flex里有什么办法能让mx:image在缩放后自动居中

[HOOLOO]

有没有什么办法让image在载入后缩放到适合大小，然后还能自动在容器内居中。

谢谢

[czx33859066]

//计算图片框的大小
public function caculate_size():void
{
_x = 0;
_y = 0;
_width = 0;
_height = 0;

//原始图片的大小
var real_width:Number = _image.contentWidth;
var real_height:Number = _image.contentHeight;

//容器的大小
var width:Number = this.width;
var height:Number = this.height;

//计算图片长宽与容器长宽的比值，缩放时按照大的缩放
var w_percent:Number = real_width/width;
var h_percent:Number = real_height/height;

if (w_percent < 1 && h_percent < 1 && !AutoZoomIn )
{
//当真实图片比容器小时，而且自动方法属性没有被设置时，则只是居中
_width = real_width;
_height = real_height;
_x = (width - _width)/2;
_y = (height - _height)/2;
}
else
{
//实际图片的长宽只要有一个比容器大，则按比例缩小
if (w_percent > h_percent)
{
_width = this.width;
_height = real_height / w_percent;
_x = 0;
_y = (height - _height) / 2;
}
else
{
_height = this.height;
_width = real_width / h_percent;
_y = 0;
_x = (width - _width) /2;
}
}
}

[HOOLOO]

这个方法试过了，不行。