On 10/22/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Ok
i'm sure this is elementary for any math whizzes out there, but this is my
problem:
Given an initial point x1,y1 on the cicumference of a circle, how do we
determine point 2(x2,t2) and point 3 (x3,y3) if point 2 and 3 are 120 and 240
degrees respectively removed from point 1. ie all 3 points are 120 degrees
apart.
If the center of the circle is at (0, 0), then you can just rotate
point p1 by 120 and 240 degrees respectively, to get p2 and p3:
var angle = 120 / (180 * Math.PI); // ...or 240 instead of 120
var sin = Math.sin( angle );
var cos = Math.cos( angle );
x2 = cos * x1 - sin * y1;
y2 = sin * x1 + cos * y1;
HTH,
Mark
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