[13221] in Athena Bugs
NetProb ticket #3081, rsaix 7.7J: HPLJ4siMX printers
daemon@ATHENA.MIT.EDU (mbarker@MIT.EDU)
Thu Feb 16 15:48:22 1995
From: mbarker@MIT.EDU
Date: Thu, 16 Feb 1995 15:48:11 -0500
To: hftsai@MIT.EDU, bugs@MIT.EDU
Cc:
hi, Harry.
what you are seeing is interference. if you remove the .75 setgray line
near the end, you can print a full grid.
you can also do some other gameplaying (.6 gives an interesting effect).
thanks for the report.
mike
DCNS
>From hftsai@MIT.EDU Thu Feb 16 00:01:23 1995
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>Message-Id: <9502160501.AA22074@w20-575-105.MIT.EDU>
>To: bugs@MIT.EDU
>Subject: rsaix 7.7J: HPLJ4siMX printers
>Date: Thu, 16 Feb 1995 00:01:16 EST
>From: Harry Tsai <hftsai@MIT.EDU>
>
>System name: w20-575-105
>Type and version: POWER 7.7J
>Display type: POWER_Gt1
>
>What were you trying to do?
> Write a PostScript program to print a full-page grid
> with .1 inch spacing. (Program text included below.)
>
>What's wrong:
> The grid is missing a large block of vertical lines. From 1.3 inches
> from the left of the paper to 4.2 inches from the left (approximately
> the middle of the page), there simply are no vertical lines.
>
> This problem only occurs on the [Athena HPLJ4siMX] printers.
> I tried two different printers, pulp and fiber, with the same
> results on both. The GhostScript interpreter (/mit/gnu/bin/gs),
> on the other hand, does the right thing, displaying a complete
> grid on my screen.
>
>What should have happened:
> The printers' PostScript interpreters shouldn't randomly lose
> parts of my graphic, especially when an alternate PostScript
> interpreter (GhostScript) gives me the result I thought I would
> be getting.
>
>Please describe any relevant documentation references:
> This is the bare bones of my program. The full version also prints
> some numbers propagating from the corners of the page, but this
> simplified version is enough to demonstrate the bug. The full version
> is in /mit/hftsai/Public/grid.ps
>
>%!
>
>/inch {72 mul} def
>
>/width 8.5 inch def
>/height 11 inch def
>
>/gridsize .1 inch def
>
>% y hline--draws a horizontal line across the page at height y
>/hline {
> /y exch def
> 0 y moveto
> width 0 rlineto
>} def
>
>% x vline--draws a vertical line the full height of the page at x
>/vline {
> /x exch def
> x 0 moveto
> 0 height rlineto
>} def
>
>0 gridsize width {vline} for
>0 gridsize height {hline} for
>
>0 setlinewidth
>.75 setgray
>stroke
>
>showpage
>
>
