1f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)// Copyright 2013 The Chromium Authors. All rights reserved. 2f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 3f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)// found in the LICENSE file. 4f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 5f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "cc/animation/scroll_offset_animation_curve.h" 6f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 7a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#include <algorithm> 8a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#include <cmath> 9a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 10f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "base/logging.h" 11f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "cc/animation/timing_function.h" 12f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "ui/gfx/animation/tween.h" 13f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 14a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)const double kDurationDivisor = 60.0; 15a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 16f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)namespace cc { 17f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)namespace { 195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static float MaximumDimension(gfx::Vector2dF delta) { 215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return std::max(std::abs(delta.x()), std::abs(delta.y())); 225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static base::TimeDelta DurationFromDelta(gfx::Vector2dF delta) { 255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // The duration of a scroll animation depends on the size of the scroll. 265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // The exact relationship between the size and the duration isn't specified 275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // by the CSSOM View smooth scroll spec and is instead left up to user agents 285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // to decide. The calculation performed here will very likely be further 295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // tweaked before the smooth scroll API ships. 305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return base::TimeDelta::FromMicroseconds( 315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) (std::sqrt(MaximumDimension(delta)) / kDurationDivisor) * 325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) base::Time::kMicrosecondsPerSecond); 335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static scoped_ptr<TimingFunction> EaseOutWithInitialVelocity(double velocity) { 365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Based on EaseInOutTimingFunction::Create with first control point rotated. 375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const double r2 = 0.42 * 0.42; 385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const double v2 = velocity * velocity; 395f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const double x1 = std::sqrt(r2 / (v2 + 1)); 405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const double y1 = std::sqrt(r2 * v2 / (v2 + 1)); 415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return CubicBezierTimingFunction::Create(x1, y1, 0.58, 1) 425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) .PassAs<TimingFunction>(); 435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} // namespace 465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 47f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)scoped_ptr<ScrollOffsetAnimationCurve> ScrollOffsetAnimationCurve::Create( 485d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const gfx::Vector2dF& target_value, 49f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) scoped_ptr<TimingFunction> timing_function) { 50f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return make_scoped_ptr( 51f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) new ScrollOffsetAnimationCurve(target_value, timing_function.Pass())); 52f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} 53f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 54f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)ScrollOffsetAnimationCurve::ScrollOffsetAnimationCurve( 555d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const gfx::Vector2dF& target_value, 56f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) scoped_ptr<TimingFunction> timing_function) 57cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) : target_value_(target_value), timing_function_(timing_function.Pass()) { 58cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles)} 59f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 60f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)ScrollOffsetAnimationCurve::~ScrollOffsetAnimationCurve() {} 61f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 625d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)void ScrollOffsetAnimationCurve::SetInitialValue( 635d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const gfx::Vector2dF& initial_value) { 64a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) initial_value_ = initial_value; 655f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) total_animation_duration_ = DurationFromDelta(target_value_ - initial_value_); 66a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 67a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 68f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)gfx::Vector2dF ScrollOffsetAnimationCurve::GetValue(double t) const { 695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) double duration = (total_animation_duration_ - last_retarget_).InSecondsF(); 705f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) t -= last_retarget_.InSecondsF(); 71cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) 72f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (t <= 0) 73f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return initial_value_; 74f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 75cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) if (t >= duration) 76f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return target_value_; 77f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 78cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) double progress = (timing_function_->GetValue(t / duration)); 79f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return gfx::Vector2dF(gfx::Tween::FloatValueBetween( 80f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) progress, initial_value_.x(), target_value_.x()), 81f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) gfx::Tween::FloatValueBetween( 82f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) progress, initial_value_.y(), target_value_.y())); 83f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} 84f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 85f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)double ScrollOffsetAnimationCurve::Duration() const { 865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return total_animation_duration_.InSecondsF(); 87f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} 88f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 89f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)AnimationCurve::CurveType ScrollOffsetAnimationCurve::Type() const { 90f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return ScrollOffset; 91f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} 92f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 93f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)scoped_ptr<AnimationCurve> ScrollOffsetAnimationCurve::Clone() const { 94f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) scoped_ptr<TimingFunction> timing_function( 95f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) static_cast<TimingFunction*>(timing_function_->Clone().release())); 96f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) scoped_ptr<ScrollOffsetAnimationCurve> curve_clone = 97f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) Create(target_value_, timing_function.Pass()); 98a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) curve_clone->initial_value_ = initial_value_; 995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) curve_clone->total_animation_duration_ = total_animation_duration_; 1005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) curve_clone->last_retarget_ = last_retarget_; 101f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return curve_clone.PassAs<AnimationCurve>(); 102f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} 103f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 1045f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)void ScrollOffsetAnimationCurve::UpdateTarget( 1055f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) double t, 1065f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const gfx::Vector2dF& new_target) { 1075f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) gfx::Vector2dF current_position = GetValue(t); 1085f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) gfx::Vector2dF old_delta = target_value_ - initial_value_; 1095f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) gfx::Vector2dF new_delta = new_target - current_position; 1105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) double old_duration = 1125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) (total_animation_duration_ - last_retarget_).InSecondsF(); 1135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) double new_duration = DurationFromDelta(new_delta).InSecondsF(); 1145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) double old_velocity = timing_function_->Velocity( 1165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) (t - last_retarget_.InSecondsF()) / old_duration); 1175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // TimingFunction::Velocity gives the slope of the curve from 0 to 1. 1195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // To match the "true" velocity in px/sec we must adjust this slope for 1205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // differences in duration and scroll delta between old and new curves. 1215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) double new_velocity = 1225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) old_velocity * (new_duration / old_duration) * 1235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) (MaximumDimension(old_delta) / MaximumDimension(new_delta)); 1245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) initial_value_ = current_position; 1265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) target_value_ = new_target; 1275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) total_animation_duration_ = base::TimeDelta::FromSecondsD(t + new_duration); 1285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) last_retarget_ = base::TimeDelta::FromSecondsD(t); 1295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) timing_function_ = EaseOutWithInitialVelocity(new_velocity); 1305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 1315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 132f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} // namespace cc 133