Function boxIntersection

boxIntersection(x, y, w, h, curve): PointXY[]
Calculates all intersections of the given box with the given curve.
Parameters
- x: number
  X position of top left corner of box
- y: number
  Y position of top left corner of box
- w: number
  width of box
- h: number
  height of box
- curve: Curve
Returns PointXY[]
Array of intersecting points.

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