Flash/AIR are vector display list renderers. If you give it tons of vectors to display, it will take a while to render them. This is quite different from bitmap renderers like Windows. There are advantages and disadvantages to each.
If I were writing such an app, I would probably take a snapshot every once in a while and draw on top of the recent snapshot. ________________________________ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of dannyvenier Sent: Thursday, March 27, 2008 7:19 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] graphics object seems to degrade performance Hi, I'm writing an AIR app that uses a scribble type component. In a nutshell, just uses the graphics lineTo() method to draw a line from the current location to the new position of the mouse on a mouse move event. I have noticed that after scribbling for a bit (maybe 30 seconds), the mouse movement tracking is impaired and my scribbling which once resembled smooth circles, starts to look like octagons, hexagons, pentagons...eventually triangles....you get the picture. The frequency which the application picks up the move events is reduced so the smooth tracking turns to noticable lines. The graphics object appears to be bogging down the application and mouse event frequency as the number of lines in the graphics object increases. It doesn't take long to degrade. I tried out the flex profiler and didn't show any significant growth in memory over this scribble period. I tried a scrible application from Andy Rayne's scribble board http://weblogs.macromedia.com/arayne/ <http://weblogs.macromedia.com/arayne/> and it behaves exactly the same way. There is no scaling, zooming or manipulation of the graphics lines at all. I'm assuming they're just pushing points onto an array but haven't looked into the source to confirm how this type of class behaves. Has anyone experienced this kind of degradation with a graphics object and if so, have you figured out what's going on?
