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Centering Fixed Length Text Lines on Displays Having Different Line Lengths

IP.com Disclosure Number: IPCOM000046956D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cason, WC: AUTHOR [+3]

Abstract

A word processor requires several different programs to run it. In the case of a word processor which may have either a half-page or full-page display, each program must be able to run a Display Write System that provides a display with either 25 lines and 80 characters per line or 66 lines and 100 characters per line. The application programs, such as text message, prompts and the like, are isolated from the display hardware and use the Display Access Method to format their data streams into the display refresh buffer so that the hardware can read the refresh buffer and display the data on the CRT screen. Some of these application programs have predefined text lines based on the line length of the smaller, half-page display so that the data is properly centered.

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Centering Fixed Length Text Lines on Displays Having Different Line Lengths

A word processor requires several different programs to run it.

In the case of a word processor which may have either a half-page or full-page display, each program must be able to run a Display Write System that provides a display with either 25 lines and 80 characters per line or 66 lines and 100 characters per line. The application programs, such as text message, prompts and the like, are isolated from the display hardware and use the Display Access Method to format their data streams into the display refresh buffer so that the hardware can read the refresh buffer and display the data on the CRT screen. Some of these application programs have predefined text lines based on the line length of the smaller, half-page display so that the data is properly centered. The centering of these text lines presents a pleasing appearance to the operator. However, when these same text lines are displayed on the full-page display, they are displayed off-center to the left due to more character spaces in the lines. The result is an unbalanced appearance to the operator which is not as pleasing as a centered presentation would be. This problem can be solved by using the Display Access Method. Since the Display Access Method must know what type of display it is working with, it supports a command that the application programs can send to the Display Access Method to center the fixed length text lines.

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