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// Copyright 2014 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 <cmath>
#include <limits>
#include "base/basictypes.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/geometry/scroll_offset.h"
namespace gfx {
TEST(ScrollOffsetTest, IsZero) {
ScrollOffset zero(0, 0);
ScrollOffset nonzero(0.1, -0.1);
EXPECT_TRUE(zero.IsZero());
EXPECT_FALSE(nonzero.IsZero());
}
TEST(ScrollOffsetTest, Add) {
ScrollOffset f1(3.1, 5.1);
ScrollOffset f2(4.3, -1.3);
const struct {
ScrollOffset expected;
ScrollOffset actual;
} scroll_offset_tests[] = {
{ ScrollOffset(3.1, 5.1), f1 + ScrollOffset() },
{ ScrollOffset(3.1 + 4.3, 5.1f - 1.3), f1 + f2 },
{ ScrollOffset(3.1 - 4.3, 5.1f + 1.3), f1 - f2 }
};
for (size_t i = 0; i < arraysize(scroll_offset_tests); ++i)
EXPECT_EQ(scroll_offset_tests[i].expected.ToString(),
scroll_offset_tests[i].actual.ToString());
}
TEST(ScrollOffsetTest, Negative) {
const struct {
ScrollOffset expected;
ScrollOffset actual;
} scroll_offset_tests[] = {
{ ScrollOffset(-0.3, -0.3), -ScrollOffset(0.3, 0.3) },
{ ScrollOffset(0.3, 0.3), -ScrollOffset(-0.3, -0.3) },
{ ScrollOffset(-0.3, 0.3), -ScrollOffset(0.3, -0.3) },
{ ScrollOffset(0.3, -0.3), -ScrollOffset(-0.3, 0.3) }
};
for (size_t i = 0; i < arraysize(scroll_offset_tests); ++i)
EXPECT_EQ(scroll_offset_tests[i].expected.ToString(),
scroll_offset_tests[i].actual.ToString());
}
TEST(ScrollOffsetTest, Scale) {
double double_values[][4] = {
{ 4.5, 1.2, 3.3, 5.6 },
{ 4.5, -1.2, 3.3, 5.6 },
{ 4.5, 1.2, 3.3, -5.6 },
{ 4.5, 1.2, -3.3, -5.6 },
{ -4.5, 1.2, 3.3, 5.6 },
{ -4.5, 1.2, 0, 5.6 },
{ -4.5, 1.2, 3.3, 0 },
{ 4.5, 0, 3.3, 5.6 },
{ 0, 1.2, 3.3, 5.6 }
};
for (size_t i = 0; i < arraysize(double_values); ++i) {
ScrollOffset v(double_values[i][0], double_values[i][1]);
v.Scale(double_values[i][2], double_values[i][3]);
EXPECT_EQ(v.x(), double_values[i][0] * double_values[i][2]);
EXPECT_EQ(v.y(), double_values[i][1] * double_values[i][3]);
}
double single_values[][3] = {
{ 4.5, 1.2, 3.3 },
{ 4.5, -1.2, 3.3 },
{ 4.5, 1.2, 3.3 },
{ 4.5, 1.2, -3.3 },
{ -4.5, 1.2, 3.3 },
{ -4.5, 1.2, 0 },
{ -4.5, 1.2, 3.3 },
{ 4.5, 0, 3.3 },
{ 0, 1.2, 3.3 }
};
for (size_t i = 0; i < arraysize(single_values); ++i) {
ScrollOffset v(single_values[i][0], single_values[i][1]);
v.Scale(single_values[i][2]);
EXPECT_EQ(v.x(), single_values[i][0] * single_values[i][2]);
EXPECT_EQ(v.y(), single_values[i][1] * single_values[i][2]);
}
}
TEST(ScrollOffsetTest, ClampScrollOffset) {
ScrollOffset a;
a = ScrollOffset(3.5, 5.5);
EXPECT_EQ(ScrollOffset(3.5, 5.5).ToString(), a.ToString());
a.SetToMax(ScrollOffset(2.5, 4.5));
EXPECT_EQ(ScrollOffset(3.5, 5.5).ToString(), a.ToString());
a.SetToMax(ScrollOffset(3.5, 5.5));
EXPECT_EQ(ScrollOffset(3.5, 5.5).ToString(), a.ToString());
a.SetToMax(ScrollOffset(4.5, 2.5));
EXPECT_EQ(ScrollOffset(4.5, 5.5).ToString(), a.ToString());
a.SetToMax(ScrollOffset(8.5, 10.5));
EXPECT_EQ(ScrollOffset(8.5, 10.5).ToString(), a.ToString());
a.SetToMin(ScrollOffset(9.5, 11.5));
EXPECT_EQ(ScrollOffset(8.5, 10.5).ToString(), a.ToString());
a.SetToMin(ScrollOffset(8.5, 10.5));
EXPECT_EQ(ScrollOffset(8.5, 10.5).ToString(), a.ToString());
a.SetToMin(ScrollOffset(11.5, 9.5));
EXPECT_EQ(ScrollOffset(8.5, 9.5).ToString(), a.ToString());
a.SetToMin(ScrollOffset(7.5, 11.5));
EXPECT_EQ(ScrollOffset(7.5, 9.5).ToString(), a.ToString());
a.SetToMin(ScrollOffset(3.5, 5.5));
EXPECT_EQ(ScrollOffset(3.5, 5.5).ToString(), a.ToString());
}
} // namespace gfx
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