| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a screen changing method which enables taking out object images by changing screens with respect to large-scale image data, such as circuit diagram and water service pipe arrangement and to easily perform screen operations. SOLUTION: In a screen display information buffer 1, display ranges and display moded or the like at the time of displaying one part of a drawing on a screen are stored, and a screen information storing (push) command 2 makes information to be fetched in the buffer and a screen information calling (pop) command 3 takes out information stored in the buffer to the screen. A screen displayed at present is stored in the screen display information buffer into a stack format by the storage command at every branch point of the drawing used in inputting or editing drawing elements connected network-like and when an operation returns to the branch point, the screen of the uppermost buffer of the screen display information buffer is called by the calling command.</p> |
