fix(QgsCurve): properly handle area cache when reversing geometry (#5…

…9183)

(cherry picked from commit 8f1a6e3)

Co-authored-by: Loïc Bartoletti <loic.bartoletti@oslandia.com>

src/core/geometry/qgscircularstring.cpp

@@ -1626,6 +1626,8 @@ QgsCircularString *QgsCircularString::reversed() const
   {
     std::reverse( copy->mM.begin(), copy->mM.end() );
   }
+
+  copy->mSummedUpArea = -mSummedUpArea;
   return copy;
 }
 

src/core/geometry/qgslinestring.cpp

@@ -1372,6 +1372,8 @@ QgsLineString *QgsLineString::reversed() const
   {
     std::reverse( copy->mM.begin(), copy->mM.end() );
   }
+
+  copy->mSummedUpArea = -mSummedUpArea;
   return copy;
 }
 

tests/src/python/test_qgsgeometry.py

@@ -7413,6 +7413,22 @@ def testConstrainedDelaunayTriangulation(self):
             "MultiPolygon (((41.96 29.61, 41.96 30.39, 42 30, 41.96 29.61)),((41.66 31.11, 41.85 30.77, 41.96 30.39, 41.66 31.11)),((41.66 28.89, 41.96 29.61, 41.85 29.23, 41.66 28.89)),((41.41 31.41, 41.96 30.39, 41.96 29.61, 41.41 31.41)),((41.41 31.41, 41.66 31.11, 41.96 30.39, 41.41 31.41)),((41.41 28.59, 41.96 29.61, 41.66 28.89, 41.41 28.59)),((41.41 28.59, 41.41 31.41, 41.96 29.61, 41.41 28.59)),((40.39 31.96, 41.11 31.66, 41.41 31.41, 40.39 31.96)),((40.39 31.96, 40.77 31.85, 41.11 31.66, 40.39 31.96)),((40.39 28.04, 41.41 28.59, 41.11 28.34, 40.39 28.04)),((40.39 28.04, 41.11 28.34, 40.77 28.15, 40.39 28.04)),((39.61 31.96, 40.39 31.96, 41.41 31.41, 39.61 31.96)),((39.61 31.96, 40 32, 40.39 31.96, 39.61 31.96)),((39.61 28.04, 40.39 28.04, 40 28, 39.61 28.04)),((38.89 31.66, 39.23 31.85, 39.61 31.96, 38.89 31.66)),((38.89 28.34, 39.61 28.04, 39.23 28.15, 38.89 28.34)),((38.59 31.41, 41.41 31.41, 41.41 28.59, 38.59 31.41)),((38.59 31.41, 39.61 31.96, 41.41 31.41, 38.59 31.41)),((38.59 31.41, 38.89 31.66, 39.61 31.96, 38.59 31.41)),((38.59 28.59, 41.41 28.59, 40.39 28.04, 38.59 28.59)),((38.59 28.59, 40.39 28.04, 39.61 28.04, 38.59 28.59)),((38.59 28.59, 39.61 28.04, 38.89 28.34, 38.59 28.59)),((38.59 28.59, 38.59 31.41, 41.41 28.59, 38.59 28.59)),((38.04 30.39, 38.59 31.41, 38.59 28.59, 38.04 30.39)),((38.04 30.39, 38.34 31.11, 38.59 31.41, 38.04 30.39)),((38.04 30.39, 38.15 30.77, 38.34 31.11, 38.04 30.39)),((38.04 29.61, 38.59 28.59, 38.34 28.89, 38.04 29.61)),((38.04 29.61, 38.34 28.89, 38.15 29.23, 38.04 29.61)),((38.04 29.61, 38.04 30.39, 38.59 28.59, 38.04 29.61)),((38 30, 38.04 30.39, 38.04 29.61, 38 30)))"
         )
 
+    def test_orientation(self):
+        """
+        test orientation. From https://github.com/qgis/QGIS/issues/58333
+        """
+        geom = QgsLineString()
+        geom.fromWkt('LineString (1 1, 2 1, 2 2, 1 2, 1 1)')
+        self.assertEqual(geom.sumUpArea(), 1.0)
+        self.assertEqual(geom.orientation(), Qgis.AngularDirection.CounterClockwise)
+        geom.fromWkt('LineString (1 1, 1 2, 2 2, 2 1, 1 1)')
+        self.assertEqual(geom.sumUpArea(), -1.0)
+        self.assertEqual(geom.orientation(), Qgis.AngularDirection.Clockwise)
+        geom = geom.reversed()
+        self.assertEqual(geom.asWkt(), 'LineString (1 1, 2 1, 2 2, 1 2, 1 1)')
+        self.assertEqual(geom.sumUpArea(), 1.0)
+        self.assertEqual(geom.orientation(), Qgis.AngularDirection.CounterClockwise)
+
 
 if __name__ == '__main__':
     unittest.main()