Question

flash as3.0中用代码控制元件的运动，怎么使元件不超出舞台外面

function FoodPosition():void
{
food.x = int(Math.random() * rows) * 2 * radius + 2 * radius;
food.y = int(Math.random() * cols) * 2 * radius + 2 * radius;
if (food.x > 580 || food.y > 580 || food.x < 0 || food.y < 0)
{
food.visible = false;
}
}

当元件的坐标超出舞台时，让其可见性为false，这样写发现总是没有效果

Answer 1

你没把元件的宽度很高度算进去。。。
if(food.x+food.width/2>580||food.y+food.height/2>580........