Fw: [barcode] barcode on PCL printer

[Andrea Scopece]

----- Original Message -----
From: "Andrea Scopece" <a.scopece@vizzavi.it>
To: <r.krebs@netlab.ch>
Cc: "Alessandro Rubini - FSFE" <rubini@fsfeurope.org>;
<barcode@lists.linux.it>
Sent: Saturday, October 19, 2002 3:06 AM
Subject: Re: [barcode] barcode on PCL printer


> Well, I finally double-checked PCL output versus PS output:
>
> PS output use Points as unit of measure, with a precision of  1/100,
> therefore equivalent to 1/7200 of Inch.
>
> PCL output was using decipoints, with unitary precision, equivalent to
1/720
> of Inch.
>
> I changed pcl.c code, for use of decipoints with a precision of 1/10,
> therefore
> equivalent to PS output, and checked it, it look bar width were corrected,
> but
> x coordinates positions were a little different from PS output.
> (probably when I writed pcl.c, and I looked manuals, I see the range value
> (0-32676),
> and don't see a note that command allow for 2 decimal places)
>
> Finally I realized that when pcl.c was corrected for difference about
> drawing from PS and PCL,
> (PS line drawing need center coordinate of the bar, PCL rectangular are
fill
> needs left x coordinate of the bar), that patch don't take in account for
> SHRINK_AMOUNT.
>
> Now, PCL output value look like PS output value.
>
> Please, try the following patch:
>
> -----------------------snip------------------------
> diff -ur barcode-0.98/pcl.c work2/pcl.c
> --- barcode-0.98/pcl.c Tue Nov 13 13:38:19 2001
> +++ work2/pcl.c Sat Oct 19 02:41:08 2002
> @@ -131,7 +131,7 @@
>   if (isdigit (*ptr))   j = *ptr-'0';
>   else                  j = *ptr-'a'+1;
>   if (i%2) { /* bar */
> -     x0 = bc->xoff + xpos;
> +     x0 = bc->xoff + xpos + SHRINK_AMOUNT/2.0;
>              y0 = bc->yoff + bc->margin;
>              yr = bc->height;
>              if (!(bc->flags & BARCODE_NO_ASCII)) { /* leave space for
text
> */
> @@ -145,10 +145,10 @@
>    }
>       }
>
> -     fprintf(f,"%c&a%.0fH", 27, x0 * 10.0);
> -     fprintf(f,"%c&a%.0fV", 27, y0 * 10.0);
> -     fprintf(f,"%c*c%.0fH", 27, ((j*scalef)-SHRINK_AMOUNT) * 10.0);
> -     fprintf(f,"%c*c%.0fV", 27, yr * 10.0);
> +     fprintf(f,"%c&a%.1fH", 27, x0 * 10.0);
> +     fprintf(f,"%c&a%.1fV", 27, y0 * 10.0);
> +     fprintf(f,"%c*c%.1fH", 27, ((j*scalef)-SHRINK_AMOUNT) * 10.0);
> +     fprintf(f,"%c*c%.1fV", 27, yr * 10.0);
>       fprintf(f,"%c*c0P\n", 27);
>   }
>   xpos += j * scalef;
>
> -----------------------snip------------------------
>
> Best Regards
>
> Andrea Scopece
>