简单的绘图程序,能画点,直线,多边形等,比较简单,希望有人认同-simple drawing program, can draw points, lines, polygons, etc., relatively simple, hoping that someone will recognize

实现MIF标准文件读取，识别判断显示线条，点选线条，高亮显示-Realization of MIF file to read, recognize the display lines, click the line, highlighting