src/ui/compositor/float_animation_curve_adapter.cc

   1 // Copyright (c) 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 "ui/compositor/float_animation_curve_adapter.h"
   6
   7 namespace ui {
   8
   9 FloatAnimationCurveAdapter::FloatAnimationCurveAdapter(
  10     gfx::Tween::Type tween_type,
  11     float initial_value,
  12     float target_value,
  13     base::TimeDelta duration)
  14     : tween_type_(tween_type),
  15       initial_value_(initial_value),
  16       target_value_(target_value),
  17       duration_(duration) {
  18 }
  19
  20 double FloatAnimationCurveAdapter::Duration() const {
  21   return duration_.InSecondsF();
  22 }
  23
  24 scoped_ptr<cc::AnimationCurve> FloatAnimationCurveAdapter::Clone() const {
  25   scoped_ptr<FloatAnimationCurveAdapter> to_return(
  26       new FloatAnimationCurveAdapter(tween_type_,
  27                                      initial_value_,
  28                                      target_value_,
  29                                      duration_));
  30   return to_return.PassAs<cc::AnimationCurve>();
  31 }
  32
  33 float FloatAnimationCurveAdapter::GetValue(double t) const {
  34   if (t >= duration_.InSecondsF())
  35     return target_value_;
  36   if (t <= 0.0)
  37     return initial_value_;
  38   double progress = t / duration_.InSecondsF();
  39   return gfx::Tween::FloatValueBetween(
  40       gfx::Tween::CalculateValue(tween_type_, progress),
  41       initial_value_,
  42       target_value_);
  43 }
  44
  45 }  // namespace ui