[geometry] Added area calculation functions.

1 files changed, 18 insertions, 1 deletions

diff --git a/geometry/geometry_tests/polygon_test.cpp b/geometry/geometry_tests/polygon_test.cpp
index 3e677afdbc..8fd6d5970d 100644
--- a/geometry/geometry_tests/polygon_test.cpp
+++ b/geometry/geometry_tests/polygon_test.cpp
@@ -1,7 +1,8 @@
 #include "testing/testing.hpp"
 
-#include "geometry/polygon.hpp"
 #include "geometry/point2d.hpp"
+#include "geometry/polygon.hpp"
+#include "geometry/triangle2d.hpp"
 
 #include "base/macros.hpp"
 
@@ -159,6 +160,22 @@ UNIT_TEST(IsPolygonCCW_DataSet)
   TestPolygonOrReverseCCW(arr, arr + ARRAY_SIZE(arr));
 }
 
+UNIT_TEST(PolygonArea_Smoke)
+{
+  {
+    P arr[] = { P (-1, 0), P(0, 1), P(1, -1) };
+    TEST_ALMOST_EQUAL_ULPS(m2::GetTriangleArea(arr[0], arr[1], arr[2]),
+                           GetPolygonArea(arr, arr + ARRAY_SIZE(arr)), ());
+  }
+
+  {
+    P arr[] = { P (-5, -7), P(-3.5, 10), P(7.2, 5), P(14, -6.4) };
+    TEST_ALMOST_EQUAL_ULPS(m2::GetTriangleArea(arr[0], arr[1], arr[2]) +
+                           m2::GetTriangleArea(arr[2], arr[3], arr[0]),
+                           GetPolygonArea(arr, arr + ARRAY_SIZE(arr)), ());
+  }
+}
+
 // This polygon has self-intersections.
 /*
 UNIT_TEST(IsPolygonCCW_DataSet2)