| 摘要 |
<p>PURPOSE:To executing zoom roaming for the partial area of a display content at high speed, to reduce a data transferring time and to shorten a processing time by freely setting a required display position in a second memory for display, to enlarge and to store a partial area in a first memory for display by the designation of a display starting point. CONSTITUTION:A certain window prepares a mask in an area corresponding to the zoom designating window area of a memory for window 4 at a timing zoom-designated and copies the data of the zoom designating window of a first memory for display 2a to a second memory for display 2b at the same time. Next, the data of the zoom designating window of the second memory for display 2b are enlarged by using its upper left as an origin while using the enlarging mechanism of hardware. When a part which is made invisible by a zoom is required to be displayed, roaming can be executed by changing the display starting point of the second memory for display 2b by an indication from the input device of a tablet and the like and displaying the data of the first memory for display 2a and the second memory for display 2b on a display scope 1.</p> |
