public static Generator Filter(this Generator gen, params FilterType[] types)
{
foreach (var type in types)
{
var tempGen = gen;
switch (type)
{
case FilterType.Invert:
gen = new Function(
x => 1 - tempGen.Get(x),
xy => 1 - tempGen.Get(xy),
xyz => 1 - tempGen.Get(xyz));
break;
case FilterType.Billow:
gen = new Function(
x => Maths.Abs((2 * tempGen.Get(x)) - 1),
xy => Maths.Abs((2 * tempGen.Get(xy)) - 1),
xyz => Maths.Abs((2 * tempGen.Get(xyz)) - 1));
break;
case FilterType.Ridged:
gen = gen.Filter(FilterType.Billow, FilterType.Invert);
break;
case FilterType.Sin:
gen = new Function(
x => (Maths.Sin(2 * math.PI * tempGen.Get(x)) / 2) + .5f,
xy => (Maths.Sin(2 * math.PI * tempGen.Get(xy)) / 2) + .5f,
xyz => (Maths.Sin(2 * math.PI * tempGen.Get(xyz)) / 2) + .5f);
break;
case FilterType.Asin:
gen = new Function(
x => (Maths.Asin((2 * tempGen.Get(x)) - 1) / math.PI) + .5f,
xy => (Maths.Asin((2 * tempGen.Get(xy)) - 1) / math.PI) + .5f,
xyz => (Maths.Asin((2 * tempGen.Get(xyz)) - 1) / math.PI) + .5f);
break;
case FilterType.Atan:
gen = new Function(
x => (2 * Maths.Atan((2 * tempGen.Get(x)) - 1) / math.PI) + .5f,
xy => (2 * Maths.Atan((2 * tempGen.Get(xy)) - 1) / math.PI) + .5f,
xyz => (2 * Maths.Atan((2 * tempGen.Get(xyz)) - 1) / math.PI) + .5f);
break;
case FilterType.Tanh:
gen = new Function(
x => 2 * Maths.Tanh(2 * tempGen.Get(x) - 1) / 2 + .5f,
xy => 2 * Maths.Tanh(2 * tempGen.Get(xy) - 1) / 2 + .5f,
xyz => 2 * Maths.Tanh(2 * tempGen.Get(xyz) - 1) / 2 + .5f);
break;
default:
throw new ArgumentException($"Invalid filter type: '{type.ToString()}'");
}
}
return(gen);
}
