2 /* Copyright (C) 1989, 1990, 1991, 1992, 2001, 2002, 2003, 2004, 2005,
4 Free Software Foundation, Inc.
5 Written by James Clark (jjc@jclark.com)
7 This file is part of groff.
9 groff is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation, either version 3 of the License, or
12 (at your option) any later version.
14 groff is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 void print_object_list(object *);
28 line_type::line_type()
29 : type(solid), thickness(1.0)
33 output::output() : args(0), desired_height(0.0), desired_width(0.0)
42 void output::set_desired_width_height(double wid, double ht)
48 void output::set_args(const char *s)
51 if (s == 0 || *s == '\0')
57 int output::supports_filled_polygons()
62 void output::begin_block(const position &, const position &)
66 void output::end_block()
70 double output::compute_scale(double sc, const position &ll, const position &ur)
72 distance dim = ur - ll;
73 if (desired_width != 0.0 || desired_height != 0.0) {
75 if (desired_width != 0.0) {
77 error("width specified for picture with zero width");
79 sc = dim.x/desired_width;
81 if (desired_height != 0.0) {
83 error("height specified for picture with zero height");
85 double tem = dim.y/desired_height;
90 return sc == 0.0 ? 1.0 : sc;
95 distance sdim = dim/sc;
96 double max_width = 0.0;
97 lookup_variable("maxpswid", &max_width);
98 double max_height = 0.0;
99 lookup_variable("maxpsht", &max_height);
100 if ((max_width > 0.0 && sdim.x > max_width)
101 || (max_height > 0.0 && sdim.y > max_height)) {
102 double xscale = dim.x/max_width;
103 double yscale = dim.y/max_height;
104 return xscale > yscale ? xscale : yscale;
111 position::position(const place &pl)
114 // Use two statements to work around bug in SGI C++.
115 object *tem = pl.obj;
116 *this = tem->origin();
124 position::position() : x(0.0), y(0.0)
128 position::position(double a, double b) : x(a), y(b)
133 int operator==(const position &a, const position &b)
135 return a.x == b.x && a.y == b.y;
138 int operator!=(const position &a, const position &b)
140 return a.x != b.x || a.y != b.y;
143 position &position::operator+=(const position &a)
150 position &position::operator-=(const position &a)
157 position &position::operator*=(double a)
164 position &position::operator/=(double a)
171 position operator-(const position &a)
173 return position(-a.x, -a.y);
176 position operator+(const position &a, const position &b)
178 return position(a.x + b.x, a.y + b.y);
181 position operator-(const position &a, const position &b)
183 return position(a.x - b.x, a.y - b.y);
186 position operator/(const position &a, double n)
188 return position(a.x/n, a.y/n);
191 position operator*(const position &a, double n)
193 return position(a.x*n, a.y*n);
198 double operator*(const position &a, const position &b)
200 return a.x*b.x + a.y*b.y;
203 double hypot(const position &a)
205 return groff_hypot(a.x, a.y);
208 struct arrow_head_type {
214 void draw_arrow(const position &pos, const distance &dir,
215 const arrow_head_type &aht, const line_type <,
216 char *outline_color_for_fill)
218 double hyp = hypot(dir);
220 error("cannot draw arrow on object with zero length");
223 position base = -dir;
224 base *= aht.height/hyp;
225 position n(dir.y, -dir.x);
226 n *= aht.width/(hyp*2.0);
228 slt.type = line_type::solid;
229 if (aht.solid && out->supports_filled_polygons()) {
232 v[1] = pos + base + n;
233 v[2] = pos + base - n;
234 // fill with outline color
235 out->set_color(outline_color_for_fill, outline_color_for_fill);
236 // make stroke thin to avoid arrow sticking
238 out->polygon(v, 3, slt, 1);
241 // use two line segments to avoid arrow sticking
242 out->line(pos + base - n, &pos, 1, slt);
243 out->line(pos + base + n, &pos, 1, slt);
247 object::object() : prev(0), next(0)
255 void object::move_by(const position &)
263 void object::print_text()
272 struct bounding_box {
278 void encompass(const position &);
281 bounding_box::bounding_box()
286 void bounding_box::encompass(const position &pos)
305 void object::update_bounding_box(bounding_box *)
309 position object::origin()
311 return position(0.0,0.0);
314 position object::north()
319 position object::south()
324 position object::east()
329 position object::west()
334 position object::north_east()
339 position object::north_west()
344 position object::south_east()
349 position object::south_west()
354 position object::start()
359 position object::end()
364 position object::center()
369 double object::width()
374 double object::radius()
379 double object::height()
384 place *object::find_label(const char *)
389 segment::segment(const position &a, int n, segment *p)
390 : is_absolute(n), pos(a), next(p)
394 text_item::text_item(char *t, const char *fn, int ln)
395 : next(0), text(t), filename(fn), lineno(ln)
397 adj.h = CENTER_ADJUST;
401 text_item::~text_item()
406 object_spec::object_spec(object_type t) : type(t)
411 segment_width = segment_height = 0.0;
412 segment_is_absolute = 0;
419 dir = RIGHT_DIRECTION;
422 object_spec::~object_spec()
425 while (segment_list != 0) {
426 segment *tem = segment_list;
427 segment_list = segment_list->next;
430 object *p = oblist.head;
437 text_item *tem = text;
446 class command_object : public object {
448 const char *filename;
451 command_object(char *, const char *, int);
453 object_type type() { return OTHER_OBJECT; }
457 command_object::command_object(char *p, const char *fn, int ln)
458 : s(p), filename(fn), lineno(ln)
462 command_object::~command_object()
467 void command_object::print()
469 out->command(s, filename, lineno);
472 object *make_command_object(char *s, const char *fn, int ln)
474 return new command_object(s, fn, ln);
477 class mark_object : public object {
483 object *make_mark_object()
485 return new mark_object();
488 mark_object::mark_object()
492 object_type mark_object::type()
497 object_list::object_list() : head(0), tail(0)
501 void object_list::append(object *obj)
504 obj->next = obj->prev = 0;
515 void object_list::wrap_up_block(object_list *ol)
518 for (p = tail; p && p->type() != MARK_OBJECT; p = p->prev)
536 text_piece::text_piece()
537 : text(0), filename(0), lineno(-1)
539 adj.h = CENTER_ADJUST;
543 text_piece::~text_piece()
548 class graphic_object : public object {
559 object_type type() = 0;
561 void add_text(text_item *, int);
562 void set_dotted(double);
563 void set_dashed(double);
564 void set_thickness(double);
565 void set_invisible();
566 void set_outline_color(char *);
567 char *get_outline_color();
568 virtual void set_fill(double);
569 virtual void set_xslanted(double);
570 virtual void set_yslanted(double);
571 virtual void set_fill_color(char *);
574 graphic_object::graphic_object()
575 : ntext(0), text(0), aligned(0), outline_color(0), color_fill(0)
579 void graphic_object::set_dotted(double wid)
581 lt.type = line_type::dotted;
585 void graphic_object::set_dashed(double wid)
587 lt.type = line_type::dashed;
591 void graphic_object::set_thickness(double th)
596 void graphic_object::set_fill(double)
600 void graphic_object::set_xslanted(double)
604 void graphic_object::set_yslanted(double)
608 void graphic_object::set_fill_color(char *c)
610 color_fill = strsave(c);
613 void graphic_object::set_outline_color(char *c)
615 outline_color = strsave(c);
618 char *graphic_object::get_outline_color()
620 return outline_color;
623 void graphic_object::set_invisible()
625 lt.type = line_type::invisible;
628 void graphic_object::add_text(text_item *t, int a)
633 for (p = t; p; p = p->next)
638 text = new text_piece[len];
639 for (p = t, len = 0; p; p = p->next, len++) {
640 text[len].text = p->text;
642 text[len].adj = p->adj;
643 text[len].filename = p->filename;
644 text[len].lineno = p->lineno;
650 void graphic_object::print_text()
654 position d(end() - start());
655 if (d.x != 0.0 || d.y != 0.0)
656 angle = atan2(d.y, d.x);
659 out->set_color(color_fill, get_outline_color());
660 out->text(center(), text, ntext, angle);
665 graphic_object::~graphic_object()
668 ad_delete(ntext) text;
671 class rectangle_object : public graphic_object {
676 rectangle_object(const position &);
677 double width() { return dim.x; }
678 double height() { return dim.y; }
679 position origin() { return cent; }
680 position center() { return cent; }
681 position north() { return position(cent.x, cent.y + dim.y/2.0); }
682 position south() { return position(cent.x, cent.y - dim.y/2.0); }
683 position east() { return position(cent.x + dim.x/2.0, cent.y); }
684 position west() { return position(cent.x - dim.x/2.0, cent.y); }
685 position north_east() { return position(cent.x + dim.x/2.0, cent.y + dim.y/2.0); }
686 position north_west() { return position(cent.x - dim.x/2.0, cent.y + dim.y/2.0); }
687 position south_east() { return position(cent.x + dim.x/2.0, cent.y - dim.y/2.0); }
688 position south_west() { return position(cent.x - dim.x/2.0, cent.y - dim.y/2.0); }
689 object_type type() = 0;
690 void update_bounding_box(bounding_box *);
691 void move_by(const position &);
694 rectangle_object::rectangle_object(const position &d)
699 void rectangle_object::update_bounding_box(bounding_box *p)
701 p->encompass(cent - dim/2.0);
702 p->encompass(cent + dim/2.0);
705 void rectangle_object::move_by(const position &a)
710 class closed_object : public rectangle_object {
712 closed_object(const position &);
713 object_type type() = 0;
714 void set_fill(double);
715 void set_xslanted(double);
716 void set_yslanted(double);
717 void set_fill_color(char *fill);
719 double fill; // < 0 if not filled
720 double xslanted; // !=0 if x is slanted
721 double yslanted; // !=0 if y is slanted
722 char *color_fill; // = 0 if not colored
725 closed_object::closed_object(const position &pos)
726 : rectangle_object(pos), fill(-1.0), xslanted(0), yslanted(0), color_fill(0)
730 void closed_object::set_fill(double f)
736 /* accept positive and negative values */
737 void closed_object::set_xslanted(double s)
742 /* accept positive and negative values */
743 void closed_object::set_yslanted(double s)
749 void closed_object::set_fill_color(char *f)
751 color_fill = strsave(f);
754 class box_object : public closed_object {
758 box_object(const position &, double);
759 object_type type() { return BOX_OBJECT; }
761 position north_east();
762 position north_west();
763 position south_east();
764 position south_west();
767 box_object::box_object(const position &pos, double r)
768 : closed_object(pos), xrad(dim.x > 0 ? r : -r), yrad(dim.y > 0 ? r : -r)
772 const double CHOP_FACTOR = 1.0 - 1.0/M_SQRT2;
774 position box_object::north_east()
776 return position(cent.x + dim.x/2.0 - CHOP_FACTOR*xrad,
777 cent.y + dim.y/2.0 - CHOP_FACTOR*yrad);
780 position box_object::north_west()
782 return position(cent.x - dim.x/2.0 + CHOP_FACTOR*xrad,
783 cent.y + dim.y/2.0 - CHOP_FACTOR*yrad);
786 position box_object::south_east()
788 return position(cent.x + dim.x/2.0 - CHOP_FACTOR*xrad,
789 cent.y - dim.y/2.0 + CHOP_FACTOR*yrad);
792 position box_object::south_west()
794 return position(cent.x - dim.x/2.0 + CHOP_FACTOR*xrad,
795 cent.y - dim.y/2.0 + CHOP_FACTOR*yrad);
798 void box_object::print()
800 if (lt.type == line_type::invisible && fill < 0.0 && color_fill == 0)
802 out->set_color(color_fill, graphic_object::get_outline_color());
804 distance dim2 = dim/2.0;
806 /* error("x slanted %1", xslanted); */
807 /* error("y slanted %1", yslanted); */
808 vec[0] = cent + position(dim2.x, -(dim2.y - yslanted)); /* lr */
809 vec[1] = cent + position(dim2.x + xslanted, dim2.y + yslanted); /* ur */
810 vec[2] = cent + position(-(dim2.x - xslanted), dim2.y); /* ul */
811 vec[3] = cent + position(-(dim2.x), -dim2.y); /* ll */
812 out->polygon(vec, 4, lt, fill);
815 distance abs_dim(fabs(dim.x), fabs(dim.y));
816 out->rounded_box(cent, abs_dim, fabs(xrad), lt, fill, color_fill);
821 graphic_object *object_spec::make_box(position *curpos, direction *dirp)
823 static double last_box_height;
824 static double last_box_width;
825 static double last_box_radius;
826 static int have_last_box = 0;
827 if (!(flags & HAS_HEIGHT)) {
828 if ((flags & IS_SAME) && have_last_box)
829 height = last_box_height;
831 lookup_variable("boxht", &height);
833 if (!(flags & HAS_WIDTH)) {
834 if ((flags & IS_SAME) && have_last_box)
835 width = last_box_width;
837 lookup_variable("boxwid", &width);
839 if (!(flags & HAS_RADIUS)) {
840 if ((flags & IS_SAME) && have_last_box)
841 radius = last_box_radius;
843 lookup_variable("boxrad", &radius);
845 last_box_width = width;
846 last_box_height = height;
847 last_box_radius = radius;
849 radius = fabs(radius);
850 if (radius*2.0 > fabs(width))
851 radius = fabs(width/2.0);
852 if (radius*2.0 > fabs(height))
853 radius = fabs(height/2.0);
854 box_object *p = new box_object(position(width, height), radius);
855 if (!position_rectangle(p, curpos, dirp)) {
862 // return non-zero for success
864 int object_spec::position_rectangle(rectangle_object *p,
865 position *curpos, direction *dirp)
868 dir = *dirp; // ignore any direction in attribute list
872 motion.y = p->height()/2.0;
875 motion.y = -p->height()/2.0;
878 motion.x = -p->width()/2.0;
880 case RIGHT_DIRECTION:
881 motion.x = p->width()/2.0;
886 if (flags & HAS_AT) {
888 if (flags & HAS_WITH) {
892 if (!with->follow(here, &offset))
907 class block_object : public rectangle_object {
911 block_object(const position &, const object_list &ol, PTABLE(place) *t);
913 place *find_label(const char *);
915 void move_by(const position &);
919 block_object::block_object(const position &d, const object_list &ol,
921 : rectangle_object(d), oblist(ol), tbl(t)
925 block_object::~block_object()
928 object *p = oblist.head;
936 void block_object::print()
938 out->begin_block(south_west(), north_east());
939 print_object_list(oblist.head);
943 static void adjust_objectless_places(PTABLE(place) *tbl, const position &a)
945 // Adjust all the labels that aren't attached to objects.
946 PTABLE_ITERATOR(place) iter(tbl);
949 while (iter.next(&key, &pl))
950 if (key && csupper(key[0]) && pl->obj == 0) {
956 void block_object::move_by(const position &a)
959 for (object *p = oblist.head; p; p = p->next)
961 adjust_objectless_places(tbl, a);
965 place *block_object::find_label(const char *name)
967 return tbl->lookup(name);
970 object_type block_object::type()
975 graphic_object *object_spec::make_block(position *curpos, direction *dirp)
978 for (object *p = oblist.head; p; p = p->next)
979 p->update_bounding_box(&bb);
982 position m = -(bb.ll + bb.ur)/2.0;
983 for (object *p = oblist.head; p; p = p->next)
985 adjust_objectless_places(tbl, m);
988 if (flags & HAS_WIDTH)
990 if (flags & HAS_HEIGHT)
992 block_object *block = new block_object(dim, oblist, tbl);
993 if (!position_rectangle(block, curpos, dirp)) {
998 oblist.head = oblist.tail = 0;
1002 class text_object : public rectangle_object {
1004 text_object(const position &);
1005 object_type type() { return TEXT_OBJECT; }
1008 text_object::text_object(const position &d)
1009 : rectangle_object(d)
1013 graphic_object *object_spec::make_text(position *curpos, direction *dirp)
1015 if (!(flags & HAS_HEIGHT)) {
1016 lookup_variable("textht", &height);
1018 for (text_item *t = text; t; t = t->next)
1022 if (!(flags & HAS_WIDTH))
1023 lookup_variable("textwid", &width);
1024 text_object *p = new text_object(position(width, height));
1025 if (!position_rectangle(p, curpos, dirp)) {
1033 class ellipse_object : public closed_object {
1035 ellipse_object(const position &);
1036 position north_east() { return position(cent.x + dim.x/(M_SQRT2*2.0),
1037 cent.y + dim.y/(M_SQRT2*2.0)); }
1038 position north_west() { return position(cent.x - dim.x/(M_SQRT2*2.0),
1039 cent.y + dim.y/(M_SQRT2*2.0)); }
1040 position south_east() { return position(cent.x + dim.x/(M_SQRT2*2.0),
1041 cent.y - dim.y/(M_SQRT2*2.0)); }
1042 position south_west() { return position(cent.x - dim.x/(M_SQRT2*2.0),
1043 cent.y - dim.y/(M_SQRT2*2.0)); }
1044 double radius() { return dim.x/2.0; }
1045 object_type type() { return ELLIPSE_OBJECT; }
1049 ellipse_object::ellipse_object(const position &d)
1054 void ellipse_object::print()
1056 if (lt.type == line_type::invisible && fill < 0.0 && color_fill == 0)
1058 out->set_color(color_fill, graphic_object::get_outline_color());
1059 out->ellipse(cent, dim, lt, fill);
1063 graphic_object *object_spec::make_ellipse(position *curpos, direction *dirp)
1065 static double last_ellipse_height;
1066 static double last_ellipse_width;
1067 static int have_last_ellipse = 0;
1068 if (!(flags & HAS_HEIGHT)) {
1069 if ((flags & IS_SAME) && have_last_ellipse)
1070 height = last_ellipse_height;
1072 lookup_variable("ellipseht", &height);
1074 if (!(flags & HAS_WIDTH)) {
1075 if ((flags & IS_SAME) && have_last_ellipse)
1076 width = last_ellipse_width;
1078 lookup_variable("ellipsewid", &width);
1080 last_ellipse_width = width;
1081 last_ellipse_height = height;
1082 have_last_ellipse = 1;
1083 ellipse_object *p = new ellipse_object(position(width, height));
1084 if (!position_rectangle(p, curpos, dirp)) {
1091 class circle_object : public ellipse_object {
1093 circle_object(double);
1094 object_type type() { return CIRCLE_OBJECT; }
1098 circle_object::circle_object(double diam)
1099 : ellipse_object(position(diam, diam))
1103 void circle_object::print()
1105 if (lt.type == line_type::invisible && fill < 0.0 && color_fill == 0)
1107 out->set_color(color_fill, graphic_object::get_outline_color());
1108 out->circle(cent, dim.x/2.0, lt, fill);
1112 graphic_object *object_spec::make_circle(position *curpos, direction *dirp)
1114 static double last_circle_radius;
1115 static int have_last_circle = 0;
1116 if (!(flags & HAS_RADIUS)) {
1117 if ((flags & IS_SAME) && have_last_circle)
1118 radius = last_circle_radius;
1120 lookup_variable("circlerad", &radius);
1122 last_circle_radius = radius;
1123 have_last_circle = 1;
1124 circle_object *p = new circle_object(radius*2.0);
1125 if (!position_rectangle(p, curpos, dirp)) {
1132 class move_object : public graphic_object {
1136 move_object(const position &s, const position &e);
1137 position origin() { return en; }
1138 object_type type() { return MOVE_OBJECT; }
1139 void update_bounding_box(bounding_box *);
1140 void move_by(const position &);
1143 move_object::move_object(const position &s, const position &e)
1148 void move_object::update_bounding_box(bounding_box *p)
1154 void move_object::move_by(const position &a)
1160 graphic_object *object_spec::make_move(position *curpos, direction *dirp)
1162 static position last_move;
1163 static int have_last_move = 0;
1165 // No need to look at at since `at' attribute sets `from' attribute.
1166 position startpos = (flags & HAS_FROM) ? from : *curpos;
1167 if (!(flags & HAS_SEGMENT)) {
1168 if ((flags & IS_SAME) && have_last_move)
1169 segment_pos = last_move;
1173 segment_pos.y = segment_height;
1175 case DOWN_DIRECTION:
1176 segment_pos.y = -segment_height;
1178 case LEFT_DIRECTION:
1179 segment_pos.x = -segment_width;
1181 case RIGHT_DIRECTION:
1182 segment_pos.x = segment_width;
1189 segment_list = new segment(segment_pos, segment_is_absolute, segment_list);
1190 // Reverse the segment_list so that it's in forward order.
1191 segment *old = segment_list;
1194 segment *tem = old->next;
1195 old->next = segment_list;
1199 // Compute the end position.
1200 position endpos = startpos;
1201 for (segment *s = segment_list; s; s = s->next)
1207 last_move = endpos - startpos;
1208 move_object *p = new move_object(startpos, endpos);
1213 class linear_object : public graphic_object {
1215 char arrow_at_start;
1217 arrow_head_type aht;
1221 linear_object(const position &s, const position &e);
1222 position start() { return strt; }
1223 position end() { return en; }
1224 void move_by(const position &);
1225 void update_bounding_box(bounding_box *) = 0;
1226 object_type type() = 0;
1227 void add_arrows(int at_start, int at_end, const arrow_head_type &);
1230 class line_object : public linear_object {
1235 line_object(const position &s, const position &e, position *, int);
1237 position origin() { return strt; }
1238 position center() { return (strt + en)/2.0; }
1239 position north() { return (en.y - strt.y) > 0 ? en : strt; }
1240 position south() { return (en.y - strt.y) < 0 ? en : strt; }
1241 position east() { return (en.x - strt.x) > 0 ? en : strt; }
1242 position west() { return (en.x - strt.x) < 0 ? en : strt; }
1243 object_type type() { return LINE_OBJECT; }
1244 void update_bounding_box(bounding_box *);
1246 void move_by(const position &);
1249 class arrow_object : public line_object {
1251 arrow_object(const position &, const position &, position *, int);
1252 object_type type() { return ARROW_OBJECT; }
1255 class spline_object : public line_object {
1257 spline_object(const position &, const position &, position *, int);
1258 object_type type() { return SPLINE_OBJECT; }
1260 void update_bounding_box(bounding_box *);
1263 linear_object::linear_object(const position &s, const position &e)
1264 : arrow_at_start(0), arrow_at_end(0), strt(s), en(e)
1268 void linear_object::move_by(const position &a)
1274 void linear_object::add_arrows(int at_start, int at_end,
1275 const arrow_head_type &a)
1277 arrow_at_start = at_start;
1278 arrow_at_end = at_end;
1282 line_object::line_object(const position &s, const position &e,
1284 : linear_object(s, e), v(p), n(i)
1288 void line_object::print()
1290 if (lt.type == line_type::invisible)
1292 out->set_color(0, graphic_object::get_outline_color());
1293 // shorten line length to avoid arrow sticking.
1295 if (arrow_at_start) {
1296 position base = v[0] - strt;
1297 double hyp = hypot(base);
1299 error("cannot draw arrow on object with zero length");
1302 if (aht.solid && out->supports_filled_polygons()) {
1303 base *= aht.height / hyp;
1304 draw_arrow(strt, strt - v[0], aht, lt,
1305 graphic_object::get_outline_color());
1308 base *= fabs(lt.thickness) / hyp / 72 / 4;
1310 draw_arrow(sp, sp - v[0], aht, lt,
1311 graphic_object::get_outline_color());
1315 position base = v[n-1] - (n > 1 ? v[n-2] : strt);
1316 double hyp = hypot(base);
1318 error("cannot draw arrow on object with zero length");
1321 if (aht.solid && out->supports_filled_polygons()) {
1322 base *= aht.height / hyp;
1323 draw_arrow(en, v[n-1] - (n > 1 ? v[n-2] : strt), aht, lt,
1324 graphic_object::get_outline_color());
1327 base *= fabs(lt.thickness) / hyp / 72 / 4;
1329 draw_arrow(v[n-1], v[n-1] - (n > 1 ? v[n-2] : strt), aht, lt,
1330 graphic_object::get_outline_color());
1333 out->line(sp, v, n, lt);
1337 void line_object::update_bounding_box(bounding_box *p)
1340 for (int i = 0; i < n; i++)
1344 void line_object::move_by(const position &pos)
1346 linear_object::move_by(pos);
1347 for (int i = 0; i < n; i++)
1351 void spline_object::update_bounding_box(bounding_box *p)
1363 [ the points for the Bezier cubic ]
1371 (1-t)^3*p1 + 3*t*(t - 1)^2*p2 + 3*t^2*(1-t)*p3 + t^3*p4
1372 [ the equation for the Bezier cubic ]
1374 = .125*q1 + .75*q2 + .125*q3
1377 for (int i = 1; i < n; i++)
1378 p->encompass((i == 1 ? strt : v[i-2])*.125 + v[i-1]*.75 + v[i]*.125);
1381 arrow_object::arrow_object(const position &s, const position &e,
1383 : line_object(s, e, p, i)
1387 spline_object::spline_object(const position &s, const position &e,
1389 : line_object(s, e, p, i)
1393 void spline_object::print()
1395 if (lt.type == line_type::invisible)
1397 out->set_color(0, graphic_object::get_outline_color());
1398 // shorten line length for spline to avoid arrow sticking
1400 if (arrow_at_start) {
1401 position base = v[0] - strt;
1402 double hyp = hypot(base);
1404 error("cannot draw arrow on object with zero length");
1407 if (aht.solid && out->supports_filled_polygons()) {
1408 base *= aht.height / hyp;
1409 draw_arrow(strt, strt - v[0], aht, lt,
1410 graphic_object::get_outline_color());
1411 sp = strt + base*0.1; // to reserve spline shape
1413 base *= fabs(lt.thickness) / hyp / 72 / 4;
1415 draw_arrow(sp, sp - v[0], aht, lt,
1416 graphic_object::get_outline_color());
1420 position base = v[n-1] - (n > 1 ? v[n-2] : strt);
1421 double hyp = hypot(base);
1423 error("cannot draw arrow on object with zero length");
1426 if (aht.solid && out->supports_filled_polygons()) {
1427 base *= aht.height / hyp;
1428 draw_arrow(en, v[n-1] - (n > 1 ? v[n-2] : strt), aht, lt,
1429 graphic_object::get_outline_color());
1430 v[n-1] = en - base*0.1; // to reserve spline shape
1432 base *= fabs(lt.thickness) / hyp / 72 / 4;
1434 draw_arrow(v[n-1], v[n-1] - (n > 1 ? v[n-2] : strt), aht, lt,
1435 graphic_object::get_outline_color());
1438 out->spline(sp, v, n, lt);
1442 line_object::~line_object()
1447 linear_object *object_spec::make_line(position *curpos, direction *dirp)
1449 static position last_line;
1450 static int have_last_line = 0;
1452 // We handle `at' only in conjunction with `with', otherwise it is
1453 // the same as the `from' attribute.
1455 if ((flags & HAS_AT) && (flags & HAS_WITH))
1456 // handled later -- we need the end position
1458 else if (flags & HAS_FROM)
1462 if (!(flags & HAS_SEGMENT)) {
1463 if ((flags & IS_SAME) && (type == LINE_OBJECT || type == ARROW_OBJECT)
1465 segment_pos = last_line;
1469 segment_pos.y = segment_height;
1471 case DOWN_DIRECTION:
1472 segment_pos.y = -segment_height;
1474 case LEFT_DIRECTION:
1475 segment_pos.x = -segment_width;
1477 case RIGHT_DIRECTION:
1478 segment_pos.x = segment_width;
1484 segment_list = new segment(segment_pos, segment_is_absolute, segment_list);
1485 // reverse the segment_list so that it's in forward order
1486 segment *old = segment_list;
1489 segment *tem = old->next;
1490 old->next = segment_list;
1494 // Absolutise all movements
1495 position endpos = startpos;
1498 for (s = segment_list; s; s = s->next, nsegments++)
1504 s->is_absolute = 1; // to avoid confusion
1506 if ((flags & HAS_AT) && (flags & HAS_WITH)) {
1507 // `tmpobj' works for arrows and splines too -- we only need positions
1508 line_object tmpobj(startpos, endpos, 0, 0);
1513 if (!with->follow(here, &offset))
1516 for (s = segment_list; s; s = s->next)
1523 position *v = new position[nsegments];
1525 for (s = segment_list; s; s = s->next, i++)
1527 if (flags & IS_DEFAULT_CHOPPED) {
1528 lookup_variable("circlerad", &start_chop);
1529 end_chop = start_chop;
1530 flags |= IS_CHOPPED;
1532 if (flags & IS_CHOPPED) {
1533 position start_chop_vec, end_chop_vec;
1534 if (start_chop != 0.0) {
1535 start_chop_vec = v[0] - startpos;
1536 start_chop_vec *= start_chop / hypot(start_chop_vec);
1538 if (end_chop != 0.0) {
1539 end_chop_vec = (v[nsegments - 1]
1540 - (nsegments > 1 ? v[nsegments - 2] : startpos));
1541 end_chop_vec *= end_chop / hypot(end_chop_vec);
1543 startpos += start_chop_vec;
1544 v[nsegments - 1] -= end_chop_vec;
1545 endpos -= end_chop_vec;
1549 p = new spline_object(startpos, endpos, v, nsegments);
1552 p = new arrow_object(startpos, endpos, v, nsegments);
1555 p = new line_object(startpos, endpos, v, nsegments);
1561 last_line = endpos - startpos;
1566 class arc_object : public linear_object {
1571 arc_object(int, const position &, const position &, const position &);
1572 position origin() { return cent; }
1573 position center() { return cent; }
1574 double radius() { return rad; }
1579 position north_east();
1580 position north_west();
1581 position south_east();
1582 position south_west();
1583 void update_bounding_box(bounding_box *);
1584 object_type type() { return ARC_OBJECT; }
1586 void move_by(const position &pos);
1589 arc_object::arc_object(int cw, const position &s, const position &e,
1591 : linear_object(s, e), clockwise(cw), cent(c)
1596 void arc_object::move_by(const position &pos)
1598 linear_object::move_by(pos);
1602 // we get arc corners from the corresponding circle
1604 position arc_object::north()
1606 position result(cent);
1611 position arc_object::south()
1613 position result(cent);
1618 position arc_object::east()
1620 position result(cent);
1625 position arc_object::west()
1627 position result(cent);
1632 position arc_object::north_east()
1634 position result(cent);
1635 result.x += rad/M_SQRT2;
1636 result.y += rad/M_SQRT2;
1640 position arc_object::north_west()
1642 position result(cent);
1643 result.x -= rad/M_SQRT2;
1644 result.y += rad/M_SQRT2;
1648 position arc_object::south_east()
1650 position result(cent);
1651 result.x += rad/M_SQRT2;
1652 result.y -= rad/M_SQRT2;
1656 position arc_object::south_west()
1658 position result(cent);
1659 result.x -= rad/M_SQRT2;
1660 result.y -= rad/M_SQRT2;
1665 void arc_object::print()
1667 if (lt.type == line_type::invisible)
1669 out->set_color(0, graphic_object::get_outline_color());
1670 // handle arrow direction; make shorter line for arc
1679 if (arrow_at_start) {
1680 double theta = aht.height / rad;
1684 b = position(b.x*cos(theta) - b.y*sin(theta),
1685 b.x*sin(theta) + b.y*cos(theta)) + cent;
1690 if (aht.solid && out->supports_filled_polygons()) {
1691 draw_arrow(strt, strt - b, aht, lt,
1692 graphic_object::get_outline_color());
1695 theta = fabs(lt.thickness) / 72 / 4 / rad;
1699 b = position(b.x*cos(theta) - b.y*sin(theta),
1700 b.x*sin(theta) + b.y*cos(theta)) + cent;
1701 draw_arrow(b, b - v, aht, lt,
1702 graphic_object::get_outline_color());
1703 out->line(b, &v, 1, lt);
1707 double theta = aht.height / rad;
1711 b = position(b.x*cos(theta) - b.y*sin(theta),
1712 b.x*sin(theta) + b.y*cos(theta)) + cent;
1717 if (aht.solid && out->supports_filled_polygons()) {
1718 draw_arrow(en, en - b, aht, lt,
1719 graphic_object::get_outline_color());
1722 theta = fabs(lt.thickness) / 72 / 4 / rad;
1726 b = position(b.x*cos(theta) - b.y*sin(theta),
1727 b.x*sin(theta) + b.y*cos(theta)) + cent;
1728 draw_arrow(b, b - v, aht, lt,
1729 graphic_object::get_outline_color());
1730 out->line(b, &v, 1, lt);
1733 out->arc(sp, cent, ep, lt);
1737 inline double max(double a, double b)
1739 return a > b ? a : b;
1742 void arc_object::update_bounding_box(bounding_box *p)
1746 position start_offset = strt - cent;
1747 if (start_offset.x == 0.0 && start_offset.y == 0.0)
1749 position end_offset = en - cent;
1750 if (end_offset.x == 0.0 && end_offset.y == 0.0)
1752 double start_quad = atan2(start_offset.y, start_offset.x)/(M_PI/2.0);
1753 double end_quad = atan2(end_offset.y, end_offset.x)/(M_PI/2.0);
1755 double temp = start_quad;
1756 start_quad = end_quad;
1759 if (start_quad < 0.0)
1761 while (end_quad <= start_quad)
1763 double r = max(hypot(start_offset), hypot(end_offset));
1764 for (int q = int(start_quad) + 1; q < end_quad; q++) {
1780 p->encompass(cent + offset);
1784 // We ignore the with attribute. The at attribute always refers to the center.
1786 linear_object *object_spec::make_arc(position *curpos, direction *dirp)
1789 int cw = (flags & IS_CLOCKWISE) != 0;
1790 // compute the start
1792 if (flags & HAS_FROM)
1796 if (!(flags & HAS_RADIUS))
1797 lookup_variable("arcrad", &radius);
1803 position m(radius, radius);
1804 // Adjust the signs.
1806 if (dir == DOWN_DIRECTION || dir == LEFT_DIRECTION)
1808 if (dir == DOWN_DIRECTION || dir == RIGHT_DIRECTION)
1810 *dirp = direction((dir + 3) % 4);
1813 if (dir == UP_DIRECTION || dir == LEFT_DIRECTION)
1815 if (dir == DOWN_DIRECTION || dir == LEFT_DIRECTION)
1817 *dirp = direction((dir + 1) % 4);
1819 endpos = startpos + m;
1821 // compute the center
1825 else if (startpos == endpos)
1826 centerpos = startpos;
1828 position h = (endpos - startpos)/2.0;
1829 double d = hypot(h);
1832 // make the radius big enough
1835 double alpha = acos(d/radius);
1836 double theta = atan2(h.y, h.x);
1841 centerpos = position(cos(theta), sin(theta))*radius + startpos;
1843 arc_object *p = new arc_object(cw, startpos, endpos, centerpos);
1848 graphic_object *object_spec::make_linear(position *curpos, direction *dirp)
1851 if (type == ARC_OBJECT)
1852 obj = make_arc(curpos, dirp);
1854 obj = make_line(curpos, dirp);
1855 if (type == ARROW_OBJECT
1856 && (flags & (HAS_LEFT_ARROW_HEAD|HAS_RIGHT_ARROW_HEAD)) == 0)
1857 flags |= HAS_RIGHT_ARROW_HEAD;
1858 if (obj && (flags & (HAS_LEFT_ARROW_HEAD|HAS_RIGHT_ARROW_HEAD))) {
1860 int at_start = (flags & HAS_LEFT_ARROW_HEAD) != 0;
1861 int at_end = (flags & HAS_RIGHT_ARROW_HEAD) != 0;
1862 if (flags & HAS_HEIGHT)
1865 lookup_variable("arrowht", &a.height);
1866 if (flags & HAS_WIDTH)
1869 lookup_variable("arrowwid", &a.width);
1871 lookup_variable("arrowhead", &solid);
1872 a.solid = solid != 0.0;
1873 obj->add_arrows(at_start, at_end, a);
1878 object *object_spec::make_object(position *curpos, direction *dirp)
1880 graphic_object *obj = 0;
1883 obj = make_block(curpos, dirp);
1886 obj = make_box(curpos, dirp);
1889 obj = make_text(curpos, dirp);
1891 case ELLIPSE_OBJECT:
1892 obj = make_ellipse(curpos, dirp);
1895 obj = make_circle(curpos, dirp);
1898 obj = make_move(curpos, dirp);
1904 obj = make_linear(curpos, dirp);
1913 if (flags & IS_INVISIBLE)
1914 obj->set_invisible();
1916 obj->add_text(text, (flags & IS_ALIGNED) != 0);
1917 if (flags & IS_DOTTED)
1918 obj->set_dotted(dash_width);
1919 else if (flags & IS_DASHED)
1920 obj->set_dashed(dash_width);
1922 if (flags & HAS_THICKNESS)
1925 lookup_variable("linethick", &th);
1926 obj->set_thickness(th);
1927 if (flags & IS_OUTLINED)
1928 obj->set_outline_color(outlined);
1929 if (flags & IS_XSLANTED)
1930 obj->set_xslanted(xslanted);
1931 if (flags & IS_YSLANTED)
1932 obj->set_yslanted(yslanted);
1933 if (flags & (IS_DEFAULT_FILLED | IS_FILLED)) {
1934 if (flags & IS_SHADED)
1935 obj->set_fill_color(shaded);
1937 if (flags & IS_DEFAULT_FILLED)
1938 lookup_variable("fillval", &fill);
1940 error("bad fill value %1", fill);
1942 obj->set_fill(fill);
1949 struct string_list {
1952 string_list(char *);
1956 string_list::string_list(char *s)
1961 string_list::~string_list()
1966 /* A path is used to hold the argument to the `with' attribute. For
1967 example, `.nw' or `.A.s' or `.A'. The major operation on a path is to
1968 take a place and follow the path through the place to place within the
1969 place. Note that `.A.B.C.sw' will work.
1971 For compatibility with DWB pic, `with' accepts positions also (this
1972 is incorrectly documented in CSTR 116). */
1974 path::path(corner c)
1975 : crn(c), label_list(0), ypath(0), is_position(0)
1979 path::path(position p)
1980 : crn(0), label_list(0), ypath(0), is_position(1)
1986 path::path(char *l, corner c)
1987 : crn(c), ypath(0), is_position(0)
1989 label_list = new string_list(l);
1994 while (label_list) {
1995 string_list *tem = label_list;
1996 label_list = label_list->next;
2002 void path::append(corner c)
2008 void path::append(char *s)
2011 for (p = &label_list; *p; p = &(*p)->next)
2013 *p = new string_list(s);
2016 void path::set_ypath(path *p)
2021 // return non-zero for success
2023 int path::follow(const place &pl, place *result) const
2031 const place *p = &pl;
2032 for (string_list *lb = label_list; lb; lb = lb->next)
2033 if (p->obj == 0 || (p = p->obj->find_label(lb->str)) == 0) {
2034 lex_error("object does not contain a place `%1'", lb->str);
2037 if (crn == 0 || p->obj == 0)
2040 position ps = ((p->obj)->*(crn))();
2047 if (!ypath->follow(pl, &tem))
2050 if (result->obj != tem.obj)
2056 void print_object_list(object *p)
2058 for (; p; p = p->next) {
2064 void print_picture(object *obj)
2067 for (object *p = obj; p; p = p->next)
2068 p->update_bounding_box(&bb);
2070 lookup_variable("scale", &scale);
2071 out->start_picture(scale, bb.ll, bb.ur);
2072 print_object_list(obj);
2073 out->finish_picture();