实现一个绘图的功能，可以输出点中的图形，实现画图-A drawing function, you can output point in the graphics, drawing realization

MyDraw.rar基本功能：菜单栏有绘图按钮，点击后可以选择点、线、椭圆、矩形。然后便可以画出相应的图形。-The basic function of MyDraw.rar: the menu bar drawing button, click can select the point, line, rectangle, ellipse. Then we can draw the corresponding graphics.

实现单点定位功能，读取N文件和O文件，定位精度达到10m-Single-point positioning function, file reading N and O files, positioning accuracy 10m