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129 lines
4.6 KiB
PHP
129 lines
4.6 KiB
PHP
<?php // $Id$
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include '../../../../config.php';
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include $CFG->dirroot."/lib/graphlib.php";
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include $CFG->dirroot."/mod/quiz/report/reportlib.php";
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function graph_get_new_colour(){
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static $colourindex = 0;
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$colours = array('red', 'green', 'yellow', 'orange', 'purple', 'black', 'maroon', 'blue', 'ltgreen', 'navy', 'ltred', 'ltltgreen', 'ltltorange', 'olive', 'gray', 'ltltred', 'ltorange', 'lime', 'ltblue', 'ltltblue');
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$colour = $colours[$colourindex];
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$colourindex++;
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if ($colourindex > (count($colours)-1)){
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$colourindex =0;
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}
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return $colour;
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}
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define('QUIZ_REPORT_MAX_PARTICIPANTS_TO_SHOW_ALL_GROUPS', 500);
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$quizid = required_param('id', PARAM_INT);
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$quiz = $DB->get_record('quiz', array('id' => $quizid));
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$course = $DB->get_record('course', array('id' => $quiz->course));
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require_login($course);
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$cm = get_coursemodule_from_instance('quiz', $quizid);
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if ($groupmode = groups_get_activity_groupmode($cm)) { // Groups are being used
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$groups = groups_get_activity_allowed_groups($cm);
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} else {
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$groups = false;
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}
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$modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
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require_capability('mod/quiz:viewreports', $modcontext);
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$line = new graph(800,600);
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$line->parameter['title'] = '';
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$line->parameter['y_label_left'] = $course->students;
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$line->parameter['x_label'] = get_string('grade');
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$line->parameter['y_label_angle'] = 90;
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$line->parameter['x_label_angle'] = 0;
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$line->parameter['x_axis_angle'] = 60;
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//following two lines seem to silence notice warnings from graphlib.php
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$line->y_tick_labels = null;
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$line->offset_relation = null;
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$line->parameter['bar_size'] = 1; // will make size > 1 to get overlap effect when showing groups
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$line->parameter['bar_spacing'] = 10; // don't forget to increase spacing so that graph doesn't become one big block of colour
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//pick a sensible number of bands depending on quiz maximum grade.
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$bands = $quiz->grade;
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while ($bands >= 20 || $bands < 10){
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if ($bands >= 50){
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$bands = $bands /5;
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} else if ($bands >= 20) {
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$bands = $bands /2;
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}
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if ($bands < 4){
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$bands = $bands * 5;
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} else if ($bands < 10){
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$bands = $bands * 2;
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}
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}
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$bandwidth = $quiz->grade / $bands;
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$bands = ceil($bands);
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$bandlabels = array();
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for ($i=0;$i < $quiz->grade;$i += $bandwidth){
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$label = quiz_format_grade($quiz, $i).' - ';
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if ($quiz->grade > $i+$bandwidth){
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$label .= quiz_format_grade($quiz, $i+$bandwidth);
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} else {
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$label .= quiz_format_grade($quiz, $quiz->grade);
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}
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$bandlabels[] = $label;
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}
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$line->x_data = $bandlabels;
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$line->y_format['allusers'] =
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array('colour' => graph_get_new_colour(), 'bar' => 'fill', 'shadow_offset' => 1, 'legend' => get_string('allparticipants'));
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$line->y_data['allusers'] = quiz_report_grade_bands($bandwidth, $bands, $quizid);
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if (array_sum($line->y_data['allusers'])>QUIZ_REPORT_MAX_PARTICIPANTS_TO_SHOW_ALL_GROUPS ||
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count($groups)>4){
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if ($groups){
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if ($currentgroup = groups_get_activity_group($cm)){
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$groups = array($currentgroup=>'');
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} else {
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$groups = false;//all participants mode
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}
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}
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}
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$line->y_order = array('allusers');
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if ($groups){
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foreach (array_keys($groups) as $group){
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$useridingroup = get_users_by_capability($modcontext, 'mod/quiz:attempt','','','','',$group,'',false);
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if ($useridingroup){
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$groupdata = quiz_report_grade_bands($bandwidth, $bands, $quizid, array_keys($useridingroup));
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if ($groupdata){
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$line->parameter['bar_size'] = 1.2;
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$line->y_data['groupusers'.$group] = $groupdata;
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//only turn on legends if there is more than one set of bars
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$line->parameter['legend'] = 'outside-top';
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$line->parameter['legend_border'] = 'black';
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$line->parameter['legend_offset'] = 4;
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$line->y_format['groupusers'.$group] =
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array('colour' => graph_get_new_colour(), 'bar' => 'fill', 'shadow_offset' => 1, 'legend' => groups_get_group_name($group));
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$line->y_order[] ='groupusers'.$group;
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}
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}
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}
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}
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$line->parameter['y_min_left'] = 0; // start at 0
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$line->parameter['y_max_left'] = max($line->y_data['allusers']);
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$line->parameter['y_decimal_left'] = 0; // 2 decimal places for y axis.
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//pick a sensible number of gridlines depending on max value on graph.
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$gridlines = max($line->y_data['allusers']);
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while ($gridlines >= 10){
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if ($gridlines >= 50){
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$gridlines = $gridlines /5;
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} else {
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$gridlines = $gridlines /2;
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}
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}
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$line->parameter['y_axis_gridlines'] = $gridlines+1;
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$line->draw();
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?>
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