I see a link into the place where they got the physics right in the project description:
http://www.ffiles.com/flash/physics_and_motion/drag_and_rotation_with_easing_1649.html Have you tried registering and downloading - maybe it contains source? --jonathan On Thu, Jul 3, 2008 at 6:32 AM, Leandro Ferreira <[EMAIL PROTECTED]> wrote: > Sure, drag and throw is not a problem, nor is rotation based on an > arbitrary > point, but deciding how an object should rotate based on where the user > pressed and how he dragged it. But thanks anyway. > > About ready-made classes: with APE or box2D I could manage to recreate > this, > but that's not the point: what I want is to understand how it's done. > Anyone? > > > Leandro Ferreira > > On Thu, Jul 3, 2008 at 1:19 AM, Ashim D'Silva <[EMAIL PROTECTED]> > wrote: > > > Basically it's using velocity well. The dragging and throwing is > > pretty easy to figure out with basic physics (velocity and > > decay/friction). The rotation is a little trickier I imagine using > > some sort of Matrix transformations to dynamically decide a point to > > rotate around. Look for rotations around an arbitratrary point. I > > don't have enough knowledge to actually help you out directly but > > hopefully this will lead you in some direction. > > > > Maybe there are some ready made classes... > > > > Ashim > > > > -- > > Random Lines 3D > > My online portfolio > > www.therandomlines.com > > > > 2008/7/3 Leandro Ferreira <[EMAIL PROTECTED]>: > > > Hi there, > > > > > > I was trying to understand how this( > > > > http://www.ffiles.com/flash/templates/drag_and_rotate_website_1670.html) > > > kind of movement works, but I have no idea on what to search for. > > > At first I got an physics book about classical mechanics, but didn't > find > > it > > > useful, and can't find the exact theories involved in order to look for > > and > > > applied use. > > > Then I began working 'intuitively' in it, with some trigonometics and > so, > > > but things got ugly and now I'm kind of stuck. > > > > > > Does anyone here know where can I find some > information/article/readable > > > source about this? > > > > > > > > > > > > Thanks, > > > Leandro Ferreira > > > _______________________________________________ > > > Flashcoders mailing list > > > Flashcoders@chattyfig.figleaf.com > > > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > > > > > > > > > > -- > > Random Lines 3D > > My online portfolio > > www.therandomlines.com > > _______________________________________________ > > Flashcoders mailing list > > Flashcoders@chattyfig.figleaf.com > > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > > _______________________________________________ > Flashcoders mailing list > Flashcoders@chattyfig.figleaf.com > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > -- -jonathan howe :: 404.434.2321 :: 180 High St Apt 26 Portland, ME 04101 _______________________________________________ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
