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
_______________________________________________
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
