Transform clip-rect using raphael

HTML

<div id='myid'>

</div>

JavaScript

r = Raphael('myid',600,400);
myimage = r.image('http://25.media.tumblr.com/032e7b64fbc53862cb4c53b6a564f216/tumblr_mnthd5m5y21sqq5odo3_1280.jpg',50,50,100,100)
myimage.attr({'clip-rect':[100,100,200,200]})
myrect  = r.rect(100,100,200,200).transform("r45")
myimage.clip.setAttribute("transform", myrect.node.getAttribute("transform"))