> Michael K. wrote: > Pointlist to Bezier > Hi there > I wonder if any have code to take a point-list and turn it > into a smooth-lined bezier.
A bezier curve is a mathematical model. It can only approximately be drawn by polygons. LC's path method is as good as others, has only (because it's not a drawing app) no enhanced antialiasing algorithms attached which emulate "dividing" pixels or 'atomic' printer points, tricking our eyes. That is, one uses bezier curves to approximate 'theoretically' a list of user-points and then use polygons (here: deCasteljau's algorithm) to approximate the bezier curves. The main starting problem for smoothing lists of 'user-points' by any approximating curve model is to decide = what is a badly drawn straight line = what is a curved piece Now look at the HTML5 demo "(Smooth-)Draw" http://hyperhh.org/html5/krikelKrakel-8.0.0-dp-9X.html Check "Show Markers" and "Smoothing" and see if it's doing what you think of. If you download the stack you can have a (close to) "live" smoothing, the HTML5 javascript slows down by a factor of > 10. The script is a (mathematically) rather simple approach, but suffices for a demo. The algorithm used there is deCasteljau's, approximating quadratic bezier curves with control points taken from user's input. I use there also a well-known decision rule to differentiate between curved and non-curved parts. There is possibly already an app that is based on this approach and has an improved handling/rescaling of the smoothed points and a better collecting points algorithm. (The original idea had 'Mag' some time ago in the LC-forum, I put only imperfectly, in a few hours, the "smoothing" onto that. May be he finished meanwhile his project). HTH, Hermann _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
