1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* DelimiterFactory.java
* =========================================================================
* This file is part of the JMathTeX Library - http://jmathtex.sourceforge.net
*
* Copyright (C) 2004-2007 Universiteit Gent
*
* This program 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 of the License, or (at
* your option) any later version.
*
* This program 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.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
package be.ugent.caagt.jmathtex; // NOPMD
/**
* Responsible for creating a box containing a delimiter symbol that exists
* in different sizes.
*/
class DelimiterFactory {
/**
*
* @param symbol the name of the delimiter symbol
* @param env the TeXEnvironment in which to create the delimiter box
* @param minHeight the minimum required total height of the box (height + depth).
* @return the box representing the delimiter variant that fits best according to
* the required minimum size.
*/
public static Box create(String symbol, TeXEnvironment env, float minHeight) {
TeXFont tf = env.getTeXFont();
int style = env.getStyle();
Char c = tf.getChar(symbol, style);
// start with smallest character
Metrics m = c.getMetrics();
float total = m.getHeight() + m.getDepth();
// try larger versions of the same character until minHeight has been
// reached
while (total < minHeight && tf.hasNextLarger(c)) {
c = tf.getNextLarger(c, style);
m = c.getMetrics();
total = m.getHeight() + m.getDepth();
}
if (total >= minHeight) { // tall enough character found
return new CharBox(c);
} else if (tf.isExtensionChar(c)) {
// construct tall enough vertical box
VerticalBox vBox = new VerticalBox();
Extension ext = tf.getExtension(c, style); // extension info
if (ext.hasTop()) { // insert top part
c = ext.getTop();
vBox.add(new CharBox(c));
}
boolean middle = ext.hasMiddle();
if (middle) { // insert middle part
c = ext.getMiddle();
vBox.add(new CharBox(c));
}
if (ext.hasBottom()) { // insert bottom part
c = ext.getBottom();
vBox.add(new CharBox(c));
}
// insert repeatable part until tall enough
c = ext.getRepeat();
CharBox rep = new CharBox(c);
do {
if (ext.hasTop() && ext.hasBottom()) {
vBox.add(1, rep);
if (middle)
vBox.add(vBox.getSize() - 1, rep);
} else if (ext.hasBottom())
vBox.add(0, rep);
else
vBox.add(rep);
} while (vBox.getHeight() + vBox.getDepth() < minHeight);
return vBox;
} else
// no extensions, so return tallest possible character
return new CharBox(c);
}
}
|
