diagen.c   [plain text]

/*
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

#include	<stdarg.h>
#include	"render.h"
#include "utils.h"

#ifdef HAVE_LIBZ
#include	"zlib.h"
#ifdef MSWIN32
#include <io.h>
#endif
#endif

#ifdef DMALLOC
#include "dmalloc.h"
#endif

/* DIA font modifiers */
#define REGULAR 0
#define BOLD	1
#define ITALIC	2

/* DIA patterns */
#define P_SOLID	0
#define P_NONE  15
#define P_DOTTED 4	/* i wasn't sure about this */
#define P_DASHED 11 /* or this */

/* DIA bold line constant */
#define WIDTH_NORMAL 1
#define WIDTH_BOLD 3

#define DIA_RESOLUTION 1.0
#define SCALE (DIA_RESOLUTION/15.0)

#define		NODE		1
#define		EDGE		2
#define		CLST		3


/* FIXME - these are not used currently - probably something missing */
#if 0
/* DIA dash array */
static char * sdarray = "5,2";
/* DIA dot array */
static char * sdotarray = "1,5";
static int		GraphURL, ClusterURL, NodeURL, EdgeURL;
static char             *op[] = {"graph", "node", "edge", "graph"};
#endif

/* static	int		N_pages; */
/* static 	point	Pages; */
static	double	Scale;
static	pointf	Offset;
static	int		Rot;
static	box		PB;
static int		onetime = TRUE;

static node_t		*Curnode;
static edge_t		*Curedge;
static graph_t		*Curgraph, *Rootgraph;

typedef struct context_t {
	char 	*pencolor,*fillcolor,*fontfam,fontopt,font_was_set;
	char	pen,fill,penwidth,style_was_set;
	double	fontsz;
} context_t;

#define MAXNEST 4
static context_t cstk[MAXNEST];
static int SP;

#ifdef HAVE_LIBZ
static gzFile Zfile;
#endif

static int dia_fputs (char *s)
{
	int len;

	len = strlen(s);

#ifdef HAVE_LIBZ
	return gzwrite(Zfile,s,(unsigned)len);
#else
	return 0;
#endif
}


/* dia_printf:
 * Note that this function is unsafe due to the fixed buffer size.
 * It should only be used when the caller is sure the input will not
 * overflow the buffer. In particular, it should be avoided for
 * input coming from users. Also, if vsnprintf is available, the
 * code should check for return values to use it safely.
 */
static int
dia_printf(const char *format, ...)
{
	char buf[BUFSIZ];
	va_list argp;
	int len;

	va_start(argp, format);
#ifdef HAVE_VSNPRINTF
	(void)vsnprintf(buf, sizeof(buf), format, argp);
#else
	(void)vsprintf(buf, format, argp);
#endif
	va_end(argp);
	len = strlen(buf);		

				/* some *sprintf (e.g C99 std)
				   	don't return the number of
				   	bytes actually written */

#ifdef HAVE_LIBZ
	return gzwrite(Zfile,buf,(unsigned)len);
#else
	return 0;
#endif
}


static void
dia_reset(void)
{
	onetime = TRUE;
}


static void
init_dia(void)
{
	SP = 0;
	cstk[0].pencolor = DEFAULT_COLOR;	/* DIA pencolor */
	cstk[0].fillcolor = "";			/* DIA fillcolor */
	cstk[0].fontfam = DEFAULT_FONTNAME;	/* font family name */
	cstk[0].fontsz = DEFAULT_FONTSIZE;	/* font size */
	cstk[0].fontopt = REGULAR;		/* modifier: REGULAR, BOLD or ITALIC */
	cstk[0].pen = P_SOLID;			/* pen pattern style, default is solid */
	cstk[0].fill = P_NONE;
	cstk[0].penwidth = WIDTH_NORMAL;
}

static pointf
diapt(point p)
{
	pointf	rv;

	if (Rot == 0) {
		rv.x = PB.LL.x + p.x * Scale + Offset.x;
		rv.y = PB.UR.y - 1 - p.y * Scale - Offset.y;
	} else {
		rv.x = PB.UR.x - 1 - p.y * Scale - Offset.x;
		rv.y = PB.UR.y - 1 - p.x * Scale - Offset.y;
	}
	return rv;
}

static char*
dia_resolve_color(char *name)
{
#ifdef DIA_KNOWS_SVG_COLORNAMES
/* color names from http://www.w3.org/TR/SVG/types.html */
	static char *known_colors[] = {
"aliceblue", "antiquewhite", "aqua", "aquamarine", "azure",
"beige", "bisque", "black", "blanchedalmond", "blue",
    "blueviolet", "brown", "burlywood",
"cadetblue", "chartreuse", "chocolate", "coral", "cornflowerblue",
    "cornsilk", "crimson", "cyan",
"darkblue", "darkcyan", "darkgoldenrod", "darkgray", "darkgreen",
    "darkgrey", "darkkhaki", "darkmagenta", "darkolivegreen",
    "darkorange", "darkorchid", "darkred", "darksalmon",
    "darkseagreen", "darkslateblue", "darkslategray",
    "darkslategrey", "darkturquoise", "darkviolet", "deeppink",
    "deepskyblue", "dimgray", "dimgrey", "dodgerblue",
"firebrick", "floralwhite", "forestgreen", "fuchsia",
"gainsboro", "ghostwhite", "gold", "goldenrod", "gray", "green",
    "greenyellow", "grey",
"honeydew", "hotpink", "indianred",
"indigo", "ivory", "khaki",
"lavender", "lavenderblush", "lawngreen", "lemonchiffon",
    "lightblue", "lightcoral", "lightcyan", "lightgoldenrodyellow",
    "lightgray", "lightgreen", "lightgrey", "lightpink",
    "lightsalmon", "lightseagreen", "lightskyblue",
    "lightslategray", "lightslategrey", "lightsteelblue",
    "lightyellow", "lime", "limegreen", "linen",
"magenta", "maroon", "mediumaquamarine", "mediumblue",
    "mediumorchid", "mediumpurple", "mediumseagreen",
    "mediumslateblue", "mediumspringgreen", "mediumturquoise",
    "mediumvioletred", "midnightblue", "mintcream",
    "mistyrose", "moccasin",
"navajowhite", "navy", "oldlace",
"olive", "olivedrab", "orange", "orangered", "orchid",
"palegoldenrod", "palegreen", "paleturquoise",
    "palevioletred", "papayawhip", "peachpuff", "peru", "pink",
    "plum", "powderblue", "purple",
"red", "rosybrown", "royalblue",
"saddlebrown", "salmon", "sandybrown", "seagreen", "seashell",
    "sienna", "silver", "skyblue", "slateblue", "slategray",
    "slategrey", "snow", "springgreen", "steelblue",
"tan", "teal", "thistle", "tomato", "turquoise",
"violet",
"wheat", "white", "whitesmoke",
"yellow", "yellowgreen",
0};
#else
	static char *known_colors[] = {0};
#endif
        static char buf[SMALLBUF];
	char *tok, **known;
	color_t	color;
	
	tok = canontoken(name);
	for (known = known_colors; *known; known++)
		if (streq(tok,*known)) break;
	if (*known == 0) {
		if (streq(tok,"transparent")) {
			tok = "none";
		}
		else {
			colorxlate(name,&color,RGBA_BYTE);
			sprintf(buf,"#%02x%02x%02x",
				color.u.rgba[0],
				color.u.rgba[1],
				color.u.rgba[2]);
			tok = buf;
		}
	}
	return tok;
}

static void
dia_grstyle(context_t* cp)
{
	if (cp->pencolor!=DEFAULT_COLOR) {
		dia_fputs("      <dia:attribute name=\"border_color\">\n");
		dia_printf("        <dia:color val=\"%s\"/>\n",dia_resolve_color(cp->pencolor));
		dia_fputs("      </dia:attribute>\n");
	}
	if (cp->penwidth!=WIDTH_NORMAL) {
		dia_fputs("      <dia:attribute name=\"line_width\">\n");
		dia_printf("        <dia:real val=\"%g\"/>\n",Scale*(cp->penwidth));
		dia_fputs("      </dia:attribute>\n");
	}
	if (cp->pen == P_DASHED ) {
		dia_fputs("      <dia:attribute name=\"line_style\">\n");
		dia_printf("        <dia:real val=\"%d\"/>\n",1);
		dia_fputs("      </dia:attribute>\n");
	}
#if 0
	} else if( cp->pen == P_DOTTED) {
		dia_printf("stroke-dasharray:%s;", sdotarray);
	}
#endif
}

static void
dia_grstylefill(context_t* cp, int filled)
{
	if (filled) {
		dia_fputs("      <dia:attribute name=\"inner_color\">\n");
		dia_printf("        <dia:color val=\"%s\"/>\n",dia_resolve_color(cp->fillcolor));
		dia_fputs("      </dia:attribute>\n");
	}
	else {
		dia_fputs("      <dia:attribute name=\"show_background\">\n");
		dia_printf("        <dia:boolean val=\"%s\"/>\n","true");
		dia_fputs("      </dia:attribute>\n");
	}
}

static void
dia_comment(void* obj, attrsym_t* sym)
{
	char	*str = late_string(obj,sym,"");
	if (str[0]) {
		dia_fputs ("<!-- ");
		/* FIXME - should check for --> sequences in str */
		dia_fputs (str);
		dia_fputs (" -->\n");
	}
}

static void
dia_begin_job(FILE *ofp, graph_t *g, char **lib, char *user, char *info[], point pages)
{
#if HAVE_LIBZ
	int	fd;

	fd = dup(fileno(Output_file)); /* open dup so can gzclose 
			     independent of FILE close */
#ifdef HAVE_SETMODE
#ifdef O_BINARY
	/*
 	* Windows will do \n -> \r\n  translations on
 	* stdout unless told otherwise.
 	*/
	setmode(fd, O_BINARY);
#endif
#endif


	Zfile = gzdopen(fd, "wb");
	if (!Zfile) {
		agerr (AGERR, "Error opening compressed output file\n");
		exit(1);
	}
#else
	agerr(AGERR, "No support for compressed output. Not compiled with zlib.\n");
	exit(1);
#endif

/*	Pages = pages; */
/*	N_pages = pages.x * pages.y; */
	dia_printf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");

}

static  void
dia_end_job(void)
{
}

static void
dia_begin_graph(graph_t* g, box bb, point pb)
{
	Rootgraph = g;
        PB.LL.x = PB.LL.y = 0;
        PB.UR.x = (bb.UR.x - bb.LL.x + 2*GD_drawing(g)->margin.x) * SCALE;
        PB.UR.y = (bb.UR.y - bb.LL.y + 2*GD_drawing(g)->margin.y) * SCALE;
        Offset.x = GD_drawing(g)->margin.x * SCALE;
        Offset.y = GD_drawing(g)->margin.y * SCALE;
	if (onetime) {
		init_dia();
		dia_comment(g,agfindattr(g,"comment"));
		onetime = FALSE;
	}
	dia_fputs("<dia:diagram xmlns:dia=\"http://www.lysator.liu.se/~alla/dia/\">\n");
	dia_fputs("  <dia:diagramdata>\n");
	dia_fputs("    <dia:attribute name=\"background\">\n");
	dia_fputs("      <dia:color val=\"#ffffff\"/>\n");
	dia_fputs("    </dia:attribute>\n");
	dia_fputs("    <dia:attribute name=\"paper\">\n");
	dia_fputs("      <dia:composite type=\"paper\">\n");
	dia_fputs("        <dia:attribute name=\"name\">\n");
	dia_fputs("          <dia:string>#A4#</dia:string>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"tmargin\">\n");
	dia_fputs("          <dia:real val=\"2.8222\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"bmargin\">\n");
	dia_fputs("          <dia:real val=\"2.8222\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"lmargin\">\n");
	dia_fputs("          <dia:real val=\"2.8222\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"rmargin\">\n");
	dia_fputs("          <dia:real val=\"2.8222\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"is_portrait\">\n");
	dia_fputs("          <dia:boolean val=\"true\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"scaling\">\n");
	dia_fputs("          <dia:real val=\"1\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"fitto\">\n");
	dia_fputs("          <dia:boolean val=\"false\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("      </dia:composite>\n");
	dia_fputs("    </dia:attribute>\n");
	dia_fputs("    <dia:attribute name=\"grid\">\n");
	dia_fputs("      <dia:composite type=\"grid\">\n");
	dia_fputs("        <dia:attribute name=\"width_x\">\n");
	dia_fputs("          <dia:real val=\"1\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"width_y\">\n");
	dia_fputs("          <dia:real val=\"1\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"visible_x\">\n");
	dia_fputs("          <dia:int val=\"1\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("        <dia:attribute name=\"visible_y\">\n");
	dia_fputs("          <dia:int val=\"1\"/>\n");
	dia_fputs("        </dia:attribute>\n");
	dia_fputs("      </dia:composite>\n");
	dia_fputs("    </dia:attribute>\n");
	dia_fputs("    <dia:attribute name=\"guides\">\n");
	dia_fputs("      <dia:composite type=\"guides\">\n");
	dia_fputs("        <dia:attribute name=\"hguides\"/>\n");
	dia_fputs("        <dia:attribute name=\"vguides\"/>\n");
	dia_fputs("      </dia:composite>\n");
	dia_fputs("    </dia:attribute>\n");
	dia_fputs("  </dia:diagramdata>\n");
}

static void
dia_end_graph(void)
{
	dia_printf("</dia:diagram>\n");
#ifdef HAVE_LIBZ
	gzclose(Zfile);
#endif
}

static void
dia_begin_page(graph_t *g, point page, double scale, int rot, point offset)
{
	/* int		page_number; */
	/* point	sz; */

	Scale = scale * SCALE;
	Rot = rot;
	/* page_number =  page.x + page.y * Pages.x + 1; */
	/* sz = sub_points(PB.UR,PB.LL); */

	dia_printf("  <dia:layer name=\"Background\" visible=\"true\">\n");
}

static  void
dia_end_page(void)
{
	dia_fputs("  </dia:layer>\n");
}

static  void
dia_begin_cluster(graph_t* g)
{
	dia_printf("<dia:group>\n");
	Curgraph = g;
}

static  void
dia_end_cluster (void)
{
	dia_printf("</dia:group>\n");
}

static void
dia_begin_node(node_t* n)
{
	dia_printf("<dia:group>\n");
	Curnode = n;
}

static  void
dia_end_node (void)
{
	dia_printf("</dia:group>\n");
}

static  void
dia_begin_edge (edge_t* e)
{
	Curedge = e;
}

static  void
dia_end_edge (void)
{
}

static  void
dia_begin_context(void)
{
	assert(SP + 1 < MAXNEST);
	cstk[SP+1] = cstk[SP];
	SP++;
}

static  void 
dia_end_context(void)
{
	int			psp = SP - 1;
	assert(SP > 0);
	/*free(cstk[psp].fontfam);*/
	SP = psp;
}

static void 
dia_set_font(char* name, double size)
{
	char	*p;
	context_t	*cp;

	cp = &(cstk[SP]);
	cp->font_was_set = TRUE;
	cp->fontsz = size;
	p = strdup(name);
	cp->fontfam = p;
}

static  void
dia_set_pencolor(char* name)
{
	cstk[SP].pencolor = name;
}

static  void
dia_set_fillcolor(char* name)
{
	cstk[SP].fillcolor = name;
}

static  void
dia_set_style(char** s)
{
	char		*line, *p;
	context_t	*cp;

	cp = &(cstk[SP]);
	while ((p = line = *s++)) {
		if (streq(line,"solid")) cp->pen = P_SOLID;
		else if (streq(line,"dashed")) cp->pen = P_DASHED;
		else if (streq(line,"dotted")) cp->pen = P_DOTTED;
		else if (streq(line,"invis")) cp->pen = P_NONE;
		else if (streq(line,"bold")) cp->penwidth = WIDTH_BOLD;
		else if (streq(line, "setlinewidth")) {
			while (*p) p++; p++; 
			cp->penwidth = atol(p);
		}
		else if (streq(line,"filled")) cp->fill = P_SOLID;
		else if (streq(line,"unfilled")) cp->fill = P_NONE;
		else {
            agerr (AGWARN, "dia_set_style: unsupported style %s - ignoring\n",
                line); 
        }
		cp->style_was_set = TRUE;
	}
	/* if (cp->style_was_set) dia_style(cp); */
}

static void
dia_textline(point p, textline_t *line)
{
	int	anchor;
	char	*string;
	pointf	mp;
	context_t *cp;

	string = xml_string(line->str);
	if (strlen(string) == 0) {
		/* its zero length, don't draw */
		return;
	}
	cp = &(cstk[SP]);
	if( cp->pen == P_NONE ) {
		/* its invisible, don't draw */
		return;
	}
        switch(line->just) {
                case 'l':
                        anchor=0;
			break;
		case 'r':
                        anchor=2;
			break;
		default:
		case 'n':
                        anchor=1;
			break;
	}

	mp = diapt(p);
	dia_printf("    <dia:object type=\"Standard - Text\" version=\"0\" id=\"%s\">\n","0");
	dia_fputs("      <dia:attribute name=\"text\">\n");
	dia_fputs("        <dia:composite type=\"text\">\n");
	dia_fputs("          <dia:attribute name=\"string\">\n");
	dia_fputs("            <dia:string>#");
	dia_fputs(string);
	dia_fputs("#</dia:string>\n");
	dia_fputs("          </dia:attribute>\n");
	dia_fputs("          <dia:attribute name=\"font\">\n");
	dia_printf("            <dia:font name=\"%s\"/>\n",cp->fontfam);
	dia_fputs("          </dia:attribute>\n");
	dia_fputs("          <dia:attribute name=\"height\">\n");
	dia_printf("            <dia:real val=\"%g\"/>\n",Scale*(cp->fontsz));
	dia_fputs("          </dia:attribute>\n");
	dia_fputs("          <dia:attribute name=\"pos\">\n");
	dia_printf("            <dia:point val=\"%g,%g\"/>\n",mp.x,mp.y);
	dia_fputs("          </dia:attribute>\n");
	dia_fputs("          <dia:attribute name=\"color\">\n");
	dia_printf("            <dia:color val=\"%s\"/>\n",dia_resolve_color(cp->pencolor));
	dia_fputs("          </dia:attribute>\n");
	dia_fputs("          <dia:attribute name=\"alignment\">\n");
	dia_printf("            <dia:enum val=\"%d\"/>\n",anchor);
	dia_fputs("          </dia:attribute>\n");
	dia_fputs("        </dia:composite>\n");
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_pos\">\n");
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",mp.x,mp.y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_bb\">\n");
	dia_printf("        <dia:rectangle val=\"%g,%g;%g,%g\"/>\n",
			mp.x-(Scale*(line->width)/2.),mp.y-0.4,
			mp.x+(Scale*(line->width)/2.),mp.y+0.4);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("    </dia:object>\n");
}

static void
dia_ellipse(point p, int rx, int ry, int filled)
{
	pointf	cp,rp;
	int nodeId;

	switch(Obj) {
		case NODE:
			nodeId = Curnode->id;
			break;
		default:
			nodeId = -1;
			break;
	}	
	
	if( cstk[SP].pen == P_NONE ) {
		/* its invisible, don't draw */
		return;
	}
	cp = diapt(p);

	if (Rot) {int t; t = rx; rx = ry; ry = t;}
	rp.x = Scale * rx;
	rp.y = Scale * ry;

	dia_printf("    <dia:object type=\"Standard - Ellipse\" version=\"0\" id=\"%d\">\n",nodeId);
	dia_fputs("      <dia:attribute name=\"elem_corner\">\n");
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",cp.x-rp.x,cp.y-rp.y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"elem_width\">\n");
	dia_printf("        <dia:real val=\"%g\"/>\n",rp.x+rp.x);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"elem_height\">\n");
	dia_printf("        <dia:real val=\"%g\"/>\n",rp.y+rp.y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_pos\">\n");
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",cp.x-rp.x,cp.y-rp.y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_bb\">\n");
	dia_printf("        <dia:rectangle val=\"%g,%g;%g,%g\"/>\n",
		cp.x-rp.x-.11,cp.y-rp.y-.11,cp.x+rp.x+.11,cp.y+rp.y+.11);
	dia_fputs("      </dia:attribute>\n");
	dia_grstyle(&cstk[SP]);
	dia_grstylefill(&cstk[SP], filled);
	dia_fputs("    </dia:object>\n");
}


int
ellipse_connection(pointf cp, pointf p)
{
	int conn = 0;

	if(cp.x == p.x) {
		if(cp.y > p.y) 
			conn = 1;
		else
			conn = 6;
	} 
	else if (cp.y == p.y) {
		if(cp.x > p.x)
			conn = 3;
		else 
			conn = 4;
	} 
	else if(cp.x < p.x) {
		if(cp.y < p.y)
			conn = 7;
		else 
			conn = 2;
	}
	else if(cp.x > p.x) {
		if(cp.y < p.y)
			conn = 5;
		else
			conn = 0;
	}

	return conn;
}


int
box_connection(node_t *n, pointf p)
{
	int			i=0, j, sides, conn=0, peripheries, z;
	double			xsize, ysize, mindist=0.0, dist;
	polygon_t		*poly;
	pointf			P,*vertices;
	static point	*A;
	static int		A_size;

	poly = (polygon_t*) ND_shape_info(n);
	vertices = poly->vertices;
	sides = poly->sides;
	peripheries = poly->peripheries;
	
	if (A_size < sides) {A_size = sides + 5; A = ALLOC(A_size,A,point);}

	xsize = ((ND_lw_i(n) + ND_rw_i(n)) / ND_width(n)) * 16.0;
	ysize = ((ND_ht_i(n)) / ND_height(n)) * 16.0;

	for (j = 0; j < peripheries; j++) {
		for (i = 0; i < sides; i++) {
			P = vertices[i+j*sides];
/* simple rounding produces random results around .5 
 * this trick should clip off the random part. 
 * (note xsize/ysize prescaled by 16.0 above) */
			A[i].x = ROUND(P.x * xsize) / 16;
			A[i].y = ROUND(P.y * ysize) / 16;
			if (sides > 2) {
				A[i].x += ND_coord_i(n).x;
				A[i].y += ND_coord_i(n).y;
			}
		}
	}

	z = 0;
	while(z < i) {
		dist = DIST(p.x, p.y, diapt(A[z]).x, diapt(A[z]).y);
		if(z == 0) {
			mindist = dist;
			conn = 0;
		}
		if(dist < mindist) {
			mindist = dist;
			conn = 2*z;
		}
		z++;
	}

	z = 0;
	while(z < i) {
		dist = DIST(p.x, p.y, (diapt(A[z]).x + diapt(A[z+1]).x)/2, (diapt(A[z]).y + diapt(A[z+1]).y)/2);
		if(dist < mindist) {
			mindist = dist;
			conn = 2*z + 1;
		}
		z++;
	}

	return conn;
}


static void
dia_bezier(point* A, int n, int arrow_at_start, int arrow_at_end)
{
	int	i, conn_h, conn_t;
	pointf	p,firstp,llp,urp;
	node_t *head, *tail;
	char	*shape_t;
	pointf	cp_h, cp_t;

	conn_h = conn_t = -1;

	head = Curedge->head;
	tail = Curedge->tail;

	shape_t = ND_shape(tail)->name;

	if( cstk[SP].pen == P_NONE ) {
		/* its invisible, don't draw */
		return;
	}

	dia_printf("    <dia:object type=\"Standard - BezierLine\" version=\"0\" id=\"%s\">\n","00");
	dia_fputs("       <dia:attribute name=\"bez_points\">\n");
	for (i = 0; i < n; i++) {
		p = diapt(A[i]);
		if (!i) llp = urp = firstp = p;
		if (p.x < llp.x || p.y < llp.y) llp = p;
		if (p.x > urp.x || p.y > urp.y) urp = p;
		dia_printf("        <dia:point val=\"%g,%g\"/>\n",p.x,p.y);
	}
	dia_fputs("      </dia:attribute>\n");
	dia_grstyle(&cstk[SP]);
	dia_fputs("      <dia:attribute name=\"obj_pos\">\n");
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",firstp.x,firstp.y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_bb\">\n");
	dia_printf("        <dia:rectangle val=\"%g,%g;%g,%g\"/>\n",
			llp.x-.11,llp.y-.11,urp.x+.11,urp.y+.11);
	dia_fputs("      </dia:attribute>\n");

	// arrowheads
	if(arrow_at_start) {
		dia_fputs("      <dia:attribute name=\"start_arrow\">\n");
		dia_fputs("          <dia:enum val=\"3\"/>\n");
		dia_fputs("      </dia:attribute>\n");
		dia_fputs("      <dia:attribute name=\"start_arrow_length\">\n");
		dia_fputs("      	<dia:real val=\"0.8\"/>\n");
		dia_fputs("      </dia:attribute>\n");
		dia_fputs("		 <dia:attribute name=\"start_arrow_width\">\n");
		dia_fputs("			<dia:real val=\"0.8\"/>\n");
		dia_fputs("      </dia:attribute>\n");
	}
	if(arrow_at_end) {
		dia_fputs("      <dia:attribute name=\"end_arrow\">\n");
		dia_fputs("          <dia:enum val=\"3\"/>\n");
		dia_fputs("      </dia:attribute>\n");
		dia_fputs("      <dia:attribute name=\"end_arrow_length\">\n");
		dia_fputs("      	<dia:real val=\"0.8\"/>\n");
		dia_fputs("      </dia:attribute>\n");
		dia_fputs("		 <dia:attribute name=\"end_arrow_width\">\n");
		dia_fputs("			<dia:real val=\"0.8\"/>\n");
		dia_fputs("      </dia:attribute>\n");
	}

	dia_fputs("      <dia:attribute name=\"conn_endpoints\">\n");
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",diapt(A[0]).x,diapt(A[0]).y);
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",diapt(A[n-1]).x,diapt(A[n-1]).y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:connections>\n");

	if((strcmp(shape_t, "ellipse") == 0) || (strcmp(shape_t, "circle") == 0) || (strcmp(shape_t, "doublecircle") == 0)) {
		cp_h = diapt(ND_coord_i(head));
		if(AG_IS_DIRECTED(Rootgraph)) 
			conn_h = ellipse_connection(cp_h, diapt(A[n-1]));
		else 
			conn_h = ellipse_connection(cp_h, diapt(A[0]));
	} 
	else {
		if(AG_IS_DIRECTED(Rootgraph)) 
			conn_h = box_connection(head, diapt(A[n-1]));
		else
			conn_h = box_connection(head, diapt(A[0]));
	}

	if((strcmp(shape_t, "ellipse") == 0) || (strcmp(shape_t, "circle") == 0) || (strcmp(shape_t, "doublecircle") == 0)) {
		cp_t = diapt(ND_coord_i(tail));
		if(AG_IS_DIRECTED(Rootgraph)) 
			conn_t = ellipse_connection(cp_t, diapt(A[0]));
		else 
			conn_t = ellipse_connection(cp_t, diapt(A[n-1]));
	}
	else {
		if(AG_IS_DIRECTED(Rootgraph)) 
			conn_t = box_connection(tail, diapt(A[0]));
		else 
			conn_t = box_connection(tail, diapt(A[n-1]));
	}

	if(arrow_at_start) {
		dia_printf("        <dia:connection handle=\"0\" to=\"%d\" connection=\"%d\"/>\n", head->id, conn_h);
		dia_printf("        <dia:connection handle=\"%d\" to=\"%d\" connection=\"%d\"/>\n", (n-1),tail->id, conn_t);
	}
	else {
		dia_printf("        <dia:connection handle=\"0\" to=\"%d\" connection=\"%d\"/>\n", tail->id, conn_t);
		dia_printf("        <dia:connection handle=\"%d\" to=\"%d\" connection=\"%d\"/>\n", (n-1),head->id, conn_h);
	}

	dia_fputs("      </dia:connections>\n");
	dia_fputs("    </dia:object>\n");
}



static void
dia_polygon(point *A, int n, int filled)
{
	int	i;
	pointf	p, firstp,llp,urp;


	if( cstk[SP].pen == P_NONE ) {
		/* its invisible, don't draw */
		return;
	}
	
	switch(Obj) {
		case NODE:
			dia_printf("    <dia:object type=\"Standard - Polygon\" version=\"0\" id=\"%d\">\n",Curnode->id);
			break;
		case EDGE:
			return;
			break;
		case CLST:
			dia_printf("    <dia:object type=\"Standard - Polygon\" version=\"0\" id=\"%s\">\n",Curgraph->name);
			break;
		default:
			dia_printf("    <dia:object type=\"Standard - Polygon\" version=\"0\" id=\"%s\">\n","polygon");
			break;
	}
	dia_fputs("       <dia:attribute name=\"poly_points\">\n");
	for (i = 0; i < n; i++) {
		p = diapt(A[i]);
		if (!i) llp = urp = firstp = p;
		if (p.x < llp.x || p.y < llp.y) llp = p;
		if (p.x > urp.x || p.y > urp.y) urp = p;
		dia_printf("        <dia:point val=\"%g,%g\"/>\n",p.x,p.y);
	}
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_pos\">\n");
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",firstp.x,firstp.y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_bb\">\n");
	dia_printf("        <dia:rectangle val=\"%g,%g;%g,%g\"/>\n",
			llp.x-.11,llp.y-.11,urp.x+.11,urp.y+.11);
	dia_fputs("      </dia:attribute>\n");
	dia_grstyle(&cstk[SP]);
	dia_grstylefill(&cstk[SP],filled);
	dia_fputs("    </dia:object>\n");
}

static void
dia_polyline(point* A, int n)
{
	int	i;
	pointf	p, firstp,llp,urp;

	if( cstk[SP].pen == P_NONE ) {
		/* its invisible, don't draw */
		return;
	}
	dia_printf("    <dia:object type=\"Standard - PolyLine\" version=\"0\" id=\"%s\">\n","0");
	dia_fputs("      <dia:attribute name=\"poly_points\">\n");
	for (i = 0; i < n; i++) {
		p = diapt(A[i]);
		if (!i) llp = urp = firstp = p;
		if (p.x < llp.x || p.y < llp.y) llp = p;
		if (p.x > urp.x || p.y > urp.y) urp = p;
		dia_printf("<dia:point val=\"%g,%g\"/>\n",p.x,p.y);
	}
	dia_fputs("      </dia:attribute>\n");
	dia_grstyle(&cstk[SP]);
	dia_fputs("      <dia:attribute name=\"obj_pos\">\n");
	dia_printf("        <dia:point val=\"%g,%g\"/>\n",firstp.x,firstp.y);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("      <dia:attribute name=\"obj_bb\">\n");
	dia_printf("        <dia:rectangle val=\"%g,%g;%g,%g\"/>\n",
			llp.x-.11,llp.y-.11,urp.x+.11,urp.y+.11);
	dia_fputs("      </dia:attribute>\n");
	dia_fputs("    </dia:object>\n");
}

static void
dia_user_shape(char *name, point *A, int n, int filled)
{
	char	*imagefile;

	if( cstk[SP].pen == P_NONE ) {
		/* its invisible, don't draw */
		return;
	}
	imagefile = agget(Curnode,"shapefile");

	if (imagefile == 0) {
		dia_polygon(A, n, filled);
	       	return;
	}
}

codegen_t	DIA_CodeGen = {
	dia_reset,
	dia_begin_job, dia_end_job,
	dia_begin_graph, dia_end_graph,
	dia_begin_page, dia_end_page,
	0, /* dia_begin_layer */ 0, /* dia_end_layer */
	dia_begin_cluster, dia_end_cluster,
	0, /* dia_begin_nodes */ 0, /* dia_end_nodes */
	0, /* dia_begin_edges */ 0, /* dia_end_edges */
	dia_begin_node, dia_end_node,
	dia_begin_edge, dia_end_edge,
	dia_begin_context, dia_end_context,
	dia_set_font, dia_textline,
	dia_set_pencolor, dia_set_fillcolor, dia_set_style,
	dia_ellipse, dia_polygon,
	dia_bezier, dia_polyline,
	1, /* bezier_has_arrows */
	0, /* dia_comment */
	0, /* dia_textsize */
	dia_user_shape,
	0 /* dia_usershapesize */
};