+++ /dev/null
-/*
- * 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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