Hewlett-Packard HPGL Plotters

HPGL (Hewlett-Packard Graphics Language) is a vector-graphics format for control of pen-plotters and laser-printers manufactured by Hewlett-Packard Co., and some other manufacturers. This PGPLOT device handler produces files that should be acceptable to most HPGL and HPGL/2 devices, specifically the HP7475A Plotter.
Device type code
/HPGL (landscape orientation), /VHPGL (portrait orientation).
Default file name
Default view surface dimensions
/HPGL: 16640 by 11040 pixels (16.38 by 10.87 inches)
/VHPGL: 110400 by 16640 pixels (nominally 10.87 by 16.38 inches)
These dimensions are chosen for 17 by 11-inch paper.
The nominal resolution is 1016 pixels/inch, but the actual resolution will vary depending on the display device.
Color capability
Color indices 1--6 are accepted, and are interpreted as pen numbers.
Input capability
Environment variables
If environment variable PGPLOT_GL_TERMINAL has value YES (or any string beginning with Y or y), it is assumed that the output device is a plotter connected before the terminal using the Y-cable (HP part #17455A), in which case the plotter is ``turned on'' and xon/xoff handshaking is enabled using escape sequences. Otherwise, it is the user's responsibility to add control codes, if needed. If there is more than one plot and the plot is on a terminal, a prompt will be generated, allowing the page to be advanced.
File format
HPGL files are plain text.
B. H. Toby, T. J. Pearson, 1988-1994.