as3isolib starling port
（IsoDrawingUtil not available)
used by
CSI-Miami-ios: http://ios.appsgoer.com/ubisoft-launches-csi-miami-heat-wave-for-iphone-and-ipad-5041.html
CSI-Miami-ios-CN(中文版): https://itunes.apple.com/cn/app/fan-zui-xian-chang-diao-cha/id640035956?mt=8