Function pointOnLine

pointOnLine(fromPoint, toPoint, distance): PointXY
Calculates a point on the line from fromPoint to toPoint that is distance units along the length of the line.
Parameters
- fromPoint: PointXY
  First point
- toPoint: PointXY
  Second point
- distance: number
  Distance along the length that the point should be located.
Returns PointXY
Point on the line, in the form { x:..., y:... }.