Flash AS3 學習8 - 旋轉的小球

1.在舞臺新建一個元件ball；用橢圓工具畫一個圓。

2.代碼：

this.addEventListener(Event.ENTER_FRAME , onEnterframe);

var shift:Number = 0;
var startX = 200;
var startY = 200;
var r = 60;

graphics.lineStyle(0);
graphics.moveTo(startX + r , startY);

function onEnterframe(evt: Event)
{
 graphics.lineTo(startX + r * Math.cos(shift),startY + r * Math.sin(shift));
 ball.x = startX + r * Math.cos(shift);
 ball.y = startY + r * Math.sin(shift);
 shift +=  15;
}

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