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197 lines
5.2 KiB
C++
197 lines
5.2 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "eqn.h"
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#include "pbox.h"
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class over_box : public box {
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private:
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int reduce_size;
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box *num;
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box *den;
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public:
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over_box(int small, box *, box *);
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~over_box();
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void debug_print();
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int compute_metrics(int);
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void output();
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void check_tabs(int);
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};
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box *make_over_box(box *pp, box *qq)
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{
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return new over_box(0, pp, qq);
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}
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box *make_small_over_box(box *pp, box *qq)
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{
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return new over_box(1, pp, qq);
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}
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over_box::over_box(int is_small, box *pp, box *qq)
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: num(pp), den(qq), reduce_size(is_small)
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{
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spacing_type = INNER_TYPE;
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}
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over_box::~over_box()
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{
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delete num;
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delete den;
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}
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int over_box::compute_metrics(int style)
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{
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if (reduce_size) {
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style = script_style(style);
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printf(".nr " SIZE_FORMAT " \\n[.s]\n", uid);
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set_script_size();
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printf(".nr " SMALL_SIZE_FORMAT " \\n[.s]\n", uid);
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}
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int mark_uid;
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int res = num->compute_metrics(style);
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if (res)
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mark_uid = num->uid;
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int r = den->compute_metrics(cramped_style(style));
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if (r && res)
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error("multiple marks and lineups");
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else {
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mark_uid = den->uid;
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res = r;
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}
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if (reduce_size)
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printf(".ps \\n[" SIZE_FORMAT "]\n", uid);
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printf(".nr " WIDTH_FORMAT " (\\n[" WIDTH_FORMAT "]>?\\n[" WIDTH_FORMAT "]",
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uid, num->uid, den->uid);
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// allow for \(ru being wider than both the numerator and denominator
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if (!draw_flag)
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fputs(">?\\w" DELIMITER_CHAR "\\(ru" DELIMITER_CHAR, stdout);
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printf(")+%dM\n", null_delimiter_space*2 + over_hang*2);
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// 15b
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printf(".nr " SUP_RAISE_FORMAT " %dM\n",
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uid, (reduce_size ? num2 : num1));
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printf(".nr " SUB_LOWER_FORMAT " %dM\n",
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uid, (reduce_size ? denom2 : denom1));
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// 15d
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printf(".nr " SUP_RAISE_FORMAT " +(\\n[" DEPTH_FORMAT
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"]-\\n[" SUP_RAISE_FORMAT "]+%dM+(%dM/2)+%dM)>?0\n",
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uid, num->uid, uid, axis_height, default_rule_thickness,
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default_rule_thickness*(reduce_size ? 1 : 3));
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printf(".nr " SUB_LOWER_FORMAT " +(\\n[" HEIGHT_FORMAT
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"]-\\n[" SUB_LOWER_FORMAT "]-%dM+(%dM/2)+%dM)>?0\n",
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uid, den->uid, uid, axis_height, default_rule_thickness,
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default_rule_thickness*(reduce_size ? 1 : 3));
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printf(".nr " HEIGHT_FORMAT " \\n[" SUP_RAISE_FORMAT "]+\\n["
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HEIGHT_FORMAT "]\n",
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uid, uid, num->uid);
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printf(".nr " DEPTH_FORMAT " \\n[" SUB_LOWER_FORMAT "]+\\n["
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DEPTH_FORMAT "]\n",
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uid, uid, den->uid);
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if (res)
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printf(".nr " MARK_REG " +(\\n[" WIDTH_FORMAT "]-\\n["
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WIDTH_FORMAT "]/2)\n", uid, mark_uid);
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return res;
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}
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#define USE_Z
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void over_box::output()
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{
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if (reduce_size)
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printf("\\s[\\n[" SMALL_SIZE_FORMAT "]]", uid);
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#ifdef USE_Z
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printf("\\Z" DELIMITER_CHAR);
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#endif
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// move up to the numerator baseline
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printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid);
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// move across so that it's centered
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printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u'",
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uid, num->uid);
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// print the numerator
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num->output();
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#ifdef USE_Z
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printf(DELIMITER_CHAR);
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#else
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// back again
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printf("\\h'-\\n[" WIDTH_FORMAT "]u'", num->uid);
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printf("\\h'-(\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u)'",
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uid, num->uid);
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// down again
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printf("\\v'\\n[" SUP_RAISE_FORMAT "]u'", uid);
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#endif
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#ifdef USE_Z
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printf("\\Z" DELIMITER_CHAR);
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#endif
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// move down to the denominator baseline
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printf("\\v'\\n[" SUB_LOWER_FORMAT "]u'", uid);
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// move across so that it's centered
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printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u'",
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uid, den->uid);
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// print the the denominator
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den->output();
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#ifdef USE_Z
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printf(DELIMITER_CHAR);
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#else
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// back again
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printf("\\h'-\\n[" WIDTH_FORMAT "]u'", den->uid);
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printf("\\h'-(\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u)'",
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uid, den->uid);
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// up again
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printf("\\v'-\\n[" SUB_LOWER_FORMAT "]u'", uid);
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#endif
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if (reduce_size)
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printf("\\s[\\n[" SIZE_FORMAT "]]", uid);
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// draw the line
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printf("\\h'%dM'", null_delimiter_space);
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printf("\\v'-%dM'", axis_height);
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fputs(draw_flag ? "\\D'l" : "\\l'", stdout);
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printf("\\n[" WIDTH_FORMAT "]u-%dM",
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uid, 2*null_delimiter_space);
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fputs(draw_flag ? " 0'" : "\\&\\(ru'", stdout);
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printf("\\v'%dM'", axis_height);
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printf("\\h'%dM'", null_delimiter_space);
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}
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void over_box::debug_print()
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{
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fprintf(stderr, "{ ");
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num->debug_print();
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if (reduce_size)
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fprintf(stderr, " } smallover { ");
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else
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fprintf(stderr, " } over { ");
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den->debug_print();
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fprintf(stderr, " }");
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}
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void over_box::check_tabs(int level)
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{
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num->check_tabs(level + 1);
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den->check_tabs(level + 1);
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}
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