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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
|
<?php
/**
* PEL: PHP Exif Library. A library with support for reading and
* writing all Exif headers in JPEG and TIFF images using PHP.
*
* Copyright (C) 2004, 2005, 2006 Martin Geisler.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program in the file COPYING; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/* $Id$ */
/**
* Classes used to manipulate rational numbers.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @version $Revision$
* @date $Date$
* @license http://www.gnu.org/licenses/gpl.html GNU General Public
* License (GPL)
* @package PEL
*/
/**#@+ Required class definitions. */
require_once('PelEntryLong.php');
/**#@-*/
/**
* Class for holding unsigned rational numbers.
*
* This class can hold rational numbers, consisting of a numerator and
* denominator both of which are of type unsigned long. Each rational
* is represented by an array with just two entries: the numerator and
* the denominator, in that order.
*
* The class can hold either just a single rational or an array of
* rationals. The class will be used to manipulate any of the Exif
* tags which can have format {@link PelFormat::RATIONAL} like in this
* example:
*
* <code>
* $resolution = $ifd->getEntry(PelTag::X_RESOLUTION);
* $resolution->setValue(array(1, 300));
* </code>
*
* Here the x-resolution is adjusted to 1/300, which will be 300 DPI,
* unless the {@link PelTag::RESOLUTION_UNIT resolution unit} is set
* to something different than 2 which means inches.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @package PEL
*/
class PelEntryRational extends PelEntryLong {
/**
* Make a new entry that can hold an unsigned rational.
*
* @param PelTag the tag which this entry represents. This should
* be one of the constants defined in {@link PelTag}, e.g., {@link
* PelTag::X_RESOLUTION}, or any other tag which can have format
* {@link PelFormat::RATIONAL}.
*
* @param array $value... the rational(s) that this entry will
* represent. The arguments passed must obey the same rules as the
* argument to {@link setValue}, namely that each argument should be
* an array with two entries, both of which must be within range of
* an unsigned long (32 bit), that is between 0 and 4294967295
* (inclusive). If not, then a {@link PelOverflowException} will be
* thrown.
*/
function __construct($tag /* $value... */) {
$this->tag = $tag;
$this->format = PelFormat::RATIONAL;
$this->dimension = 2;
$this->min = 0;
$this->max = 4294967295;
$value = func_get_args();
array_shift($value);
$this->setValueArray($value);
}
/**
* Format a rational number.
*
* The rational will be returned as a string with a slash '/'
* between the numerator and denominator.
*
* @param array the rational which will be formatted.
*
* @param boolean not used.
*
* @return string the rational formatted as a string suitable for
* display.
*/
function formatNumber($number, $brief = false) {
return $number[0] . '/' . $number[1];
}
/**
* Get the value of an entry as text.
*
* The value will be returned in a format suitable for presentation,
* e.g., rationals will be returned as 'x/y', ASCII strings will be
* returned as themselves etc.
*
* @param boolean some values can be returned in a long or more
* brief form, and this parameter controls that.
*
* @return string the value as text.
*/
function getText($brief = false) {
if (isset($this->value[0]))
$v = $this->value[0];
switch ($this->tag) {
case PelTag::FNUMBER:
//CC (e->components, 1, v);
return Pel::fmt('f/%.01f', $v[0]/$v[1]);
case PelTag::APERTURE_VALUE:
//CC (e->components, 1, v);
//if (!v_rat.denominator) return (NULL);
return Pel::fmt('f/%.01f', pow(2, $v[0]/$v[1]/2));
case PelTag::FOCAL_LENGTH:
//CC (e->components, 1, v);
//if (!v_rat.denominator) return (NULL);
return Pel::fmt('%.1f mm', $v[0]/$v[1]);
case PelTag::SUBJECT_DISTANCE:
//CC (e->components, 1, v);
//if (!v_rat.denominator) return (NULL);
return Pel::fmt('%.1f m', $v[0]/$v[1]);
case PelTag::EXPOSURE_TIME:
//CC (e->components, 1, v);
//if (!v_rat.denominator) return (NULL);
if ($v[0]/$v[1] < 1)
return Pel::fmt('1/%d sec.', $v[1]/$v[0]);
else
return Pel::fmt('%d sec.', $v[0]/$v[1]);
case PelTag::GPS_LATITUDE:
case PelTag::GPS_LONGITUDE:
$degrees = $this->value[0][0]/$this->value[0][1];
$minutes = $this->value[1][0]/$this->value[1][1];
$seconds = $this->value[2][0]/$this->value[2][1];
return sprintf('%s %s\' %s" (%.2f)',
$degrees, $minutes, $seconds,
$degrees + $minutes/60 + $seconds/3600);
default:
return parent::getText($brief);
}
}
}
/**
* Class for holding signed rational numbers.
*
* This class can hold rational numbers, consisting of a numerator and
* denominator both of which are of type unsigned long. Each rational
* is represented by an array with just two entries: the numerator and
* the denominator, in that order.
*
* The class can hold either just a single rational or an array of
* rationals. The class will be used to manipulate any of the Exif
* tags which can have format {@link PelFormat::SRATIONAL}.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @package PEL
*/
class PelEntrySRational extends PelEntrySLong {
/**
* Make a new entry that can hold a signed rational.
*
* @param PelTag the tag which this entry represents. This should
* be one of the constants defined in {@link PelTag}, e.g., {@link
* PelTag::SHUTTER_SPEED_VALUE}, or any other tag which can have
* format {@link PelFormat::SRATIONAL}.
*
* @param array $value... the rational(s) that this entry will
* represent. The arguments passed must obey the same rules as the
* argument to {@link setValue}, namely that each argument should be
* an array with two entries, both of which must be within range of
* a signed long (32 bit), that is between -2147483648 and
* 2147483647 (inclusive). If not, then a {@link
* PelOverflowException} will be thrown.
*/
function __construct($tag /* $value... */) {
$this->tag = $tag;
$this->format = PelFormat::SRATIONAL;
$this->dimension = 2;
$this->min = -2147483648;
$this->max = 2147483647;
$value = func_get_args();
array_shift($value);
$this->setValueArray($value);
}
/**
* Format a rational number.
*
* The rational will be returned as a string with a slash '/'
* between the numerator and denominator. Care is taken to display
* '-1/2' instead of the ugly but mathematically equivalent '1/-2'.
*
* @param array the rational which will be formatted.
*
* @param boolean not used.
*
* @return string the rational formatted as a string suitable for
* display.
*/
function formatNumber($number, $brief = false) {
if ($number[1] < 0)
/* Turn output like 1/-2 into -1/2. */
return (-$number[0]) . '/' . (-$number[1]);
else
return $number[0] . '/' . $number[1];
}
/**
* Get the value of an entry as text.
*
* The value will be returned in a format suitable for presentation,
* e.g., rationals will be returned as 'x/y', ASCII strings will be
* returned as themselves etc.
*
* @param boolean some values can be returned in a long or more
* brief form, and this parameter controls that.
*
* @return string the value as text.
*/
function getText($brief = false) {
if (isset($this->value[0]))
$v = $this->value[0];
switch ($this->tag) {
case PelTag::SHUTTER_SPEED_VALUE:
//CC (e->components, 1, v);
//if (!v_srat.denominator) return (NULL);
return Pel::fmt('%.0f/%.0f sec. (APEX: %d)',
$v[0], $v[1], pow(sqrt(2), $v[0]/$v[1]));
case PelTag::BRIGHTNESS_VALUE:
//CC (e->components, 1, v);
//
// TODO: figure out the APEX thing, or remove this so that it is
// handled by the default clause at the bottom.
return sprintf('%d/%d', $v[0], $v[1]);
//FIXME: How do I calculate the APEX value?
case PelTag::EXPOSURE_BIAS_VALUE:
//CC (e->components, 1, v);
//if (!v_srat.denominator) return (NULL);
return sprintf('%s%.01f', $v[0]*$v[1] > 0 ? '+' : '', $v[0]/$v[1]);
default:
return parent::getText($brief);
}
}
}
|
