Thanks Fumio - I already had an 8-segment circle-drawing function, I was
looking for a 4-segment. It turned out to be pretty trivial - not accurate,
but close enough for what I needed. So my problem is solved.
Thanks anyway!
Cheers,
Ian
On 2/3/06, Fumio Nonaka <[EMAIL PROTECTED]> wrote:
>
> function xDrawCircle(target_mc:MovieClip, nX:Number, nY:Number,
> nR:Number, nSegments:Number):Void {
> if (nSegments == undefined) {
> nSegments = 8;
> }
> var nAngle:Number = 2*Math.PI/nSegments;
> target_mc.moveTo(nX+nR, nY);
> for (var i = 1; i<=nSegments; ++i) {
> var nTheta:Number = i*nAngle;
> var nAnchorX:Number = nR*Math.cos(nTheta);
> var nAnchorY:Number = nR*Math.sin(nTheta);
> var nControlX:Number =
> nAnchorX+nR*Math.tan(nAngle/2)*Math.cos(nTheta-Math.PI/2);
> var nControlY:Number =
> nAnchorY+nR*Math.tan(nAngle/2)*Math.sin(nTheta-Math.PI/2);
> target_mc.curveTo(nControlX+nX, nControlY+nY, nAnchorX+nX,
> nAnchorY+nY);
> }
> }
> // Test
> var _mc:MovieClip = this.createEmptyMovieClip("target_mc", 1);
> _mc.beginFill(0x00FFFF);
> _mc.lineStyle(2, 0x0000FF);
> xDrawCircle(_mc, Stage.width/2, Stage.height/2, 100, 8);
> _mc.endFill();
> _____
> Ian Thomas wrote:
> > Thanks for that - I've come up with an approximation based on very
> similar
> > code. Not ideal, but it's close enough for the purpose I needed it for.
> That
> > combined with a quick hash table to make sure I'm not plotting circles
> near
> > other circles has given me the performance I need.
>
> Good luck,
>
> Fumio Nonaka
> mailto:[EMAIL PROTECTED]
> http://www.FumioNonaka.com/
> My books<http://www.FumioNonaka.com/Books/index.html>
> Flash community<http://F-site.org/>
>
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