.BG
.FN hp2623
.FN hp2627
.FN hp2628
.FN hp2648
.FN hp2393
.FN hp2397
.FN hp150
.TL
Hewlett-Packard Graphics Terminals
.CS
hp2623(ask=F, file="")
hp2627(ask=F, file="")
hp2628(ask=F, file="")
hp2648(ask=F, file="")
hp2393(ask=F, file="")
hp2397(ask=F, file="")
hp150(ask=F, file="")
.AG ask
should device driver print the message "GO?"
to ask permission to clear the screen?
.AG file
character file name where output should be sent.
This enables the characters that would have been sent to the
terminal to be caught in a file for later plotting.
By default, output is sent to the terminal.
.PP
If `ask' is `TRUE',
whenever a new plot is about to be produced the message "GO?" appears
on the alpha screen.  This allows further viewing,
making a hard copy, etc., before the graphics
screen is erased.  When ready for
plotting to proceed, simply hit carriage return.
.PP
When graphic input (`identify', `locator') is requested from this
terminal, the graphic cursor appears.
Use the arrow keys to position
the cursor at the desired point, and then type
any single character.
For an HP2393 or HP2397 with a mouse,
use the mouse to position the crosshairs at the point,
and click the right button.
(It is still possible to use the arrow keys.)
A carriage return alone will terminate graphic input
without transmitting the point.
.PP
There are eight character sizes (1 to 8)
and characters
can be rotated by multiples of 90 degrees.
There are 7 line types (1 to 7) giving solid, dotted, short-dashed,
long-dashed, dot-space-dash, dot-dot-dot and dot-dashed lines.
.PP
HP2623, HP150 and HP2648 terminals
can fill rectangles (as generated by barplots) in
8 patterns (selected by setting `col'
to a number between 1 and 8): solid, small checkerboard, large checkerboard,
one white/3 black, very large checkerboard, spiral, diamond, and lattice.
HP2628 and HP2393 terminals can fill arbitrary polygons with these
patterns.
HP2627 and HP2397 can fill arbitrary polygons in color.
Setting `col' to a number between 0 and 7 inclusive selects the corresponding
color from the system palette.
Setting `col' to a number between 8 and 25 inclusive selects one of the
eighteen pre-defined dithered colors.
Setting `col' to a negative number selects a colored pattern.  The units digit
of `col' is used to select a color from the system palette, and the tens digit
is used to select a pre-defined area fill pattern.
.PP
A device must be specified before any graphics functions can be used.
.KW device
.WR
