PseudoRandom Class

Delta Engine Documentation

Default implementation of Randomizer, returns quick random integers and floats (faster than System.Random). See http://www.codeproject.com/Articles/25172/Simple-Random-Number-Generation which is based on: http://www.bobwheeler.com/statistics/Password/MarsagliaPost.txt View code on GitHub

Inheritance Hierarchy

System Object
DeltaEngine.Core Randomizer
DeltaEngine.Core PseudoRandom

Namespace: DeltaEngine.Core
Assembly: DeltaEngine (in DeltaEngine.dll) Version: 1.1.1.0 (1.1.1)

Syntax

C++

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public class PseudoRandom : Randomizer

public class PseudoRandom : Randomizer

Public Class PseudoRandom 
	Inherits Randomizer

Public Class PseudoRandom 
	Inherits Randomizer

public ref class PseudoRandom : public Randomizer

public ref class PseudoRandom : public Randomizer

type PseudoRandom =  
    class 
        inherit Randomizer 
    end

type PseudoRandom =  
    class 
        inherit Randomizer 
    end

The PseudoRandom type exposes the following members.

Constructors

	Name	Description
	PseudoRandom	Initializes a new instance of the PseudoRandom class

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Methods

	Name	Description
	Get(Int32, Int32)	(Overrides Randomizer Get(Int32, Int32).)
	Get(Single, Single)	(Overrides Randomizer Get(Single, Single).)

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Remarks

Tests: DeltaEngine.Tests.Core.PseudoRandomTests

Examples

4 unit tests call DeltaEngine.Core.PseudoRandom

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[Test]
public void UseDefaultRandomizer()
{
    Assert.Less(Randomizer.Current.Get(1, 100), 100);
}

[Test]
public void UseDefaultRandomizer()
{
    Assert.Less(Randomizer.Current.Get(1, 100), 100);
}

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[Test]
public void GetRandomBrightColorUsingFixedRandomValues()
{
    using (Randomizer.Use(new FixedRandom(new[] { 0.0f, 0.5f})))
    {
        Assert.AreEqual(0, Randomizer.Current.Get(0, 10));
        Assert.AreEqual(5, Randomizer.Current.Get(0, 10));
        Assert.AreEqual(2, Randomizer.Current.Get(2, 4));
    }
}

[Test]
public void GetRandomBrightColorUsingFixedRandomValues()
{
    using (Randomizer.Use(new FixedRandom(new[] { 0.0f, 0.5f})))
    {
        Assert.AreEqual(0, Randomizer.Current.Get(0, 10));
        Assert.AreEqual(5, Randomizer.Current.Get(0, 10));
        Assert.AreEqual(2, Randomizer.Current.Get(2, 4));
    }
}

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[Test, Category("Slow")]
public void RandomIntSanityTest()
{
    var random = new PseudoRandom();
    const int Max = 10;
    var wasChosen = new bool[Max];
    const int Trials = Max * 1000;
    for (int i = 0; i < Trials; i++)
        wasChosen[random.Get(0, Max)] = true;
    for (int i = 0; i < Max; i++)
        Assert.IsTrue(wasChosen[i]);
}

[Test, Category("Slow")]
public void RandomIntSanityTest()
{
    var random = new PseudoRandom();
    const int Max = 10;
    var wasChosen = new bool[Max];
    const int Trials = Max * 1000;
    for (int i = 0; i < Trials; i++)
        wasChosen[random.Get(0, Max)] = true;
    for (int i = 0; i < Max; i++)
        Assert.IsTrue(wasChosen[i]);
}