ui: Add the gfx::Vector3dF class.

ui/gfx/point3_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/gfx/point3_f.h"
+
+#include "base/basictypes.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace gfx {
+
+TEST(Point3Test, VectorArithmetic) {
+  gfx::Point3F a(1.6f, 5.1f, 3.2f);
+  gfx::Vector3dF v1(3.1f, -3.2f, 9.3f);
+  gfx::Vector3dF v2(-8.1f, 1.2f, 3.3f);
+
+  static const struct {
+    gfx::Point3F expected;
+    gfx::Point3F actual;
+  } tests[] = {
+    { gfx::Point3F(4.7f, 1.9f, 12.5f), a + v1 },
+    { gfx::Point3F(-1.5f, 8.3f, -6.1f), a - v1 },
+    { a, a - v1 + v1 },
+    { a, a + v1 - v1 },
+    { a, a + gfx::Vector3dF() },
+    { gfx::Point3F(12.8f, 0.7f, 9.2f), a + v1 - v2 },
+    { gfx::Point3F(-9.6f, 9.5f, -2.8f), a - v1 + v2 }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i)
+    EXPECT_EQ(tests[i].expected.ToString(),
+              tests[i].actual.ToString());
+}
+
+TEST(Point3Test, VectorFromPoints) {
+  gfx::Point3F a(1.6f, 5.2f, 3.2f);
+  gfx::Vector3dF v1(3.1f, -3.2f, 9.3f);
+
+  gfx::Point3F b(a + v1);
+  EXPECT_EQ((b - a).ToString(), v1.ToString());
+}
+
+}  // namespace gfx