PerlinNoiseShader

class PerlinNoiseShader

PerlinNoiseShader creates an image using the Perlin turbulence function.

It can produce tileable noise if asked to stitch tiles and provided a tile size. In order to fill a large area with repeating noise, set the stitchTiles flag to true, and render exactly a single tile of noise. Without this flag, the result will contain visible seams between tiles.

The algorithm used is described here: http://www.w3.org/TR/SVG/filters.html#feTurbulenceElement

Methods

`MakeFractalNoise`	This will construct Perlin noise of the given type (Fractal Noise or Turbulence).
`MakeTurbulence`
`__init__`

Methods

static PerlinNoiseShader.MakeFractalNoise(baseFrequencyX: float, baseFrequencyY: float, numOctaves: int, seed: float, tileSize: skia.ISize = None) → skia.Shader

This will construct Perlin noise of the given type (Fractal Noise or Turbulence).

Both base frequencies (X and Y) have a usual range of (0..1) and must be non-negative.

The number of octaves provided should be fairly small, with a limit of 255 enforced. Each octave doubles the frequency, so 10 octaves would produce noise from baseFrequency * 1, * 2, * 4, …, * 512, which quickly yields insignificantly small periods and resembles regular unstructured noise rather than Perlin noise.

If tileSize isn’t NULL or an empty size, the tileSize parameter will be used to modify the frequencies so that the noise will be tileable for the given tile size. If tileSize is NULL or an empty size, the frequencies will be used as is without modification.

static PerlinNoiseShader.MakeTurbulence(baseFrequencyX: float, baseFrequencyY: float, numOctaves: int, seed: float, tileSize: skia.ISize = None) → skia.Shader

PerlinNoiseShader.__init__(*args, **kwargs)