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 9namespace cc { 10 11TimingFunction::TimingFunction() {} 12 13TimingFunction::~TimingFunction() {} 14 15scoped_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 20CubicBezierTimingFunction::CubicBezierTimingFunction(double x1, 21 double y1, 22 double x2, 23 double y2) 24 : bezier_(x1, y1, x2, y2) {} 25 26CubicBezierTimingFunction::~CubicBezierTimingFunction() {} 27 28float CubicBezierTimingFunction::GetValue(double x) const { 29 return static_cast<float>(bezier_.Solve(x)); 30} 31 32float CubicBezierTimingFunction::Velocity(double x) const { 33 return static_cast<float>(bezier_.Slope(x)); 34} 35 36void 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 44scoped_ptr<TimingFunction> CubicBezierTimingFunction::Clone() const { 45 return make_scoped_ptr(new CubicBezierTimingFunction(*this)) 46 .PassAs<TimingFunction>(); 47} 48 49// These numbers come from 50// http://www.w3.org/TR/css3-transitions/#transition-timing-function_tag. 51scoped_ptr<TimingFunction> EaseTimingFunction::Create() { 52 return CubicBezierTimingFunction::Create( 53 0.25, 0.1, 0.25, 1.0).PassAs<TimingFunction>(); 54} 55 56scoped_ptr<TimingFunction> EaseInTimingFunction::Create() { 57 return CubicBezierTimingFunction::Create( 58 0.42, 0.0, 1.0, 1.0).PassAs<TimingFunction>(); 59} 60 61scoped_ptr<TimingFunction> EaseOutTimingFunction::Create() { 62 return CubicBezierTimingFunction::Create( 63 0.0, 0.0, 0.58, 1.0).PassAs<TimingFunction>(); 64} 65 66scoped_ptr<TimingFunction> EaseInOutTimingFunction::Create() { 67 return CubicBezierTimingFunction::Create( 68 0.42, 0.0, 0.58, 1).PassAs<TimingFunction>(); 69} 70 71} // namespace cc 72