实现了鼠标交互的所有功能,包含对绘制的图形通过鼠标滚轮进行无极缩放以及任意拖动.-Mouse interaction achieved all the features included on the map graphics through mouse wheel to zoom Promise and arbitrary drag.

模仿AutoCAD鼠标滚轮功能用vb实现滚轮控制图像缩放。同时实现了二维图对象选择等功能。-AutoCAD Mouse Wheel function of imitation achieved using vb wheel control image scaling. While achieving a two-dimensional map objects selection and other functions.

总结： 该工程实现了CTRL+滚轮放大缩小的功能、拖拽功能。 心得： 世界变换时，坐标必须是固定的，ClientRect可能会因拖拽、缩放变化，这点很重要！非常重要。(This project has realized the function and drag function of the CTRL+ roller enlargement and reduction.)