Index: sky/framework/fling-curve.sky |
diff --git a/sky/framework/fling-curve.sky b/sky/framework/fling-curve.sky |
deleted file mode 100644 |
index 1c13908b4f974ad9427238b977794ed67dc1e1ad..0000000000000000000000000000000000000000 |
--- a/sky/framework/fling-curve.sky |
+++ /dev/null |
@@ -1,47 +0,0 @@ |
-<!-- |
-// Copyright 2015 The Chromium Authors. All rights reserved. |
-// Use of this source code is governed by a BSD-style license that can be |
-// found in the LICENSE file. |
---> |
-<script> |
-const kDefaultAlpha = -5707.62; |
-const kDefaultBeta = 172; |
-const kDefaultGamma = 3.7; |
- |
-function positionAtTime(t) { |
- return kDefaultAlpha * Math.exp(-kDefaultGamma * t) - kDefaultBeta * t - kDefaultAlpha; |
-} |
- |
-function velocityAtTime(t) { |
- return -kDefaultAlpha * kDefaultGamma * Math.exp(-kDefaultGamma * t) - kDefaultBeta; |
-} |
- |
-function timeAtVelocity(v) { |
- return -Math.log((v + kDefaultBeta) / (-kDefaultAlpha * kDefaultGamma)) / kDefaultGamma; |
-} |
- |
-var kMaxVelocity = velocityAtTime(0); |
-var kCurveDuration = timeAtVelocity(0); |
- |
-module.exports = class FlingCurve { |
- constructor(velocity, startTime) { |
- var startingVelocity = Math.min(kMaxVelocity, Math.abs(velocity)); |
- this.timeOffset_ = timeAtVelocity(startingVelocity); |
- this.positionOffset_ = positionAtTime(this.timeOffset_); |
- this.startTime_ = startTime / 1000; |
- this.previousPosition_ = 0; |
- this.direction_ = Math.sign(velocity); |
- Object.preventExtensions(this); |
- } |
- |
- update(timeStamp) { |
- var t = timeStamp / 1000 - this.startTime_ + this.timeOffset_; |
- if (t >= kCurveDuration) |
- return 0; |
- var position = positionAtTime(t) - this.positionOffset_; |
- var positionDelta = position - this.previousPosition_; |
- this.previousPosition_ = position; |
- return this.direction_ * Math.max(0, positionDelta); |
- } |
-}; |
-</script> |