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add Fix64 random methods

pull/20/head
cosmonaut 2022-05-15 12:16:34 -07:00
parent dd3fb75905
commit 547f7a388e
1 changed files with 19 additions and 0 deletions
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19
src/Math/Fixed/Fix64.cs
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@ -25,6 +25,7 @@ namespace MoonWorks.Math.Fixed
public static readonly Fix64 Pi = new Fix64(PI); public static readonly Fix64 Pi = new Fix64(PI);
public static readonly Fix64 PiOver2 = new Fix64(PI_OVER_2); public static readonly Fix64 PiOver2 = new Fix64(PI_OVER_2);
public static readonly Fix64 PiOver4 = PiOver2 / new Fix64(2);
public static readonly Fix64 PiTimes2 = new Fix64(PI_TIMES_2); public static readonly Fix64 PiTimes2 = new Fix64(PI_TIMES_2);
const int LUT_SIZE = (int)(PI_OVER_2 >> 15); const int LUT_SIZE = (int)(PI_OVER_2 >> 15);
@ -51,6 +52,24 @@ namespace MoonWorks.Math.Fixed
return new Fix64(numerator) / new Fix64(denominator); return new Fix64(numerator) / new Fix64(denominator);
} }
public static Fix64 Random(System.Random random, int max)
{
var fractional = random.Next();
var integral = random.Next(max);
long rawValue = (integral << FRACTIONAL_PLACES) + fractional;
return new Fix64(rawValue);
}
// Max should be between 0.0 and 1.0.
public static Fix64 RandomFraction(System.Random random, Fix64 max)
{
long fractionalPart = (max.RawValue & 0x00000000FFFFFFFF);
long fractional = random.NextInt64(fractionalPart);
return new Fix64(fractional);
}
/// <summary> /// <summary>
/// Returns an int indicating the sign of a Fix64 number. /// Returns an int indicating the sign of a Fix64 number.
/// </summary> /// </summary>