WPF 鼠标拖拽功能，自定义拖拽的跟随图形，不再是一个虚线的系统的小标志，而是具体所拖拽的对象的图形，比如拖一个button，后面跟随的就是一个button的形状。-WPF mouse drag and drop, drag the following custom graphics, broken system is no longer a small sign, but concrete by dragging a graphical object, such as dragging a b

基于WPF的GIS地图浏览程序，其功能主要是浏览某一地区的地图，支持地图缩放，拖动-WPF-based GIS map browsing program, and its main function is to browse the map of a region, support map zoom, drag