1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using HeuristicLab.Common;
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23 | using HeuristicLab.Core;
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24 | using HeuristicLab.Data;
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25 | using HeuristicLab.Operators;
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26 | using HeuristicLab.Parameters;
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27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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28 |
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29 | namespace HeuristicLab.Random {
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30 | /// <summary>
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31 | /// Uniformly distributed random number generator.
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32 | /// </summary>
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33 | [StorableClass]
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34 | [Item("UniformRandomizer", "Initializes the value of variable 'Value' to a random value uniformly distributed between 'Min' and 'Max'")]
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35 | public class UniformRandomizer : SingleSuccessorOperator {
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36 | #region Parameter Properties
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37 | public ILookupParameter<IRandom> RandomParameter {
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38 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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39 | }
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40 | public IValueLookupParameter<DoubleValue> MinParameter {
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41 | get { return (IValueLookupParameter<DoubleValue>)Parameters["Min"]; }
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42 | }
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43 | public IValueLookupParameter<DoubleValue> MaxParameter {
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44 | get { return (IValueLookupParameter<DoubleValue>)Parameters["Max"]; }
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45 | }
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46 | public ILookupParameter<DoubleValue> ValueParameter {
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47 | get { return (ILookupParameter<DoubleValue>)Parameters["Value"]; }
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48 | }
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49 | #endregion
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50 |
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51 | #region Properties
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52 | public DoubleValue Min {
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53 | get { return MinParameter.ActualValue; }
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54 | set { MinParameter.ActualValue = value; }
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55 | }
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56 | public DoubleValue Max {
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57 | get { return MaxParameter.ActualValue; }
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58 | set { MaxParameter.ActualValue = value; }
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59 | }
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60 | #endregion
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61 |
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62 | [StorableConstructor]
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63 | protected UniformRandomizer(bool deserializing) : base(deserializing) { }
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64 | protected UniformRandomizer(UniformRandomizer original, Cloner cloner) : base(original, cloner) { }
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65 | /// <summary>
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66 | /// Initializes a new instance of <see cref="UniformRandomizer"/> with four variable infos
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67 | /// (<c>Value</c>, <c>Random</c>, <c>Max</c> and <c>Min</c>), being a random number generator
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68 | /// between 0.0 and 1.0.
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69 | /// </summary>
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70 | public UniformRandomizer()
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71 | : base() {
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72 | Parameters.Add(new LookupParameter<IRandom>("Random", "A random generator that supplies uniformly distributed values."));
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73 | Parameters.Add(new ValueLookupParameter<DoubleValue>("Min", "The minimal allowed value (inclusive)"));
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74 | Parameters.Add(new ValueLookupParameter<DoubleValue>("Max", "The maximal allowed value (exclusive)"));
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75 | Parameters.Add(new LookupParameter<DoubleValue>("Value", "The value that should be set to a random value."));
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76 | }
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77 |
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78 | public override IDeepCloneable Clone(Cloner cloner) {
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79 | return new UniformRandomizer(this, cloner);
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80 | }
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81 |
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82 | /// <summary>
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83 | /// Generates a new uniformly distributed random variable.
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84 | /// </summary>
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85 | public override IOperation Apply(IExecutionContext context) {
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86 | IRandom random = RandomParameter.ActualValue;
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87 | double min = MinParameter.ActualValue.Value;
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88 | double max = MaxParameter.ActualValue.Value;
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89 |
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90 | ValueParameter.ActualValue = new DoubleValue(random.NextDouble() * (max - min) + min);
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91 | return null;
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92 | }
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93 | }
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94 | }
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