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authorJason Smith <jason.smith@xamarin.com>2016-03-22 13:02:25 -0700
committerJason Smith <jason.smith@xamarin.com>2016-03-22 16:13:41 -0700
commit17fdde66d94155fc62a034fa6658995bef6fd6e5 (patch)
treeb5e5073a2a7b15cdbe826faa5c763e270a505729 /Xamarin.Forms.Core/Easing.cs
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+//
+// Tweener.cs
+//
+// Author:
+// Jason Smith <jason.smith@xamarin.com>
+//
+// Copyright (c) 2012 Xamarin Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System;
+
+namespace Xamarin.Forms
+{
+ public class Easing
+ {
+ public static readonly Easing Linear = new Easing(x => x);
+
+ public static readonly Easing SinOut = new Easing(x => Math.Sin(x * Math.PI * 0.5f));
+ public static readonly Easing SinIn = new Easing(x => 1.0f - Math.Cos(x * Math.PI * 0.5f));
+ public static readonly Easing SinInOut = new Easing(x => -Math.Cos(Math.PI * x) / 2.0f + 0.5f);
+
+ public static readonly Easing CubicIn = new Easing(x => x * x * x);
+ public static readonly Easing CubicOut = new Easing(x => Math.Pow(x - 1.0f, 3.0f) + 1.0f);
+
+ public static readonly Easing CubicInOut = new Easing(x => x < 0.5f ? Math.Pow(x * 2.0f, 3.0f) / 2.0f : (Math.Pow((x - 1) * 2.0f, 3.0f) + 2.0f) / 2.0f);
+
+ public static readonly Easing BounceOut;
+ public static readonly Easing BounceIn;
+
+ public static readonly Easing SpringIn = new Easing(x => x * x * ((1.70158f + 1) * x - 1.70158f));
+ public static readonly Easing SpringOut = new Easing(x => (x - 1) * (x - 1) * ((1.70158f + 1) * (x - 1) + 1.70158f) + 1);
+
+ readonly Func<double, double> _easingFunc;
+
+ static Easing()
+ {
+ BounceOut = new Easing(p =>
+ {
+ if (p < 1 / 2.75f)
+ {
+ return 7.5625f * p * p;
+ }
+ if (p < 2 / 2.75f)
+ {
+ p -= 1.5f / 2.75f;
+
+ return 7.5625f * p * p + .75f;
+ }
+ if (p < 2.5f / 2.75f)
+ {
+ p -= 2.25f / 2.75f;
+
+ return 7.5625f * p * p + .9375f;
+ }
+ p -= 2.625f / 2.75f;
+
+ return 7.5625f * p * p + .984375f;
+ });
+
+ BounceIn = new Easing(p => 1.0f - BounceOut.Ease(1 - p));
+ }
+
+ public Easing(Func<double, double> easingFunc)
+ {
+ if (easingFunc == null)
+ throw new ArgumentNullException("easingFunc");
+
+ _easingFunc = easingFunc;
+ }
+
+ public double Ease(double v)
+ {
+ return _easingFunc(v);
+ }
+
+ public static implicit operator Easing(Func<double, double> func)
+ {
+ return new Easing(func);
+ }
+ }
+} \ No newline at end of file