| 摘要 |
<p>PURPOSE:To prevent the flicker in redisplaying the part where plural menues being displayed and the display mask are overlapped when a display menu is deleted by extracting parts where the menu area to be deleted and all the remaining menu area not overlapped and deleting the only extracted rectangular area. CONSTITUTION:A menu information table 2 corresponding to the menu to be deleted is taken out from a menu information management table 20. After changing a pointer 3 of the remaining menu, the rectangular area directed by the taken menu information table 2 is compared with one menu area of the menu information area of the table 2 remaining in the table 20 to extract areas not overlapped and a rectangular list is made by dividing the extracted areas into plural rectangular areas. By repeating the processing, the menu to be deleted and the area which is not overlapped with any of the menu to be displayed remaining in the table 20 are extracted and the only extracted area is cleared.</p> |
