Browse Prior Art Database

Boundary Checking Apparatus for Kerned Characters on Raster page Printers

IP.com Disclosure Number: IPCOM000052619D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Eiselen, ET: AUTHOR [+3]

Abstract

This invention relates to a method for detecting characters overhanging a page edge. The method is invoked in response to an embedded text control in a data stream applied to a printer.

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This is the abbreviated version, containing approximately 61% of the total text.

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Boundary Checking Apparatus for Kerned Characters on Raster page Printers

This invention relates to a method for detecting characters overhanging a page edge. The method is invoked in response to an embedded text control in a data stream applied to a printer. The method steps include: (1) establishing a right-hand margin as a function of the font type (kerned/nonkerned); (2) compiling a list of characters and page position until the margin is reached using a first estimator consisting of the current character position plus the character increment (CI) with respect to the margin; (3) upon the margin being reached and the font being nonkerned, signaling an error condition; (4) upon the margin being reached and the font being kerned, substituting a second estimator (position + width of the character) and testing the logical page edge, rather than the margin; and (5) continuing list compilation until the edge is reached.

In prior-art page composition of test data to be printed, the characters of a font were placed on the page according to the user's input and a "boundary check" was performed for every character so as to ensure that it was within the page boundaries. Relatedly, the width of character patterns is defined by Deltax values. The Deltax dimension is large enough to span all of the black picture elements (pels) in the pattern. The character increment is used to establish the next print position by moving the print position in the inline direction after the ...