HeuristicLab.Optimization.Operators/3.3/QuadraticDiscreteDoubleValueModifier.cs

   1 #region License Information
   2 /* HeuristicLab
   3  * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
   4  *
   5  * This file is part of HeuristicLab.
   6  *
   7  * HeuristicLab is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * HeuristicLab is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #endregion
  21
  22 using HeuristicLab.Common;
  23 using HeuristicLab.Core;
  24 using HEAL.Attic;
  25
  26 namespace HeuristicLab.Optimization.Operators {
  27   /// <summary>
  28   /// Modifies the value by quadratic fall (slow fall initially, fast fall to the end) or rise (slow rise initally, fast rise to the end).
  29   /// </summary>
  30   [Item("QuadraticDiscreteDoubleValueModifier", "Modifies the value by quadratic fall (slow fall initially, fast fall to the end) or rise (slow rise initally, fast rise to the end).")]
  31   [StorableType("49CADD22-7074-4ADB-AA7B-36D03115FB1A")]
  32   public class QuadraticDiscreteDoubleValueModifier : DiscreteDoubleValueModifier {
  33     [StorableConstructor]
  34     protected QuadraticDiscreteDoubleValueModifier(StorableConstructorFlag _) : base(_) { }
  35     protected QuadraticDiscreteDoubleValueModifier(QuadraticDiscreteDoubleValueModifier original, Cloner cloner) : base(original, cloner) { }
  36     public QuadraticDiscreteDoubleValueModifier() : base() { }
  37
  38     public override IDeepCloneable Clone(Cloner cloner) {
  39       return new QuadraticDiscreteDoubleValueModifier(this, cloner);
  40     }
  41
  42     protected override double Modify(double value, double startValue, double endValue, int index, int startIndex, int endIndex) {
  43       return Apply(value, startValue, endValue, index, startIndex, endIndex);
  44     }
  45
  46     /// <summary>
  47     /// Calculates a new value based on quadratic decay or growth.
  48     /// </summary>
  49     /// <param name="value">The previous value.</param>
  50     /// <param name="startValue">The initial value.</param>
  51     /// <param name="endValue">The final value.</param>
  52     /// <param name="index">The current index.</param>
  53     /// <param name="startIndex">The initial index.</param>
  54     /// <param name="endIndex">The final index.</param>
  55     /// <returns>The new value.</returns>
  56     public static double Apply(double value, double startValue, double endValue, int index, int startIndex, int endIndex) {
  57       double a = (endValue - startValue) / ((endIndex - startIndex) * (endIndex - startIndex));
  58       return a * (index - startIndex) * (index - startIndex) + startValue;
  59     }
  60   }
  61 }