mirror of
https://github.com/moodle/moodle.git
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117 lines
3.6 KiB
PHP
117 lines
3.6 KiB
PHP
<?php
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require_once('../../../../config.php');
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$id = required_param('id', PARAM_INT);
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$PAGE->set_url('/mod/feedback/item/captcha/print_captcha.php', array('id'=>$id));
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if ($id) {
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if (! $cm = get_coursemodule_from_id('feedback', $id)) {
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print_error('invalidcoursemodule');
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}
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if (! $course = $DB->get_record("course", array("id"=>$cm->course))) {
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print_error('coursemisconf');
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}
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if (! $feedback = $DB->get_record("feedback", array("id"=>$cm->instance))) {
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print_error('invalidcoursemodule');
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}
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}
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if(!isset($SESSION->feedback->item->captcha)) {
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print_error('captchanotset', 'feedback');
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}
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$height = 40;
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$charcount = $SESSION->feedback->item->captcha->charcount;
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// $fontfile = $CFG->dirroot.'/mod/feedback/item/captcha/default.ttf';
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$fontfile = $CFG->libdir.'/default.ttf';
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$ttfbox = imagettfbbox ( 30, 0, $fontfile, 'H' );//the text to measure
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$charwidth = $ttfbox[2];
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$width = $charcount * $charwidth;
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$scale = 0.3;
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$elipsesize = intval((($width + $height)/2) / 5);
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$factorX = intval($width * $scale);
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$factorY = intval($height * $scale);
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//I split the colors in three ranges
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//given are the max-min-values
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//$colors = array(80, 155, 255);
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$colors = array(array(0,40),array(50,200),array(210,255));
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//shuffle($colors);
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list($col_text1, $col_el, $col_text2) = $colors;
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//if the text is in color_1 so the elipses can be in color_2 or color_3
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//if the text is in color_2 so the elipses can be in color_1 or color_3
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//and so on.
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$textcolnum = rand(1, 3);
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//create the numbers to print out
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$nums = array();
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for($i = 0; $i < $charcount; $i++) {
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$nums[] = rand(0,9); //Ziffern von 0-
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}
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// $nums = range(0, 9);
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// shuffle($nums);
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//to draw enough elipses so I draw 0.2 * width and 0.2 * height
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//we need th colors for that
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$properties = array();
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for($x = 0; $x < $factorX; $x++) {
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for($y = 0; $y < $factorY; $y++) {
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$propobj = null;
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$propobj->x = intval($x / $scale);
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$propobj->y = intval($y / $scale);
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$propobj->red = get_random_color($col_el[0], $col_el[1]);
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$propobj->green = get_random_color($col_el[0], $col_el[1]);
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$propobj->blue = get_random_color($col_el[0], $col_el[1]);
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$properties[] = $propobj;
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}
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}
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shuffle($properties);
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// create a blank image
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$image = imagecreatetruecolor($width, $height);
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$bg = imagecolorallocate($image, 0, 0, 0);
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for($i = 0; $i < ($factorX * $factorY); $i++) {
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$propobj = $properties[$i];
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// choose a color for the ellipse
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$col_ellipse = imagecolorallocate($image, $propobj->red, $propobj->green, $propobj->blue);
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// draw the white ellipse
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imagefilledellipse($image, $propobj->x, $propobj->y, $elipsesize, $elipsesize, $col_ellipse);
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}
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$checkchar = '';
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for($i = 0; $i < $charcount; $i++) {
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$colnum = rand(1,2);
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$textcol->red = get_random_color(${'col_text'.$colnum}[0], ${'col_text'.$colnum}[1]);
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$textcol->green = get_random_color(${'col_text'.$colnum}[0], ${'col_text'.$colnum}[1]);
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$textcol->blue = get_random_color(${'col_text'.$colnum}[0], ${'col_text'.$colnum}[1]);
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$color_text = imagecolorallocate($image, $textcol->red, $textcol->green, $textcol->blue);
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$angle_text = rand(-20, 20);
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$left_text = $i * $charwidth;
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$text = $nums[$i];
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$checkchar .= $text;
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ImageTTFText ($image, 30, $angle_text, $left_text, 35, $color_text, $fontfile, $text);
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}
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$SESSION->feedback->item->captcha->checkchar = $checkchar;
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// output the picture
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header("Content-type: image/png");
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imagepng($image);
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function get_random_color($val1 = 0, $val2 = 255) {
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$min = $val1 < $val2 ? $val1 : $val2;
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$max = $val1 > $val2 ? $val1 : $val2;
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return rand($min, $max);
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}
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