Help for this page
Eg: $rect_x[0], $rect_y[0] are the coordinates of rectangle 1. $point_x[0], $point_y[0] are some point linked to rectangle 1
@rect_x = {3,2,4,0,3,0,4,0,3,2,0,4} @rect_y = {0,0,0,1,1,0,3,3,3,3,2,2} ... . Rectangle n-1 -> (0,2) Rectangle n -> (0,3)