241 lines
6.1 KiB
C++
241 lines
6.1 KiB
C++
// -*- C++ -*-
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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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Written by James Clark (jjc@jclark.com)
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This file is part of groff.
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groff is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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groff is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with groff; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "driver.h"
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printer *pr = 0;
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font_pointer_list::font_pointer_list(font *f, font_pointer_list *fp)
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: p(f), next(fp)
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{
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}
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printer::printer()
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: font_table(0), nfonts(0), font_list(0)
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{
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}
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printer::~printer()
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{
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a_delete font_table;
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while (font_list) {
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font_pointer_list *tem = font_list;
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font_list = font_list->next;
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delete tem->p;
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delete tem;
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}
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if (ferror(stdout) || fflush(stdout) < 0)
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fatal("output error");
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}
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void printer::load_font(int n, const char *nm)
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{
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assert(n >= 0);
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if (n >= nfonts) {
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if (nfonts == 0) {
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nfonts = 10;
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if (nfonts <= n)
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nfonts = n + 1;
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font_table = new font *[nfonts];
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for (int i = 0; i < nfonts; i++)
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font_table[i] = 0;
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}
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else {
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font **old_font_table = font_table;
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int old_nfonts = nfonts;
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nfonts *= 2;
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if (n >= nfonts)
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nfonts = n + 1;
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font_table = new font *[nfonts];
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for (int i = 0; i < old_nfonts; i++)
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font_table[i] = old_font_table[i];
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for (i = old_nfonts; i < nfonts; i++)
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font_table[i] = 0;
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a_delete old_font_table;
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}
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}
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font *f = find_font(nm);
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font_table[n] = f;
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}
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font *printer::find_font(const char *nm)
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{
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for (font_pointer_list *p = font_list; p; p = p->next)
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if (strcmp(p->p->get_name(), nm) == 0)
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return p->p;
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font *f = make_font(nm);
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if (!f)
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fatal("sorry, I can't continue");
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font_list = new font_pointer_list(f, font_list);
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return f;
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}
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font *printer::make_font(const char *nm)
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{
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return font::load_font(nm);
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}
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void printer::end_of_line()
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{
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}
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void printer::special(char *, const environment *)
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{
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}
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void printer::draw(int, int *, int, const environment *)
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{
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}
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void printer::set_ascii_char(unsigned char c, const environment *env,
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int *widthp)
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{
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char buf[2];
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buf[0] = c;
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buf[1] = '\0';
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set_special_char(buf, env, widthp);
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}
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void printer::set_special_char(const char *nm, const environment *env,
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int *widthp)
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{
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int i = font::name_to_index(nm);
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int fn = env->fontno;
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if (fn < 0 || fn >= nfonts) {
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error("bad font position `%1'", fn);
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return;
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}
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font *f = font_table[fn];
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if (f == 0) {
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error("no font mounted at `%1'", fn);
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return;
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}
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if (!f->contains(i)) {
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if (nm[0] != '\0' && nm[1] == '\0')
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error("font `%1' does not contain ascii character `%2'",
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f->get_name(),
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nm[0]);
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else
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error("font `%1' does not contain special character `%2'",
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f->get_name(),
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nm);
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return;
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}
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int w = f->get_width(i, env->size);
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if (widthp)
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*widthp = w;
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set_char(i, f, env, w);
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}
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void printer::set_numbered_char(int num, const environment *env, int *widthp)
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{
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int i = font::number_to_index(num);
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int fn = env->fontno;
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if (fn < 0 || fn >= nfonts) {
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error("bad font position `%1'", fn);
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return;
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}
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font *f = font_table[fn];
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if (f == 0) {
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error("no font mounted at `%1'", fn);
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return;
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}
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if (!f->contains(i)) {
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error("font `%1' does not contain numbered character %2",
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f->get_name(),
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num);
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return;
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}
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int w = f->get_width(i, env->size);
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if (widthp)
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*widthp = w;
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set_char(i, f, env, w);
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}
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// This utility function adjusts the specified center of the
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// arc so that it is equidistant between the specified start
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// and end points. (p[0], p[1]) is a vector from the current
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// point to the center; (p[2], p[3]) is a vector from the
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// center to the end point. If the center can be adjusted,
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// a vector from the current point to the adjusted center is
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// stored in c[0], c[1] and 1 is returned. Otherwise 0 is
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// returned.
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#if 1
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int printer::adjust_arc_center(const int *p, double *c)
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{
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// We move the center along a line parallel to the line between
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// the specified start point and end point so that the center
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// is equidistant between the start and end point.
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// It can be proved (using Lagrange multipliers) that this will
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// give the point nearest to the specified center that is equidistant
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// between the start and end point.
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double x = p[0] + p[2]; // (x, y) is the end point
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double y = p[1] + p[3];
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double n = x*x + y*y;
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if (n != 0) {
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c[0]= double(p[0]);
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c[1] = double(p[1]);
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double k = .5 - (c[0]*x + c[1]*y)/n;
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c[0] += k*x;
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c[1] += k*y;
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return 1;
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}
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else
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return 0;
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}
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#else
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int printer::adjust_arc_center(const int *p, double *c)
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{
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int x = p[0] + p[2]; // (x, y) is the end point
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int y = p[1] + p[3];
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// Start at the current point; go in the direction of the specified
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// center point until we reach a point that is equidistant between
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// the specified starting point and the specified end point. Place
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// the center of the arc there.
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double n = p[0]*double(x) + p[1]*double(y);
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if (n > 0) {
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double k = (double(x)*x + double(y)*y)/(2.0*n);
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// (cx, cy) is our chosen center
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c[0] = k*p[0];
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c[1] = k*p[1];
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return 1;
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}
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else {
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// We would never reach such a point. So instead start at the
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// specified end point of the arc. Go towards the specified
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// center point until we reach a point that is equidistant between
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// the specified start point and specified end point. Place
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// the center of the arc there.
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n = p[2]*double(x) + p[3]*double(y);
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if (n > 0) {
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double k = 1 - (double(x)*x + double(y)*y)/(2.0*n);
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// (c[0], c[1]) is our chosen center
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c[0] = p[0] + k*p[2];
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c[1] = p[1] + k*p[3];
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return 1;
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}
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else
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return 0;
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}
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}
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#endif
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