ui: Add the gfx::Vector3dF class.

ui/gfx/vector3d_unittest.cc

Index: ui/gfx/vector3d_unittest.cc
diff --git a/ui/gfx/vector3d_unittest.cc b/ui/gfx/vector3d_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cfac51eab0d0ac3e600b54603bfa85c7e7110754
--- /dev/null
+++ b/ui/gfx/vector3d_unittest.cc
@@ -0,0 +1,215 @@
+// 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 "base/basictypes.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/vector3d_f.h"
+
+#include <cmath>
+#include <limits>
+
+namespace gfx {
+
+TEST(Vector3dTest, IsZero) {
+  gfx::Vector3dF float_zero(0, 0, 0);
+  gfx::Vector3dF float_nonzero(0.1f, -0.1f, 0.1f);
+
+  EXPECT_TRUE(float_zero.IsZero());
+  EXPECT_FALSE(float_nonzero.IsZero());
+}
+
+TEST(Vector3dTest, Add) {
+  gfx::Vector3dF f1(3.1f, 5.1f, 2.7f);
+  gfx::Vector3dF f2(4.3f, -1.3f, 8.1f);
+
+  const struct {
+    gfx::Vector3dF expected;
+    gfx::Vector3dF actual;
+  } float_tests[] = {
+    { gfx::Vector3dF(3.1F, 5.1F, 2.7f), f1 + gfx::Vector3dF() },
+    { gfx::Vector3dF(3.1f + 4.3f, 5.1f - 1.3f, 2.7f + 8.1f), f1 + f2 },
+    { gfx::Vector3dF(3.1f - 4.3f, 5.1f + 1.3f, 2.7f - 8.1f), f1 - f2 }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(float_tests); ++i)
+    EXPECT_EQ(float_tests[i].expected.ToString(),
+              float_tests[i].actual.ToString());
+}
+
+TEST(Vector3dTest, Negative) {
+  const struct {
+    gfx::Vector3dF expected;
+    gfx::Vector3dF actual;
+  } float_tests[] = {
+    { gfx::Vector3dF(-0.0f, -0.0f, -0.0f), -gfx::Vector3dF(0, 0, 0) },
+    { gfx::Vector3dF(-0.3f, -0.3f, -0.3f), -gfx::Vector3dF(0.3f, 0.3f, 0.3f) },
+    { gfx::Vector3dF(0.3f, 0.3f, 0.3f), -gfx::Vector3dF(-0.3f, -0.3f, -0.3f) },
+    { gfx::Vector3dF(-0.3f, 0.3f, -0.3f), -gfx::Vector3dF(0.3f, -0.3f, 0.3f) },
+    { gfx::Vector3dF(0.3f, -0.3f, -0.3f), -gfx::Vector3dF(-0.3f, 0.3f, 0.3f) },
+    { gfx::Vector3dF(-0.3f, -0.3f, 0.3f), -gfx::Vector3dF(0.3f, 0.3f, -0.3f) }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(float_tests); ++i)
+    EXPECT_EQ(float_tests[i].expected.ToString(),
+              float_tests[i].actual.ToString());
+}
+
+TEST(Vector3dTest, Scale) {
+  float triple_values[][6] = {
+    { 4.5f, 1.2f, 1.8f, 3.3f, 5.6f, 4.2f },
+    { 4.5f, -1.2f, -1.8f, 3.3f, 5.6f, 4.2f },
+    { 4.5f, 1.2f, -1.8f, 3.3f, 5.6f, 4.2f },
+    { 4.5f, -1.2f -1.8f, 3.3f, 5.6f, 4.2f },
+
+    { 4.5f, 1.2f, 1.8f, 3.3f, -5.6f, -4.2f },
+    { 4.5f, 1.2f, 1.8f, -3.3f, -5.6f, -4.2f },
+    { 4.5f, 1.2f, -1.8f, 3.3f, -5.6f, -4.2f },
+    { 4.5f, 1.2f, -1.8f, -3.3f, -5.6f, -4.2f },
+
+    { -4.5f, 1.2f, 1.8f, 3.3f, 5.6f, 4.2f },
+    { -4.5f, 1.2f, 1.8f, 0, 5.6f, 4.2f },
+    { -4.5f, 1.2f, -1.8f, 3.3f, 5.6f, 4.2f },
+    { -4.5f, 1.2f, -1.8f, 0, 5.6f, 4.2f },
+
+    { -4.5f, 1.2f, 1.8f, 3.3f, 0, 4.2f },
+    { 4.5f, 0, 1.8f, 3.3f, 5.6f, 4.2f },
+    { -4.5f, 1.2f, -1.8f, 3.3f, 0, 4.2f },
+    { 4.5f, 0, -1.8f, 3.3f, 5.6f, 4.2f },
+    { -4.5f, 1.2f, 1.8f, 3.3f, 5.6f, 0 },
+    { -4.5f, 1.2f, -1.8f, 3.3f, 5.6f, 0 },
+
+    { 0, 1.2f, 0, 3.3f, 5.6f, 4.2f },
+    { 0, 1.2f, 1.8f, 3.3f, 5.6f, 4.2f }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(triple_values); ++i) {
+    gfx::Vector3dF v(triple_values[i][0],
+                     triple_values[i][1],
+                     triple_values[i][2]);
+    v.Scale(triple_values[i][3], triple_values[i][4], triple_values[i][5]);
+    EXPECT_EQ(v.x(), triple_values[i][0] * triple_values[i][3]);
+    EXPECT_EQ(v.y(), triple_values[i][1] * triple_values[i][4]);
+    EXPECT_EQ(v.z(), triple_values[i][2] * triple_values[i][5]);
+  }
+
+  float single_values[][4] = {
+    { 4.5f, 1.2f, 1.8f, 3.3f },
+    { 4.5f, -1.2f, 1.8f, 3.3f },
+    { 4.5f, 1.2f, -1.8f, 3.3f },
+    { 4.5f, -1.2f, -1.8f, 3.3f },
+    { -4.5f, 1.2f, 3.3f },
+    { -4.5f, 1.2f, 0 },
+    { -4.5f, 1.2f, 1.8f, 3.3f },
+    { -4.5f, 1.2f, 1.8f, 0 },
+    { 4.5f, 0, 1.8f, 3.3f },
+    { 0, 1.2f, 1.8f, 3.3f },
+    { 4.5f, 0, 1.8f, 3.3f },
+    { 0, 1.2f, 1.8f, 3.3f },
+    { 4.5f, 1.2f, 0, 3.3f },
+    { 4.5f, 1.2f, 0, 3.3f }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(single_values); ++i) {
+    gfx::Vector3dF v(single_values[i][0],
+                     single_values[i][1],
+                     single_values[i][2]);
+    v.Scale(single_values[i][3]);
+    EXPECT_EQ(v.x(), single_values[i][0] * single_values[i][3]);
+    EXPECT_EQ(v.y(), single_values[i][1] * single_values[i][3]);
+    EXPECT_EQ(v.z(), single_values[i][2] * single_values[i][3]);
+  }
+}
+
+TEST(Vector3dTest, Length) {
+  float float_values[][3] = {
+    { 0, 0, 0 },
+    { 10.5f, 20.5f, 8.5f },
+    { 20.5f, 10.5f, 8.5f },
+    { 8.5f, 20.5f, 10.5f },
+    { 10.5f, 8.5f, 20.5f },
+    { -10.5f, -20.5f, -8.5f },
+    { -20.5f, 10.5f, -8.5f },
+    { -8.5f, -20.5f, -10.5f },
+    { -10.5f, -8.5f, -20.5f },
+    { 10.5f, -20.5f, 8.5f },
+    { -10.5f, 20.5f, 8.5f },
+    { 10.5f, -20.5f, -8.5f },
+    { -10.5f, 20.5f, -8.5f },
+    // A large vector that fails if the Length function doesn't use
+    // double precision internally.
+    { 1236278317862780234892374893213178027.12122348904204230f,
+      335890352589839028212313231225425134332.38123f,
+      27861786423846742743236423478236784678.236713617231f }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(float_values); ++i) {
+    double v0 = float_values[i][0];
+    double v1 = float_values[i][1];
+    double v2 = float_values[i][2];
+    double length_squared =
+        static_cast<double>(v0) * v0 +
+        static_cast<double>(v1) * v1 +
+        static_cast<double>(v2) * v2;
+    double length = std::sqrt(length_squared);
+    gfx::Vector3dF vector(v0, v1, v2);
+    EXPECT_EQ(length_squared, vector.LengthSquared());
+    EXPECT_EQ(static_cast<float>(length), vector.Length());
+  }
+}
+
+TEST(Vector3dTest, DotProduct) {
+  const struct {
+    float expected;
+    gfx::Vector3dF input1;
+    gfx::Vector3dF input2;
+  } tests[] = {
+    { 0, gfx::Vector3dF(1, 0, 0), gfx::Vector3dF(0, 1, 1) },
+    { 0, gfx::Vector3dF(0, 1, 0), gfx::Vector3dF(1, 0, 1) },
+    { 0, gfx::Vector3dF(0, 0, 1), gfx::Vector3dF(1, 1, 0) },
+
+    { 3, gfx::Vector3dF(1, 1, 1), gfx::Vector3dF(1, 1, 1) },
+
+    { 1.2f, gfx::Vector3dF(1.2f, -1.2f, 1.2f), gfx::Vector3dF(1, 1, 1) },
+    { 1.2f, gfx::Vector3dF(1, 1, 1), gfx::Vector3dF(1.2f, -1.2f, 1.2f) },
+
+    { 38.72f,
+      gfx::Vector3dF(1.1f, 2.2f, 3.3f), gfx::Vector3dF(4.4f, 5.5f, 6.6f) }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    float actual = gfx::DotProduct(tests[i].input1, tests[i].input2);
+    EXPECT_EQ(tests[i].expected, actual);
+  }
+}
+
+TEST(Vector3dTest, CrossProduct) {
+  const struct {
+    gfx::Vector3dF expected;
+    gfx::Vector3dF input1;
+    gfx::Vector3dF input2;
+  } tests[] = {
+    { Vector3dF(), Vector3dF(), Vector3dF(1, 1, 1) },
+    { Vector3dF(), Vector3dF(1, 1, 1), Vector3dF() },
+    { Vector3dF(), Vector3dF(1, 1, 1), Vector3dF(1, 1, 1) },
+    { Vector3dF(),
+      Vector3dF(1.6f, 10.6f, -10.6f),
+      Vector3dF(1.6f, 10.6f, -10.6f) },
+
+    { Vector3dF(1, -1, 0), Vector3dF(1, 1, 1), Vector3dF(0, 0, 1) },
+    { Vector3dF(-1, 0, 1), Vector3dF(1, 1, 1), Vector3dF(0, 1, 0) },
+    { Vector3dF(0, 1, -1), Vector3dF(1, 1, 1), Vector3dF(1, 0, 0) },
+
+    { Vector3dF(-1, 1, 0), Vector3dF(0, 0, 1), Vector3dF(1, 1, 1) },
+    { Vector3dF(1, 0, -1), Vector3dF(0, 1, 0), Vector3dF(1, 1, 1) },
+    { Vector3dF(0, -1, 1), Vector3dF(1, 0, 0), Vector3dF(1, 1, 1) }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    Vector3dF actual = gfx::CrossProduct(tests[i].input1, tests[i].input2);
+    EXPECT_EQ(tests[i].expected.ToString(), actual.ToString());
+  }
+
+}
+
+}  // namespace gfx