Douglas-Peucker function

This function uses douglas-peucker algorithm to simplify the shape of the polygons

This algorithm chooses few points from the list of points on the boundary and computes the points that are beyond the tolerance value. it also provides the indices of the points

syntax [list_pts,pnts]= douglas_peucker(point_list, tolerance);

this function uses some other functions that are downloaded from matleb central(such as push and pop), also another function named "normal_dist" that is used to find shortest distance of a point(P) from a line passing through two known points(P1,P2).