home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Frozen Fish 1: Amiga
/
FrozenFish-Apr94.iso
/
bbs
/
gnu
/
groff-1.09-src.lha
/
src
/
amiga
/
groff-1.09
/
pic
/
tex.cc
< prev
next >
Wrap
C/C++ Source or Header
|
1992-08-03
|
10KB
|
412 lines
// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
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 2, 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 COPYING. If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "pic.h"
#ifdef TEX_SUPPORT
#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