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 // 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( 52 0.25, 0.1, 0.25, 1.0).PassAs<TimingFunction>(); 53 } 54 55 scoped_ptr<TimingFunction> EaseInTimingFunction::Create() { 56 return CubicBezierTimingFunction::Create( 57 0.42, 0.0, 1.0, 1.0).PassAs<TimingFunction>(); 58 } 59 60 scoped_ptr<TimingFunction> EaseOutTimingFunction::Create() { 61 return CubicBezierTimingFunction::Create( 62 0.0, 0.0, 0.58, 1.0).PassAs<TimingFunction>(); 63 } 64 65 scoped_ptr<TimingFunction> EaseInOutTimingFunction::Create() { 66 return CubicBezierTimingFunction::Create( 67 0.42, 0.0, 0.58, 1).PassAs<TimingFunction>(); 68 } 69 70 } // namespace cc 71
