Thanks, Troy. I am using alpha currently, and think that I will be able to use various matrix manipulations when I get there. I am drawing to a Canvas. I think that I will be exploring bitmap caching shortly. But if it starts looking like I will need to manage my own dirty rectangles then I will spend some time extending DisplayObject. -Eric
--- In flexcoders@yahoogroups.com, "Troy Gilbert" <[EMAIL PROTECTED]> wrote: > > > 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. > > If you make each draggable item (each shape) its own DisplayObject > then yes, you'll get some optimizations for free, such as bitmap > caching. You'll also get the benefit of the fact that the drawing > "loop" is at least written in native code (the display list), and may > even have some additional optimizations helping you depending on your > specific dataset (dirty rectangle lists, etc.). > > Finally, by making each object a DisplayObject instead of managing the > shapes yourself, you get a huge amount of "features" for free, such as > alpha, filters, sort order, scaling, rotation... all those nice, > native things DisplayObjects do. > > Troy. >
