Can anyone help me how to get the outside segment of a shape...
Inside segment will be disregard. Thanks
There is a quick and nasty way that might work for you:
Use axlPolyExpand, with an expandValue slightly bigger then the "void" entry width, to expand the shape.
Use axlPolyExpand with the same value, but negative, to shink the shape again. The outline of the resultant polygon will now be what you want - although you will need to check what happens to corners.
Thanks for the quick response. The problem with poly expand is the corner of the shape is not ate same as before when you negate the expanded shape.