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/*
* TransFig: Facility for Translating Fig code
* Copyright (c) 1999 by T. Sato
* Parts Copyright (c) 1989-2002 by Brian V. Smith
*
* Any party obtaining a copy of these files is granted, free of charge, a
* full and unrestricted irrevocable, world-wide, paid up, royalty-free,
* nonexclusive right and license to deal in this software and
* documentation files (the "Software"), including without limitation the
* rights to use, copy, modify, merge, publish and/or distribute copies of
* the Software, and to permit persons who receive copies from any such
* party to do so, with the only requirement being that this copyright
* notice remain intact.
*
*/
/*
* genmap.c: HTML imagemap driver for fig2dev
*
* T.Sato <VEF00200@nifty.ne.jp>
*
*
* Description:
* Generate HTML imagemap from Fig file.
* If an object has comment like ``HREF="url" ALT="string"'',
* the object will become a link to the URL.
* Object with smaller depth will be listed before deeper ones.
* Figure comment will be used as the default link.
*/
#include "fig2dev.h"
#include "object.h"
#define TEXT_LENGTH 300
static int border_margin = 0;
static char url[TEXT_LENGTH], alt[TEXT_LENGTH];
static char buf[2000];
struct hlink_item {
char *url;
char *alt;
char *area;
struct hlink_item* prev;
};
typedef struct hlink_item hlink;
/* The last link that was added. */
static hlink* last_link = 0;
#define fscale 15
#define XZOOM(x) round(mag * ((x) - llx) / fscale + border_margin)
#define YZOOM(y) round(mag * ((y) - lly) / fscale + border_margin)
#define MIN_DIST 5 /* ignore closer points when processing polyline */
#define ARC_STEP (M_PI / 9.0)
#define ARC_EXPAND 1.02 /* make polygon slightly larger */
void
genmap_option(opt, optarg)
char opt;
char *optarg;
{
switch (opt) {
case 'b': /* border margin */
sscanf(optarg,"%d",&border_margin);
break;
case 'L': /* ignore language and magnif. */
case 'm':
break;
default:
put_msg(Err_badarg, opt, "map");
exit(1);
}
}
static char *
is_link(comment)
F_comment *comment;
{
char *cp1, *cp2;
Boolean have_alt = False;
int i;
url[0] = '\0';
alt[0] = '\0';
while (comment != NULL) {
cp1 = comment->comment;
while (isspace(*cp1)) cp1++; /* ignore leading spaces */
if (strncasecmp(cp1, "HREF=", 5) == 0) {
/* comment like "HREF=url ALT=string" */
cp2 = cp1 + 5;
while (isspace(*cp2)) cp2++; /* spaces */
i = 0;
while (isgraph(*cp2)) url[i++] = *(cp2++); /* URL */
url[i] = '\0';
while (isspace(*cp2)) cp2++; /* spaces */
if (*cp2 != '\0') {
if (strncasecmp(cp2, "ALT=", 4) == 0) {
have_alt = True;
cp2 = cp2 + 4;
while (isspace(*cp2)) cp2++; /* spaces */
i = 0;
if (*cp2 == '"') {
cp2++;
while (*cp2 != '\0' && *cp2 != '"') alt[i++] = *(cp2++); /* text */
} else {
while (isgraph(*cp2)) alt[i++] = *(cp2++); /* text */
}
alt[i] = '\0';
} else {
fprintf(stderr, "fig2dev(map): unknown attribute: %s\n", cp2);
}
}
if (!have_alt)
fprintf(stderr, "fig2dev(map): ALT is required in HTML 3.2: %s\n", cp1);
return cp1;
}
comment = comment->next;
}
return NULL;
}
void
add_link(char *area)
{
hlink* hl = (hlink*)malloc(sizeof(hlink));
hl->url = (char *)malloc(strlen(url) + 1);
strcpy(hl->url, url);
hl->alt = (char *)malloc(strlen(alt) + 1);
strcpy(hl->alt, alt);
hl->area = (char *)malloc(strlen(area) + 1);
strcpy(hl->area, area);
hl->prev = last_link;
last_link=hl;
}
void
genmap_start(objects)
F_compound *objects;
{
char *basename;
char *ref;
int i;
if (to != NULL) {
basename = (char *)malloc(strlen(to) + 1);
strcpy(basename, to);
for (i = strlen(basename) - 1; 0 < i; i--) {
if (basename[i] == '.') {
basename[i] = '\0';
break;
}
}
} else {
basename = "imagemap";
}
fprintf(tfp, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Frameset//EN\">\n");
fprintf(tfp, "<HTML>\n");
fprintf(tfp, "<HEAD><TITLE>HTML imagemap generated by fig2dev</TITLE></HEAD>\n");
fprintf(tfp, "<BODY>\n\n");
fprintf(tfp, "<H1>HTML imagemap generated by fig2dev</H1>\n");
fprintf(tfp, "<P>This file is generated by fig2dev.</P>\n");
fprintf(tfp, "<P>You can copy the following lines into your HTML document.\n");
fprintf(tfp, "You may need to edit the name of the image file in the first line.</P>\n");
fprintf(tfp, "\n");
fprintf(tfp, "<IMG SRC=\"%s.png\" USEMAP=\"#%s\">\n", basename, basename);
fprintf(tfp, "<MAP NAME=\"%s\">\n", basename);
ref = is_link(objects->comments);
if (ref != NULL) {
sprintf(buf, "<AREA COORDS=\"%d,%d,%d,%d\" %s>\n",
XZOOM(llx), YZOOM(lly), XZOOM(urx), YZOOM(ury), ref);
add_link(buf);
}
}
int
genmap_end()
{
hlink* l;
int len;
char label[TEXT_LENGTH];
for (l = last_link; l!= 0; l=l->prev) {
fprintf(tfp, "%s", l->area);
}
fprintf(tfp, "</MAP>\n");
fprintf(tfp, "\n");
fprintf(tfp, "<h2>Alternative Text Links</h2>\n");
fprintf(tfp, "<P>Because not all people can use imagemaps,\n");
fprintf(tfp, "it is recommended to prepare an alternative way for the people\n");
fprintf(tfp, "who can't use or don't want to use them.</P>\n");
fprintf(tfp, "<P>Here are text the links extracted from the above imagemap.\n");
fprintf(tfp, "If the ALT attribute (it is required in HTML 3.2) was not specified\n");
fprintf(tfp, "in the imagemap, those URLs will be displayed\n");
fprintf(tfp, "instead of labels specified by the ALT attributes.</P>\n");
fprintf(tfp, "\n");
fprintf(tfp, "<P ALIGN=\"CENTER\">\n");
len = 0;
for (l = last_link; l!= 0; l=l->prev) {
if (l->alt[0] != '\0') strcpy(label, l->alt);
else sprintf(label, "<TT>%s</TT>", l->url);
fprintf(tfp, "%s<A HREF=%s>%s</A>\n",
(len == 0) ? "" : " | ", l->url, label);
len = len + strlen(label) + 3;
if (50 < len) {
fprintf(tfp, "<BR>\n");
len = 0;
}
}
fprintf(tfp, "</P>\n");
fprintf(tfp, "\n");
fprintf(tfp, "</BODY>\n");
fprintf(tfp, "</HTML>\n");
/* all ok */
return 0;
}
void
genmap_arc(a)
F_arc *a;
{
char *ref;
int cx, cy, sx, sy, ex, ey;
double r;
double sa, ea;
double alpha;
ref = is_link(a->comments);
if (ref != NULL) {
cx = XZOOM(a->center.x);
cy = YZOOM(a->center.y);
sx = XZOOM(a->point[0].x);
sy = YZOOM(a->point[0].y);
ex = XZOOM(a->point[2].x);
ey = YZOOM(a->point[2].y);
if (a->direction == 0) {
sa = atan2((double)(sy - cy), (double)(sx - cx));
ea = atan2((double)(ey - cy), (double)(ex - cx));
} else {
ea = atan2((double)(sy - cy), (double)(sx - cx));
sa = atan2((double)(ey - cy), (double)(ex - cx));
}
if (ea < sa) ea = ea + 2 * M_PI;
r = sqrt((double)((sx - cx) * (sx - cx)
+ (sy - cy) * (sy - cy))) * ARC_EXPAND + 1.0;
sprintf(buf, "<AREA SHAPE=\"poly\" COORDS=\"");
if (a->type == T_PIE_WEDGE_ARC)
sprintf(&buf[strlen(buf)], "%d,%d,", cx, cy);
for (alpha = sa; alpha < (ea - ARC_STEP / 4); alpha += ARC_STEP) {
if (alpha != sa) sprintf(&buf[strlen(buf)], ",");
sprintf(&buf[strlen(buf)], "%d,%d",
round(cx + r * cos(alpha)), round(cy + r * sin(alpha)));
}
sprintf(&buf[strlen(buf)], ",%d,%d",
round(cx + r * cos(ea)), round(cy + r * sin(ea)));
sprintf(&buf[strlen(buf)], "\" %s>\n", ref);
add_link(buf);
}
}
void
genmap_ellipse(e)
F_ellipse *e;
{
char *ref;
int x0, y0;
double rx, ry;
double angle, theta;
ref = is_link(e->comments);
if (ref != NULL) {
x0 = XZOOM(e->center.x);
y0 = YZOOM(e->center.y);
rx = mag * e->radiuses.x / fscale;
ry = mag * e->radiuses.y / fscale;
angle = - e->angle;
if (e->radiuses.x == e->radiuses.y) {
sprintf(buf, "<AREA SHAPE=\"circle\" COORDS=\"%d,%d,%d\" %s>\n",
x0, y0, round(rx) + 1, ref);
add_link(buf);
} else {
rx = rx * ARC_EXPAND + 1.0;
ry = ry * ARC_EXPAND + 1.0;
sprintf(buf, "<AREA SHAPE=\"poly\" COORDS=\"");
for (theta = 0.0; theta < 2.0 * M_PI; theta += ARC_STEP) {
if (theta != 0.0) sprintf(&buf[strlen(buf)], ",");
sprintf(&buf[strlen(buf)], "%d,%d",
round(x0 + cos(angle) * rx * cos(theta)
- sin(angle) * ry * sin(theta)),
round(y0 + sin(angle) * rx * cos(theta)
+ cos(angle) * ry * sin(theta)));
}
sprintf(&buf[strlen(buf)], "\" %s>\n", ref);
add_link(buf);
}
}
}
void
genmap_line(l)
F_line *l;
{
char *ref;
int xmin, xmax, ymin, ymax;
int x, y, last_x, last_y;
F_point *p;
ref = is_link(l->comments);
if (ref != NULL) {
switch (l->type) {
case T_BOX:
case T_ARC_BOX:
case T_PIC_BOX:
xmin = xmax = l->points->x;
ymin = ymax = l->points->y;
for (p = l->points->next; p != NULL; p = p->next) {
if (p->x < xmin) xmin = p->x;
if (xmax < p->x) xmax = p->x;
if (p->y < ymin) ymin = p->y;
if (ymax < p->y) ymax = p->y;
}
sprintf(buf, "<AREA COORDS=\"%d,%d,%d,%d\" %s>\n",
XZOOM(xmin), YZOOM(ymin), XZOOM(xmax), YZOOM(ymax), ref);
add_link(buf);
break;
case T_POLYLINE:
case T_POLYGON:
sprintf(buf, "<AREA SHAPE=\"poly\" COORDS=\"");
for (p = l->points; (l->type==T_POLYLINE? p: p->next) != NULL; p = p->next) {
x = XZOOM(p->x);
y = YZOOM(p->y);
if (p == l->points
|| MIN_DIST < abs(last_x - x) || MIN_DIST < abs(last_y - y)) {
if (sizeof(buf) < strlen(buf) + 100) {
fprintf(stderr, "fig2dev(map): too complex POLYLINE... ignored\n");
return;
} else {
if (p != l->points) sprintf(&buf[strlen(buf)], ",");
sprintf(&buf[strlen(buf)], "%d,%d", x, y);
last_x = x;
last_y = y;
}
}
}
sprintf(&buf[strlen(buf)], "\" %s>\n", ref);
add_link(buf);
break;
}
}
}
void
genmap_text(t)
F_text *t;
{
char *ref;
ref = is_link(t->comments);
if (ref != NULL) {
fprintf(stderr, "fig2dev(map): TEXT can't be used as link region\n");
}
}
struct driver dev_map = {
genmap_option,
genmap_start,
gendev_null,
genmap_arc,
genmap_ellipse,
genmap_line,
gendev_null,
genmap_text,
genmap_end,
INCLUDE_TEXT
};
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