| 摘要 |
<p>A map display device 200 stores a map image dataset 211 with image pixels including a plurality of static-type pixels 410 each having only one color value 412, and a plurality of dynamic-type pixels 420 each having a predefined set of color values 422-426, and a function definition field 428 which defines a function to select between said color values 422-426. A graphics processor 220 processes one tile 401 of map image data by, for each of the dynamic type pixels 420, retrieving the function identified by the function definition field 428, applying a current time value to the function, and selecting one of the predefined set of color values 422-426 according to a result of the function. An output unit 230 outputs the map image frame as a raster image containing one pixel color value at each of the pixels for display on a display screen 240.</p> |
