2 /* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2003
3 Free Software Foundation, Inc.
4 Written by James Clark (jjc@jclark.com)
6 This file is part of groff.
8 groff is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 groff is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with groff; see the file COPYING. If not, write to the Free Software
20 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
26 class sqrt_box : public pointer_box {
29 int compute_metrics(int style);
35 box *make_sqrt_box(box *pp)
37 return new sqrt_box(pp);
40 sqrt_box::sqrt_box(box *pp) : pointer_box(pp)
44 #define SQRT_CHAR "\\[sqrt]"
45 #define RADICAL_EXTENSION_CHAR "\\[sqrtex]"
47 #define SQRT_CHAIN "\\[sqrt\\\\n[" INDEX_REG "]]"
48 #define BAR_CHAIN "\\[sqrtex\\\\n[" INDEX_REG "]]"
50 int sqrt_box::compute_metrics(int style)
53 int r = p->compute_metrics(cramped_style(style));
54 printf(".nr " TEMP_REG " \\n[" HEIGHT_FORMAT "]+\\n[" DEPTH_FORMAT
56 p->uid, p->uid, default_rule_thickness,
57 (style > SCRIPT_STYLE ? x_height : default_rule_thickness));
58 printf(".nr " SIZE_FORMAT " \\n[.ps]\n", uid);
59 printf(".ds " SQRT_STRING_FORMAT " " SQRT_CHAR "\n", uid);
60 printf(".ds " BAR_STRING " " RADICAL_EXTENSION_CHAR "\n");
61 printf(".nr " SQRT_WIDTH_FORMAT
62 " 0\\w" DELIMITER_CHAR SQRT_CHAR DELIMITER_CHAR "\n",
64 printf(".if \\n[rst]-\\n[rsb]-%dM<\\n[" TEMP_REG "] \\{",
65 default_rule_thickness);
67 printf(".nr " INDEX_REG " 0\n"
68 ".de " TEMP_MACRO "\n"
69 ".ie c" SQRT_CHAIN " \\{"
70 ".ds " SQRT_STRING_FORMAT " " SQRT_CHAIN "\n"
71 ".ie c" BAR_CHAIN " .ds " BAR_STRING " " BAR_CHAIN "\n"
72 ".el .ds " BAR_STRING " " RADICAL_EXTENSION_CHAR "\n"
73 ".nr " SQRT_WIDTH_FORMAT
74 " 0\\w" DELIMITER_CHAR SQRT_CHAIN DELIMITER_CHAR "\n"
75 ".if \\\\n[rst]-\\\\n[rsb]-%dM<\\n[" TEMP_REG "] \\{"
76 ".nr " INDEX_REG " +1\n"
79 ".el .nr " INDEX_REG " 0-1\n"
82 uid, uid, default_rule_thickness);
84 printf(".if \\n[" INDEX_REG "]<0 \\{");
86 // Determine the maximum point size
88 printf(".nr " MAX_SIZE_REG " \\n[.ps]\n");
89 printf(".ps \\n[" SIZE_FORMAT "]u\n", uid);
90 // We define a macro that will increase the current point size
91 // until we get a radical sign that's tall enough or we reach
92 // the maximum point size.
93 printf(".de " TEMP_MACRO "\n"
94 ".nr " SQRT_WIDTH_FORMAT
95 " 0\\w" DELIMITER_CHAR "\\*[" SQRT_STRING_FORMAT "]" DELIMITER_CHAR "\n"
96 ".if \\\\n[rst]-\\\\n[rsb]-%dM<\\n[" TEMP_REG "]"
97 "&(\\\\n[.ps]<\\n[" MAX_SIZE_REG "]) \\{"
103 uid, uid, default_rule_thickness);
107 printf(".nr " SMALL_SIZE_FORMAT " \\n[.ps]\n", uid);
108 // set TEMP_REG to the amount by which the radical sign is too big
109 printf(".nr " TEMP_REG " \\n[rst]-\\n[rsb]-%dM-\\n[" TEMP_REG "]\n",
110 default_rule_thickness);
111 // If TEMP_REG is negative, the bottom of the radical sign should
112 // be -TEMP_REG above the bottom of p. If it's positive, the bottom
113 // of the radical sign should be TEMP_REG/2 below the bottom of p.
114 // This calculates the amount by which the baseline of the radical
116 printf(".nr " SUP_RAISE_FORMAT " (-\\n[" TEMP_REG "]>?(-\\n[" TEMP_REG "]/2))"
117 "-\\n[rsb]-\\n[" DEPTH_FORMAT "]\n", uid, p->uid);
118 printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]"
119 ">?(\\n[" SUP_RAISE_FORMAT "]+\\n[rst])\n",
121 printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]"
122 ">?(-\\n[" SUP_RAISE_FORMAT "]-\\n[rsb])\n",
124 // Do this last, so we don't lose height and depth information on
126 // Remember that the width of the bar might be greater than the width of p.
128 printf(".nr " TEMP_REG " "
129 "\\n[" WIDTH_FORMAT "]"
130 ">?\\w" DELIMITER_CHAR "\\*[" BAR_STRING "]" DELIMITER_CHAR "\n",
132 printf(".as " SQRT_STRING_FORMAT " "
133 "\\l'\\n[" TEMP_REG "]u\\&\\*[" BAR_STRING "]'\n",
135 printf(".nr " WIDTH_FORMAT " \\n[" TEMP_REG "]"
136 "+\\n[" SQRT_WIDTH_FORMAT "]\n",
140 printf(".nr " MARK_REG " +\\n[" SQRT_WIDTH_FORMAT "]\n", uid);
141 // the top of the bar might be higher than the top of the radical sign
142 printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]"
143 ">?(\\n[" SUP_RAISE_FORMAT "]+\\n[rst])\n",
145 // put a bit of extra space above the bar
146 printf(".nr " HEIGHT_FORMAT " +%dM\n", uid, default_rule_thickness);
147 printf(".ps \\n[" SIZE_FORMAT "]u\n", uid);
151 void sqrt_box::output()
153 printf("\\Z" DELIMITER_CHAR);
154 printf("\\s[\\n[" SMALL_SIZE_FORMAT "]u]", uid);
155 printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid);
156 printf("\\*[" SQRT_STRING_FORMAT "]", uid);
157 printf("\\s[\\n[" SIZE_FORMAT "]u]", uid);
158 printf(DELIMITER_CHAR);
160 printf("\\Z" DELIMITER_CHAR);
161 printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u"
162 "+\\n[" SQRT_WIDTH_FORMAT "]u/2u'",
165 printf(DELIMITER_CHAR);
167 printf("\\h'\\n[" WIDTH_FORMAT "]u'", uid);
170 void sqrt_box::debug_print()
172 fprintf(stderr, "sqrt { ");
174 fprintf(stderr, " }");
177 void sqrt_box::check_tabs(int level)
179 p->check_tabs(level + 1);