Well yeah. If you're doing a verlet integration-style thing where all you store about a particle is it's last position, and it's current position, and you're not using a constant time step, you have to do that. Storing the last 5 updates is a seperate thing.
This is just to overcome the difference in time between the interval firing and the mouse moving. If the mouse is updated every 10 milliseconds, and your interval fires every 7, you're going to get intervals where the mouse position hasn't changed. The solutions, really, are to slow down your interval, or just average things. --- Ron Wheeler <[EMAIL PROTECTED]> wrote: > Would you not eliminate the whole problem by keeping > track of the time > that the previous position was taken along with its > coordinates and use > that to calculate the time between the readings and > divide that into the > distance? > Then you do not care if the set interval or on enter > frame come at > equally spaced intervals. > > Ron > > Joshua Sera wrote: > > It's indeed a setInterval problem, as the interval > and > > mouse movement won't necessarily match up. > > > > onMouseMove can also be a problem, as you'll wind > up > > with a lot of readings going straight > > up/down/right/left, rather than in the direction > > you're moving. > > > > What I've done for this problem is to average the > > mouse movement over 5 or so updates to get a more > > accurate reading. Demo here: > > > > http://www.yourmomsa.com/springexp/springexp2.swf > > > > Pick the guy up by the wheel to toss him. > > > > > > --- "eric e. dolecki" <[EMAIL PROTECTED]> wrote: > > > > > >> I am calculating mouse velocity, but every now > and > >> then you get a 0 for > >> velocity eventhough its not 0 (setInterval prob I > >> suspect). Any better > >> approach? > >> > >> var MouseX; > >> var MouseY; > >> > >> function determineVelocity():Void > >> { > >> MouseX = _root._xmouse > >> MouseY = _root._ymouse > >> setTimeout( calc, 9 ); > >> }; > >> > >> setInterval( determineVelocity, 20 ); > >> > >> function calc():Void > >> { > >> var newMouseX:Number = _root._xmouse; > >> var newMouseY:Number = _root._ymouse; > >> > >> var deltaX = Math.abs(MouseX - newMouseX) > >> deltaY = Math.abs(MouseY - newMouseY) > >> dist = Math.sqrt((deltaX * deltaX) + (deltaY > * > >> deltaY)) > >> velocity = dist*31; // 31 = fps > >> trace( velocity ); > >> }; > >> _______________________________________________ > >> [email protected] > >> To change your subscription options or search the > >> archive: > >> > >> > > > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > > >> Brought to you by Fig Leaf Software > >> Premier Authorized Adobe Consulting and Training > >> http://www.figleaf.com > >> http://training.figleaf.com > >> > >> > > > > > > > > > > > ____________________________________________________________________________________ > > Sick sense of humor? Visit Yahoo! TV's > > Comedy with an Edge to see what's on, when. > > http://tv.yahoo.com/collections/222 > > _______________________________________________ > > [email protected] > > To change your subscription options or search the > archive: > > > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > > > Brought to you by Fig Leaf Software > > Premier Authorized Adobe Consulting and Training > > http://www.figleaf.com > > http://training.figleaf.com > > > > > > > _______________________________________________ > [email protected] > To change your subscription options or search the > archive: > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > Brought to you by Fig Leaf Software > Premier Authorized Adobe Consulting and Training > http://www.figleaf.com > http://training.figleaf.com > ____________________________________________________________________________________ Get the free Yahoo! toolbar and rest assured with the added security of spyware protection. http://new.toolbar.yahoo.com/toolbar/features/norton/index.php _______________________________________________ [email protected] To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
