| 摘要 |
<p>PURPOSE:To secure the always same high speed display speed regardless of plotting data size in the case of scrolling plotting data having general view size larger than the CRT tube surface by means of a software in order to monitor a large size equipment system. CONSTITUTION:A general view of plotting data is assumed as a virtual image plane, and its virtual image plane is divided into uniform blocks. Next, the number (1)-(9) is given to the respective blocks. Here, assuming that a display area on a CRT is an area surrounded by dotted lines, the block numbers (2), (3), (5) and (6) to which its display area belongs are referred. After checking whether or not coordinates of display objects contained in the referred blocks (2), (3), (5) and (6) exist in the dotted lines, only the display objects existing in the dotted lines are outputted on the CRT.</p> |
