| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to display a differently scaled map in an arbitrary position on a displayed map by designating an arbitrary position on a displayed map, and displaying the differently scaled partial map corresponding to the designated position in the periphery of the designated position replacing the part being displayed. SOLUTION: A certain map is displayed on a main screen 1. When a menu is displayed in this state and 'loupe display' is selected, the display center coordinates P0 of the displayed map on the main screen 1 and the scale S0 of the map are taken out. The scale S1 of the loupe picture is calculated from S1=S0.R. R is a preset ratio of the scale of the main picture to that of the loupe picture. The loupe picture 2 in a circular mark is displayed centering the center coordinates P0 of the main picture 1. Next, the partial map of the calculated scale S1 is displayed in the loupe picture 2. Thus, this device makes it possible to display the partial map in a circular display mark (loupe mark) like a magnifier (magnifying glass).
|
