATE

#endif // QGSALGORITHMPOLYGONSTOLINES_H


3 changes: 2 additions & 1 deletion src/analysis/processing/qgsnativealgorithms.cpp
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Expand Up @@ -105,7 +105,7 @@
#include "qgsalgorithmvectorize.h"
#include "qgsalgorithmwedgebuffers.h"
#include "qgsalgorithmzonalhistogram.h"

#include "qgsalgorithmpolygonstolines.h"

///@cond PRIVATE

Expand Down Expand Up @@ -243,6 +243,7 @@ void QgsNativeAlgorithms::loadAlgorithms()
addAlgorithm( new QgsVariableWidthBufferByMAlgorithm() );
addAlgorithm( new QgsWedgeBuffersAlgorithm() );
addAlgorithm( new QgsZonalHistogramAlgorithm() );
addAlgorithm( new QgsPolygonsToLinesAlgorithm() );
}


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