This function extends a polygon by a specified range. It also generates internal polygons caused by intersections.
The resulting polygon does not preserve the original shape of the input polygon (see screenshot above), but represents the range specified from the input polygon.
Example of usage is given in the m-file header (or type "help extendPoly").
Credit to NS for the self intersection algorithm.
Krispijn Scholte (2021). Accurate polygon extension (https://www.mathworks.com/matlabcentral/fileexchange/21925-accurate-polygon-extension), MATLAB Central File Exchange. Retrieved .
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