This should do it :
public function getPositionOnCurve(p1:Point, p2:Point, p3:Point,
t:Number):Point {
var pos:Point = new Point();
pos.x = Math.pow((1-t),
2)*p1.x+2*t*(1-t)*p2.x+Math.pow(t, 2)*p3.x;
pos.y = Math.pow((1-t),
2)*p1.y+2*t*(1-t)*p2.y+Math.pow(t, 2)*p3.y;
return pos;
}
P1 is the start point of the curve (moveTo(p1.x, p1.y))
P2 the control point
P3 the end point (curveTo(p2.x, p2.y, p3.x, p3.y))
T is a number between 0 and 1, .5 for halfway
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of eric e. dolecki
Sent: 09 August 2007 17:19
To: Flashcoders mailing list
Subject: [Flashcoders] Finding a spot on a curveTo Line
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
- eric
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