Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle 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 3 of the License, or

// (at your option) any later version.

//

// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * moodle_image class

 *

 * @package    repository

 * @subpackage flickr_public

 * @author     Dongsheng Cai <dongsheng@moodle.com>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU Public License

 */

class moodle_image {

    private $imagepath;

    private $info;

    private $width;

    private $height;

    private $image;

    private $backup;

    function __construct($img) {

        ini_set('gd.jpeg_ignore_warning', 1);

        if(!function_exists('imagecreatefrompng')

            and !function_exists('imagecreatefromjpeg')) {

            throw new moodle_exception('gdnotexist');

        }

        if(!file_exists($img) or !is_readable($img)) {

            throw new moodle_exception('invalidfile');

        }

        $this->imagepath = $img;

        unset($img);

        $this->info = getimagesize($this->imagepath);

        switch($this->info['mime']) {

        case 'image/jpeg':

            $this->image = imagecreatefromjpeg($this->imagepath);

            break;

        case 'image/png':

            $this->image = imagecreatefrompng($this->imagepath);

            break;

        case 'image/gif':

            $this->image = imagecreatefromgif($this->imagepath);

            break;

        default:

            break;

        }

        $this->width  = imagesx($this->image);

        $this->height = imagesy($this->image);

    }

    function destroy() {

         imagedestroy($this->image);

         imagedestroy($this->backup);

         return true;

    }

    function undo() {

        $this->image = $this->backup;

        return $this;

    }

    function watermark($text='', $pos=array(), $options=array()) {

        global $CFG;

        $text = iconv('ISO-8859-8', 'UTF-8', $text);

        if (empty($options['fontsize'])) {

            if (!empty($options['ttf'])) {

                $options['fontsize'] = 12;

            } else {

                $options['fontsize'] = 1;

            }

        }

        if (empty($options['font'])) {

            $options['font'] = $CFG->libdir . '/default.ttf';

        }

        if (empty($options['angle'])) {

            $options['angle'] = 0;

        }

        $clr = imagecolorallocate($this->image, 255, 255, 255);

        if (!empty($options['ttf'])) {

            imagettftext($this->image,

                $options['fontsize'],        // font size

                $options['angle'],

                $pos[0],

                $pos[1]+$options['fontsize'],

                $clr,

                $options['font'],

                $text);

        } else {

            imagestring($this->image, $options['fontsize'], $pos[0], $pos[1], $text, $clr);

        }

        return $this;

    }

    function rotate($angle=0, $bgcolor=0) {

        $this->image = imagerotate($this->image, $angle, $bgcolor);

        return $this;

    }

    function resize($w, $h, $use_resize = true) {

        if(empty($h) && !empty($w)) {

            $h = $this->height * ($w/$this->width);

        }

        if(!empty($h) && empty($w)) {

            $w = $this->width  * ($h/$this->height);

        }

        $new_img = imagecreatetruecolor($w, $h);

        imagealphablending($new_img, false);

        imagecopyresampled($new_img /* dst */, $this->image /* src */, 0, 0, 0, 0, $w, $h, $this->width, $this->height);

        $this->image = $new_img;

        return $this;

    }

    function saveas($imagepath) {

        switch($this->info['mime']) {

        case 'image/jpeg':

            return imagejpeg($this->image, $imagepath);

            break;

        case 'image/png':

            return imagepng($this->image, $imagepath);

            break;

        case 'image/gif':

            return imagegif($this->image, $imagepath);

            break;

        default:

            break;

        }

        if(!$this->destroy()) {

            return false;

        } else {

            return $this;

        }

    }

    function display() {

        header('Content-type: '.$this->info['mime']);

        switch($this->info['mime']) {

        case 'image/png':

            imagepng($this->image);

            break;

        case 'image/jpeg':

            imagejpeg($this->image);

            break;

        case 'image/gif':

            imagegif($this->image);

            break;

        default:

            break;

        }

        $this->destroy();

        return $this;

    }

}