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File Content: `PelEntrySRational.php`

<?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
 */

/**
 * Classes used to manipulate rational numbers.
 *
 * @author Martin Geisler <mgeisler@users.sourceforge.net>
 * @license http://www.gnu.org/licenses/gpl.html GNU General Public
 *          License (GPL)
 * @package PEL
 */

/**
 * 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
 */
namespace lsolesen\pel;

class PelEntrySRational extends PelEntrySLong
{

    /**
     * Make a new entry that can hold a signed rational.
     *
     * @param int $tag
     *            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 $value
     *            the rational(s) that this entry will
     *            represent. The arguments passed must obey the same rules as the
     *            argument to {@link setValue}, namely that each argument should be
     *            an array with two entries, both of which must be within range of
     *            a signed long (32 bit), that is between -2147483648 and
     *            2147483647 (inclusive). If not, then a {@link
     *            PelOverflowException} will be thrown.
     */
    public function __construct($tag, $value = null)
    {
        $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 $number
     *            the rational which will be formatted.
     * @param boolean $brief
     *            not used.
     * @return string the rational formatted as a string suitable for
     *         display.
     */
    public function formatNumber($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 $brief
     *            some values can be returned in a long or more
     *            brief form, and this parameter controls that.
     * @return string the value as text.
     */
    public function getText($brief = false)
    {
        if (isset($this->value[0])) {
            $v = $this->value[0];
        } else {
            return parent::getText($brief);
        }

        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);
        }
    }
}

Name	Size	Permission
Pel.php	10753 bytes	0644
PelCanonMakerNotes.php	8958 bytes	0644
PelConvert.php	14173 bytes	0644
PelDataWindow.php	19433 bytes	0644
PelDataWindowOffsetException.php	1141 bytes	0644
PelDataWindowWindowException.php	1378 bytes	0644
PelEntry.php	7985 bytes	0644
PelEntryAscii.php	3793 bytes	0644
PelEntryByte.php	3039 bytes	0644
PelEntryCopyright.php	5324 bytes	0644
PelEntryException.php	2475 bytes	0644
PelEntryLong.php	4156 bytes	0644
PelEntryNumber.php	8694 bytes	0644
PelEntryRational.php	6221 bytes	0644
PelEntrySByte.php	3313 bytes	0644
PelEntrySLong.php	3429 bytes	0644
PelEntrySRational.php	5485 bytes	0644
PelEntrySShort.php	36714 bytes	0644
PelEntryShort.php	15184 bytes	0644
PelEntryTime.php	12303 bytes	0644
PelEntryUndefined.php	5621 bytes	0644
PelEntryUserComment.php	4104 bytes	0644
PelEntryVersion.php	5093 bytes	0644
PelEntryWindowsString.php	5663 bytes	0644
PelException.php	2044 bytes	0644
PelExif.php	4439 bytes	0644
PelFormat.php	6131 bytes	0644
PelIfd.php	56077 bytes	0644
PelIfdException.php	1426 bytes	0644
PelIllegalFormatException.php	1534 bytes	0644
PelInvalidArgumentException.php	1387 bytes	0644
PelInvalidDataException.php	1375 bytes	0644
PelJpeg.php	23082 bytes	0644
PelJpegComment.php	2762 bytes	0644
PelJpegContent.php	2262 bytes	0644
PelJpegInvalidMarkerException.php	1898 bytes	0644
PelJpegMarker.php	11789 bytes	0644
PelMakerNotes.php	2417 bytes	0644
PelMakerNotesMalformedException.php	1676 bytes	0644
PelOverflowException.php	2121 bytes	0644
PelTag.php	69462 bytes	0644
PelTiff.php	10078 bytes	0644
PelUnexpectedFormatException.php	2622 bytes	0644
PelWrongComponentCountException.php	2189 bytes	0644

File Content: PelEntrySRational.php

File Content: `PelEntrySRational.php`