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Method of Using GDDM Vector Symbols to Accurately Show Composed Page Datastream Text

IP.com Disclosure Number: IPCOM000039307D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 3 page(s) / 25K

Publishing Venue

IBM

Related People

Howe, DF: AUTHOR

Abstract

This article describes a technique for using a single vector symbol set to accurately display Composed Page Datastream text by modifying the character box size before each word is drawn. This makes it unnecessary to use a unique GDDM vector symbol set for each symbol set or to have to position each character of each word individually. There are two different IBM products that use the Graphical Data Display Manager (GDDM) to show a page of a Composed Page Datastream document on a display screen. These products are: The Interactive Composition and Edit Facility Version 2 (ICEF2) The Composed Document View Utility (CDVU), part of the Graphical Display and Query Facility (GDQF).

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Method of Using GDDM Vector Symbols to Accurately Show Composed Page Datastream Text

This article describes a technique for using a single vector symbol set to accurately display Composed Page Datastream text by modifying the character box size before each word is drawn. This makes it unnecessary to use a unique GDDM vector symbol set for each symbol set or to have to position each character of each word individually. There are two different IBM products that use the Graphical Data Display Manager (GDDM) to show a page of a Composed Page Datastream document on a display screen. These products are: The Interactive Composition and Edit Facility Version 2

(ICEF2)

The Composed Document View Utility (CDVU), part of the

Graphical Display and Query Facility (GDQF). For these applications to be of use for accurately checking the final appearance of the document, they must ensure that the text appears on the screen, as nearly as is possible, identical to that on the final printed page. Problems arise due to the sophisticated character spacing in the Composed Page Datastream. The formatting process and the use of different typographical font styles and sizes will cause different character spacings to be used. The GDDM vector symbols, however, have fixed widths. If text is simply shown with a GDDM GSCHAR call using a single vector symbol set, then width of words will be wrong. This will mean that the display cannot be used to check the final appearance of the printed page. To overcome this problem, the application programs used the following techniques: ICEF2 dynamically created a unique vector symbol for

every different font style and size, to reflect the

different widths for each.

CDVU positioned each character of each word

individually. If either of these techniques is used with a 3270-PC/G or /GX workstation, the...