X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs-website;a=blobdiff_plain;f=vendor%2Flsolesen%2Fpel%2Fsrc%2FPelEntrySRational.php;fp=vendor%2Flsolesen%2Fpel%2Fsrc%2FPelEntrySRational.php;h=f4dcb8d6974d842fbb59acd35595c30850e39303;hp=0000000000000000000000000000000000000000;hb=0bf8d09d2542548982e81a441b1f16e75873a04f;hpb=74df008bdbb3a11eeea356744f39b802369bda3c

diff --git a/vendor/lsolesen/pel/src/PelEntrySRational.php b/vendor/lsolesen/pel/src/PelEntrySRational.php
new file mode 100644
index 000000000..f4dcb8d69
--- /dev/null
+++ b/vendor/lsolesen/pel/src/PelEntrySRational.php
@@ -0,0 +1,153 @@
+<?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
+ */
+namespace lsolesen\pel;
+
+/**
+ * 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
+ */
+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 $value...
+     *            the rational(s) that this entry will
+     *            represent. The arguments passed must obey the same rules as the
+     *            argument to {@link setValue}, namely that each argument should be
+     *            an array with two entries, both of which must be within range of
+     *            a signed long (32 bit), that is between -2147483648 and
+     *            2147483647 (inclusive). If not, then a {@link
+     *            PelOverflowException} will be thrown.
+     */
+    public function __construct($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 the rational which will be formatted.
+     *
+     * @param
+     *            boolean 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] . '/' . $number[1];
+        }
+    }
+
+    /**
+     * Get the value of an entry as text.
+     *
+     * The value will be returned in a format suitable for presentation,
+     * e.g., rationals will be returned as 'x/y', ASCII strings will be
+     * returned as themselves etc.
+     *
+     * @param
+     *            boolean some values can be returned in a long or more
+     *            brief form, and this parameter controls that.
+     *
+     * @return string the value as text.
+     */
+    public function getText($brief = false)
+    {
+        if (isset($this->value[0])) {
+            $v = $this->value[0];
+        }
+
+        switch ($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);
+        }
+    }
+}