[processing] Port reverse line direction alg to c++

python/plugins/processing/algs/qgis/QgisAlgorithmProvider.py

@@ -117,7 +117,6 @@
 from .RectanglesOvalsDiamondsVariable import RectanglesOvalsDiamondsVariable
 from .RegularPoints import RegularPoints
 from .Relief import Relief
-from .ReverseLineDirection import ReverseLineDirection
 from .Ruggedness import Ruggedness
 from .SelectByAttribute import SelectByAttribute
 from .SelectByExpression import SelectByExpression
@@ -233,7 +232,6 @@ def getAlgs(self):
                 RectanglesOvalsDiamondsVariable(),
                 RegularPoints(),
                 Relief(),
-                ReverseLineDirection(),
                 Ruggedness(),
                 SelectByAttribute(),
                 SelectByExpression(),

python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml

@@ -959,7 +959,7 @@ tests:
         name: expected/point_on_line.gml
         type: vector
 
-  - algorithm: qgis:reverselinedirection
+  - algorithm: native:reverselinedirection
     name: Reverse line direction
     params:
       INPUT:

src/analysis/CMakeLists.txt

@@ -68,6 +68,7 @@ SET(QGIS_ANALYSIS_SRCS
   processing/qgsalgorithmremoveholes.cpp
   processing/qgsalgorithmremovenullgeometry.cpp
   processing/qgsalgorithmrenamelayer.cpp
+  processing/qgsalgorithmreverselinedirection.cpp
   processing/qgsalgorithmrotate.cpp
   processing/qgsalgorithmsaveselectedfeatures.cpp
   processing/qgsalgorithmsegmentize.cpp

src/analysis/processing/qgsalgorithmreverselinedirection.cpp

@@ -0,0 +1,106 @@
+/***************************************************************************
+                         qgsalgorithmreverselinedirection.cpp
+                         ------------------------------------
+    begin                : July 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 "qgsalgorithmreverselinedirection.h"
+#include "qgscurve.h"
+
+///@cond PRIVATE
+
+QString QgsReverseLineDirectionAlgorithm ::name() const
+{
+  return QStringLiteral( "reverselinedirection" );
+}
+
+QString QgsReverseLineDirectionAlgorithm ::displayName() const
+{
+  return QObject::tr( "Reverse line direction" );
+}
+
+QStringList QgsReverseLineDirectionAlgorithm ::tags() const
+{
+  return QObject::tr( "swap,reverse,switch,flip,linestring,orientation" ).split( ',' );
+}
+
+QString QgsReverseLineDirectionAlgorithm ::group() const
+{
+  return QObject::tr( "Vector geometry" );
+}
+
+QString QgsReverseLineDirectionAlgorithm ::groupId() const
+{
+  return QStringLiteral( "vectorgeometry" );
+}
+
+QString QgsReverseLineDirectionAlgorithm ::outputName() const
+{
+  return QObject::tr( "Reversed" );
+}
+
+QString QgsReverseLineDirectionAlgorithm ::shortHelpString() const
+{
+  return QObject::tr( "This algorithm reverses the direction of curve or LineString geometries." );
+}
+
+QString QgsReverseLineDirectionAlgorithm::shortDescription() const
+{
+  return QObject::tr( "Reverses the direction of curve or LineString geometries." );
+}
+
+QgsReverseLineDirectionAlgorithm  *QgsReverseLineDirectionAlgorithm ::createInstance() const
+{
+  return new QgsReverseLineDirectionAlgorithm();
+}
+
+QgsProcessing::SourceType QgsReverseLineDirectionAlgorithm::outputLayerType() const
+{
+  return QgsProcessing::TypeVectorLine;
+}
+
+QList<int> QgsReverseLineDirectionAlgorithm::inputLayerTypes() const
+{
+  return QList<int>() << QgsProcessing::TypeVectorLine;
+}
+
+QgsProcessingFeatureSource::Flag QgsReverseLineDirectionAlgorithm ::sourceFlags() const
+{
+  // this algorithm doesn't care about invalid geometries
+  return QgsProcessingFeatureSource::FlagSkipGeometryValidityChecks;
+}
+
+QgsFeatureList QgsReverseLineDirectionAlgorithm ::processFeature( const QgsFeature &f, QgsProcessingContext &, QgsProcessingFeedback * )
+{
+  QgsFeature feature = f;
+  if ( feature.hasGeometry() )
+  {
+    const QgsGeometry geom = feature.geometry();
+    const QgsCurve *curve = qgsgeometry_cast< const QgsCurve * >( geom.constGet() );
+    if ( curve )
+    {
+      std::unique_ptr< QgsCurve > reversed( curve->reversed() );
+      if ( !reversed )
+      {
+        // can this even happen?
+        throw QgsProcessingException( QObject::tr( "Error reversing line" ) );
+      }
+      const QgsGeometry outGeom( std::move( reversed ) );
+      feature.setGeometry( outGeom );
+    }
+  }
+  return QgsFeatureList() << feature;
+}
+
+///@endcond

src/analysis/processing/qgsalgorithmreverselinedirection.h

@@ -0,0 +1,60 @@
+/***************************************************************************
+                         qgsalgorithmreverselinedirection.h
+                         ----------------------------------
+    begin                : July 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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSALGORITHMREVERSELINEDIRECTION_H
+#define QGSALGORITHMREVERSELINEDIRECTION_H
+
+#define SIP_NO_FILE
+
+#include "qgis.h"
+#include "qgsprocessingalgorithm.h"
+
+///@cond PRIVATE
+
+/**
+ * Native reverse line direction algorithm.
+ */
+class QgsReverseLineDirectionAlgorithm : public QgsProcessingFeatureBasedAlgorithm
+{
+
+  public:
+
+    QgsReverseLineDirectionAlgorithm() = 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;
+    QgsReverseLineDirectionAlgorithm  *createInstance() const override SIP_FACTORY;
+    QgsProcessing::SourceType outputLayerType() const override;
+    QList<int> inputLayerTypes() const override;
+
+  protected:
+
+    QString outputName() const override;
+    QgsProcessingFeatureSource::Flag sourceFlags() const override;
+    QgsFeatureList processFeature( const QgsFeature &feature,  QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
+
+};
+
+///@endcond PRIVATE
+
+#endif // QGSALGORITHMREVERSELINEDIRECTION_H
+
+

src/analysis/processing/qgsnativealgorithms.cpp

@@ -65,6 +65,7 @@
 #include "qgsalgorithmremoveholes.h"
 #include "qgsalgorithmremovenullgeometry.h"
 #include "qgsalgorithmrenamelayer.h"
+#include "qgsalgorithmreverselinedirection.h"
 #include "qgsalgorithmrotate.h"
 #include "qgsalgorithmsaveselectedfeatures.h"
 #include "qgsalgorithmsegmentize.h"
@@ -177,6 +178,7 @@ void QgsNativeAlgorithms::loadAlgorithms()
   addAlgorithm( new QgsRemoveHolesAlgorithm() );
   addAlgorithm( new QgsRemoveNullGeometryAlgorithm() );
   addAlgorithm( new QgsRenameLayerAlgorithm() );
+  addAlgorithm( new QgsReverseLineDirectionAlgorithm() );
   addAlgorithm( new QgsRotateFeaturesAlgorithm() );
   addAlgorithm( new QgsSaveSelectedFeatures() );
   addAlgorithm( new QgsSegmentizeByMaximumAngleAlgorithm() );