THREE-DIMENSIONAL MAP DISPLAY DEVICE

摘要

A three-dimensional map effectively uses a space of the sky or the background to display character strings. A transmitter/receiver obtains map data used to display each feature three-dimensionally and character data representing a character string to be displayed in the three-dimensional map from a map database. A feature image generator generates a feature image in which each feature is drawn three-dimensionally. A character display controller controls display of the character string on the feature image. The character display controller changes over at least one of a display direction and a number of display lines of the character string with respect to each of a plurality of areas in the feature image specified according to a distance from a viewpoint set for generating the feature image, such that a length of the character string in a vertical direction increases with a decrease in distance from the viewpoint.

主权项

1. A three-dimensional map display device for displaying a three-dimensional map in which features are expressed three-dimensionally, the three-dimensional map display device comprising:
a map database that stores map data used to display each feature three-dimensionally, in relation to character data representing a character string to be displayed in the three-dimensional map; a feature image generator that uses the map data to generate a feature image by perspective projection of each feature from a specified viewpoint; and a character display controller that uses the character data to control display of the character string on the feature image, wherein the character display controller changes over at least one of a display direction and a number of display lines of the character string with respect to each of a plurality of areas in the feature image specified according to a distance from the viewpoint, such that a length of the character string in a vertical direction increases with a decrease in distance from the viewpoint.