Sorry, wasn't aware that you were looking for a real ellipse, I thought
something nicely ovalish, kind-of-roundish would do :-)
You'll find a bit more on CatmullRom here:
http://www.mvps.org/directx/articles/catmull/
hth
--------------
Andreas Weber
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Matthias
Dittgen
Sent: Freitag, 6. Oktober 2006 13:10
To: Flashcoders mailing list
Subject: Re: [Flashcoders] geometry // oval around text
Hello Andreas,
your CatmullRomSpline is really impressive, but it draws not a real ellipse.
If it would, this code should produce a circle, right? var points:Array =
new Array(
{x: 0, y: 0},
{x: 0, y: 50},
{x:50, y: 50},
{x:50, y: 0},
{x: 0, y: 0});
var spline:CatmullRomSpline = new CatmullRomSpline(points);
var approxLineLength:Number = 3;
spline.plotAll(mc, approxLineLength);
How is the bend of the curve defined?
Matthias
2006/10/5, Andreas Weber <[EMAIL PROTECTED]>:
> Instead of re-inventing the wheel (which can be a lot of fun!) you
> might find it easier to use an already existing Spline class, e.g. my
> CatmullRom
> Spline:
>
> http://www.motiondraw.com/md/as_samples/t/CatmullRomSpline/closedShape
> .html
>
> The advantage is that you can just pass in the corner points of the
> textfield (or, if you want some 'padding', it's easy to calculate the
> corners of the outer rectangle) - the spline will automatically curve
> through these points.
>
>
> If you are interested in the Math of Splines, don't miss the in-depth
> tutorials by Jim Armstrong: http://www.2112fx.com/
>
> hth
> --------------
> Andreas Weber
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of
> Matthias Dittgen
> Sent: Donnerstag, 5. Oktober 2006 09:41
> To: Flashcoders mailing list
> Subject: [Flashcoders] geometry // oval around text
>
>
> Hello,
>
> I need a tipp for drawing an oval around a dynamic textfield with
> variable line numbers and variable width? Perhaps, someone can point
> me to a good tutorial dealing with such geometry questions. The
> drawOval methods I am using have width and height as parameters, but
> of course I can't use width and height of the textfield without a
> padding. How can I calculate an i appropriate padding?
> The drawOval methods:
>
> public function drawOval_Old(x:Number, y:Number, width:Number,
> height:Number):Void {
> movieClip.lineStyle(lw, lc, la);
> movieClip.moveTo(x,y+height/2);
> movieClip.curveTo(x,y,x+width/2, y);
> movieClip.curveTo(x+width,y,x+width, y+height/2);
> movieClip.curveTo(x+width,y+height, x+width/2, y+height);
> movieClip.curveTo(x,y+height, x, y+height/2);
> }
>
> public function drawOval(x:Number, y:Number, width:Number,
> height:Number):Void {
> x+=width/2;
> y+=height/2;
> width/=2;
> height/=2;
> var j:Number = width * 0.70711;
> var n:Number = height * 0.70711;
> var i:Number = j - (height - n) * width/height;
> var m:Number = n - (width - j) * height/width;
> movieClip.lineStyle(lw, lc, la);
> movieClip.moveTo(x+width, y);
> movieClip.curveTo(x+width, y-m, x+j, y-n);
> movieClip.curveTo(x+i, y-height, x, y-height);
> movieClip.curveTo(x-i, y-height, x-j, y-n);
> movieClip.curveTo(x-width, y-m, x-width, y);
> movieClip.curveTo(x-width, y+m, x-j, y+n);
> movieClip.curveTo(x-i, y+height, x, y+height);
> movieClip.curveTo(x+i, y+height, x+j, y+n);
> movieClip.curveTo(x+width, y+m, x+width, y);
> }
>
> Thanks,
> Matthias
>
>
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