src/hpgl.cc

   1 /* hpgl.cc
   2  * Export from Aven as HPGL.
   3  */
   4 /* Copyright (C) 1993-2003,2005,2010,2014,2015,2016,2019 Olly Betts
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <stdio.h>
  26
  27 #include "hpgl.h"
  28 #include "useful.h"
  29
  30 # define HPGL_USE_UC
  31 /*# define HPGL_USE_SR */ /* for text sized relative to page size */
  32
  33 # define HPGL_UNITS_PER_MM 40
  34 # define HPGL_EOL "\003" /* terminates labelling commands: LB<string>\003 */
  35
  36 # ifndef HPGL_USE_UC
  37 #  define HPGL_SO "\016" /* shift in & shift out of extended character set */
  38 #  define HPGL_SI "\017"
  39 # endif
  40
  41 # define HPGL_CROSS_SIZE 28 /* length of cross arms (in HPGL units) */
  42
  43 static long xpPageWidth, ypPageDepth;
  44
  45 static long x_org = 0, y_org = 0;
  46 static bool fNewLines = fTrue;
  47 static bool fOriginInCentre = fFalse;
  48
  49 /* Check if this line intersects the current page */
  50 /* Initialise HPGL routines. */
  51 void HPGL::header(const char *, const char *, time_t,
  52                   double, double, double, double, double, double)
  53 {
  54    // FIXME: mm_across_page, mm_down_page, origin_in_centre, scale
  55    double PaperWidth = 9999999, PaperDepth = 9999999;
  56    fOriginInCentre = true;
  57
  58    xpPageWidth = (long)(HPGL_UNITS_PER_MM * (double)PaperWidth);
  59    ypPageDepth = (long)(HPGL_UNITS_PER_MM * (double)PaperDepth);
  60
  61    /* SR scales characters relative to P1 and P2 */
  62    /* SI scales characters to size given (in cm) */
  63    /* INitialise; Select Pen 1;  */
  64    /* Either: Scale chars Relative to P1 & P2 0.5,1.0 (2/3 deflt size) */
  65    /*     Or: Scale chars absolute to 2/3 of default size on A4 page */
  66    fputs("IN;SP1;"
  67 #ifndef HPGL_USE_UC
  68          "CA-1;GM0,800;" /* Char set Alternate -1; Get Memory; */
  69 #endif
  70 #ifdef HPGL_USE_SR
  71          "SR0.5,1.0;"
  72 #else
  73          "SI0.125,.179;"
  74 #endif
  75          , fh);
  76    if (fNewLines) PUTC('\n', fh);
  77
  78 #ifndef HPGL_USE_UC
  79    /* define degree and copyright symbols */
  80    fputs("DL32,10,30,12,30,13,29,13,27,12,26,10,26,9,27,9,29,"
  81          "10,30;DL40,0,0;", fh); /* Hope this works! Seems to for BP */
  82    if (fNewLines) PUTC('\n', fh);
  83
  84    fputs("DL67,16,14,16,18,17,22,19,25,22,28,26,30,31,31,37,32,"
  85          "43,32,49,31,53,30,58,28,61,25,63,22,64,18,64,14,63,10,"
  86          "61,7,58,4,53,2,49,1,43,0,37,0,31,1,26,2,22,4,19,7,17,10,"
  87          "16,14;", fh);
  88    if (fNewLines) PUTC('\n', fh);
  89
  90    fputs("DL41,4,20,3,19,0,23,-4,24,-9,24,-14,23,-17,22,-20,19,"
  91          "-21,16,-20,13,-17,10,-14,9,-9,8,-4,8,0,9,3,11,4,12;", fh);
  92    if (fNewLines) PUTC('\n', fh);
  93 #endif
  94 #if 0
  95    /* and set clipping (Input Window!) on plotter (left,bottom,right,top) */
  96    fprintf(fh, "IW%ld,%ld,%ld,%ld;", clip.x_min - x_org, clip.y_min - y_org,
  97            clip.x_min - x_org + xpPageWidth, clip.y_min - y_org + ypPageDepth);
  98 #endif
  99 }
 100
 101 void
 102 HPGL::line(const img_point *p1, const img_point *p, unsigned /*flags*/, bool fPending)
 103 {
 104    if (fPending) {
 105       fprintf(fh, "PU%ld,%ld;", long(p1->x - x_org), long(p1->y - y_org));
 106    }
 107    fprintf(fh, "PD%ld,%ld;", long(p->x - x_org), long(p->y - y_org));
 108 }
 109
 110 #define CS HPGL_CROSS_SIZE
 111 #define CS2 (2 * HPGL_CROSS_SIZE)
 112 void
 113 HPGL::cross(const img_point *p, bool /*fSurface*/)
 114 {
 115     fprintf(fh, "PU%ld,%ld;", long(p->x - x_org), long(p->y - y_org));
 116     /* SM plots a symbol at each point, but it isn't very convenient here   */
 117     /* We can write PDPR%d,%dPR%d,%d... but the HP7475A manual doesn't say  */
 118     /* clearly if this will work on older plotters (such as the HP9872)     */
 119     fprintf(fh, "PD;PR%d,%d;PR%d,%d;PU%d,0;PD%d,%d;PU%d,%d;PA;",
 120             CS, CS,  -CS2, -CS2,  CS2, /*0,*/  -CS2, CS2,  CS, -CS);
 121     if (fNewLines) PUTC('\n', fh);
 122 }
 123 #undef CS
 124 #undef CS2
 125
 126 void
 127 HPGL::label(const img_point *p, const char *s, bool /*fSurface*/, int)
 128 {
 129     /* LB is a text label, terminated with a ^C */
 130     fprintf(fh, "PU%ld,%ld;LB", long(p->x - x_org), long(p->y - y_org));
 131     while (*s) {
 132         switch (*s) {
 133             case '\xB0':
 134 #ifdef HPGL_USE_UC
 135                 /* draw a degree sign */
 136                 fputs(HPGL_EOL ";UC1.25,7.5,99,.25,0,.125,-.25,0,-.5,"
 137                       "-.125,-.25,-.25,0,-.125,.25,0,.5,.125,.25;LB", fh);
 138 #else
 139                 /* KLUDGE: this prints the degree sign if the plotter supports
 140                  * extended chars or a space if not, since we tried to redefine
 141                  * space.  Nifty, eh? */
 142                 fputs(HPGL_SO " " HPGL_SI, fh);
 143 #endif
 144                 break;
 145             case '\xA9':
 146 #ifdef HPGL_USE_UC
 147                 /* (C) needs two chars to look right! */
 148                 /* This bit does the circle of the (C) symbol: */
 149                 fputs(HPGL_EOL ";", fh);
 150                 if (fNewLines) PUTC('\n', fh);
 151                 fputs("UC2,3.5,99,0,1,0.125,1,0.25,.75,0.375,.75,"
 152                       ".5,.5,.625,.25,.75,.25,.75,0,.75,-.25,.625,-.25,"
 153                       ".5,-.5,.375,-.75,.25,-.75,.125,-1,0,-1,-0.125,-1,"
 154                       "-0.25,-.75,-0.375,-.75,-.5,-.5,-.625,-.25,-.75,-.25,"
 155                       "-.75,0,-.75,.25,-.625,.25,-.5,.5,-.375,.75,-.25,.75,"
 156                       "-.125,1;", fh);
 157                 if (fNewLines) PUTC('\n', fh);
 158                 /* And this bit's the c in the middle: */
 159                 fputs("UC.5,5,99,-.125,.25,-.375,.5,-.5,.25,-.625,0,"
 160                       "-.625,-.25,-.375,-.25,-.375,-.75,-.125,-.75,.125,-.75,"
 161                       ".375,-.75,.375,-.25,.625,-.25,.625,0,.5,.25,.375,.5,"
 162                       ".125,.25;", fh);
 163                 if (fNewLines) PUTC('\n', fh);
 164                 fputs("LB", fh);
 165 #else
 166                 fputs(HPGL_SO "(C)" HPGL_SI, fh);
 167 #endif
 168                 break;
 169             default:
 170                 PUTC(*s, fh);
 171         }
 172         s++;
 173     }
 174     fputs(HPGL_EOL ";", fh);
 175     if (fNewLines) PUTC('\n', fh);
 176 }
 177
 178 void
 179 HPGL::footer()
 180 {
 181    /* Clear clipping window;  New page.  NB PG is a no-op on the HP7475A */
 182    fputs("IW;PG;", fh);
 183    if (fNewLines) PUTC('\n', fh);
 184 }