290 lines
9.2 KiB
PHP
290 lines
9.2 KiB
PHP
<?php
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/* PEL: PHP Exif Library. A library with support for reading and
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* writing all Exif headers in JPEG and TIFF images using PHP.
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*
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* Copyright (C) 2004, 2005, 2006 Martin Geisler.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program in the file COPYING; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/* $Id: PelEntryRational.php 419 2006-02-20 16:22:36Z mgeisler $ */
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/**
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* Classes used to manipulate rational numbers.
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*
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* @author Martin Geisler <mgeisler@users.sourceforge.net>
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* @version $Revision: 419 $
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* @date $Date: 2006-02-20 17:22:36 +0100 (Mon, 20 Feb 2006) $
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* @license http://www.gnu.org/licenses/gpl.html GNU General Public
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* License (GPL)
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* @package PEL
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*/
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/**#@+ Required class definitions. */
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require_once('PelEntryLong.php');
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/**#@-*/
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/**
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* Class for holding unsigned rational numbers.
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*
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* This class can hold rational numbers, consisting of a numerator and
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* denominator both of which are of type unsigned long. Each rational
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* is represented by an array with just two entries: the numerator and
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* the denominator, in that order.
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*
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* The class can hold either just a single rational or an array of
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* rationals. The class will be used to manipulate any of the Exif
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* tags which can have format {@link PelFormat::RATIONAL} like in this
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* example:
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*
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* <code>
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* $resolution = $ifd->getEntry(PelTag::X_RESOLUTION);
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* $resolution->setValue(array(1, 300));
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* </code>
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*
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* Here the x-resolution is adjusted to 1/300, which will be 300 DPI,
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* unless the {@link PelTag::RESOLUTION_UNIT resolution unit} is set
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* to something different than 2 which means inches.
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*
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* @author Martin Geisler <mgeisler@users.sourceforge.net>
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* @package PEL
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*/
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class PelEntryRational extends PelEntryLong {
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/**
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* Make a new entry that can hold an unsigned rational.
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*
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* @param PelTag the tag which this entry represents. This should
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* be one of the constants defined in {@link PelTag}, e.g., {@link
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* PelTag::X_RESOLUTION}, or any other tag which can have format
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* {@link PelFormat::RATIONAL}.
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*
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* @param array $value... the rational(s) that this entry will
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* represent. The arguments passed must obey the same rules as the
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* argument to {@link setValue}, namely that each argument should be
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* an array with two entries, both of which must be within range of
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* an unsigned long (32 bit), that is between 0 and 4294967295
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* (inclusive). If not, then a {@link PelOverflowException} will be
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* thrown.
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*/
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function __construct($tag /* $value... */) {
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$this->tag = $tag;
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$this->format = PelFormat::RATIONAL;
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$this->dimension = 2;
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$this->min = 0;
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$this->max = 4294967295;
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$value = func_get_args();
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array_shift($value);
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$this->setValueArray($value);
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}
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/**
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* Format a rational number.
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*
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* The rational will be returned as a string with a slash '/'
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* between the numerator and denominator.
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*
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* @param array the rational which will be formatted.
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*
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* @param boolean not used.
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*
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* @return string the rational formatted as a string suitable for
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* display.
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*/
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function formatNumber($number, $brief = false) {
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return $number[0] . '/' . $number[1];
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}
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/**
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* Get the value of an entry as text.
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*
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* The value will be returned in a format suitable for presentation,
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* e.g., rationals will be returned as 'x/y', ASCII strings will be
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* returned as themselves etc.
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*
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* @param boolean some values can be returned in a long or more
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* brief form, and this parameter controls that.
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*
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* @return string the value as text.
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*/
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function getText($brief = false) {
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if (isset($this->value[0]))
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$v = $this->value[0];
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switch ($this->tag) {
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case PelTag::FNUMBER:
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//CC (e->components, 1, v);
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return Pel::fmt('f/%.01f', $v[0]/$v[1]);
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case PelTag::APERTURE_VALUE:
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//CC (e->components, 1, v);
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//if (!v_rat.denominator) return (NULL);
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return Pel::fmt('f/%.01f', pow(2, $v[0]/$v[1]/2));
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case PelTag::FOCAL_LENGTH:
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//CC (e->components, 1, v);
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//if (!v_rat.denominator) return (NULL);
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return Pel::fmt('%.1f mm', $v[0]/$v[1]);
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case PelTag::SUBJECT_DISTANCE:
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//CC (e->components, 1, v);
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//if (!v_rat.denominator) return (NULL);
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return Pel::fmt('%.1f m', $v[0]/$v[1]);
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case PelTag::EXPOSURE_TIME:
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//CC (e->components, 1, v);
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//if (!v_rat.denominator) return (NULL);
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if ($v[0]/$v[1] < 1)
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return Pel::fmt('1/%d sec.', $v[1]/$v[0]);
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else
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return Pel::fmt('%d sec.', $v[0]/$v[1]);
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case PelTag::GPS_LATITUDE:
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case PelTag::GPS_LONGITUDE:
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$degrees = $this->value[0][0]/$this->value[0][1];
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$minutes = $this->value[1][0]/$this->value[1][1];
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$seconds = $this->value[2][0]/$this->value[2][1];
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return sprintf('%s<> %s\' %s" (%.2f<EFBFBD>)',
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$degrees, $minutes, $seconds,
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$degrees + $minutes/60 + $seconds/3600);
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default:
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return parent::getText($brief);
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}
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}
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}
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/**
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* Class for holding signed rational numbers.
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*
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* This class can hold rational numbers, consisting of a numerator and
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* denominator both of which are of type unsigned long. Each rational
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* is represented by an array with just two entries: the numerator and
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* the denominator, in that order.
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*
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* The class can hold either just a single rational or an array of
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* rationals. The class will be used to manipulate any of the Exif
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* tags which can have format {@link PelFormat::SRATIONAL}.
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*
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* @author Martin Geisler <mgeisler@users.sourceforge.net>
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* @package PEL
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*/
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class PelEntrySRational extends PelEntrySLong {
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/**
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* Make a new entry that can hold a signed rational.
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*
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* @param PelTag the tag which this entry represents. This should
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* be one of the constants defined in {@link PelTag}, e.g., {@link
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* PelTag::SHUTTER_SPEED_VALUE}, or any other tag which can have
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* format {@link PelFormat::SRATIONAL}.
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*
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* @param array $value... the rational(s) that this entry will
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* represent. The arguments passed must obey the same rules as the
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* argument to {@link setValue}, namely that each argument should be
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* an array with two entries, both of which must be within range of
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* a signed long (32 bit), that is between -2147483648 and
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* 2147483647 (inclusive). If not, then a {@link
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* PelOverflowException} will be thrown.
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*/
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function __construct($tag /* $value... */) {
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$this->tag = $tag;
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$this->format = PelFormat::SRATIONAL;
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$this->dimension = 2;
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$this->min = -2147483648;
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$this->max = 2147483647;
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$value = func_get_args();
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array_shift($value);
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$this->setValueArray($value);
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}
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/**
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* Format a rational number.
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*
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* The rational will be returned as a string with a slash '/'
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* between the numerator and denominator. Care is taken to display
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* '-1/2' instead of the ugly but mathematically equivalent '1/-2'.
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*
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* @param array the rational which will be formatted.
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*
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* @param boolean not used.
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*
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* @return string the rational formatted as a string suitable for
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* display.
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*/
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function formatNumber($number, $brief = false) {
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if ($number[1] < 0)
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/* Turn output like 1/-2 into -1/2. */
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return (-$number[0]) . '/' . (-$number[1]);
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else
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return $number[0] . '/' . $number[1];
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}
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/**
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* Get the value of an entry as text.
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*
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* The value will be returned in a format suitable for presentation,
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* e.g., rationals will be returned as 'x/y', ASCII strings will be
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* returned as themselves etc.
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*
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* @param boolean some values can be returned in a long or more
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* brief form, and this parameter controls that.
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*
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* @return string the value as text.
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*/
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function getText($brief = false) {
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if (isset($this->value[0]))
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$v = $this->value[0];
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switch ($this->tag) {
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case PelTag::SHUTTER_SPEED_VALUE:
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//CC (e->components, 1, v);
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//if (!v_srat.denominator) return (NULL);
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return Pel::fmt('%.0f/%.0f sec. (APEX: %d)',
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$v[0], $v[1], pow(sqrt(2), $v[0]/$v[1]));
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case PelTag::BRIGHTNESS_VALUE:
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//CC (e->components, 1, v);
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//
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// TODO: figure out the APEX thing, or remove this so that it is
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// handled by the default clause at the bottom.
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return sprintf('%d/%d', $v[0], $v[1]);
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//FIXME: How do I calculate the APEX value?
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case PelTag::EXPOSURE_BIAS_VALUE:
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//CC (e->components, 1, v);
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//if (!v_srat.denominator) return (NULL);
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return sprintf('%s%.01f', $v[0]*$v[1] > 0 ? '+' : '', $v[0]/$v[1]);
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default:
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return parent::getText($brief);
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}
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}
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}
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?>
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