/*
    This software may only be used by you under license from AT&T Corp.
    ("AT&T").  A copy of AT&T's Source Code Agreement is available at
    AT&T's Internet website having the URL:
    <http://www.research.att.com/sw/tools/graphviz/license/source.html>
    If you received this software without first entering into a license
    with AT&T, you have an infringing copy of this software and cannot use
    it without violating AT&T's intellectual property rights.
*/
#pragma prototyped

/* TODO:
 *  Use encoded form for polyline and polygon
 */
#include	"render.h"


#define SOLID  0
#define DOTTED 1
#define DASHED 2
#define INVIS  3
  /* Convert point (1/72 inch) to hpgl units (0.025 mm) */
#define PT2UNIT(p)  ((p)*(double)14.111)
#define PENW 0.0138
#define NPENS  32
#define CX(_x)   ((int)(_x))
#define CY(_y)   ((int)(_y))

    /* Origin of HP plotter from lower left corner, in points
     * This varies from plotter to plotter. We assume 1/4" and 
     * hope for the best.
     */
#define HP_OX     18
#define HP_OY     18

static  char    *raw_prefix = "";
static  char    *raw_suffix = "";
#ifdef NOTUSED_ERG_MUST_KNOW_WHY
static  char    *clr_prefix = "\033%-12345X@PJL ENTER LANGUAGE = HPGL2\n";
static  char    *clr_suffix = "\033%-12345X\n";
#endif
static  char    *pcl_prefix = "\033E\n\033%%0B\n";
static  char    *pcl_suffix = "\033%%0A\n";

static	int	    N_pages;
/* static 	point	Pages; */
static	double	Scale;
static 	point	Origin;
static	box		PB;
static  int     CurrentPen;
static  int     ColorsUsed;
static  char    *Sep = ";";
static  int     PageWidth;    /* Width of page, in points. */
static  char    *prefix;      /* Machine-dependent prefix and suffix */
static  char    *suffix;
/* static boolean	onetime = TRUE; */

#define MAXLINELEN   80
static  int     bufcnt;       /* Number of characters output on current line */
static  char *  text_hdr =    "LB";
static void output (char* str)
{
  char  *ptr = str;
  int   len;

  while (*ptr != '\0') ptr++;
  len = ptr-str;
  if (bufcnt+len > MAXLINELEN) {
    fputs("\n", Output_file);
    bufcnt = 0;
  }
  fputs(str,Output_file);
  if ((len > 0) && (*(ptr-1) == '\n')) bufcnt = 0;
  else bufcnt += len;
}

static void output_text (char* str)
{
  char  *ptr = str;
  int   len;
  char  text_tail[32];

  sprintf(text_tail,"\03%s\n",Sep);
  while (*ptr != '\0') ptr++;
  len = (ptr-str) + strlen(text_tail) + strlen(text_hdr);
  if (bufcnt+len > MAXLINELEN) {
    fputs("\n", Output_file);
  }
  fputs(text_hdr,Output_file);
  fputs(str,Output_file);
  fputs(text_tail,Output_file);
  bufcnt = 0;
}

#ifdef SMILE
void doSmile (void)
{
  fprintf(Output_file,
    "SP1SD1,341,2,1,4,14,5,0,6,0,7,5SSLO7PA%d,0LB\001\003IN\n",
    (int)PT2UNIT(PageWid-2*HP_OX));
    
}
#endif

static void setPen (int p)
{
  char   buffer[32];
  sprintf(buffer, "SP%d%s", p, Sep); output (buffer);
#ifdef HPDEBUG
  fprintf(stderr, "set pen %d\n", p);
#endif
  CurrentPen = p;
}

typedef struct {
  int      symbol;
  int      spacing;
  int      face;
  int      bold;
  int      italic;
  double   size;
} FontInfo;
static FontInfo dfltFont = {277,1,5,0,0,14.0};
static FontInfo coordFont = {277,1,5,0,0,8.0};
static FontInfo nullFont = {0,0,0,0,0,0.0};

  /* Font 0 is the stdfont; font 1 is the alt font */
typedef struct {
  FontInfo fonts[2];
  int      curfont;
} FontState;
static FontState fontState;

static int eqFontInfo(FontInfo *fi1, FontInfo *fi2)
{
  return ((fi1->face == fi2->face) && 
          (fi1->spacing == fi2->spacing) && 
          (fi1->bold == fi2->bold) && 
          (fi1->italic == fi2->italic) && 
          (fi1->size == fi2->size) && 
          (fi1->symbol == fi2->symbol));
}

typedef struct {
  unsigned char r, g, b;
} Color;

static int eqColor(Color *c1, Color *c2)
{
  return ((c1->r == c2->r) &&
          (c1->g == c2->g) &&
          (c1->b == c2->b));
}

static Color black = {0,0,0};
static Color white = {255,255,255};
static Color *colorlist;

typedef struct _gc {
  int        bold;
  int        style;
  Color      color;
  FontInfo   font;
  struct _gc *prev;
} GC;
static GC *curGC;

static void set_color (Color* cp)
{
    int    i;
    char   buffer[32];

    if (eqColor(cp,&curGC->color)) return;
    for(i=0;i<ColorsUsed;i++) {
      if (eqColor(cp,&colorlist[i])) break;
    }
    if (i == ColorsUsed) {
      if(ColorsUsed == NPENS) i--;
      else ColorsUsed++;
      sprintf(buffer,"PC%d,%d,%d,%d%s", i, cp->r, cp->g, cp->b, Sep);
      colorlist[i] = *cp;
      output(buffer);
#ifdef HPDEBUG
  fprintf(stderr, "set pen %d color %d %d %d\n", i, cp->r, cp->g, cp->b);
#endif
    }
    setPen(i);
    curGC->color = *cp;
}

static void initColors (void)
{
  colorlist = N_GNEW(NPENS,Color);
  colorlist[0] = white;
  colorlist[1] = black;
  ColorsUsed = 2;
}

static void destroyColors (void)
{
  free (colorlist);
  ColorsUsed = 0;
} 

static void setFont(FontInfo* fi)
{
  int    otherfont;
  char   buffer[128];

  if (eqFontInfo(fi,&fontState.fonts[fontState.curfont])) return;
  otherfont = (fontState.curfont?0:1);
  
  if (!eqFontInfo(fi,&fontState.fonts[otherfont])) {
    if (fi->spacing)
      sprintf(buffer,"%s1,%d,2,1,4,%.1f,5,%d,6,%d,7,%d%s",
        (otherfont?"AD":"SD"),fi->symbol,
        Scale*(fi->size),fi->italic,fi->bold,fi->face,Sep);
    else
      sprintf(buffer,"%s1,%d,2,0,3,%.1f,5,%d,6,%d,7,%d%s",
        (otherfont?"AD":"SD"),fi->symbol,
        (fi->size)/Scale,fi->italic,fi->bold,fi->face,Sep);
    output(buffer);
  }
  sprintf(buffer,"%s%s\n",(otherfont?"SA":"SS"), Sep); 
  output(buffer);
  fontState.curfont = otherfont;
  fontState.fonts[otherfont] = *fi;
  curGC->font = *fi;
}

static void set_line_bold (int on)
{
  char   buffer[32];

  if (on) {
    sprintf(buffer,"PW%.3f%s\n", 2*PENW, Sep);
    curGC->bold = TRUE;
  }
  else {
    sprintf(buffer,"PW%.3f%s\n", PENW, Sep);
    curGC->bold = FALSE;
  }
  output(buffer);
}

static void set_line_style(int sty)
{
  char   buffer[8];
  char   *opt = NULL;

  curGC->style = sty;
  switch(sty) {
    case SOLID  : opt = "LT"; break;
    case DOTTED : opt = "LT1"; break;
    case DASHED : opt = "LT2"; break;
    case INVIS  :
    default: return;
  }
  sprintf(buffer, "%s%s", opt, Sep); 
  output (buffer);
}

static GC *makeGC(GC* old)
{
  GC    *newGC;
  newGC = GNEW(GC);
  if (old) *newGC = *old;
  else {
    newGC->bold = FALSE,
    newGC->style = SOLID,
    newGC->color = black;
    newGC->font = dfltFont;
  }
  newGC->prev = 0;
  return newGC;
}

static void initGC(void)
{
  char   buffer[32];

  curGC = makeGC(0);
      /* Pick pen 1; set default pen width; set colors
       */ 
  sprintf(buffer,"SP1%sPW%.3f%s\n", Sep, PENW, Sep); 
  output(buffer);
  fontState.curfont = 1;
  setFont(&dfltFont);
  CurrentPen = 1;
  initColors();
}

static void destroyGC(void)
{
  GC *gc, *gc1;
  for(gc = curGC;gc;gc=gc1) {
    gc1 = gc->prev;
    free(gc);
  }
  curGC = 0;
  fontState.fonts[0] = nullFont;
  fontState.fonts[1] = nullFont;
  fontState.curfont = 1;
  destroyColors();
}

static void saveGC(void)
{
  GC    *newGC;
  newGC = makeGC(curGC);
  newGC->prev = curGC;
  curGC = newGC;
}

static void restoreGC(void)
{
  GC    *gc, *newGC;
  gc = curGC;
  newGC = gc->prev;
  if (gc->bold != newGC->bold) set_line_bold(newGC->bold);
  if (gc->style != newGC->style) set_line_style(newGC->style);
  if (!eqColor(&gc->color, &newGC->color)) {
#ifdef HPDEBUG
    fprintf(stderr, "restore color\n");
#endif
    set_color(&newGC->color);
  }
  if (!eqFontInfo(&gc->font,&newGC->font)) setFont(&newGC->font);
  free(gc);
  curGC = newGC;
}

static int isInvis(void)
{
  return(curGC->style == INVIS);
}

#if 0 /* not used */
static double _Xalign;
#define getTextAlign() (_Xalign)
static void
initTextAlign (void)
{
  char buffer[20];
  _Xalign = -0.5;
  sprintf(buffer,"LO4%s",Sep);
  output(buffer);
}

static int
setTextAlign (double al)
{
  char buffer[20];
  char opt;

  if (al == 0.0) opt = '1';
  else if (al == -1.0) opt = '7';
  else if (al == -0.5) opt = '4';
  else return 0;

  sprintf(buffer,"LO%c%s",opt,Sep);
  output(buffer);
  _Xalign = al;
  return 1;
}
#endif

static void
hpgl_reset(void)
{
	/* onetime = TRUE; */
}

static void
hpgl_begin_job(FILE *ofp, graph_t *g, char **lib, char *user, char *info[], point pages)
{
	/* Pages = pages; */
	N_pages = pages.x * pages.y;
}

static  void hpgl_end_job(void) { }

static void
hpgl_begin_graph(graph_t* g, box bb, point pb)
{
    PB = bb;
    PageWidth = pb.x;
    if (Output_lang == PCL) {
      prefix = pcl_prefix;
      suffix = pcl_suffix;
    }
    else {
      prefix = raw_prefix;
      suffix = raw_suffix;
    }
}

static void hpgl_end_graph(void) { }

static void hpgl_set_scale (double scx,double scy)
{
    char   buffer[64];
	sprintf(buffer,"SC%.4f,%.4f,%.4f,%.4f,2%s\n",
      -Origin.x/scx, PT2UNIT(scx), -Origin.y/scy, PT2UNIT(scy), Sep); 
    output(buffer);
}

static void hpgl_begin_page(graph_t *g, point page, double scale, int rot, point offset)
{
    char   buffer[64];
    box    clipWin;

    bufcnt = 0;
    Scale = scale;

      /* Initialize output */
    output(prefix);
    sprintf(buffer,"BP%sIN%s", Sep, Sep); output(buffer);
#ifdef SMILE
    doSmile();
#endif
#if 0 /* not used */
    initTextAlign();
#endif
    initGC();

    if (N_pages > 1) {
      saveGC();
      setFont(&coordFont);
      if (rot == 90) {
        sprintf(buffer,"RO90IP%s", Sep);
        output(buffer);
      }
      sprintf(buffer,"PA0,0%sLB(%d,%d)\03%s\n", Sep, page.x, page.y, Sep);
      output(buffer);
      if (rot == 90) {
        sprintf(buffer,"ROIP%s", Sep);
        output(buffer);
      }
      restoreGC();
    }

    if (rot == 90) {
        /* Rotate layout. HPGL/2 automatically shifts
         * origin to bottom right corner, so we have to
         * use the page width to set the new origin.
         */
      sprintf(buffer,"RO90IP%s", Sep); 
      output(buffer);

      clipWin.LL.x = PB.LL.y-HP_OY-1;
      clipWin.LL.y = PageWidth-PB.UR.x-HP_OX-1;
      clipWin.UR.x = PB.UR.y-HP_OY+1;
      clipWin.UR.y = PageWidth-PB.LL.x-HP_OX+1;
      Origin.x = PB.LL.y + scale*offset.y - HP_OY;
      Origin.y = PageWidth - PB.LL.x - scale*offset.x - HP_OX;
    } 
    else {
      clipWin.LL.x = PB.LL.x-HP_OX-1;
      clipWin.LL.y = PB.LL.y-HP_OY-1;
      clipWin.UR.x = PB.UR.x-HP_OX+1;
      clipWin.UR.y = PB.UR.y-HP_OY+1;
      Origin.x = PB.LL.x + scale*offset.x - HP_OX;
      Origin.y = PB.LL.y + scale*offset.y - HP_OY;
    }
        /* Set clipping window */
      sprintf(buffer,"IW%d,%d,%d,%d%s\n", 
        (int)PT2UNIT(clipWin.LL.x), (int)PT2UNIT(clipWin.LL.y),
        (int)PT2UNIT(clipWin.UR.x), (int)PT2UNIT(clipWin.UR.y), Sep);
      /* output(buffer); */   /* Turn off clipping. */
      hpgl_set_scale(scale,scale);

}

static void hpgl_end_page(void)
{
    char   buffer[32];

	sprintf(buffer,"PU%sSP0%sPG;\n", Sep, Sep); /* pen up; advance page */
    output(buffer);
    output(suffix);
    destroyGC();
}

static void hpgl_begin_cluster(graph_t* g) { }

static void hpgl_end_cluster (void) { }

static void hpgl_begin_nodes(void) { }
    
static void hpgl_end_nodes(void) { }

static void hpgl_begin_edges(void) { }            

static void hpgl_end_edges(void) { }            

static void hpgl_begin_node(node_t* n) { }

static void hpgl_end_node (void) { }

static void hpgl_begin_edge (edge_t* e) { }

static void hpgl_end_edge (void) { }

static void hpgl_begin_context(void)
{
	saveGC();
}

static void hpgl_end_context(void)
{
	restoreGC();
}

static void mkFontCanon (char *old, char *new)
{
  char      c;
  while ((c = *old++)) {
    if (isalnum(c) == FALSE) continue;
    if (isupper(c)) c = tolower(c);
    *new++ = c;
  }
  *new = c;
}

  /* factors for turning font size, in points,
   * to pitches, in chars per inch, for fixed pitch fonts.
   */
static double courierPitch = 110.76923;
static double stickPitch = 102.85714;

typedef struct {
  char      *name;
  int       symbol;
  double    *spacing;
  int       face;
  int       italic;
  int       bold;
} FontIndex;
static FontIndex fontIndex[] = {
  { "timesroman", 277, 0, 5, 0, 0 },
  { "timesbold", 277, 0, 5, 0, 3 },
  { "timesitalic", 277, 0, 5, 1, 0 },
  { "timesbolditalic", 277, 0, 5, 1, 3 },
  { "helvetica", 277, 0, 4, 0, 0 },
  { "helveticabold", 277, 0, 4, 0, 3 },
  { "helveticaoblique", 277, 0, 4, 1, 0 },
  { "helveticaboldoblique", 277, 0, 4, 1, 3 },
  { "courier", 277, &courierPitch, 3, 0, 0 },
  { "courierbold", 277, &courierPitch, 3, 0, 3 },
  { "courieroblique", 277, &courierPitch, 3, 1, 0 },
  { "courierboldoblique", 277, &courierPitch, 3, 1, 3 },
  { "palatinoroman", 277, 0, 15, 0, 0 },
  { "palatinobold", 277, 0, 15, 0, 3 },
  { "palatinoitalic", 277, 0, 15, 1, 0 },
  { "palatinobolditalic", 277, 0, 15, 1, 3 },
  { "stickcw", 277, &stickPitch, 48, 0, 0 },
  { "stick", 277, 0, 48, 0, 0 },
  { "zapfdingbats", 332, 0, 45, 0, 0 },
  { "symbol", 173, 0, 5, 0, 0 }
};

static void mkFontInfo(char* name, double size, FontInfo* fip)
{
  int       i;
  char      buf[128];
  FontIndex *fi;

  mkFontCanon(name,buf);
  fi = fontIndex;
  for(i=0;i<sizeof(fontIndex)/sizeof(FontIndex)-1;i++) {
    if (streq(buf,fi->name)) break;
    fi++;
  }
  fip->symbol = fi->symbol;
  fip->italic = fi->italic;
  fip->bold = fi->bold;
  fip->face = fi->face;
  if (fi->spacing) { /* fixed spacing */
    fip->spacing = 0;
    fip->size = (*(fi->spacing))/size;
  }
  else {  /* proportional spacing */
    fip->spacing = 1;
    fip->size = size;
  }
}

static void hpgl_set_font(char* name, double size)
{
    static FontInfo fi;

    mkFontInfo(name,size,&fi);
    setFont(&fi);
}

static void hpgl_set_color(char* name)
{
    color_t color;

#ifdef HPDEBUG
    fprintf (stderr, "set color %s\n", name);
#endif
    colorxlate(name,&color,RGBA_BYTE);
    set_color ((Color *)color.u.rgba);
}

static void hpgl_set_style(char** s)
{
	char	*line;

	while ((line = *s++)) {
		if (streq(line,"solid")) set_line_style (SOLID);
		else if (streq(line,"dashed")) set_line_style (DASHED);
		else if (streq(line,"dotted")) set_line_style (DOTTED);
		else if (streq(line,"invis")) set_line_style (INVIS);
		else if (streq(line,"bold")) set_line_bold (TRUE);
		else if (streq(line,"filled")) { /* no-op */ }
		else if (streq(line,"unfilled")) { /* no-op */ }
		else {
            agerr(AGERR, "hpgl_set_style: unsupported style %s - ignoring\n",
                line); 
        }
	}
}

static void hpgl_textline(point p, textline_t *line)
{
    char   buffer[128];
    char   *str = line->str;

    if (isInvis()) return;

    switch(line->just) {
	case 'l':
	    break;
	case 'r':
	    p.x -= line->width;
	    break;
	default:
	case 'n':
	    p.x -= line->width / 2;
	    break;
    }

    sprintf(buffer,"PA%d,%d%s",CX(p.x),CY(p.y), Sep);
    output(buffer);
    output_text(str);

#ifdef HPDEBUG
  fprintf(stderr, "text =%s=\n", str);
#endif
}

static int firstSeg;
#define FLATNESS  1.0
static int isFlat (double x0, double y0, double x1, double y1, double x2, double y2, double x3, double y3) 
{
    double sa, ca, y, O = y3 - y0, A = x3 - x0, H = sqrt (O*O + A*A);

    if (H == 0)
        return TRUE;

    sa = O / H, ca = A / H;
    y = - sa * (x1 - x0) + ca * (y1 - y0);
    if (y > FLATNESS || y < -FLATNESS)
        return FALSE;
    y =  - sa * (x2 - x0) + ca * (y2 - y0);
    return y <= FLATNESS && y >= -FLATNESS;
}

static void Bzier (double x0, double y0, double x1, double y1, double x2, double y2, double x3, double y3)
{
  char   buffer[64];
  if (isFlat(x0, y0, x1, y1, x2, y2, x3, y3)) {
    if(firstSeg) {
      sprintf(buffer,"%d,%d",CX(x3),CY(y3));
      firstSeg = 0;
    }
    else {
      sprintf(buffer,",%d,%d",CX(x3),CY(y3));
    }
    output(buffer);
    return;
  }
  Bzier  (x0,                                 y0,
         (x0 + x1) / 2,                      (y0 + y1) / 2,
         (x0 + x2) / 4 + x1 / 2,             (y0 + y2) / 4 + y1 / 2,
         (x0 + x3) / 8 + 3 * (x1 + x2) / 8,  (y0 + y3) / 8 + 3 * (y1 + y2) / 8);
  Bzier ((x0 + x3) / 8 + 3 * (x1 + x2) / 8,  (y0 + y3) / 8 + 3 * (y1 + y2) / 8,
         (x1 + x3) / 4 + x2 / 2,             (y1 + y3) / 4 + y2 / 2,
         (x2 + x3) / 2,                      (y2 + y3) / 2,
          x3,                                 y3);

}

static void hpgl_bezier(point *A, int n, int arrow_at_start, int arrow_at_end)
{
    char    buffer[32];
	int		j;

	if (arrow_at_start || arrow_at_end)
		agerr(AGERR, "hpgl_bezier illegal arrow args\n");
    if (isInvis()) return;
	sprintf(buffer,"PA%d,%d%sPD",CX(A[0].x),CY(A[0].y), Sep);
    output(buffer);
    firstSeg = 1;
	for (j = 1; j < n; j += 3)
        Bzier((double)A[j-1].x,(double)A[j-1].y, 
               (double)A[j].x,(double)A[j].y,
               (double)A[j+1].x,(double)A[j+1].y,
               (double)A[j+2].x,(double)A[j+2].y);
	sprintf(buffer,"%sPU%s\n", Sep, Sep);
    output(buffer);
}

static void hpgl_polygon(point *A, int n, int filled)
{
	int		j;
    char    buffer[64];

    if (isInvis()) return;
	sprintf(buffer,"PA%d,%d%sPM0%sPD",CX(A[0].x),CY(A[0].y),Sep,Sep);
    output(buffer);
	for (j = 1; j < n-1; j ++) {
      sprintf(buffer,"%d,%d,",CX(A[j].x),CY(A[j].y));
      output(buffer);
    }
	sprintf(buffer,"%d,%d%sPM2%sPU%s",CY(A[n-1].x),CY(A[n-1].y), Sep,Sep,Sep);
    output(buffer);
    if (filled) {
#ifdef HPDEBUG
  fprintf(stderr, "fill pen %d\n", CurrentPen);
#endif
      if (CurrentPen == 1) {
        sprintf(buffer,"FP%sLT%sEP%sLT99%s\n",Sep,Sep,Sep,Sep);
      }
      else {
        sprintf(buffer,"FP%sSP1%sLT%sEP%sSP%d%sLT99%s\n", 
          Sep,Sep,Sep,Sep,CurrentPen,Sep,Sep);
      }
    }
    else {
	  sprintf(buffer, "EP%s\n", Sep);
    }
    output(buffer);
}

/***** Arrowheads now centralized in emit.c
static void hpgl_arrowhead(point p,double theta,double scale,int flag)
{
    point   sp,ep;
    double  costh, sinth,arroww2,arrowl;
    char    buffer[128];

    if (isInvis()) return;
    costh = cos(RADIANS(theta));
    sinth = sin(RADIANS(theta));
	arrowl = ARROW_LENGTH * scale;
	arroww2 = ARROW_WIDTH * scale / 2.0;
    sp.x = p.x + arrowl*costh + arroww2*sinth;
    sp.y = p.y + arrowl*sinth - arroww2*costh;
    ep.x = p.x + arrowl*costh - arroww2*sinth;
    ep.y = p.y + arrowl*sinth + arroww2*costh;
	sprintf(buffer,"PA%d,%d%sPM0%sPD%d,%d,%d,%d%sPM2%sPU%sFP%s\n",
      CX(sp.x),CY(sp.y),Sep,Sep,
      CX(p.x),CY(p.y),CX(ep.x),CY(ep.y), Sep, Sep, Sep, Sep);
    output(buffer);
}
**********/

static void hpgl_ellipse(point p,int rx,int ry,int filled)
{
    char    buffer[128];

    if (isInvis()) return;
	sprintf(buffer,"PA%d,%d%s",p.x,p.y,Sep);
    output(buffer);
	hpgl_set_scale(Scale*rx,Scale*ry);
    if (filled) {
	  if (CurrentPen == 1) 
        sprintf(buffer,"WG1,0,360%sLT%sEW1,0,360%sLT99%s",Sep,Sep,Sep,Sep);
	  else 
        sprintf(buffer,"WG1,0,360%sSP1%sLT%sEW1,0,360%sSP%d%sLT99%s",
          Sep,Sep,Sep,Sep,CurrentPen,Sep,Sep);
    }
    else sprintf(buffer,"EW1,0,360%s", Sep);
    output(buffer);
	hpgl_set_scale(Scale,Scale);
}

/* Use encoded form */
static void hpgl_polyline(point* A, int n)
{
	int		j;
    char    buffer[64];

    if (isInvis()) return;
	sprintf(buffer,"PA%d,%d%sPD",CX(A[0].x),CY(A[0].y), Sep);
    output(buffer);
	for (j = 1; j < n-1; j ++) {
      sprintf(buffer,"%d,%d,",CX(A[j].x),CY(A[j].y));
      output(buffer);
    }
	sprintf(buffer,"%d,%d%sPU%s\n",CX(A[n-1].x),CY(A[n-1].y),Sep,Sep);
    output(buffer);
}

static void hpgl_user_shape(char *name, point *A, int n, int filled)
{
	static boolean onetime = TRUE;
	if (onetime) {
		agerr(AGERR, "custom shapes not available with this driver\n");
		onetime = FALSE;
	}
}

codegen_t	HPGL_CodeGen = {
	hpgl_reset,
	hpgl_begin_job, hpgl_end_job,
	hpgl_begin_graph, hpgl_end_graph,
	hpgl_begin_page, hpgl_end_page,
	hpgl_begin_cluster, hpgl_end_cluster,
	hpgl_begin_nodes, hpgl_end_nodes,
	hpgl_begin_edges, hpgl_end_edges,
	hpgl_begin_node, hpgl_end_node,
	hpgl_begin_edge, hpgl_end_edge,
	hpgl_begin_context, hpgl_end_context,
	hpgl_set_font, hpgl_textline,
	hpgl_set_color, hpgl_set_color, hpgl_set_style,
	hpgl_ellipse, hpgl_polygon,
	hpgl_bezier, hpgl_polyline,
	0 /* hpgl_arrowhead */, hpgl_user_shape,
	0 /* hpgl_comment */, 0 /* hpgl_textsize */
};