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