Also make sure you are calling graphics.clear() before re-drawing all of your graphic commands.
________________________________ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Eric Cooper Sent: Monday, April 14, 2008 9:23 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] Re: graphics object seems to degrade performance I am experiencing performance issues similar to those described in this thread. By way of background, I am working on a geometry tool that allows the user to create points, line segments, circles and polygons, to move then about and to create constraints between them. I am new to ActionScript/Flex/Flash and, perhaps, tainted by other languages/frameworks. So, I have subclasses Canvas and it is responsible of rendering all the geometric shapes. In other words, my geometric shapes do extend DisplayObject and are *not* in the display list. As I add more and more shapes (i.e., more than 10), I see that drag performance degrades rapidly. I am considering adopting Alex's suggestion: generating a bitmap at the start of a drag (such that the bitmap contains all shapes that are not about to be dragged), clearing the graphics object, blitting the bitmap and then drawing the object(s) being dragged. I am wondering, though, if I would get this for "free" if I used DisplayObject and the built- in drag events. I am also wondering, if I am saving that much in terms of memory and speed, by "rolling my own" as it were. Thanks, -Eric --- In flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com> , "Alex Harui" <[EMAIL PROTECTED]> wrote: > > It will help some, but you'll still end up with 500,000 vectors spread > thorough 1000 overlaid shapes. > > > > In order to handle undo, you would track the vectors in your own array > of points and take snapshots as I suggested. I wouldn't even encode as > png, all you need is one extra bitmapdata.
