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/*
* ps.c -- printing the "partial" bar encoding
*
* Copyright (c) 1999 Alessandro Rubini (rubini@gnu.org)
* Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "barcode.h"
#define SHRINK_AMOUNT 0.15 /* shrink the bars to account for ink spreading */
/*
* How do the "partial" and "textinfo" strings work?
*
* The first char in "partial" tells how much extra space to add to the
* left of the bars. For EAN-13, it is used to leave space to print the
* first digit, other codes may have '0' for no-extra-space-needed.
*
* The next characters are alternating bars and spaces, as multiples
* of the base dimension which is 1 unless the code is
* rescaled. Rescaling is calculated as the ratio from the requested
* width and the calculated width. Digits represent bar/space
* dimensions. Lower-case letters represent those bars that should
* extend lower than the others: 'a' is equivalent to '1', 'b' is '2' and
* so on.
*
* The "textinfo" string is made up of fields "%lf:%lf:%c" separated by
* blank space. The first integer is the x position of the character,
* the second is the font size (before rescaling) and the char item is
* the charcter to be printed.
*
* Both the "partial" and "textinfo" strings may include "-" or "+" as
* special characters (in "textinfo" the char should be a standalone
* word). They state where the text should be printed: below the bars
* ("-", default) or above the bars. This is used, for example, to
* print the add-5 and add-2 codes to the right of UPC or EAN codes
* (the add-5 extension is mostly used in ISBN codes.
*/
int Barcode_ps_print(struct Barcode_Item *bc, FILE *f)
{
int i, j, k, barlen, printable=1;
double f1, f2, fsav=0;
int mode = '-'; /* text below bars */
double scalef=1, xpos, x0, y0, yr;
unsigned char *ptr;
unsigned char c;
if (!bc->partial || !bc->textinfo) {
bc->error = EINVAL;
return -1;
}
/*
* Maybe this first part can be made common to several printing back-ends,
* we'll see how that works when other ouput engines are added
*/
/* First, calculate barlen */
barlen = bc->partial[0] - '0';
for (ptr = bc->partial+1; *ptr; ptr++)
if (isdigit(*ptr))
barlen += (*ptr - '0');
else if (islower(*ptr))
barlen += (*ptr - 'a'+1);
/* The scale factor depends on bar length */
if (!bc->scalef) {
if (!bc->width) bc->width = barlen; /* default */
scalef = bc->scalef = (double)bc->width / (double)barlen;
}
/* The width defaults to "just enough" */
if (!bc->width) bc->width = barlen * scalef +1;
/* But it can be too small, in this case enlarge and center the area */
if (bc->width < barlen * scalef) {
int wid = barlen * scalef + 1;
bc->xoff -= (wid - bc->width)/2 ;
bc->width = wid;
/* Can't extend too far on the left */
if (bc->xoff < 0) {
bc->width += -bc->xoff;
bc->xoff = 0;
}
}
/* The height defaults to 80 points (rescaled) */
if (!bc->height) bc->height = 80 * scalef;
#if 0
/* If too small (5 + text), enlarge and center */
i = 5 + 10 * ((bc->flags & BARCODE_NO_ASCII)==0);
if (bc->height < i * scalef ) {
int hei = i * scalef;
bc->yoff -= (hei-bc->height)/2;
bc->height = hei;
if (bc->yoff < 0) {
bc->height += -bc->yoff;
bc->yoff = 0;
}
}
#else
/* If too small (5 + text), reduce the scale factor and center */
i = 5 + 10 * ((bc->flags & BARCODE_NO_ASCII)==0);
if (bc->height < i * scalef ) {
double scaleg = ((double)bc->height) / i;
int wid = bc->width * scaleg / scalef;
bc->xoff += (bc->width - wid)/2;
bc->width = wid;
scalef = scaleg;
}
#endif
/*
* Ok, then deal with actual ps (eps) output
*/
if (!(bc->flags & BARCODE_OUT_NOHEADERS)) { /* spit a header first */
if (bc->flags & BARCODE_OUT_EPS)
fprintf(f, "%%!PS-Adobe-2.0 EPSF-1.2\n");
else
fprintf(f, "%%!PS-Adobe-2.0\n");
fprintf(f, "%%%%Creator: libbarcode\n");
if (bc->flags & BARCODE_OUT_EPS) {
fprintf(f, "%%%%BoundingBox: %i %i %i %i\n",
bc->xoff,
bc->yoff,
bc->xoff + bc->width + 2* bc->margin,
bc->yoff + bc->height + 2* bc->margin);
}
fprintf(f, "%%%%EndComments\n");
if (bc->flags & BARCODE_OUT_PS) {
fprintf(f, "%%%%EndProlog\n\n");
fprintf(f, "%%%%Page: 1 1\n\n");
}
}
/* Print some informative comments */
for (i=0; bc->ascii[i]; i++)
if (bc->ascii[i] < ' ')
printable = 0;
fprintf(f,"%% Printing barcode for \"%s\", scaled %5.2f",
printable ? bc->ascii : "<unprintable string>", scalef);
if (bc->encoding)
fprintf(f,", encoded using \"%s\"",bc->encoding);
fprintf(f, "\n");
fprintf(f,"%% The space/bar succession is represented "
"by the following widths (space first):\n"
"%% ");
for (i=0; i<strlen(bc->partial); i++) {
unsigned char c = bc->partial[i];
if (isdigit(c)) putc(c, f);
if (islower(c)) putc(c-'a'+'1', f);
if (isupper(c)) putc(c-'A'+'1', f);
}
/* open array for "forall" */
fprintf(f, "\n[\n%% height xpos ypos width"
" height xpos ypos width\n");
xpos = bc->margin + (bc->partial[0]-'0') * scalef;
for (ptr = bc->partial+1, i=1; *ptr; ptr++, i++) {
/* special cases: '+' and '-' */
if (*ptr == '+' || *ptr == '-') {
mode = *ptr; /* don't count it */ i++; continue;
}
/* j is the width of this bar/space */
if (isdigit (*ptr)) j = *ptr-'0';
else j = *ptr-'a'+1;
if (i%2) { /* bar */
x0 = bc->xoff + xpos + (j*scalef)/2;
y0 = bc->yoff + bc->margin;
yr = bc->height;
if (!(bc->flags & BARCODE_NO_ASCII)) { /* leave space for text */
if (mode == '-') {
/* text below bars: 10 points or five points */
y0 += (isdigit(*ptr) ? 10 : 5) * scalef;
yr -= (isdigit(*ptr) ? 10 : 5) * scalef;
} else { /* '+' */
/* text above bars: 10 or 0 from bottom, and 10 from top */
y0 += (isdigit(*ptr) ? 10 : 0) * scalef;
yr -= (isdigit(*ptr) ? 20 : 10) * scalef;
}
}
/* Define an array and then use "forall" (Hans Schou) */
fprintf(f," [%5.2f %6.2f %6.2f %5.2f]%s",
yr, x0, y0, (j * scalef) - SHRINK_AMOUNT,
i%4 == 1 ? " " : "\n");
}
xpos += j * scalef;
}
fprintf(f,"\n]\t{ {} forall setlinewidth moveto 0 exch rlineto stroke} "
"bind forall\n");
/* Then, the text */
mode = '-'; /* reinstantiate default */
if (!(bc->flags & BARCODE_NO_ASCII)) {
fprintf(f, "[\n%% char xpos ypos fontsize\n");
k=0; /* k is the "previous font size" */
for (ptr = bc->textinfo; ptr; ptr = strchr(ptr, ' ')) {
while (*ptr == ' ') ptr++;
if (!*ptr) break;
if (*ptr == '+' || *ptr == '-') {
mode = *ptr; continue;
}
if (sscanf(ptr, "%lf:%lf:%c", &f1, &f2, &c) != 3) {
fprintf(stderr, "barcode: impossible data: %s\n", ptr);
continue;
}
fprintf(f, " [(");
/* Both the backslash and the two parens are special */
if (c=='\\' || c==')' || c=='(')
fprintf(f, "\\%c) ", c);
else
fprintf(f, "%c) ", c);
fprintf(f, "%6.2f %6.2f %5.2f]\n",
bc->xoff + f1 * scalef + bc->margin,
mode == '-'
? (double)bc->yoff + bc->margin
: (double)bc->yoff + bc->margin+bc->height - 8*scalef,
fsav == f2 ? 0.0 : f2 * scalef);
fsav = f2;
}
fprintf(f,"] { {} forall dup 0.00 ne {\n\t"
"/Helvetica findfont exch scalefont setfont\n"
" } {pop} ifelse\n"
" moveto show} bind forall\n");
}
fprintf(f,"%% End barcode for \"%s\"\n\n",
printable ? bc->ascii : "<unprintable string>");
if (!(bc->flags & BARCODE_OUT_NOHEADERS)) {
if (bc->flags & BARCODE_OUT_PS) {
fprintf(f,"showpage\n");
fprintf(f, "%%%%Trailer\n\n");
}
}
return 0;
}
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