WIP of letter avatar generator

api/src/avatar.php

@@ -0,0 +1,119 @@
+<?php
+/**
+ * EGroupware API: Creating letter avatar
+ *
+ * @link http://www.egroupware.org
+ * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
+ * @package api
+ * @subpackage avatar
+ * @author Hadi Nategh <hn@egroupware.de>
+ * @version $Id$
+ */
+
+namespace EGroupware\Api;
+
+/**
+ * Creating letter avatar
+ *
+ * lavatar class designed for creating avatar image from given
+ * user firstname.lastname and outputs them as in image consist of
+ * first letter of the firstname plus first letter of the lastname.
+ */
+class avatar
+{
+	// background colors
+	private static $BG_COLORS = array(
+		array(90,135,112), array(178,183,187), array(111,169,171), array(245,175,41),
+		array(0,136,185), array(241,134,54), array(217,58,55), array(166,177,46),
+		array(0,136,185), array(241,134,54), array(217,58,55), array(166,177,46),
+		array(92,155,188), array(245,136,141), array(154,137,181), array(64,120,135),
+		array(154,137,181),array(90,135,112), array(211,63,51),	array(162,176,31),
+		array(240,177,38),array(0,135,191), array(241,134,54), array(0,135,191),
+		array(178,183,187),array(114,172,174), array(156,138,180), array(90,135,112),
+		array(238,180,36),array(64,120,135)
+	);
+
+	// ratio of font size to size
+	private static $_FONT_SIZE_RATIO = 3.2;
+
+	// ratio of text Y position to size
+	private static $_TEXT_Y_RATIO = 1.6;
+
+	private static $_TEXT_COLOR = array (255, 255, 255);
+	// font path
+	private static $_FONT_PATH = EGW_SERVER_ROOT.'/api/templates/default/fonts/arial.ttf';
+
+	public function __construct() {
+	}
+
+	/**
+	 * Function to generate letter avatar image out of given
+	 * user firstname and lastname.
+	 *
+	 * @param array $_content = null an array of firstname lastname
+	 *	example:
+	 *		array (
+	 *			'firstname' => [userFirstname],
+	 *			'lastname'  => [userLastname],
+	 *		)
+	 * @param array $_color = null an array of RGB color, default
+	 * is nul to get a random color from color library.
+	 *	example: white color
+	 *		array (
+	 *			0, // RED
+	 *			0, // GREEN
+	 *			0  // BLUE
+	 *		)
+	 * @param int $_size = 128 image size, default size is 128
+	 */
+	public static function lavatar ($_content = null, $_color = null, $_size = 128)
+	{
+		// firstname
+		$firstname = isset($_content['firstname'])? $_content['firstname'] : '';
+		//lastname
+		$lastname = isset($_content['lastname'])? $_content['lastname'] : '';
+
+		$bg_index = rand(0, count(self::$BG_COLORS));
+		// Array of RGB color as background color
+		$bgcolor = $_color ? $_color : self::$BG_COLORS[$bg_index];
+
+		// Letters to be shown
+		$text = $firstname[0].$lastname[0];
+
+		//create an image
+		$image = imagecreatetruecolor($_size, $_size);
+
+		// allocate an image color as background color
+		$bg = imagecolorallocate($image, $bgcolor[0], $bgcolor[1], $bgcolor[2]);
+
+		// allocate an image color as textcolor
+		$textcolor = imagecolorallocate($image, self::$_TEXT_COLOR[0],self::$_TEXT_COLOR[1],self::$_TEXT_COLOR[2]);
+
+		// create a rectangle
+		imagefilledrectangle($image, 0, 0, $_size, $_size, $bg);
+
+		$fontsize = $_size / self::$_FONT_SIZE_RATIO;
+
+		$box = imagettfbbox($fontsize, 0, self::$_FONT_PATH, $text);
+
+		$x = floor(($_size - ($box[2] - $box[0]))/2);
+
+		$y = floor ($_size / self::$_TEXT_Y_RATIO);
+
+		// write a ttf text
+		$ttf = imagettftext($image,	$fontsize, 0, $x, $y, $textcolor, self::$_FONT_PATH, $text);
+		if ($ttf)
+		{
+			ob_start();
+			imagejpeg($image, null,100);
+			$result = ob_get_contents();
+			ob_clean();
+			imagedestroy($image);
+			return $result;
+		}
+		else
+		{
+			imagedestroy($image);
+		}
+	}
+}