Browse Prior Art Database

Vector Character Fonts in an All-Points-Addressable Printer

IP.com Disclosure Number: IPCOM000060529D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Loflin, BA: AUTHOR

Abstract

A method is described which provides printers with all-points addressable (APA) capability, the ability to reproduce multiple sizes of a given font in any direction and orientation without requiring operator intervention or excessive font storage in the printer. The specific problem addressed is to decrease the memory needed for multiple font sizes and orientations by using vector-defined fonts, and to provide the ability to shear characters. The advent of APA (or matrix, or non-engraved) printing technology provides the capability to print any image that can be defined, within the limits of the printing technology resolution. This provides the ability for a printer to support multiple font sizes and multiple character orientations. It also provides the ability to shear characters.

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Vector Character Fonts in an All-Points-Addressable Printer

A method is described which provides printers with all-points addressable (APA) capability, the ability to reproduce multiple sizes of a given font in any direction and orientation without requiring operator intervention or excessive font storage in the printer. The specific problem addressed is to decrease the memory needed for multiple font sizes and orientations by using vector-defined fonts, and to provide the ability to shear characters. The advent of APA (or matrix, or non- engraved) printing technology provides the capability to print any image that can be defined, within the limits of the printing technology resolution. This provides the ability for a printer to support multiple font sizes and multiple character orientations. It also provides the ability to shear characters. A font defined in vector format means that, instead of a pel (picture element) image definition, the data contains vectors to draw the character much the same way a plotter does. Since vectors are specified in world coordinates (i.e., not physical coordinates) they must be mapped to the specific physical coordinates necessary to print them on the page. It is during this mapping process that the characters can be scaled to any size, orientation, or shear angle. Therefore, only one vector font definition per font style is needed, and then any size and orientation can be produced from it. The quality of the font is preserved bec...