Function Perlin

Perlin(X, Y): number
2D Perlin 噪声
Parameters
- X: number
  
  X 坐标 (范围 [0, 1] )
- Y: number
  
  Y 坐标 (范围 [0, 1] )
Returns number
- 返回值范围在 [-1, 1] 之间
Example
```
const noise = Perlin(0.5, 0.5);
console.log(noise);
```
- Defined in src/coverage/Noise.ts:78

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