一个简单的图形图像实例用opengl 橡皮筋画直线，-A simple example of a graphical image with a rubber band opengl draw a straight line,

程序运行后生成500×500的窗口，可在窗口中实现橡皮筋功能的直线绘制，并实现矩形选框剪裁功能。左键键拖动绘制直线，按下右键可实现橡皮筋的拖拽，中键可以拖动绘制矩形选框，配合键盘上C键可以实现对直线的剪裁。-Generated after the program runs 500 × 500 window, can be achieved in the window rubber band drawing a straight line features, and to achieve tail

This a paint application in vc++.It has been coded from scrap.Rubber band method has been implemented.User can open,draw and save an image of any extension.-This is a paint application in vc++.It has been coded from scrap.Rubber band method has been

打开一个线文件和保存改变过的线文件，编辑线的属性和参数（调用mapgis函数）； 用橡皮筋的形式输入线，可以用F3撤销F4恢复-Open a line file and save the changed line files, edit the line attributes and parameters (call mapgis function) the form of input line with a rubber band, you can use F3 F4 withdrawa