transform_animation_curve_adapter_unittest.cc revision d0247b1b59f9c528cb6df88b4f2b9afaf80d181e 
1// Copyright 2013 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 "ui/compositor/transform_animation_curve_adapter.h"
6
7#include <sstream>
8
9#include "base/time/time.h"
10#include "testing/gtest/include/gtest/gtest.h"
11#include "ui/compositor/test/test_utils.h"
12
13namespace ui {
14
15namespace {
16
17// Check that the inverse transform curve gives the gives a transform that when
18// applied on top of the parent transform gives the original transform
19TEST(InverseTransformCurveAdapterTest, InversesTransform) {
20  gfx::Transform parent_start, parent_target;
21  parent_start.Scale(0.5, 3.0);
22  parent_start.Translate(-20.0, 30.0);
23  parent_target.Translate(0, 100);
24
25  gfx::Transform child_transform;
26  child_transform.Rotate(-30.0);
27
28  base::TimeDelta duration = base::TimeDelta::FromSeconds(1);
29
30  const gfx::Transform effective_child_transform =
31      parent_start * child_transform;
32
33  TransformAnimationCurveAdapter parent_curve(gfx::Tween::LINEAR,
34                                              parent_start,
35                                              parent_target,
36                                              duration);
37
38  InverseTransformCurveAdapter child_curve(parent_curve,
39                                           child_transform,
40                                           duration);
41  static const int kSteps = 1000;
42  double step = 1.0 / kSteps;
43  for (int i = 0; i <= kSteps ; ++i) {
44    std::ostringstream message;
45    message << "Step " << i << " of " << kSteps;
46    SCOPED_TRACE(message.str());
47    gfx::Transform progress_parent_transform =
48            parent_curve.GetValue(i*step);
49    gfx::Transform progress_child_transform =
50            child_curve.GetValue(i*step);
51    CheckApproximatelyEqual(effective_child_transform,
52                            progress_parent_transform *
53                            progress_child_transform);
54  }
55}
56
57} // namespace
58
59} // namespace ui
60