Function interpolate

Compute relative position on arc

Param: arc

Arc

Param: amount

Relative position 0-1

Param: origin

If arc is not positioned, pass in an origin

Returns

interpolate(amount, arc, origin): Point
Parameters
- amount: number
- arc: Arc
- origin: Point
Returns Point
interpolate(amount, arc): Point
Parameters
- amount: number
- arc: ArcPositioned
Returns Point