Map symbol drawing device

Patent metadata

Field	Value
Publication number	US-8994727-B2
Application number	US-201013824022-A
Country	US
Kind code	B2
Filing date	Nov 9, 2010
Priority date	Nov 9, 2010
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

A symbol cache checking part for checking to see whether or not an image of a symbol of the same type as a symbol to be drawn is written in a texture. When the symbol cache checking part determines that an image of a symbol of the same type as the symbol to be drawn is written in a texture, a texture coordinate setting part sets the write position of the above-mentioned symbol in the texture to the vertices of a 3D polygon generated by a polygon generating part as texture coordinates, and a polygon drawing unit 40 draws this 3D polygon.

First claim

The invention claimed is:

1. A map symbol drawing device comprising:
a texture generating unit for generating one or more textures within limits of a maximum size in a memory which can be used as textures;
a number-of-references counting unit for counting a number of references per symbol type to symbols existing in a map;
a symbol image writing unit for acquiring images of a number of symbols having a larger number of references per symbol type which is counted by said number…

Assignees

• Tomaru Yoshihiro
• Mitsubishi Electric Corp

Inventors

• Tomaru Yoshihiro

Classifications

• G06T15/04

  Physics · mapped topic

• G01C21/367 Primary

  Physics · mapped topic

• G06T17/10 Primary

  Physics · mapped topic