diff options
Diffstat (limited to 'chromium/ui/gfx/geometry/cubic_bezier_unittest.cc')
-rw-r--r-- | chromium/ui/gfx/geometry/cubic_bezier_unittest.cc | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/chromium/ui/gfx/geometry/cubic_bezier_unittest.cc b/chromium/ui/gfx/geometry/cubic_bezier_unittest.cc new file mode 100644 index 00000000000..4fd60e87825 --- /dev/null +++ b/chromium/ui/gfx/geometry/cubic_bezier_unittest.cc @@ -0,0 +1,140 @@ +// 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 "ui/gfx/geometry/cubic_bezier.h" + +#include "base/memory/scoped_ptr.h" +#include "testing/gtest/include/gtest/gtest.h" + +namespace gfx { +namespace { + +TEST(CubicBezierTest, Basic) { + CubicBezier function(0.25, 0.0, 0.75, 1.0); + + double epsilon = 0.00015; + + EXPECT_NEAR(function.Solve(0), 0, epsilon); + EXPECT_NEAR(function.Solve(0.05), 0.01136, epsilon); + EXPECT_NEAR(function.Solve(0.1), 0.03978, epsilon); + EXPECT_NEAR(function.Solve(0.15), 0.079780, epsilon); + EXPECT_NEAR(function.Solve(0.2), 0.12803, epsilon); + EXPECT_NEAR(function.Solve(0.25), 0.18235, epsilon); + EXPECT_NEAR(function.Solve(0.3), 0.24115, epsilon); + EXPECT_NEAR(function.Solve(0.35), 0.30323, epsilon); + EXPECT_NEAR(function.Solve(0.4), 0.36761, epsilon); + EXPECT_NEAR(function.Solve(0.45), 0.43345, epsilon); + EXPECT_NEAR(function.Solve(0.5), 0.5, epsilon); + EXPECT_NEAR(function.Solve(0.6), 0.63238, epsilon); + EXPECT_NEAR(function.Solve(0.65), 0.69676, epsilon); + EXPECT_NEAR(function.Solve(0.7), 0.75884, epsilon); + EXPECT_NEAR(function.Solve(0.75), 0.81764, epsilon); + EXPECT_NEAR(function.Solve(0.8), 0.87196, epsilon); + EXPECT_NEAR(function.Solve(0.85), 0.92021, epsilon); + EXPECT_NEAR(function.Solve(0.9), 0.96021, epsilon); + EXPECT_NEAR(function.Solve(0.95), 0.98863, epsilon); + EXPECT_NEAR(function.Solve(1), 1, epsilon); +} + +// Tests that solving the bezier works with knots with y not in (0, 1). +TEST(CubicBezierTest, UnclampedYValues) { + CubicBezier function(0.5, -1.0, 0.5, 2.0); + + double epsilon = 0.00015; + + EXPECT_NEAR(function.Solve(0.0), 0.0, epsilon); + EXPECT_NEAR(function.Solve(0.05), -0.08954, epsilon); + EXPECT_NEAR(function.Solve(0.1), -0.15613, epsilon); + EXPECT_NEAR(function.Solve(0.15), -0.19641, epsilon); + EXPECT_NEAR(function.Solve(0.2), -0.20651, epsilon); + EXPECT_NEAR(function.Solve(0.25), -0.18232, epsilon); + EXPECT_NEAR(function.Solve(0.3), -0.11992, epsilon); + EXPECT_NEAR(function.Solve(0.35), -0.01672, epsilon); + EXPECT_NEAR(function.Solve(0.4), 0.12660, epsilon); + EXPECT_NEAR(function.Solve(0.45), 0.30349, epsilon); + EXPECT_NEAR(function.Solve(0.5), 0.50000, epsilon); + EXPECT_NEAR(function.Solve(0.55), 0.69651, epsilon); + EXPECT_NEAR(function.Solve(0.6), 0.87340, epsilon); + EXPECT_NEAR(function.Solve(0.65), 1.01672, epsilon); + EXPECT_NEAR(function.Solve(0.7), 1.11992, epsilon); + EXPECT_NEAR(function.Solve(0.75), 1.18232, epsilon); + EXPECT_NEAR(function.Solve(0.8), 1.20651, epsilon); + EXPECT_NEAR(function.Solve(0.85), 1.19641, epsilon); + EXPECT_NEAR(function.Solve(0.9), 1.15613, epsilon); + EXPECT_NEAR(function.Solve(0.95), 1.08954, epsilon); + EXPECT_NEAR(function.Solve(1.0), 1.0, epsilon); +} + +TEST(CubicBezierTest, Range) { + double epsilon = 0.00015; + double min, max; + + // Derivative is a constant. + scoped_ptr<CubicBezier> function( + new CubicBezier(0.25, (1.0 / 3.0), 0.75, (2.0 / 3.0))); + function->Range(&min, &max); + EXPECT_EQ(0, min); + EXPECT_EQ(1, max); + + // Derivative is linear. + function.reset(new CubicBezier(0.25, -0.5, 0.75, (-1.0 / 6.0))); + function->Range(&min, &max); + EXPECT_NEAR(min, -0.225, epsilon); + EXPECT_EQ(1, max); + + // Derivative has no real roots. + function.reset(new CubicBezier(0.25, 0.25, 0.75, 0.5)); + function->Range(&min, &max); + EXPECT_EQ(0, min); + EXPECT_EQ(1, max); + + // Derivative has exactly one real root. + function.reset(new CubicBezier(0.0, 1.0, 1.0, 0.0)); + function->Range(&min, &max); + EXPECT_EQ(0, min); + EXPECT_EQ(1, max); + + // Derivative has one root < 0 and one root > 1. + function.reset(new CubicBezier(0.25, 0.1, 0.75, 0.9)); + function->Range(&min, &max); + EXPECT_EQ(0, min); + EXPECT_EQ(1, max); + + // Derivative has two roots in [0,1]. + function.reset(new CubicBezier(0.25, 2.5, 0.75, 0.5)); + function->Range(&min, &max); + EXPECT_EQ(0, min); + EXPECT_NEAR(max, 1.28818, epsilon); + function.reset(new CubicBezier(0.25, 0.5, 0.75, -1.5)); + function->Range(&min, &max); + EXPECT_NEAR(min, -0.28818, epsilon); + EXPECT_EQ(1, max); + + // Derivative has one root < 0 and one root in [0,1]. + function.reset(new CubicBezier(0.25, 0.1, 0.75, 1.5)); + function->Range(&min, &max); + EXPECT_EQ(0, min); + EXPECT_NEAR(max, 1.10755, epsilon); + + // Derivative has one root in [0,1] and one root > 1. + function.reset(new CubicBezier(0.25, -0.5, 0.75, 0.9)); + function->Range(&min, &max); + EXPECT_NEAR(min, -0.10755, epsilon); + EXPECT_EQ(1, max); + + // Derivative has two roots < 0. + function.reset(new CubicBezier(0.25, 0.3, 0.75, 0.633)); + function->Range(&min, &max); + EXPECT_EQ(0, min); + EXPECT_EQ(1, max); + + // Derivative has two roots > 1. + function.reset(new CubicBezier(0.25, 0.367, 0.75, 0.7)); + function->Range(&min, &max); + EXPECT_EQ(0.f, min); + EXPECT_EQ(1.f, max); +} + +} // namespace +} // namespace gfx |