Technique for scaling characters in a stroke-vector display system
US4672370A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1984 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Nov 1, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique is disclosed for use in an electronic raster-scan display system, for generating characters of variable size using a stroke-vector technique. An incoming data signal defines the type of character to be displayed, the horizontal X and vertical Y character field dimensions, the character drawing point, and any character rotation or reflection. Using that part of the data signal that defines the character type as a memory address, a character microprogram is retrieved containing a stroke-vector character mask and a stroke resolution factor representing the number x of horizontal stroke-vectors in a straight line and the number y of vertical stroke-vectors in a straight line that are used by said character mask to represent said character within a normalized character field. To scale the size of the stroke-vectors the horizontal length stroke-vector attribute DX-LENGTH is forming by taking the quotient X/x, and the vertical length stroke-vector attribute DY-LENGTH is forming by taking the quotient Y/y. Then the DX-LENGTH attribute and the DY-LENGTH attribute are converted from the display screen coordinate system to a virtual screen coordinate system having a greater resolu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.