A bezier curve would be one way to go about it. Flash's curveTo method uses a quadtratic curve though, so using a cubic curve won't give you an accurate curve.
If you know that the two endpoints of the curve are always going to have an equal x or y value, the you can just use the quadratic formula, and get the right Y value. If the endpoints are arbitrary, it's a bit more complicated. Bezier curves take a number from 0 to 1 and give you a point along the curve. Plugging 0 into the formula gives you the first endpoint, 1 gets you the last, and anything else gives you something in between. This means you're going to have to figure out where along the curve your MC is closest to, which involves some vector math. If you want, I can draw out the way I'd approach it. --- leolea <[EMAIL PROTECTED]> wrote: > > Hi, thanks for your reply! > > My curve isn't exactly a circle. Here's what my > animated curve would look > like: > http://pages.videotron.com/poubou/flash/cannes01.html > > > The curve is drawn using the drawing API: > example: > mc.moveTo(0,0); > mc.curveTo(400,900,0,800); > > So, I know the 3 bezier points that define my curve: > startpoint = 0,0 > middlepoint = 400,900 > endpoint = 800,0 > > With those values in hand, how can I apply them to > your function: > > f(x) = A*x + x^2 > > > Do I make any sense? > > > > > On 4/25/07 3:50 PM, "Jobe Makar" > <[EMAIL PROTECTED]> wrote: > > > Hi, > > > > Your typical funciton looks something like this in > math books: > > > > f(x) = A*x + x^2 //just an example > > > > Where f(x) is essentially 'y'. So, you just need > the equation that defines > > your curve. The curve in your jpg appears to be a > circle. > > > > y = sqrt(x^2 + r^2) //where r is the radius > > > > That actually yields + or - and you just pick what > fits your situation best. > > So, you pump in an x and get you 2 y's. Pick the > best y and use it. > > > _______________________________________________ > Flashcoders@chattyfig.figleaf.com > 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 > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Flashcoders@chattyfig.figleaf.com 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
