Unit tests for straightDistance2d/sinuosity

nyalldawson · nyalldawson · commit 41d16a8491ec · 2018-03-12T14:58:04.000+11:00
diff --git a/tests/src/python/test_qgsgeometry.py b/tests/src/python/test_qgsgeometry.py
@@ -3525,6 +3525,30 @@ def testMergeLines(self):
         exp = 'MultiLineString((0 0, 10 10),(12 2, 14 4))'
         self.assertTrue(compareWkt(result, exp, 0.00001), "Merge lines: mismatch Expected:\n{}\nGot:\n{}\n".format(exp, result))
 
+    def testCurveSinuosity(self):
+        """
+        Test curve straightDistance2d() and sinuosity()
+        """
+        linestring = QgsGeometry.fromWkt('LineString()')
+        self.assertEqual(linestring.constGet().straightDistance2d(), 0.0)
+        self.assertTrue(math.isnan(linestring.constGet().sinuosity()))
+        linestring = QgsGeometry.fromWkt('LineString(0 0, 10 0)')
+        self.assertEqual(linestring.constGet().straightDistance2d(), 10.0)
+        self.assertEqual(linestring.constGet().sinuosity(), 1.0)
+        linestring = QgsGeometry.fromWkt('LineString(0 0, 10 10, 5 0)')
+        self.assertAlmostEqual(linestring.constGet().straightDistance2d(), 5.0, 4)
+        self.assertAlmostEqual(linestring.constGet().sinuosity(), 5.06449510, 4)
+        linestring = QgsGeometry.fromWkt('LineString(0 0, 10 0, 10 10, 0 10, 0 0)')
+        self.assertEqual(linestring.constGet().straightDistance2d(), 0.0)
+        self.assertTrue(math.isnan(linestring.constGet().sinuosity()))
+
+        curve = QgsGeometry.fromWkt('CircularString (20 30, 50 30, 50 90)')
+        self.assertAlmostEqual(curve.constGet().straightDistance2d(), 67.08203932, 4)
+        self.assertAlmostEqual(curve.constGet().sinuosity(), 1.57079632, 4)
+        curve = QgsGeometry.fromWkt('CircularString (20 30, 50 30, 20 30)')
+        self.assertAlmostEqual(curve.constGet().straightDistance2d(), 0.0, 4)
+        self.assertTrue(math.isnan(curve.constGet().sinuosity()))
+
     def testLineLocatePoint(self):
         """ test QgsGeometry.lineLocatePoint() """
 
