See Release Notes
Long Term Support Release
Differences Between: [Versions 310 and 401] [Versions 311 and 401] [Versions 39 and 401] [Versions 400 and 401]
1 <?php 2 // This file is part of Moodle - http://moodle.org/ 3 // 4 // Moodle is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // Moodle is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 // 14 // You should have received a copy of the GNU General Public License 15 // along with Moodle. If not, see <http://www.gnu.org/licenses/>. 16 17 require_once('../../../../config.php'); 18 19 $id = required_param('id', PARAM_INT); 20 21 $PAGE->set_url('/mod/feedback/item/captcha/print_captcha.php', array('id'=>$id)); 22 23 if ($id) { 24 if (! $cm = get_coursemodule_from_id('feedback', $id)) { 25 throw new \moodle_exception('invalidcoursemodule'); 26 } 27 28 if (! $course = $DB->get_record("course", array("id"=>$cm->course))) { 29 throw new \moodle_exception('coursemisconf'); 30 } 31 32 if (! $feedback = $DB->get_record("feedback", array("id"=>$cm->instance))) { 33 throw new \moodle_exception('invalidcoursemodule'); 34 } 35 } 36 37 if (!isset($SESSION->feedback->item->captcha)) { 38 throw new \moodle_exception('captchanotset', 'feedback'); 39 } 40 41 $height = 40; 42 $charcount = $SESSION->feedback->item->captcha->charcount; 43 $fontfile = $CFG->libdir.'/default.ttf'; 44 45 $ttfbox = imagettfbbox ( 30, 0, $fontfile, 'H' );//the text to measure 46 $charwidth = $ttfbox[2]; 47 48 $width = $charcount * $charwidth; 49 50 $scale = 0.3; 51 $elipsesize = intval((($width + $height)/2) / 5); 52 $factor_x = intval($width * $scale); 53 $factor_y = intval($height * $scale); 54 55 //I split the colors in three ranges 56 //given are the max-min-values 57 $colors = array(array(0, 40), array(50, 200), array(210, 255)); 58 list($col_text1, $col_el, $col_text2) = $colors; 59 60 //if the text is in color_1 so the elipses can be in color_2 or color_3 61 //if the text is in color_2 so the elipses can be in color_1 or color_3 62 //and so on. 63 $textcolnum = rand(1, 3); 64 65 //create the numbers to print out 66 $nums = array(); 67 for ($i = 0; $i < $charcount; $i++) { 68 $nums[] = rand(0, 9); //Ziffern von 0- 69 } 70 71 //to draw enough elipses so I draw 0.2 * width and 0.2 * height 72 //we need th colors for that 73 $properties = array(); 74 for ($x = 0; $x < $factor_x; $x++) { 75 for ($y = 0; $y < $factor_y; $y++) { 76 $propobj = new stdClass(); 77 $propobj->x = intval($x / $scale); 78 $propobj->y = intval($y / $scale); 79 $propobj->red = get_random_color($col_el[0], $col_el[1]); 80 $propobj->green = get_random_color($col_el[0], $col_el[1]); 81 $propobj->blue = get_random_color($col_el[0], $col_el[1]); 82 $properties[] = $propobj; 83 } 84 } 85 shuffle($properties); 86 87 // create a blank image 88 $image = imagecreatetruecolor($width, $height); 89 $bg = imagecolorallocate($image, 0, 0, 0); 90 for ($i = 0; $i < ($factor_x * $factor_y); $i++) { 91 $propobj = $properties[$i]; 92 // choose a color for the ellipse 93 $col_ellipse = imagecolorallocate($image, $propobj->red, $propobj->green, $propobj->blue); 94 // draw the white ellipse 95 imagefilledellipse($image, $propobj->x, $propobj->y, $elipsesize, $elipsesize, $col_ellipse); 96 } 97 98 $checkchar = ''; 99 for ($i = 0; $i < $charcount; $i++) { 100 $colnum = rand(1, 2); 101 $textcol = new stdClass(); 102 $textcol->red = get_random_color(${'col_text'.$colnum}[0], ${'col_text'.$colnum}[1]); 103 $textcol->green = get_random_color(${'col_text'.$colnum}[0], ${'col_text'.$colnum}[1]); 104 $textcol->blue = get_random_color(${'col_text'.$colnum}[0], ${'col_text'.$colnum}[1]); 105 $color_text = imagecolorallocate($image, $textcol->red, $textcol->green, $textcol->blue); 106 $angle_text = rand(-20, 20); 107 $left_text = $i * $charwidth; 108 $text = $nums[$i]; 109 $checkchar .= $text; 110 imagettftext($image, 30, $angle_text, $left_text, 35, $color_text, $fontfile, $text); 111 } 112 113 $SESSION->feedback->item->captcha->checkchar = $checkchar; 114 115 // output the picture 116 header("Content-type: image/png"); 117 imagepng($image); 118 119 function get_random_color($val1 = 0, $val2 = 255) { 120 $min = $val1 < $val2 ? $val1 : $val2; 121 $max = $val1 > $val2 ? $val1 : $val2; 122 123 return rand($min, $max); 124 }
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