Determines whether the two points given are 'either side of the object' if true then the two positions are not visible to each other. @param x0 first point x position @param y0 first point y position @param x1 second point x position @param y1 second point y position @return true if the points are o
(double x0, double y0, double x1, double y1)
source not stored for this graph (policy: none)