How to eliminate the flying spot by using the MAPGIS code files in the graphics

According to the problems that the flying spot caused by the various reasons causes that the graphics can not be displayed in the full screen, that no graphic is in the windows range,that the graphics can not be outputted when the complex images are processed by using the MAPCAD,the author introduces the concrete operation of eliminating the flying spot by using the MAPGIS code files,to expect that MAPGIS software can serve people.