| 摘要 |
PURPOSE:To shorten the time required for calculating process and display operation by storing graphic data which are clipped in an invisible area and displaying a graph by using the stored data when a visible area changes. CONSTITUTION:A program 27 sends a display request to a window control program 26. The window control program 26 informs the program 27 of the visible area 25 and invisible area 24. The program 27 sends the data, obtained by clipping graphic data in the visible area 25, to the window control program 26 to display the figure in a window 22 and also stores a memory 29 with the result obtained by clipping the graphic data in the invisible area 24 at the same time. When the invisible area of the window 22 is eliminated, the window control program 26 informs the program 27 of that. The program 27 does not clip only the graphic data stored in the memory 29 and sends them to the window control program 26 to display the figure in the previous invisible area 24. |
