Browse Prior Art Database

Automatic Box Graphic CHARACTER Shaper

IP.com Disclosure Number: IPCOM000038969D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 3 page(s) / 76K

Publishing Venue

IBM

Related People

Smith, D: AUTHOR

Abstract

This invention provides the capability for personal computers to efficiently store and retrieve box graphic characters that are manipulated within software packages. The movement of the cursor is mapped to the complete set of displayable box graphic character shapes. All possible box graphic characters are drawn automatically, depending upon the (Image Omitted) cursor motion. The cursor is simply moved across the display screen, and the box graphic characters appear after the cursor in the correct shape with connectivity. As an example for the implementation of the algorithm of this invention, Fig. 1 shows an example of a box graphic broken down into a set of box graphic characters and finally the graphic elements making up the characters.

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Automatic Box Graphic CHARACTER Shaper

This invention provides the capability for personal computers to efficiently store and retrieve box graphic characters that are manipulated within software packages. The movement of the cursor is mapped to the complete set of displayable box graphic character shapes. All possible box graphic characters are drawn automatically, depending upon the

(Image Omitted)

cursor motion.

The cursor is simply moved across the display screen, and the box graphic characters appear after the cursor in the correct shape with connectivity. As an example for the implementation of the algorithm of this invention, Fig. 1 shows an example of a box graphic broken down into a set of box graphic characters and finally the graphic elements making up the characters. Thus, up to 11 different character shapes are needed, with only four keys active on the keyboard to enter the data. The cursor keys move the cursor around the display screen, and the invention provides the connected box graphic characters. A character mapping algorithm results from a finite state machine and a set of truth tables. The algorithm converts or maps all displayable connectable box graphic elements according to their positioning within a graphical representation and the elements drawn depending upon cursor movement. Fig. 2 shows that the cursor may move in one of four directions, and, for each of the cursor motions, information is required about only

(Image Omitted)

two graphical representations which are already displayed on the screen. These two information areas are sampled during cursor motion and analyzed as to their shape. The finite state machine in Fig. 3 can be readily established, depending on the four states of cursor movement. Each of the four states or directions have a specific sub-set of box graphic character shapes that apply to that state. Fig. 3 identifies all shapes and associated states.

(Image Omitted)

The cursor motion, as depicted in Fig. 2, can then combine with the sub-sets of box graphic characters and the finite state machine of the Fig. 3 to produce truth tables, as shown in Fig. 4, for the horizontal directions, and Fig. 5 for the vertical direc...