| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable smooth scroll processing without consuming the memory capacity wastefully by drawing and processing a map information of a display range moved for every occurrence of a movement event in a first and a second image areas alternately. SOLUTION: In scroll processing, when a movement event occurs, a CPU 111 draws a map information corresponding to the screen display range after the movement due to a movement event in the other image area. In drawing and processing in one image area, concerning data corresponding to an overlap part of the screen display range before movement and the screen display range after movement, read processing from a storage part 112 and the drawing and processing are not conducted, but the map image to the screen display range before movement already drawn in the other image area is utilized. Thus, every time the movement event for moving the display range occurs, the map image of the display range moved corresponding to the movement event are drawn and processed in a first image area and a second image area alternately.</p> |
