circle, counter-clockwise 2004-03-15 - By Andreas Weber
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More a geometry problem...
The following getCircleDat function returns the points and control-points to
draw a circle.
What I would like to do is to rewrite it so that it is possible to draw the
circle counter-clockwise.
I added the drawing function and the interval to show why it makes a
difference wether it's cw or ccw.
Thanks in advance!
-- ---- ------
Andreas Weber
motiondraw.com
// paste and run
radius = 100;
segments = 12;
c = getCircleDat(segments, radius);
count = 0 ;
intID = setInterval(drawCircle,500,this,c,radius);
drawCircle(this, c, radius);
function getCircleDat(segments, radius){
d = [];
var sgm = segments;
var periode = 2*Math.PI;
var sgmAngle = periode/sgm;
var cRangle = sgmAngle/2;
var cRx = radius/Math.cos(cRangle);
var cRy = radius/Math.cos(cRangle);
for (var angle = sgmAngle; angle<=periode+1; angle += sgmAngle) {
c = {};
c._cx = Math.cos(angle-cRangle)*cRx;
c._cy = Math.sin(angle-cRangle)*cRy;
c._x = Math.cos(angle)*radius;
c._y = Math.sin(angle)*radius;
d.push(c);
}
return d;
}
function drawCircle(mc, data, radius){
if(count == 0){
mc.lineStyle(2, 0xFF0000, 100);
mc.moveTo(radius, 0);
}
if(count < data.length){
mc.curveTo(data[count]._cx, data[count]._cy, data[count]._x,
data[count]._y);
}else{
clearInterval(intID);
}
count++;
}
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