File: pcl.c

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/*
 * pcl.c -- printing the "partial" bar encoding in PCL format
 *
 * Copyright (c) 1999 Alessandro Rubini (rubini@gnu.org)
 * Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
 * Copyright (c) 2001 Andrea Scopece (a.scopece@tin.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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "barcode.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#define SHRINK_AMOUNT 0.15  /* shrink the bars to account for ink spreading */


/*
 * How do the "partial" and "textinfo" strings work? See file "ps.c"
 */


/* relative cursor movement from absolute xold to absolute xnew,
updating xold in place */
void gotox(FILE *f,double *xold,double xnew)
{
    double delta = xnew - *xold;
    if (delta) {
      fprintf(f,"%c&a%+.0fH", 27, delta * 10.0);
    }
    *xold = xnew;
}

/* relative cursor movement from absolute yold to absolute xnew,
updating yold in place */
void gotoy(FILE *f,double *yold,double ynew)
{
    double delta = ynew - *yold;
    if (delta)
      fprintf(f,"%c&a%+.0fV", 27, delta * 10.0);
    *yold = ynew;
}
 
int Barcode_pcl_print(struct Barcode_Item *bc, FILE *f)
{
    int i, j, barlen;
    double f1, f2, fsav=0;
    int mode = '-'; /* text below bars */
    double scalef=1, xpos, xabs, yabs, yr;
    double textyoffset;
    char *ptr;
    char c;

    char font_id[6];           /* default font, should be "scalable" */
    /* 0     Line printer,    use on older LJet II, isn't scalable   */
    /* 4148  Univers,         use on LJet III series, and Lj 4L, 5L  */
    /* 16602 Arial,           default LJ family 4, 5, 6, Color, Djet */

    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

    /*
     * deal with PCL output
     */
    textyoffset = (mode != '-'
	? ((double)8*scalef)
	: ((double)bc->height));
    xabs = - bc->xoff;
    yabs = - bc->yoff;
    if (!streaming) {
    	fprintf(f, "%c&a0H", 27);
    	fprintf(f, "%c&a0V", 27);
    }
    xpos = bc->margin + (bc->partial[0]-'0') * scalef;
    for (ptr = bc->partial+1, i=1; *ptr; ptr++, i++) {
	double x0, y0;
	/* 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 = xpos + SHRINK_AMOUNT/2.0;
            y0 = 0;
            yr = bc->height;
            if (!(bc->flags & BARCODE_NO_ASCII)) { /* leave space for text */
		if (mode == '-') {
		    /* text below bars: 10 points or five points */
		    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; 
		}
	    }

	    gotox(f,&xabs,x0);
	    if (streaming)
               gotoy(f, &yabs, y0 - textyoffset);
	    else
               gotoy(f, &yabs, y0);
	    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", 27);
	}
	xpos += j * scalef;
    }

    /* the text */

    if (streaming)
       gotoy(f, &yabs, 0);
    else
       gotoy(f, &yabs, textyoffset);

    mode = '-'; /* reinstantiate default */
    if (!(bc->flags & BARCODE_NO_ASCII)) {
        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;
            }

    /* select a Scalable Font */

	    if (fsav != f2 && !streaming) {
    	       	if ((bc->flags & BARCODE_OUT_PCL_III) == BARCODE_OUT_PCL_III)
			strcpy(font_id, "4148");	/* font Univers */
		else
			strcpy(font_id, "16602");	/* font Arial */
		fprintf(f,"%c(8U", 27);
	        fprintf(f,"%c(s1p%5.2fv0s0b%sT", 27, f2 * scalef, font_id);
	    }
	    fsav = f2;
	    gotox(f, &xabs, f1 * scalef + bc->margin);
    /* print the char, reverse print direction by 180, print it again but
       invisibly, restore print direction, transparency, opacity. After that
       we are at the original position again, so we know exactly where we
       are without having to account for the character width */
	    fprintf(f, "%c%c&a180P%c*vo1T%c%c&a0P%c*v1oT", c, 27, 27, c, 27, 27);
	}

    }
    if (streaming) {
	gotox(f, &xabs, xpos + bc->margin);
	gotoy(f, &yabs, - bc->yoff);
    }
	

    return 0;
}