RulePerlin

ldtk.rules.RulePerlin (Class)

2D Perlin noise, ported from hxd.Perlin of the Heaps engine (MIT license, Copyright (c) 2013 Nicolas Cannasse). Only the parts used by the LDtk rule engine are kept. The integer index hash uses 32 bit arithmetic so that every target produces the same values; the rest is plain IEEE double arithmetic.

Static Members

forRules(): RulePerlin

The configuration used by LDtk auto-layer rules

Returns
RulePerlin

Instance Members

repeat: Int
normalize: Bool

Keep result in the [-1, 1] range

adjustScale(size: Int, scale: Float): Float
Name Type
size Int
scale Float
Returns
Float
inlineGradient(seed: Int, x: Float, y: Float): Float
Name Type
seed Int
x Float
y Float
Returns
Float
perlin(seed: Int, x: Float, y: Float, octaves: Int, ?persist: Float = 0.5, ?lacunarity: Float = 2.0): Float
Name Type Default
seed Int
x Float
y Float
octaves Int
persist Float 0.5
lacunarity Float 2.0
Returns
Float
new(): Void

Private Members

NGRADS: Int
GRADIENTS: Array<Float>
gradients: Array<Float>
scurve(a: Float): Float
Name Type
a Float
Returns
Float
linear(a: Float, b: Float, k: Float): Float
Name Type
a Float
b Float
k Float
Returns
Float
gradientAt(x: Float, y: Float, ix: Int, iy: Int, seed: Int): Float
Name Type
x Float
y Float
ix Int
iy Int
seed Int
Returns
Float