Understanding the gp:RedefinePolyBorder Function
following pseudo-code shows the logic behind the main function, gp:RedefinePolyBorder:
Extract the previous polyline corner points (12, 13, 14, and 15
Find the moved corner point by comparing the previous
polyline corner points with the current corner points.
(The one "misfit" point will be the point that moved.)
Set the new corner points by recalculating the two points
adjacent to the moved point.
Update the new corner points in the reactor data (that will
be stored back in the reactor for the modified polyline).
Update other information in the reactor data. (Start point,
endpoint, width, and length of path need to be recalculated.)