Browse Prior Art Database

Simulation of Opaque 3270 Alphanumeric Fields in Advance Function Printer Data Streams

IP.com Disclosure Number: IPCOM000110819D
Original Publication Date: 1994-Jan-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 4 page(s) / 95K

Publishing Venue

IBM

Related People

Kelly, J: AUTHOR

Abstract

Described is a method that enable Advanced Printer Data Stream (AFPDS) graphic documents to print opaque alphanumeric fields so that the printed page accurately represents the equivalent 3270 screen display. Avoided is having to check if any graphics/image object in the file overlaps any opaque field and if found generating appropriate blank areas or graphics images.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Simulation of Opaque 3270 Alphanumeric Fields in Advance Function
Printer Data Streams

      Described is a method that enable Advanced Printer Data Stream
(AFPDS) graphic documents to print opaque alphanumeric fields so that
the printed page accurately represents the equivalent 3270 screen
display.  Avoided is having to check if any graphics/image object in
the file overlaps any opaque field and if found generating
appropriate blank areas or graphics images.

      An application may generate an Advanced Printer Data Stream
data file containing combinations of text graphics/image, for
printing on an intelligent printer, using a printer driver like Print
Services Facility (PSF).  The application may want to emulate what is
seen on a users display, giving the user the option to do a 'screen
dump' from his/her display to the PSF printer.  Emulation of the
Alphanumerics can be done by converting to presentation text in the
AFPDS file.

      The difficulty is when opaque alphanumerics are displayed with
underlying graphics/image.  Presentation text is transparent, so
there is a need to 'blank out' the area behind the alpha to give a
faithful representation of the screen display, normally done by
drawing areas of white image/graphics behind the alpha in a complex
process.

      Disclosed is an easy method for blanking out the area behind
the alphanumeric data, using existing presentation text commands, on
printers which support 'setcolor to color-of-medium(paper)'.  Note
that AFPDS files containing this type of datastream are commonly
known as LIST3820 or LIST38PP files.

      AFPDS data files can contain several types of object.
Graphics, Image and Text are three of these.  Each of the object
types is defined by a certain a...