you guys rock - i'll implement this soon™ and report back.
doesn't matter which way the curve is i imagine (convex/concave)
On 8/9/07, Zeh Fernando <[EMAIL PROTECTED]> wrote:
>
> > Quick question...
> > I have a curveTo between points, but I'd like to get the x,y 1/2 way
> through
> > the curve, ON the curve. Googling for some code but haven't seen it
> yet...
> > I basically want to join another line to the midpoint of the curve, and
> the
> > curve is dynamically moving throughout
>
> A quick way is to use Penner's pointOnCurve...
>
> findPointOnCurve = function (p1x, p1y, cx, cy, p2x, p2y, t) {
> return {x:p1x + t*(2*(1-t)*(cx-p1x) + t*(p2x - p1x)),
> y:p1y + t*(2*(1-t)*(cy-p1y) + t*(p2y - p1y))};
> };
>
> t is 0-1.
>
> It will give you some distortion on the position over the curve
> depending on the angle, and desired position. If you use just halfway
> (0.5) it'll work perfectly though.
>
> Same calculation and more information:
>
> http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Quadratic_B.C3.A9zier_curves
>
> Zeh
> _______________________________________________
> [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
