Subversion Repositories Applications.gtt

<?php

/*

 * This work is hereby released into the Public Domain.

 * To view a copy of the public domain dedication,

 * visit http://creativecommons.org/licenses/publicdomain/ or send a letter to

 * Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

 *

 */

require_once dirname(__FILE__)."/Image.class.php";

/**

 * AntiSpam

 * String printed on the images are case insensitive.

 *

 * @package Artichow

 */

class awAntiSpam extends awImage {

	/**

	 * Anti-spam string

	 *

	 * @var string

	 */

	protected $string;

	/**

	 * Noise intensity

	 *

	 * @var int

	 */

	protected $noise = 0;

	/**

	 * Construct a new awAntiSpam image

	 *

	 * @param string $string A string to display

	 */

	public function __construct($string = '') {

		parent::__construct();

		$this->string = (string)$string;

	}

	/**

	 * Create a random string

	 *

	 * @param int $length String length

	 * @return string String created

	 */

	public function setRand($length) {

		$length = (int)$length;

		$this->string = '';

		$letters = 'aAbBCDeEFgGhHJKLmMnNpPqQRsStTuVwWXYZz2345679';

		$number = strlen($letters);

		for($i = 0; $i < $length; $i++) {

			$this->string .= $letters{mt_rand(0, $number - 1)};

		}

		return $this->string;

	}

	/**

	 * Set noise on image

	 *

	 * @param int $nois Noise intensity (from 0 to 10)

	 */

	public function setNoise($noise) {

		if($noise < 0) {

			$noise = 0;

		}

		if($noise > 10) {

			$noise = 10;

		}

		$this->noise = (int)$noise;

	}

	/**

	 * Save string value in session

	 * You can use check() to verify the value later

	 *

	 * @param string $qName A name that identify the anti-spam image

	 */

	public function save($qName) {

		$this->session();

		$session = 'artichow_'.(string)$qName;

		$_SESSION[$session] = $this->string;

	}

	/**

	 * Verify user entry

	 *

	 * @param string $qName A name that identify the anti-spam image

	 * @param string $value User-defined value

	 * @param bool $case TRUE for case insensitive check, FALSE for case sensitive check ? (default to TRUE)

	 * @return bool TRUE if the value is correct, FALSE otherwise

	 */

	public function check($qName, $value, $case = TRUE) {

		$this->session();

		$session = 'artichow_'.(string)$qName;

		return (

			array_key_exists($session, $_SESSION) === TRUE and

			$case ?

				(strtolower($_SESSION[$session]) === strtolower((string)$value)) :

				($_SESSION[$session] === (string)$value)

		);

	}

	/**

	 * Draw image

	 */

	public function draw() {

		$fonts = array(

			'Tuffy',

			'TuffyBold',

			'TuffyItalic',

			'TuffyBoldItalic'

		);

		$sizes = array(12, 12.5, 13, 13.5, 14, 15, 16, 17, 18, 19);

		$widths = array();

		$heights = array();

		$texts = array();

		// Set up a temporary driver to allow font size calculations...

		$this->setSize(10, 10);

		$driver = $this->getDriver();

		for($i = 0; $i < strlen($this->string); $i++) {

			$fontKey = array_rand($fonts);

			$sizeKey = array_rand($sizes);

			$font = new awTTFFont(

				$fonts[$fontKey], $sizes[$sizeKey]

			);

			$text = new awText(

				$this->string{$i},

				$font,

				NULL,

				mt_rand(-15, 15)

			);

			$widths[] = $driver->getTextWidth($text);

			$heights[] = $driver->getTextHeight($text);

			$texts[] = $text;

		}

		// ... and get rid of it.

		$this->driver = NULL;

		$width = array_sum($widths);

		$height = array_max($heights);

		$totalWidth = $width + 10 + count($texts) * 10;

		$totalHeight = $height + 20;

		$this->setSize($totalWidth, $totalHeight);

		$this->create();

		for($i = 0; $i < strlen($this->string); $i++) {

			$this->driver->string(

				$texts[$i],

				new awPoint(

					5 + array_sum(array_slice($widths, 0, $i)) + $widths[$i] / 2 + $i * 10,

					10 + ($height - $heights[$i]) / 2

				)

			);

		}

		$this->drawNoise($totalWidth, $totalHeight);

		$this->send();

	}

	protected function drawNoise($width, $height) {

		$points = $this->noise * 30;

		$color = new awColor(0, 0, 0);

		for($i = 0; $i < $points; $i++) {

			$this->driver->point(

				$color,

				new awPoint(

					mt_rand(0, $width),

					mt_rand(0, $height)

				)

			);

		}

	}

	protected function session() {

		// Start session if needed

		if(!session_id()) {

			session_start();

		}

	}

}

registerClass('AntiSpam');

?>