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 > > > _______________________________________________ > Flashcoders@chattyfig.figleaf.com > To change your subscription options or search the archive: > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > Brought to you by Fig Leaf Software > Premier Authorized Adobe Consulting and Training > http://www.figleaf.com http://training.figleaf.com > _______________________________________________ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com _______________________________________________ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
