More Fn changes

math/fn.cs

@@ -1,31 +1,12 @@
-// Copyright (c) Xenko contributors (https://xenko.com) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
+using Microsoft.CodeAnalysis.CSharp.Syntax;
-// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
+
-//
-// Copyright (c) 2010-2011 SharpDX - Alexandre Mutel
-// 
-// 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;
 using System.ComponentModel;
 using System.Globalization;
 using System.Runtime.InteropServices;
 using System.Runtime.Serialization;
+
+
 
 namespace math
 {
@@ -38,6 +19,30 @@ namespace math
 			return v < min ? min : v > max ? max : v;
 		}
 
+		static public float LogisticsUnit( float v, float spread = 4.0f, float height = 1.0f )
+		{
+			return LogisticsFull( v, height, spread, 0, 0.1f, -0.5f );
+		}
+
+		static public float LogisticsFull( float v, float height, float spread, float f, float g, float h )
+		{
+			float res = height / (1.0f + (float)Math.Pow( g, (spread * (v+h))) ) + f;
+
+			return res;
+		}
+
+		static public float LogisticsSymmetric( float v, float height = 1.0f, float spread = 3.65f )
+		{
+
+			float fullHeight = height * 2.0f;
+
+			float negF = -height;
+
+			float res = LogisticsFull( v, fullHeight, spread, negF, 0.1f, 0.0f );
+
+			return res;
+		}
+
 		//Tracked these down in Desmos
 		static public float s_a =   0.0f;
 		static public float s_b =   0.155f;