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