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Wow type FILL

translated to English. Good morning, try to make a routine that calculates the boundaries of an irregular polygon with the VLax-curve function. The problem happens that the program calculates the boundaries. the program works by selecting the polygon, second by selecting the blocks that identify the points in this order northwest, northeast, southeast, southwest. and calculate the distance north, south, east, west. the problem happens when I need to calculate the distance when it passes the origin point or ends at the origin point. below I show the images how the lisp is made and how it should look, I attach the file and the lisp that tries to program something else if they could check it if the file is simplified or a better method is used.