图像居中旋转

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Canvas id="imgWrapper" width="0" height="0" verticalCenter="0" horizontalCenter="0" clipContent="false">
        <mx:Image id="img" verticalCenter="0" horizontalCenter="0" opaqueBackground="#000000"
                smoothBitmapContent="true" scaleContent="false"
                source="http://www.adobe.com/products/flex/images/flex_157x155.png" />
    </mx:Canvas>
    <mx:Button label="CW" buttonDown="imgWrapper.rotation += 5;" autoRepeat="true"/>
    <mx:Button label="CCW" left="60" buttonDown="imgWrapper.rotation -= 5;" autoRepeat="true"/>
</mx:Application>