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extend/barcode/class/BCGupcext2.barcode.php

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+<?php
+/**
+ *--------------------------------------------------------------------
+ *
+ * Sub-Class - UPC Supplemental Barcode 2 digits
+ *
+ * Working with UPC-A, UPC-E, EAN-13, EAN-8
+ * This includes 2 digits (normaly for publications)
+ * Must be placed next to UPC or EAN Code
+ *
+ *--------------------------------------------------------------------
+ * Copyright (C) Jean-Sebastien Goupil
+ * http://www.barcodephp.com
+ */
+include_once('BCGParseException.php');
+include_once('BCGBarcode1D.php');
+include_once('BCGLabel.php');
+
+class BCGupcext2 extends BCGBarcode1D {
+    protected $codeParity = array();
+
+    /**
+     * Constructor.
+     */
+    public function __construct() {
+        parent::__construct();
+
+        $this->keys = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
+        $this->code = array(
+            '2100',     /* 0 */
+            '1110',     /* 1 */
+            '1011',     /* 2 */
+            '0300',     /* 3 */
+            '0021',     /* 4 */
+            '0120',     /* 5 */
+            '0003',     /* 6 */
+            '0201',     /* 7 */
+            '0102',     /* 8 */
+            '2001'      /* 9 */
+        );
+
+        // Parity, 0=Odd, 1=Even. Depending on ?%4
+        $this->codeParity = array(
+            array(0, 0),    /* 0 */
+            array(0, 1),    /* 1 */
+            array(1, 0),    /* 2 */
+            array(1, 1)     /* 3 */
+        );
+    }
+
+    /**
+     * Draws the barcode.
+     *
+     * @param resource $im
+     */
+    public function draw($im) {
+        // Starting Code
+        $this->drawChar($im, '001', true);
+
+        // Code
+        for ($i = 0; $i < 2; $i++) {
+            $this->drawChar($im, self::inverse($this->findCode($this->text[$i]), $this->codeParity[intval($this->text) % 4][$i]), false);
+            if ($i === 0) {
+                $this->drawChar($im, '00', false);    // Inter-char
+            }
+        }
+
+        $this->drawText($im, 0, 0, $this->positionX, $this->thickness);
+    }
+
+    /**
+     * Returns the maximal size of a barcode.
+     *
+     * @param int $w
+     * @param int $h
+     * @return int[]
+     */
+    public function getDimension($w, $h) {
+        $startlength = 4;
+        $textlength = 2 * 7;
+        $intercharlength = 2;
+
+        $w += $startlength + $textlength + $intercharlength;
+        $h += $this->thickness;
+        return parent::getDimension($w, $h);
+    }
+
+    /**
+     * Adds the default label.
+     */
+    protected function addDefaultLabel() {
+        parent::addDefaultLabel();
+
+        if ($this->defaultLabel !== null) {
+            $this->defaultLabel->setPosition(BCGLabel::POSITION_TOP);
+        }
+    }
+
+    /**
+     * Validates the input.
+     */
+    protected function validate() {
+        $c = strlen($this->text);
+        if ($c === 0) {
+            throw new BCGParseException('upcext2', 'No data has been entered.');
+        }
+
+        // Checking if all chars are allowed
+        for ($i = 0; $i < $c; $i++) {
+            if (array_search($this->text[$i], $this->keys) === false) {
+                throw new BCGParseException('upcext2', 'The character \'' . $this->text[$i] . '\' is not allowed.');
+            }
+        }
+
+        // Must contain 2 digits
+        if ($c !== 2) {
+            throw new BCGParseException('upcext2', 'Must contain 2 digits.');
+        }
+
+        parent::validate();
+    }
+
+    /**
+     * Inverses the string when the $inverse parameter is equal to 1.
+     *
+     * @param string $text
+     * @param int $inverse
+     * @return string
+     */
+    private static function inverse($text, $inverse = 1) {
+        if ($inverse === 1) {
+            $text = strrev($text);
+        }
+
+        return $text;
+    }
+}
+?>