--- /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;
+}
+
+
+
+
projects / glabels / blobdiff