ui/gfx/geometry/vector2d_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <cmath>
   6 #include <limits>
   7
   8 #include "base/basictypes.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10 #include "ui/gfx/geometry/vector2d.h"
  11 #include "ui/gfx/geometry/vector2d_f.h"
  12
  13 namespace gfx {
  14
  15 TEST(Vector2dTest, ConversionToFloat) {
  16   Vector2d i(3, 4);
  17   Vector2dF f = i;
  18   EXPECT_EQ(i, f);
  19 }
  20
  21 TEST(Vector2dTest, IsZero) {
  22   Vector2d int_zero(0, 0);
  23   Vector2d int_nonzero(2, -2);
  24   Vector2dF float_zero(0, 0);
  25   Vector2dF float_nonzero(0.1f, -0.1f);
  26
  27   EXPECT_TRUE(int_zero.IsZero());
  28   EXPECT_FALSE(int_nonzero.IsZero());
  29   EXPECT_TRUE(float_zero.IsZero());
  30   EXPECT_FALSE(float_nonzero.IsZero());
  31 }
  32
  33 TEST(Vector2dTest, Add) {
  34   Vector2d i1(3, 5);
  35   Vector2d i2(4, -1);
  36
  37   const struct {
  38     Vector2d expected;
  39     Vector2d actual;
  40   } int_tests[] = {
  41     { Vector2d(3, 5), i1 + Vector2d() },
  42     { Vector2d(3 + 4, 5 - 1), i1 + i2 },
  43     { Vector2d(3 - 4, 5 + 1), i1 - i2 }
  44   };
  45
  46   for (size_t i = 0; i < arraysize(int_tests); ++i)
  47     EXPECT_EQ(int_tests[i].expected.ToString(),
  48               int_tests[i].actual.ToString());
  49
  50   Vector2dF f1(3.1f, 5.1f);
  51   Vector2dF f2(4.3f, -1.3f);
  52
  53   const struct {
  54     Vector2dF expected;
  55     Vector2dF actual;
  56   } float_tests[] = {
  57     { Vector2dF(3.1F, 5.1F), f1 + Vector2d() },
  58     { Vector2dF(3.1F, 5.1F), f1 + Vector2dF() },
  59     { Vector2dF(3.1f + 4.3f, 5.1f - 1.3f), f1 + f2 },
  60     { Vector2dF(3.1f - 4.3f, 5.1f + 1.3f), f1 - f2 }
  61   };
  62
  63   for (size_t i = 0; i < arraysize(float_tests); ++i)
  64     EXPECT_EQ(float_tests[i].expected.ToString(),
  65               float_tests[i].actual.ToString());
  66 }
  67
  68 TEST(Vector2dTest, Negative) {
  69   const struct {
  70     Vector2d expected;
  71     Vector2d actual;
  72   } int_tests[] = {
  73     { Vector2d(0, 0), -Vector2d(0, 0) },
  74     { Vector2d(-3, -3), -Vector2d(3, 3) },
  75     { Vector2d(3, 3), -Vector2d(-3, -3) },
  76     { Vector2d(-3, 3), -Vector2d(3, -3) },
  77     { Vector2d(3, -3), -Vector2d(-3, 3) }
  78   };
  79
  80   for (size_t i = 0; i < arraysize(int_tests); ++i)
  81     EXPECT_EQ(int_tests[i].expected.ToString(),
  82               int_tests[i].actual.ToString());
  83
  84   const struct {
  85     Vector2dF expected;
  86     Vector2dF actual;
  87   } float_tests[] = {
  88     { Vector2dF(0, 0), -Vector2d(0, 0) },
  89     { Vector2dF(-0.3f, -0.3f), -Vector2dF(0.3f, 0.3f) },
  90     { Vector2dF(0.3f, 0.3f), -Vector2dF(-0.3f, -0.3f) },
  91     { Vector2dF(-0.3f, 0.3f), -Vector2dF(0.3f, -0.3f) },
  92     { Vector2dF(0.3f, -0.3f), -Vector2dF(-0.3f, 0.3f) }
  93   };
  94
  95   for (size_t i = 0; i < arraysize(float_tests); ++i)
  96     EXPECT_EQ(float_tests[i].expected.ToString(),
  97               float_tests[i].actual.ToString());
  98 }
  99
 100 TEST(Vector2dTest, Scale) {
 101   float double_values[][4] = {
 102     { 4.5f, 1.2f, 3.3f, 5.6f },
 103     { 4.5f, -1.2f, 3.3f, 5.6f },
 104     { 4.5f, 1.2f, 3.3f, -5.6f },
 105     { 4.5f, 1.2f, -3.3f, -5.6f },
 106     { -4.5f, 1.2f, 3.3f, 5.6f },
 107     { -4.5f, 1.2f, 0, 5.6f },
 108     { -4.5f, 1.2f, 3.3f, 0 },
 109     { 4.5f, 0, 3.3f, 5.6f },
 110     { 0, 1.2f, 3.3f, 5.6f }
 111   };
 112
 113   for (size_t i = 0; i < arraysize(double_values); ++i) {
 114     Vector2dF v(double_values[i][0], double_values[i][1]);
 115     v.Scale(double_values[i][2], double_values[i][3]);
 116     EXPECT_EQ(v.x(), double_values[i][0] * double_values[i][2]);
 117     EXPECT_EQ(v.y(), double_values[i][1] * double_values[i][3]);
 118
 119     Vector2dF v2 = ScaleVector2d(
 120         gfx::Vector2dF(double_values[i][0], double_values[i][1]),
 121         double_values[i][2], double_values[i][3]);
 122     EXPECT_EQ(double_values[i][0] * double_values[i][2], v2.x());
 123     EXPECT_EQ(double_values[i][1] * double_values[i][3], v2.y());
 124   }
 125
 126   float single_values[][3] = {
 127     { 4.5f, 1.2f, 3.3f },
 128     { 4.5f, -1.2f, 3.3f },
 129     { 4.5f, 1.2f, 3.3f },
 130     { 4.5f, 1.2f, -3.3f },
 131     { -4.5f, 1.2f, 3.3f },
 132     { -4.5f, 1.2f, 0 },
 133     { -4.5f, 1.2f, 3.3f },
 134     { 4.5f, 0, 3.3f },
 135     { 0, 1.2f, 3.3f }
 136   };
 137
 138   for (size_t i = 0; i < arraysize(single_values); ++i) {
 139     Vector2dF v(single_values[i][0], single_values[i][1]);
 140     v.Scale(single_values[i][2]);
 141     EXPECT_EQ(v.x(), single_values[i][0] * single_values[i][2]);
 142     EXPECT_EQ(v.y(), single_values[i][1] * single_values[i][2]);
 143
 144     Vector2dF v2 = ScaleVector2d(
 145         gfx::Vector2dF(double_values[i][0], double_values[i][1]),
 146         double_values[i][2]);
 147     EXPECT_EQ(single_values[i][0] * single_values[i][2], v2.x());
 148     EXPECT_EQ(single_values[i][1] * single_values[i][2], v2.y());
 149   }
 150 }
 151
 152 TEST(Vector2dTest, Length) {
 153   int int_values[][2] = {
 154     { 0, 0 },
 155     { 10, 20 },
 156     { 20, 10 },
 157     { -10, -20 },
 158     { -20, 10 },
 159     { 10, -20 },
 160   };
 161
 162   for (size_t i = 0; i < arraysize(int_values); ++i) {
 163     int v0 = int_values[i][0];
 164     int v1 = int_values[i][1];
 165     double length_squared =
 166         static_cast<double>(v0) * v0 + static_cast<double>(v1) * v1;
 167     double length = std::sqrt(length_squared);
 168     Vector2d vector(v0, v1);
 169     EXPECT_EQ(static_cast<float>(length_squared), vector.LengthSquared());
 170     EXPECT_EQ(static_cast<float>(length), vector.Length());
 171   }
 172
 173   float float_values[][2] = {
 174     { 0, 0 },
 175     { 10.5f, 20.5f },
 176     { 20.5f, 10.5f },
 177     { -10.5f, -20.5f },
 178     { -20.5f, 10.5f },
 179     { 10.5f, -20.5f },
 180     // A large vector that fails if the Length function doesn't use
 181     // double precision internally.
 182     { 1236278317862780234892374893213178027.12122348904204230f,
 183       335890352589839028212313231225425134332.38123f },
 184   };
 185
 186   for (size_t i = 0; i < arraysize(float_values); ++i) {
 187     double v0 = float_values[i][0];
 188     double v1 = float_values[i][1];
 189     double length_squared =
 190         static_cast<double>(v0) * v0 + static_cast<double>(v1) * v1;
 191     double length = std::sqrt(length_squared);
 192     Vector2dF vector(v0, v1);
 193     EXPECT_DOUBLE_EQ(length_squared, vector.LengthSquared());
 194     EXPECT_FLOAT_EQ(static_cast<float>(length), vector.Length());
 195   }
 196 }
 197
 198 TEST(Vector2dTest, ClampVector2d) {
 199   Vector2d a;
 200
 201   a = Vector2d(3, 5);
 202   EXPECT_EQ(Vector2d(3, 5).ToString(), a.ToString());
 203   a.SetToMax(Vector2d(2, 4));
 204   EXPECT_EQ(Vector2d(3, 5).ToString(), a.ToString());
 205   a.SetToMax(Vector2d(3, 5));
 206   EXPECT_EQ(Vector2d(3, 5).ToString(), a.ToString());
 207   a.SetToMax(Vector2d(4, 2));
 208   EXPECT_EQ(Vector2d(4, 5).ToString(), a.ToString());
 209   a.SetToMax(Vector2d(8, 10));
 210   EXPECT_EQ(Vector2d(8, 10).ToString(), a.ToString());
 211
 212   a.SetToMin(Vector2d(9, 11));
 213   EXPECT_EQ(Vector2d(8, 10).ToString(), a.ToString());
 214   a.SetToMin(Vector2d(8, 10));
 215   EXPECT_EQ(Vector2d(8, 10).ToString(), a.ToString());
 216   a.SetToMin(Vector2d(11, 9));
 217   EXPECT_EQ(Vector2d(8, 9).ToString(), a.ToString());
 218   a.SetToMin(Vector2d(7, 11));
 219   EXPECT_EQ(Vector2d(7, 9).ToString(), a.ToString());
 220   a.SetToMin(Vector2d(3, 5));
 221   EXPECT_EQ(Vector2d(3, 5).ToString(), a.ToString());
 222 }
 223
 224 TEST(Vector2dTest, ClampVector2dF) {
 225   Vector2dF a;
 226
 227   a = Vector2dF(3.5f, 5.5f);
 228   EXPECT_EQ(Vector2dF(3.5f, 5.5f).ToString(), a.ToString());
 229   a.SetToMax(Vector2dF(2.5f, 4.5f));
 230   EXPECT_EQ(Vector2dF(3.5f, 5.5f).ToString(), a.ToString());
 231   a.SetToMax(Vector2dF(3.5f, 5.5f));
 232   EXPECT_EQ(Vector2dF(3.5f, 5.5f).ToString(), a.ToString());
 233   a.SetToMax(Vector2dF(4.5f, 2.5f));
 234   EXPECT_EQ(Vector2dF(4.5f, 5.5f).ToString(), a.ToString());
 235   a.SetToMax(Vector2dF(8.5f, 10.5f));
 236   EXPECT_EQ(Vector2dF(8.5f, 10.5f).ToString(), a.ToString());
 237
 238   a.SetToMin(Vector2dF(9.5f, 11.5f));
 239   EXPECT_EQ(Vector2dF(8.5f, 10.5f).ToString(), a.ToString());
 240   a.SetToMin(Vector2dF(8.5f, 10.5f));
 241   EXPECT_EQ(Vector2dF(8.5f, 10.5f).ToString(), a.ToString());
 242   a.SetToMin(Vector2dF(11.5f, 9.5f));
 243   EXPECT_EQ(Vector2dF(8.5f, 9.5f).ToString(), a.ToString());
 244   a.SetToMin(Vector2dF(7.5f, 11.5f));
 245   EXPECT_EQ(Vector2dF(7.5f, 9.5f).ToString(), a.ToString());
 246   a.SetToMin(Vector2dF(3.5f, 5.5f));
 247   EXPECT_EQ(Vector2dF(3.5f, 5.5f).ToString(), a.ToString());
 248 }
 249
 250 }  // namespace gfx