Re: [問題] 從中心向外擴散讀取bitmapdata點陣
我說的是像這樣的東西：
http://cgm.cs.ntust.edu.tw/etrex/iterator/iterator.html
原始檔：
http://cgm.cs.ntust.edu.tw/etrex/iterator/iterator.fla
========================= 程式碼 =========================
var i = 1;
this.addEventListener(Event.ENTER_FRAME,enterFrameHandler);
function enterFrameHandler(e:Event):void{
var x = FX(i) * 30 + 255;
var y = FY(i) * 30 + 180;
NumberText(i , x, y);
i++;
}
function NumberText(i:int,x:int,y:int)
{
var T = new TextField();
T.x = x;
T.y = y;
T.text = i;
this.addChild(T);
}
function FX(i:Number):Number{
var w = Math.sqrt(i-1);
w = (w + 1) / 2;
w = Math.floor(w);
var d = i - ((2*w - 1) * (2*w - 1) + 1) ;
if (d < 0) d = 0;
if( d < 2 * w)
return -w + d;
else if (d < 4 * w)
return w;
else if( d < 6 * w)
return 5 * w - d;
else
return -w;
}
function FY(i:Number):Number{
var w = Math.sqrt(i-1);
w = (w + 1) / 2;
w = Math.floor(w);
var d = i - ((2*w - 1) * (2*w - 1) + 1) ;
if (d < 0) d = 0;
if( d < 2 * w)
return -w;
else if (d < 4 * w)
return -3 * w + d;
else if( d < 6 * w)
return w;
else
return 7*w - d;
}
--
blog:http://etrex.blogspot.com/
--
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