Function interpolatePoint

interpolatePoint(a: number[], b: number[], fraction: number): number[]
Interpolates between two points represented as arrays of two numbers.
Parameters
- a: number[]
  The starting point [x, y].
- b: number[]
  The ending point [x, y].
- fraction: number
  The interpolation fraction (0 to 1).
Returns number[]
The interpolated point.