This applet demonstrates:1、receiving multiple files from a drag-drop operation 2、being a drag-drop source 3、optimizing the viewer for performance--creating thumbnails on the fly and owner draw issues 4、usability issues--changing image and form sizes

图片加载并，旋转显示，鼠标滚动图片可放大和放大后可拖动图片。-Image loading, rotating display, zoom and drag