Patent ID: 6163749
Filing Date: 2000-12-19
Classification: G01C,G09B,G09G

Abstract:
A map display program for use in a navigation system having a graphics platform and a map database, the map display program adapted to retrieve and render map data from the map database to a display in response to instructions from a navigation application, the map display program comprising:a map processing layer comprising a scrolling function for providing movement of rendered map data across the display, the map processing layer responsive to the navigation application and in communication with a graphics interface layer, the map processing layer having a multi-tasking abstraction layer defining multi-tasking function requirements;the graphics interface layer having at least one lookup table, the at least one lookup table comprising drawing attribute information, the graphics interface layer responsive to instructions from the map processing layer; anda primitive layer in communication with the graphics interface layer and the graphics platform, the primitive layer populating the at least one lookup table in the graphics interface layer with platform specific data types from the graphics platform, wherein the map processing layer is independent of the graphics platform.