Re: [Gimp-print-devel] horizontal motion?

[Robert L K. <rl...@al...>]

   From: sh...@al...
   Date: Thu, 10 Feb 2000 00:10:46 +0900

   Ok, I'm trying to follow the horizontal print head motions.  Here's a
   section of ESCP2 output from gimp-print:

   00000008  1b  (  U 05 00 02 02 01 a0 05 
	  :
   00000048  1b  (  V 04 00 00 00 00 00 
   00000051  1b  (  r 02 00 00 02 
   00000058  1b  \ a6 ff 
   0000005c  1b  . 01 05 05 01 be 05  (1470, 1) *0d 
   0000010c  1b  (  r 02 00 00 01 
   00000113  1b  \ a6 ff 
   00000117  1b  . 01 05 05 01 be 05  (1470, 1) *0d 
   00000176  1b  (  r 02 00 00 04 
   0000017d  1b  \ a6 ff 
   00000181  1b  . 01 05 05 01 be 05  (1470, 1) *0d 
   00000245  1b  (  r 02 00 01 02 
   0000024c  1b  \ a6 ff 

   Roughly translated to English it's:

   Use 1/720" page 1/720" vertical and 1/1440" horizontal units
     :

Right.  It's interesting that it's using the ESC\ command, but for now
we'll let that pass.

   Move to top of page
   Select color cyan
   Move left 90*1/1440"
   Print at 720 DPI one line of 1470 pixels with an extra 0xd at the end (???)

That extra 0xd is a carriage return.

   Select color magenta
   Move left 90*1/1440"
   Print at 720 DPI one line of 1470 pixels with an extra 0xd at the end (???)
   etc.

   My question is, why is it only moving 90 ticks to the left when it's printing
   2940 ticks to the right?  The printer head should hit the right edge of the
   page in no time this way, no?  What am I missing?

Urgh.  This -90 ticks looks like a problem.  Perhaps this is what's
causing all the grief?

-- 
Robert Krawitz <rl...@al...>      http://www.tiac.net/users/rlk/

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail lp...@uu...
Project lead for The Gimp Print --  http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton