hi this is the calculation i used for something very similar. dynamic text
layed out round a circle (picture attached), although it doesn't take into
account re-registering it so it is top left registration:
function makeNames() { for (var i:int=0; i<filmNames.length; i++) {
filmHolders[i] = new MovieClip(); filmHolders[i].val = i;
namesHolder.addChild(filmHolders[i]); // var degs:Number
= i * 20; var rads:Number = (degs * Math.PI) / 180;
var r:Number = 110; var rx:Number = (r * Math.cos(rads));
var ry:Number = (r * Math.sin(rads)); // ...
filmHolders[i].x = rx; filmHolders[i].y = ry;
filmHolders[i].rotation = i * 20; // var
nameText:TextField = new TextField(); nameText.text =
filmNames[i];
filmHolders[i].addChild(nameText); // }}
surely if you put each sprite you want around the circle inside a container
sprite for each sprite then you can sort the registration out:
//container for "wheel" of spritesvar containAll:Sprite = new
Sprite();addChild(containAll);
containAll.x = stage.stageWidth/2;containAll.y = stage.stageHeight/2;
function makeSprites(num:Number) { //create your sprite and draw contents
var mySprite:Sprite = new Sprite(); mySprite.graphics.beginFill(0xff0033);
mySprite.graphics.drawRect(0,0,30,20); mySprite.graphics.endFill();
//create a container for the sprite var myContainer:Sprite = new Sprite();
containAll.addChild(myContainer); myContainer.addChild(mySprite);
//re-register inside container mySprite.x = -mySprite.width/2; mySprite.y =
-mySprite.height/2; //do calculations var degs:Number = num * 20;
var rads:Number = (degs * Math.PI) / 180; var r:Number = 110; var
rx:Number = (r * Math.cos(rads)); var ry:Number = (r * Math.sin(rads));
//apply calculations to container myContainer.x = rx; myContainer.y =
ry; myContainer.rotation = num * 20;}//run function a few timesfor(var
i:int = 0; i<16; i++) { makeSprites(i);}
(i've also not eaten so its probably wrong and i've completely misunderstood
what you're after!!!)
good luck,
david
> Subject: Re: [Flashcoders] Placing sprites on the circumference of a circle
> From: w...@innerfuse.biz
> Date: Mon, 9 Nov 2009 21:55:36 +0100
> To: flashcoders@chattyfig.figleaf.com
>
> After a bike ride down hill to the supermarket and cooking I just
> tried out all your suggestions and I have to say it appears to work!
> Really nice, only the problem I am currently happening is the issue
> when I am creating sprites dynamically during runtime the origin is
> not in the bottom center but in the top left which goofs up
> everything. And when I try to do:
>
> x = -( b.width / 2 );
> y = -( b.height );
>
> Before I am updating the positions as calculated the trigonometry
> formulas. I am quite sure I am overseeing something, though. Not sure
> what is wrong even when I do this after the setting x,y to the values
> of nx, ny it still fails for me.
>
> The current code I am using is as follows:
> http://www.innerfuse.biz/dropbox/code.txt
>
> Anyone know what I could be doing wrong? Thanks again, you guys are
> lifesavers :)
>
> (really need to get a book about mathematics again to fresh up)
>
> Yours,
> Weyert de Boer
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