src/cc/animation/timing_function.cc

   1 // Copyright 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 "base/logging.h"
   6 #include "cc/animation/timing_function.h"
   7
   8 namespace cc {
   9
  10 TimingFunction::TimingFunction() {}
  11
  12 TimingFunction::~TimingFunction() {}
  13
  14 double TimingFunction::Duration() const {
  15   return 1.0;
  16 }
  17
  18 scoped_ptr<CubicBezierTimingFunction> CubicBezierTimingFunction::Create(
  19     double x1, double y1, double x2, double y2) {
  20   return make_scoped_ptr(new CubicBezierTimingFunction(x1, y1, x2, y2));
  21 }
  22
  23 CubicBezierTimingFunction::CubicBezierTimingFunction(double x1,
  24                                                      double y1,
  25                                                      double x2,
  26                                                      double y2)
  27     : bezier_(x1, y1, x2, y2) {}
  28
  29 CubicBezierTimingFunction::~CubicBezierTimingFunction() {}
  30
  31 float CubicBezierTimingFunction::GetValue(double x) const {
  32   return static_cast<float>(bezier_.Solve(x));
  33 }
  34
  35 scoped_ptr<AnimationCurve> CubicBezierTimingFunction::Clone() const {
  36   return make_scoped_ptr(
  37       new CubicBezierTimingFunction(*this)).PassAs<AnimationCurve>();
  38 }
  39
  40 void CubicBezierTimingFunction::Range(float* min, float* max) const {
  41   double min_d = 0;
  42   double max_d = 1;
  43   bezier_.Range(&min_d, &max_d);
  44   *min = static_cast<float>(min_d);
  45   *max = static_cast<float>(max_d);
  46 }
  47
  48 float CubicBezierTimingFunction::Velocity(double x) const {
  49   return static_cast<float>(bezier_.Slope(x));
  50 }
  51
  52 // These numbers come from
  53 // http://www.w3.org/TR/css3-transitions/#transition-timing-function_tag.
  54 scoped_ptr<TimingFunction> EaseTimingFunction::Create() {
  55   return CubicBezierTimingFunction::Create(
  56       0.25, 0.1, 0.25, 1.0).PassAs<TimingFunction>();
  57 }
  58
  59 scoped_ptr<TimingFunction> EaseInTimingFunction::Create() {
  60   return CubicBezierTimingFunction::Create(
  61       0.42, 0.0, 1.0, 1.0).PassAs<TimingFunction>();
  62 }
  63
  64 scoped_ptr<TimingFunction> EaseOutTimingFunction::Create() {
  65   return CubicBezierTimingFunction::Create(
  66       0.0, 0.0, 0.58, 1.0).PassAs<TimingFunction>();
  67 }
  68
  69 scoped_ptr<TimingFunction> EaseInOutTimingFunction::Create() {
  70   return CubicBezierTimingFunction::Create(
  71       0.42, 0.0, 0.58, 1).PassAs<TimingFunction>();
  72 }
  73
  74 }  // namespace cc