| 摘要 |
<p>PURPOSE:To realize a high-speed and optional shift of screen, by deciding the area to be displayed in the relation of function from the position indicated by a light pen. CONSTITUTION:The display information to be given to a CRT display device 3 is stored in a storage device 2 in the form of a screen larger than a display device 5. When the position of display is indicated to the device 5 by a light pen 6, a calculation is carried out in the relation of function such as u1=u0+X0X-max/2, v1=v0+Y0-ymax/2, etc. to display a small screen centering on the indicated position. The indication of the light pen is repeated to change the display successively. The indication is also made possible with use of a cursor position. In such a way, a screen can be shifted to an optional position in a high speed.</p> |
