source: addons/HeuristicLab.MetaOptimization/HeuristicLab.Problems.MetaOptimization/3.3/Encoding/RangeConstraints/PercentValueRange.cs @ 17104

using System;
using System.Collections.Generic;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HEAL.Attic;

namespace HeuristicLab.Problems.MetaOptimization {
  [StorableType("0A899E4E-9BC6-4A29-B015-F529C94BF752")]
  public class PercentValueRange : Range<PercentValue> {

    public PercentValueRange(PercentValue lowerBound, PercentValue upperBound, PercentValue stepSize) : base(lowerBound, upperBound, stepSize) { }
    [StorableConstructor]
    protected PercentValueRange(StorableConstructorFlag _) : base(_) { }
    protected PercentValueRange(PercentValueRange original, Cloner cloner) : base(original, cloner) { }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new PercentValueRange(this, cloner);
    }

    protected override PercentValue GetRandomSample(IRandom random) {
      double val;
      do {
        val = Math.Round((random.NextDouble() * (UpperBound.Value - LowerBound.Value) + LowerBound.Value) / StepSize.Value, 0) * StepSize.Value;
      } while (!IsInRange(val));
      return new PercentValue(val);
    }

    public DoubleValueRange AsDoubleValueRange() {
      return new DoubleValueRange(LowerBound, UpperBound, StepSize);
    }

    public double ApplyStepSize(double value) {
      return ((int)Math.Round(value / this.StepSize.Value, 0)) * this.StepSize.Value;
    }

    public bool IsInRange(double value) {
      return value <= this.UpperBound.Value && value >= this.LowerBound.Value;
    }

    public override IEnumerable<PercentValue> GetCombinations() {
      var solutions = new List<PercentValue>();
      double value = LowerBound.Value;

      while (value <= UpperBound.Value) {
        solutions.Add(new PercentValue(value));
        value += StepSize.Value;
        value = ApplyStepSize(value);
      }
      return solutions;
    }

    protected override double CalculateSimilarityValue(PercentValue a, PercentValue b) {
      double range = UpperBound.Value - LowerBound.Value;
      double diff = Math.Abs(a.Value - b.Value);
      return Math.Max(0, (range - (diff * 2)) / range);
    }
  }
}