To save me reinventing the wheel, has anybody written routines to act on mouseclicks inside irregularly-shaped "buttons"?
Techniques I'm considering: ++ Detecting if a point is inside an arbitrary polygon ++ Unions and differences of rectangles, triangles and sectors ++ Color of the pixel under the cursor If it works on a simple map of the USA, it'll probably work for my purpose. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
