home *** CD-ROM | disk | FTP | other *** search
- // -*- C++ -*-
- /* Copyright (C) 1989, 1990 Free Software Foundation, Inc.
- Written by James Clark (jjc@jclark.uucp)
-
- This file is part of groff.
-
- groff is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 1, or (at your option) any later
- version.
-
- groff is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License along
- with groff; see the file LICENSE. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #ifdef TEX_SUPPORT
-
- #include "pic.h"
- #include "common.h"
-
- class tex_output : public common_output {
- public:
- tex_output();
- ~tex_output();
- void start_picture(double, const position &ll, const position &ur);
- void finish_picture();
- void text(const position &, text_piece *, int, double);
- void line(const position &, const position *, int n,
- const line_type &);
- void polygon(const position *, int n,
- const line_type &, double);
- void spline(const position &, const position *, int n,
- const line_type &);
- void arc(const position &, const position &, const position &,
- const line_type &);
- void circle(const position &, double rad, const line_type &, double);
- void ellipse(const position &, const distance &, const line_type &, double);
- void command(const char *, const char *, int);
- int supports_filled_polygons();
- private:
- position upper_left;
- double height;
- double width;
- double scale;
- double pen_size;
-
- void point(const position &);
- void dot(const position &, const line_type &);
- void solid_arc(const position ¢, double rad, double start_angle,
- double end_angle, const line_type <);
- position transform(const position &);
- protected:
- virtual void set_pen_size(double ps);
- };
-
- // convert inches to milliinches
-
- inline int milliinches(double x)
- {
- return int(x*1000.0 + .5);
- }
-
- inline position tex_output::transform(const position &pos)
- {
- return position((pos.x - upper_left.x)/scale,
- (upper_left.y - pos.y)/scale);
- }
-
- output *make_tex_output()
- {
- return new tex_output;
- }
-
- tex_output::tex_output()
- {
- }
-
- tex_output::~tex_output()
- {
- }
-
- const int DEFAULT_PEN_SIZE = 8;
-
- void tex_output::set_pen_size(double ps)
- {
- if (ps < 0.0)
- ps = -1.0;
- if (ps != pen_size) {
- pen_size = ps;
- printf(" \\special{pn %d}%%\n",
- ps < 0.0 ? DEFAULT_PEN_SIZE : int(ps*(1000.0/72.0) + .5));
- }
- }
-
- void tex_output::start_picture(double sc, const position &ll,
- const position &ur)
- {
- upper_left.x = ll.x;
- upper_left.y = ur.y;
- scale = compute_scale(sc, ll, ur);
- height = (ur.y - ll.y)/scale;
- width = (ur.x - ll.x)/scale;
- /* the point of \vskip 0pt is to ensure that the vtop gets
- a height of 0 rather than the height of the hbox; this
- might be non-zero if text from text attributes lies outside pic's
- idea of the bounding box of the picture. */
- fputs("\\expandafter\\ifx\\csname graph\\endcsname\\relax \\csname newbox\\endcsname\\graph\\fi\n"
- "\\expandafter\\ifx\\csname graphtemp\\endcsname\\relax \\csname newdimen\\endcsname\\graphtemp\\fi\n"
- "\\setbox\\graph=\\vtop{\\vskip 0pt\\hbox{%\n",
- stdout);
- pen_size = -2.0;
- }
-
- void tex_output::finish_picture()
- {
- printf(" \\hbox{\\vrule depth%.3fin width0pt height 0pt}%%\n"
- " \\kern %.3fin\n"
- " }%%\n"
- "}%%\n",
- height, width);
- }
-
- void tex_output::text(const position ¢er, text_piece *v, int n, double)
- {
- position c = transform(center);
- for (int i = 0; i < n; i++)
- if (v[i].text != 0 && *v[i].text != '\0') {
- int j = 2*i - n + 1;
- if (v[i].adj.v == ABOVE_ADJUST)
- j--;
- else if (v[i].adj.v == BELOW_ADJUST)
- j++;
- if (j == 0) {
- printf(" \\graphtemp=.5ex\\advance\\graphtemp by %.3fin\n", c.y);
- }
- else {
- printf(" \\graphtemp=\\baselineskip"
- "\\multiply\\graphtemp by %d"
- "\\divide\\graphtemp by 2\n"
- " \\advance\\graphtemp by .5ex"
- "\\advance\\graphtemp by %.3fin\n",
- j, c.y);
- }
- printf(" \\rlap{\\kern %.3fin\\lower\\graphtemp", c.x);
- fputs("\\hbox to 0pt{", stdout);
- if (v[i].adj.h != LEFT_ADJUST)
- fputs("\\hss ", stdout);
- fputs(v[i].text, stdout);
- if (v[i].adj.h != RIGHT_ADJUST)
- fputs("\\hss", stdout);
- fputs("}}%\n", stdout);
- }
- }
-
- void tex_output::point(const position &pos)
- {
- position p = transform(pos);
- printf(" \\special{pa %d %d}%%\n", milliinches(p.x), milliinches(p.y));
- }
-
- void tex_output::line(const position &start, const position *v, int n,
- const line_type <)
- {
- set_pen_size(lt.thickness);
- point(start);
- for (int i = 0; i < n; i++)
- point(v[i]);
- fputs(" \\special{", stdout);
- switch(lt.type) {
- case line_type::invisible:
- fputs("ip", stdout);
- break;
- case line_type::solid:
- fputs("fp", stdout);
- break;
- case line_type::dotted:
- printf("dt %.3f", lt.dash_width/scale);
- break;
- case line_type::dashed:
- printf("da %.3f", lt.dash_width/scale);
- break;
- }
- fputs("}%\n", stdout);
- }
-
- void tex_output::polygon(const position *v, int n,
- const line_type <, double fill)
- {
- if (fill >= 0.0) {
- if (fill > 1.0)
- fill = 1.0;
- printf(" \\special{sh %.3f}%%\n", fill);
- }
- line(v[n-1], v, n, lt);
- }
-
- void tex_output::spline(const position &start, const position *v, int n,
- const line_type <)
- {
- if (lt.type == line_type::invisible)
- return;
- set_pen_size(lt.thickness);
- point(start);
- for (int i = 0; i < n; i++)
- point(v[i]);
- fputs(" \\special{sp", stdout);
- switch(lt.type) {
- case line_type::solid:
- break;
- case line_type::dotted:
- printf(" %.3f", -lt.dash_width/scale);
- break;
- case line_type::dashed:
- printf(" %.3f", lt.dash_width/scale);
- break;
- case line_type::invisible:
- assert(0);
- }
- fputs("}%\n", stdout);
- }
-
- void tex_output::solid_arc(const position ¢, double rad,
- double start_angle, double end_angle,
- const line_type <)
- {
- set_pen_size(lt.thickness);
- position c = transform(cent);
- printf(" \\special{ar %d %d %d %d %f %f}%%\n",
- milliinches(c.x),
- milliinches(c.y),
- milliinches(rad/scale),
- milliinches(rad/scale),
- -end_angle,
- (-end_angle > -start_angle) ? M_PI * 2 - start_angle : -start_angle);
- }
-
- void tex_output::arc(const position &start, const position ¢,
- const position &end, const line_type <)
- {
- switch (lt.type) {
- case line_type::invisible:
- break;
- case line_type::dashed:
- dashed_arc(start, cent, end, lt);
- break;
- case line_type::dotted:
- dotted_arc(start, cent, end, lt);
- break;
- case line_type::solid:
- {
- position c;
- if (!compute_arc_center(start, cent, end, &c)) {
- line(start, &end, 1, lt);
- break;
- }
- solid_arc(c,
- hypot(cent - start),
- atan2(start.y - c.y, start.x - c.x),
- atan2(end.y - c.y, end.x - c.x),
- lt);
- break;
- }
- }
- }
-
- void tex_output::circle(const position ¢, double rad,
- const line_type <, double fill)
- {
- if (fill >= 0.0 && lt.type != line_type::solid) {
- if (fill > 1.0)
- fill = 1.0;
- line_type ilt;
- ilt.type = line_type::invisible;
- ellipse(cent, position(rad*2.0, rad*2.0), ilt, fill);
- }
- switch (lt.type) {
- case line_type::dashed:
- dashed_circle(cent, rad, lt);
- break;
- case line_type::invisible:
- break;
- case line_type::solid:
- ellipse(cent, position(rad*2.0,rad*2.0), lt, fill);
- break;
- case line_type::dotted:
- dotted_circle(cent, rad, lt);
- break;
- default:
- assert(0);
- }
- }
-
- void tex_output::ellipse(const position ¢, const distance &dim,
- const line_type <, double fill)
- {
- if (lt.type == line_type::invisible) {
- if (fill < 0.0)
- return;
- }
- else
- set_pen_size(lt.thickness);
- if (fill >= 0.0) {
- if (fill > 1.0)
- fill = 1.0;
- printf(" \\special{sh %.3f}%%\n", fill);
- }
- position c = transform(cent);
- printf(" \\special{%s %d %d %d %d 0 6.28319}%%\n",
- (lt.type == line_type::invisible ? "ia" : "ar"),
- milliinches(c.x),
- milliinches(c.y),
- milliinches(dim.x/(2.0*scale)),
- milliinches(dim.y/(2.0*scale)));
- }
-
- void tex_output::command(const char *s, const char *, int)
- {
- fputs(s, stdout);
- putchar('%'); // avoid unwanted spaces
- putchar('\n');
- }
-
- int tex_output::supports_filled_polygons()
- {
- return 1;
- }
-
- void tex_output::dot(const position &pos, const line_type <)
- {
- if (zero_length_line_flag) {
- line_type slt = lt;
- slt.type = line_type::solid;
- line(pos, &pos, 1, slt);
- }
- else {
- int dot_rad = int(lt.thickness*(1000.0/(72.0*2)) + .5);
- if (dot_rad == 0)
- dot_rad = 1;
- position p = transform(pos);
- printf(" \\special{sh 1}%%\n"
- " \\special{ia %d %d %d %d 0 6.28319}%%\n",
- milliinches(p.x), milliinches(p.y), dot_rad, dot_rad);
- }
- }
-
- class tpic_output : public tex_output {
- public:
- tpic_output();
- void command(const char *, const char *, int);
- private:
- void set_pen_size(double ps);
- int default_pen_size;
- int prev_default_pen_size;
- };
-
- tpic_output::tpic_output()
- : default_pen_size(DEFAULT_PEN_SIZE), prev_default_pen_size(DEFAULT_PEN_SIZE)
- {
- }
-
- void tpic_output::command(const char *s, const char *filename, int lineno)
- {
- assert(s[0] == '.');
- if (s[1] == 'p' && s[2] == 's' && (s[3] == '\0' || !csalpha(s[3]))) {
- const char *p = s + 3;
- while (csspace(*p))
- p++;
- if (*p == '\0') {
- int temp = default_pen_size;
- default_pen_size = prev_default_pen_size;
- prev_default_pen_size = temp;
- }
- else {
- char *ptr;
- int temp = (int)strtol(p, &ptr, 10);
- if (temp == 0 && ptr == p)
- error_with_file_and_line(filename, lineno,
- "argument to `.ps' not an integer");
- else if (temp < 0)
- error_with_file_and_line(filename, lineno,
- "negative pen size");
- else {
- prev_default_pen_size = default_pen_size;
- default_pen_size = temp;
- }
- }
- }
- else
- printf("\\%s%%\n", s + 1);
- }
-
- void tpic_output::set_pen_size(double ps)
- {
- if (ps < 0.0)
- printf(" \\special{pn %d}%%\n", default_pen_size);
- else
- tex_output::set_pen_size(ps);
- }
-
- output *make_tpic_output()
- {
- return new tpic_output;
- }
-
- #endif
-