src/cobalt/math/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 "cobalt/math/point3_f.h"

#include "base/basictypes.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cobalt {
namespace math {

TEST(Point3Test, VectorArithmetic) {
  Point3F a(1.6f, 5.1f, 3.2f);
  Vector3dF v1(3.1f, -3.2f, 9.3f);
  Vector3dF v2(-8.1f, 1.2f, 3.3f);

  static const struct {
    Point3F expected;
    Point3F actual;
  } tests[] = {{Point3F(4.7f, 1.9f, 12.5f), a + v1},
               {Point3F(-1.5f, 8.3f, -6.1f), a - v1},
               {a, a - v1 + v1},
               {a, a + v1 - v1},
               {a, a + Vector3dF()},
               {Point3F(12.8f, 0.7f, 9.2f), a + v1 - v2},
               {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());

  a += v1;
  EXPECT_EQ(Point3F(4.7f, 1.9f, 12.5f).ToString(), a.ToString());

  a -= v2;
  EXPECT_EQ(Point3F(12.8f, 0.7f, 9.2f).ToString(), a.ToString());
}

TEST(Point3Test, VectorFromPoints) {
  Point3F a(1.6f, 5.2f, 3.2f);
  Vector3dF v1(3.1f, -3.2f, 9.3f);

  Point3F b(a + v1);
  EXPECT_EQ((b - a).ToString(), v1.ToString());
}

TEST(Point3Test, Scale) {
  EXPECT_EQ(Point3F().ToString(), ScalePoint(Point3F(), 2.f).ToString());
  EXPECT_EQ(Point3F().ToString(),
            ScalePoint(Point3F(), 2.f, 2.f, 2.f).ToString());

  EXPECT_EQ(Point3F(2.f, -2.f, 4.f).ToString(),
            ScalePoint(Point3F(1.f, -1.f, 2.f), 2.f).ToString());
  EXPECT_EQ(Point3F(2.f, -3.f, 8.f).ToString(),
            ScalePoint(Point3F(1.f, -1.f, 2.f), 2.f, 3.f, 4.f).ToString());

  Point3F zero;
  zero.Scale(2.f);
  zero.Scale(6.f, 3.f, 1.5f);
  EXPECT_EQ(Point3F().ToString(), zero.ToString());

  Point3F point(1.f, -1.f, 2.f);
  point.Scale(2.f);
  point.Scale(6.f, 3.f, 1.5f);
  EXPECT_EQ(Point3F(12.f, -6.f, 6.f).ToString(), point.ToString());
}

}  // namespace math
}  // namespace cobalt