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graph.php
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graph.php
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<?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/>.
/**
* This file is responsible for producing the graph for survey reports
*
* @package mod_survey
* @copyright 2021 Sujith Haridasan <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once("../../config.php");
require_once("$CFG->libdir/graphlib.php");
require_once("lib.php");
$id = required_param('id', PARAM_INT); // Course Module ID.
$type = required_param('type', PARAM_FILE); // Graph Type.
$group = optional_param('group', 0, PARAM_INT); // Group ID.
$sid = optional_param('sid', false, PARAM_INT); // Student ID.
$qid = optional_param('qid', 0, PARAM_INT); // Group ID.
$url = new moodle_url('/mod/survey/graph.php', array('id' => $id, 'type' => $type));
if ($group !== 0) {
$url->param('group', $group);
}
if ($sid !== false) {
$url->param('sid', $sid);
}
if ($qid !== 0) {
$url->param('qid', $qid);
}
$PAGE->set_url($url);
if (!$cm = get_coursemodule_from_id('survey', $id)) {
throw new \moodle_exception('invalidcoursemodule');
}
if (!$course = $DB->get_record("course", array("id" => $cm->course))) {
throw new \moodle_exception('coursemisconf');
}
if ($sid) {
if (!$user = $DB->get_record("user", array("id" => $sid))) {
throw new \moodle_exception('invaliduserid');
}
}
require_login($course, false, $cm);
$groupmode = groups_get_activity_groupmode($cm); // Groups are being used.
$context = context_module::instance($cm->id);
if (!has_capability('mod/survey:readresponses', $context)) {
if ($type != "student.png" or $sid != $USER->id) {
throw new \moodle_exception('nopermissiontoshow');
} else if ($groupmode and !groups_is_member($group)) {
throw new \moodle_exception('nopermissiontoshow');
}
}
if (!$survey = $DB->get_record("survey", array("id" => $cm->instance))) {
throw new \moodle_exception('invalidsurveyid', 'survey');
}
// Check to see if groups are being used in this survey.
if ($group) {
$users = get_users_by_capability($context, 'mod/survey:participate', '', '', '', '', $group, null, false);
} else if (!empty($cm->groupingid)) {
$groups = groups_get_all_groups($courseid, 0, $cm->groupingid);
$groups = array_keys($groups);
$users = get_users_by_capability($context, 'mod/survey:participate', '', '', '', '', $groups, null, false);
} else {
$users = get_users_by_capability($context, 'mod/survey:participate', '', '', '', '', '', null, false);
$group = false;
}
$stractual = get_string("actual", "survey");
$stractualclass = get_string("actualclass", "survey");
$strpreferred = get_string("preferred", "survey");
$strpreferredclass = get_string("preferredclass", "survey");
if ($sid || isset($user)) {
$stractualstudent = get_string("actualstudent", "survey", fullname($user));
$strpreferredstudent = get_string("preferredstudent", "survey", fullname($user));
}
$virtualscales = false; // Set default value for case clauses.
switch ($type) {
case "question.png":
$question = $DB->get_record("survey_questions", array("id" => $qid));
$question->text = wordwrap(get_string($question->text, "survey"), SURVEY_QLENGTH_WRAP);
$question->options = get_string($question->options, "survey");
$options = explode(",", $question->options);
foreach ($options as $key => $unused) {
$buckets1[$key] = 0;
$buckets2[$key] = 0;
}
if ($aaa = $DB->get_records('survey_answers', array('survey' => $cm->instance, 'question' => $qid))) {
foreach ($aaa as $aa) {
if (!$group or isset($users[$aa->userid])) {
if ($a1 = $aa->answer1) {
$buckets1[$a1 - 1]++;
}
if ($a2 = $aa->answer2) {
$buckets2[$a2 - 1]++;
}
}
}
}
$maxbuckets1 = max($buckets1);
$maxbuckets2 = max($buckets2);
$maxbuckets = ($maxbuckets1 > $maxbuckets2) ? $maxbuckets1 : $maxbuckets2;
$graph = new graph($SURVEY_GWIDTH, $SURVEY_GHEIGHT);
$graph->parameter['title'] = "$question->text";
$graph->x_data = $options;
$graph->y_data['answers1'] = $buckets1;
$graph->y_format['answers1'] = array('colour' => 'ltblue', 'bar' => 'fill', 'legend' => $stractual, 'bar_size' => 0.4);
$graph->y_data['answers2'] = $buckets2;
$graph->y_format['answers2'] = array('colour' => 'ltorange', 'bar' => 'fill', 'legend' => $strpreferred, 'bar_size' => 0.2);
$graph->parameter['legend'] = 'outside-top';
$graph->parameter['legend_border'] = 'black';
$graph->parameter['legend_offset'] = 4;
if (($maxbuckets1 > 0.0) && ($maxbuckets2 > 0.0)) {
$graph->y_order = array('answers1', 'answers2');
} else if ($maxbuckets1 > 0.0) {
$graph->y_order = array('answers1');
} else {
$graph->y_order = array('answers2');
}
$graph->parameter['y_axis_gridlines'] = $maxbuckets + 1;
$graph->parameter['y_resolution_left'] = 1;
$graph->parameter['y_decimal_left'] = 0;
$graph->parameter['x_axis_angle'] = 20;
$graph->parameter['shadow'] = 'none';
$graph->y_tick_labels = null;
$graph->offset_relation = null;
$graph->draw_stack();
break;
case "multiquestion.png":
$question = $DB->get_record("survey_questions", array("id" => $qid));
$question->text = get_string($question->text, "survey");
$question->options = get_string($question->options, "survey");
$options = explode(",", $question->options);
$questionorder = explode(",", $question->multi);
$qqq = $DB->get_records_list("survey_questions", "id", explode(',', $question->multi));
foreach ($questionorder as $i => $val) {
$names[$i] = get_string($qqq["$val"]->shorttext, "survey");
$buckets1[$i] = 0;
$buckets2[$i] = 0;
$count1[$i] = 0;
$count2[$i] = 0;
$indexof[$val] = $i;
$stdev1[$i] = 0;
$stdev2[$i] = 0;
}
$aaa = $DB->get_records_select("survey_answers", "((survey = ?) AND (question in ($question->multi)))",
array($cm->instance));
if ($aaa) {
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
$index = $indexof[$a->question];
if ($a->answer1) {
$buckets1[$index] += $a->answer1;
$count1[$index]++;
}
if ($a->answer2) {
$buckets2[$index] += $a->answer2;
$count2[$index]++;
}
}
}
}
foreach ($questionorder as $i => $val) {
if ($count1[$i]) {
$buckets1[$i] = (float) $buckets1[$i] / (float) $count1[$i];
}
if ($count2[$i]) {
$buckets2[$i] = (float) $buckets2[$i] / (float) $count2[$i];
}
}
if ($aaa) {
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
$index = $indexof[$a->question];
if ($a->answer1) {
$difference = (float) ($a->answer1 - $buckets1[$index]);
$stdev1[$index] += ($difference * $difference);
}
if ($a->answer2) {
$difference = (float) ($a->answer2 - $buckets2[$index]);
$stdev2[$index] += ($difference * $difference);
}
}
}
}
foreach ($questionorder as $i => $val) {
if ($count1[$i]) {
$stdev1[$i] = sqrt((float) $stdev1[$i] / ((float) $count1[$i]));
}
if ($count2[$i]) {
$stdev2[$i] = sqrt((float) $stdev2[$i] / ((float) $count2[$i]));
}
$buckets1[$i] = $buckets1[$i] - 1;
$buckets2[$i] = $buckets2[$i] - 1;
}
$maxbuckets1 = max($buckets1);
$maxbuckets2 = max($buckets2);
$graph = new graph($SURVEY_GWIDTH, $SURVEY_GHEIGHT);
$graph->parameter['title'] = "$question->text";
$graph->x_data = $names;
$graph->y_data['answers1'] = $buckets1;
$graph->y_format['answers1'] = array('colour' => 'ltblue', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $stractual);
$graph->y_data['answers2'] = $buckets2;
$graph->y_format['answers2'] = array('colour' => 'ltorange', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $strpreferred);
$graph->y_data['stdev1'] = $stdev1;
$graph->y_format['stdev1'] = array('colour' => 'ltltblue', 'bar' => 'fill',
'shadow_offset' => '4', 'legend' => 'none', 'bar_size' => 0.3);
$graph->y_data['stdev2'] = $stdev2;
$graph->y_format['stdev2'] = array('colour' => 'ltltorange', 'bar' => 'fill',
'shadow_offset' => '4', 'legend' => 'none', 'bar_size' => 0.2);
$graph->offset_relation['stdev1'] = 'answers1';
$graph->offset_relation['stdev2'] = 'answers2';
$graph->parameter['bar_size'] = 0.15;
$graph->parameter['legend'] = 'outside-top';
$graph->parameter['legend_border'] = 'black';
$graph->parameter['legend_offset'] = 4;
$graph->y_tick_labels = $options;
if (($maxbuckets1 > 0.0) && ($maxbuckets2 > 0.0)) {
$graph->y_order = array('stdev1', 'answers1', 'stdev2', 'answers2');
} else if ($maxbuckets1 > 0.0) {
$graph->y_order = array('stdev1', 'answers1');
} else {
$graph->y_order = array('stdev2', 'answers2');
}
$graph->parameter['y_max_left'] = count($options) - 1;
$graph->parameter['y_axis_gridlines'] = count($options);
$graph->parameter['y_resolution_left'] = 1;
$graph->parameter['y_decimal_left'] = 1;
$graph->parameter['x_axis_angle'] = 20;
$graph->draw();
break;
case "overall.png":
$qqq = $DB->get_records_list("survey_questions", "id", explode(',', $survey->questions));
foreach ($qqq as $key => $qq) {
if ($qq->multi) {
$qqq[$key]->text = get_string($qq->text, "survey");
$qqq[$key]->options = get_string($qq->options, "survey");
if ($qq->type < 0) {
$virtualscales = true;
}
}
}
foreach ($qqq as $qq) { // If any virtual, then use JUST virtual, else use JUST nonvirtual.
if ($qq->multi) {
if ($virtualscales && $qq->type < 0) {
$question[] = $qq;
} else if (!$virtualscales && $qq->type > 0) {
$question[] = $qq;
}
}
}
$numquestions = count($question);
$options = explode(",", $question[0]->options);
$numoptions = count($options);
for ($i = 0; $i < $numquestions; $i++) {
$names[$i] = $question[$i]->text;
$buckets1[$i] = 0.0;
$buckets2[$i] = 0.0;
$stdev1[$i] = 0.0;
$stdev2[$i] = 0.0;
$count1[$i] = 0;
$count2[$i] = 0;
$subquestions = $question[$i]->multi; // Otherwise next line doesn't work.
$aaa = $DB->get_records_select("survey_answers", "((survey = ?) AND (question in ($subquestions)))",
array($cm->instance));
if ($aaa) {
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
if ($a->answer1) {
$buckets1[$i] += $a->answer1;
$count1[$i]++;
}
if ($a->answer2) {
$buckets2[$i] += $a->answer2;
$count2[$i]++;
}
}
}
}
if ($count1[$i]) {
$buckets1[$i] = (float) $buckets1[$i] / (float) $count1[$i];
}
if ($count2[$i]) {
$buckets2[$i] = (float) $buckets2[$i] / (float) $count2[$i];
}
// Calculate the standard devaiations.
if ($aaa) {
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
if ($a->answer1) {
$difference = (float) ($a->answer1 - $buckets1[$i]);
$stdev1[$i] += ($difference * $difference);
}
if ($a->answer2) {
$difference = (float) ($a->answer2 - $buckets2[$i]);
$stdev2[$i] += ($difference * $difference);
}
}
}
}
if ($count1[$i]) {
$stdev1[$i] = sqrt((float) $stdev1[$i] / ((float) $count1[$i]));
}
if ($count2[$i]) {
$stdev2[$i] = sqrt((float) $stdev2[$i] / ((float) $count2[$i]));
}
$buckets1[$i] = $buckets1[$i] - 1; // Hack because there should not be ANY 0 values in the data.
$buckets2[$i] = $buckets2[$i] - 1;
}
$maxbuckets1 = max($buckets1);
$maxbuckets2 = max($buckets2);
$graph = new graph($SURVEY_GWIDTH, $SURVEY_GHEIGHT);
$graph->parameter['title'] = strip_tags(format_string($survey->name, true));
$graph->x_data = $names;
$graph->y_data['answers1'] = $buckets1;
$graph->y_format['answers1'] = array('colour' => 'ltblue', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $stractual);
$graph->y_data['answers2'] = $buckets2;
$graph->y_format['answers2'] = array('colour' => 'ltorange', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $strpreferred);
$graph->y_data['stdev1'] = $stdev1;
$graph->y_format['stdev1'] = array('colour' => 'ltltblue', 'bar' => 'fill',
'shadow_offset' => '4', 'legend' => 'none', 'bar_size' => 0.3);
$graph->y_data['stdev2'] = $stdev2;
$graph->y_format['stdev2'] = array('colour' => 'ltltorange', 'bar' => 'fill',
'shadow_offset' => '4', 'legend' => 'none', 'bar_size' => 0.2);
$graph->offset_relation['stdev1'] = 'answers1';
$graph->offset_relation['stdev2'] = 'answers2';
$graph->parameter['legend'] = 'outside-top';
$graph->parameter['legend_border'] = 'black';
$graph->parameter['legend_offset'] = 4;
$graph->y_tick_labels = $options;
if (($maxbuckets1 > 0.0) && ($maxbuckets2 > 0.0)) {
$graph->y_order = array('stdev1', 'answers1', 'stdev2', 'answers2');
} else if ($maxbuckets1 > 0.0) {
$graph->y_order = array('stdev1', 'answers1');
} else {
$graph->y_order = array('stdev2', 'answers2');
}
$graph->parameter['y_max_left'] = $numoptions - 1;
$graph->parameter['y_axis_gridlines'] = $numoptions;
$graph->parameter['y_resolution_left'] = 1;
$graph->parameter['y_decimal_left'] = 1;
$graph->parameter['x_axis_angle'] = 0;
$graph->parameter['x_inner_padding'] = 6;
$graph->draw();
break;
case "student.png":
$qqq = $DB->get_records_list("survey_questions", "id", explode(',', $survey->questions));
foreach ($qqq as $key => $qq) {
if ($qq->multi) {
$qqq[$key]->text = get_string($qq->text, "survey");
$qqq[$key]->options = get_string($qq->options, "survey");
if ($qq->type < 0) {
$virtualscales = true;
}
}
}
foreach ($qqq as $qq) { // If any virtual, then use JUST virtual, else use JUST nonvirtual.
if ($qq->multi) {
if ($virtualscales && $qq->type < 0) {
$question[] = $qq;
} else if (!$virtualscales && $qq->type > 0) {
$question[] = $qq;
}
}
}
$numquestions = count($question);
$options = explode(",", $question[0]->options);
$numoptions = count($options);
for ($i = 0; $i < $numquestions; $i++) {
$names[$i] = $question[$i]->text;
$buckets1[$i] = 0.0;
$buckets2[$i] = 0.0;
$count1[$i] = 0;
$count2[$i] = 0;
$studbuckets1[$i] = 0.0;
$studbuckets2[$i] = 0.0;
$studcount1[$i] = 0;
$studcount2[$i] = 0;
$stdev1[$i] = 0.0;
$stdev2[$i] = 0.0;
$subquestions = $question[$i]->multi; // Otherwise next line doesn't work.
$aaa = $DB->get_records_select("survey_answers", "((survey = ?) AND (question in ($subquestions)))",
array($cm->instance));
if ($aaa) {
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
if ($a->userid == $sid) {
if ($a->answer1) {
$studbuckets1[$i] += $a->answer1;
$studcount1[$i]++;
}
if ($a->answer2) {
$studbuckets2[$i] += $a->answer2;
$studcount2[$i]++;
}
}
if ($a->answer1) {
$buckets1[$i] += $a->answer1;
$count1[$i]++;
}
if ($a->answer2) {
$buckets2[$i] += $a->answer2;
$count2[$i]++;
}
}
}
}
if ($count1[$i]) {
$buckets1[$i] = (float) $buckets1[$i] / (float) $count1[$i];
}
if ($count2[$i]) {
$buckets2[$i] = (float) $buckets2[$i] / (float) $count2[$i];
}
if ($studcount1[$i]) {
$studbuckets1[$i] = (float) $studbuckets1[$i] / (float) $studcount1[$i];
}
if ($studcount2[$i]) {
$studbuckets2[$i] = (float) $studbuckets2[$i] / (float) $studcount2[$i];
}
// Calculate the standard devaiations.
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
if ($a->answer1) {
$difference = (float) ($a->answer1 - $buckets1[$i]);
$stdev1[$i] += ($difference * $difference);
}
if ($a->answer2) {
$difference = (float) ($a->answer2 - $buckets2[$i]);
$stdev2[$i] += ($difference * $difference);
}
}
}
if ($count1[$i]) {
$stdev1[$i] = sqrt((float) $stdev1[$i] / ((float) $count1[$i]));
}
if ($count2[$i]) {
$stdev2[$i] = sqrt((float) $stdev2[$i] / ((float) $count2[$i]));
}
$buckets1[$i] = $buckets1[$i] - 1; // Hack because there should not be ANY 0 values in the data.
$buckets2[$i] = $buckets2[$i] - 1;
$studbuckets1[$i] = $studbuckets1[$i] - 1;
$studbuckets2[$i] = $studbuckets2[$i] - 1;
}
$maxbuckets1 = max($buckets1);
$maxbuckets2 = max($buckets2);
$graph = new graph($SURVEY_GWIDTH, $SURVEY_GHEIGHT);
$graph->parameter['title'] = strip_tags(format_string($survey->name, true));
$graph->x_data = $names;
$graph->y_data['answers1'] = $buckets1;
$graph->y_format['answers1'] = array('colour' => 'ltblue', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 0.1, 'legend' => $stractualclass);
$graph->y_data['answers2'] = $buckets2;
$graph->y_format['answers2'] = array('colour' => 'ltorange', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 0.1, 'legend' => $strpreferredclass);
$graph->y_data['studanswers1'] = $studbuckets1;
$graph->y_format['studanswers1'] = array('colour' => 'blue', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $stractualstudent);
$graph->y_data['studanswers2'] = $studbuckets2;
$graph->y_format['studanswers2'] = array('colour' => 'orange', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $strpreferredstudent);
$graph->y_data['stdev1'] = $stdev1;
$graph->y_format['stdev1'] = array('colour' => 'ltltblue', 'bar' => 'fill',
'shadow_offset' => 0.1, 'legend' => 'none', 'bar_size' => 0.3);
$graph->y_data['stdev2'] = $stdev2;
$graph->y_format['stdev2'] = array('colour' => 'ltltorange', 'bar' => 'fill',
'shadow_offset' => 0.1, 'legend' => 'none', 'bar_size' => 0.2);
$graph->offset_relation['stdev1'] = 'answers1';
$graph->offset_relation['stdev2'] = 'answers2';
$graph->y_tick_labels = $options;
$graph->parameter['bar_size'] = 0.15;
$graph->parameter['legend'] = 'outside-top';
$graph->parameter['legend_border'] = 'black';
$graph->parameter['legend_offset'] = 4;
if (($maxbuckets1 > 0.0) && ($maxbuckets2 > 0.0)) {
$graph->y_order = array('stdev1', 'stdev2', 'answers1', 'answers2', 'studanswers1', 'studanswers2');
} else if ($maxbuckets1 > 0.0) {
$graph->y_order = array('stdev1', 'answers1', 'studanswers1');
} else {
$graph->y_order = array('stdev2', 'answers2', 'studanswers2');
}
$graph->parameter['y_max_left'] = $numoptions - 1;
$graph->parameter['y_axis_gridlines'] = $numoptions;
$graph->parameter['y_resolution_left'] = 1;
$graph->parameter['y_decimal_left'] = 1;
$graph->parameter['x_axis_angle'] = 20;
$graph->draw();
break;
case "studentmultiquestion.png":
$question = $DB->get_record("survey_questions", array("id" => $qid));
$question->text = get_string($question->text, "survey");
$question->options = get_string($question->options, "survey");
$options = explode(",", $question->options);
$questionorder = explode(",", $question->multi);
$qqq = $DB->get_records_list("survey_questions", "id", explode(',', $question->multi));
foreach ($questionorder as $i => $val) {
$names[$i] = get_string($qqq[$val]->shorttext, "survey");
$buckets1[$i] = 0;
$buckets2[$i] = 0;
$count1[$i] = 0;
$count2[$i] = 0;
$indexof[$val] = $i;
$studbuckets1[$i] = 0.0;
$studbuckets2[$i] = 0.0;
$studcount1[$i] = 0;
$studcount2[$i] = 0;
$stdev1[$i] = 0.0;
$stdev2[$i] = 0.0;
}
$aaa = $DB->get_records_select("survey_answers", "((survey = ?) AND (question in ($question->multi)))",
array($cm->instance));
if ($aaa) {
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
$index = $indexof[$a->question];
if ($a->userid == $sid) {
if ($a->answer1) {
$studbuckets1[$index] += $a->answer1;
$studcount1[$index]++;
}
if ($a->answer2) {
$studbuckets2[$index] += $a->answer2;
$studcount2[$index]++;
}
}
if ($a->answer1) {
$buckets1[$index] += $a->answer1;
$count1[$index]++;
}
if ($a->answer2) {
$buckets2[$index] += $a->answer2;
$count2[$index]++;
}
}
}
}
foreach ($questionorder as $i => $val) {
if ($count1[$i]) {
$buckets1[$i] = (float) $buckets1[$i] / (float) $count1[$i];
}
if ($count2[$i]) {
$buckets2[$i] = (float) $buckets2[$i] / (float) $count2[$i];
}
if ($studcount1[$i]) {
$studbuckets1[$i] = (float) $studbuckets1[$i] / (float) $studcount1[$i];
}
if ($studcount2[$i]) {
$studbuckets2[$i] = (float) $studbuckets2[$i] / (float) $studcount2[$i];
}
}
foreach ($aaa as $a) {
if (!$group or isset($users[$a->userid])) {
$index = $indexof[$a->question];
if ($a->answer1) {
$difference = (float) ($a->answer1 - $buckets1[$index]);
$stdev1[$index] += ($difference * $difference);
}
if ($a->answer2) {
$difference = (float) ($a->answer2 - $buckets2[$index]);
$stdev2[$index] += ($difference * $difference);
}
}
}
foreach ($questionorder as $i => $val) {
if ($count1[$i]) {
$stdev1[$i] = sqrt((float) $stdev1[$i] / ((float) $count1[$i]));
}
if ($count2[$i]) {
$stdev2[$i] = sqrt((float) $stdev2[$i] / ((float) $count2[$i]));
}
$buckets1[$i] = $buckets1[$i] - 1; // Hack because there should not be ANY 0 values in the data.
$buckets2[$i] = $buckets2[$i] - 1;
$studbuckets1[$i] = $studbuckets1[$i] - 1;
$studbuckets2[$i] = $studbuckets2[$i] - 1;
}
$maxbuckets1 = max($buckets1);
$maxbuckets2 = max($buckets2);
$graph = new graph($SURVEY_GWIDTH, $SURVEY_GHEIGHT);
$graph->parameter['title'] = "$question->text";
$graph->x_data = $names;
$graph->y_data['answers1'] = $buckets1;
$graph->y_format['answers1'] = array('colour' => 'ltblue', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 0.1, 'legend' => $stractualclass);
$graph->y_data['answers2'] = $buckets2;
$graph->y_format['answers2'] = array('colour' => 'ltorange', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 0.1, 'legend' => $strpreferredclass);
$graph->y_data['studanswers1'] = $studbuckets1;
$graph->y_format['studanswers1'] = array('colour' => 'blue', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $stractualstudent);
$graph->y_data['studanswers2'] = $studbuckets2;
$graph->y_format['studanswers2'] = array('colour' => 'orange', 'line' => 'line', 'point' => 'square',
'shadow_offset' => 4, 'legend' => $strpreferredstudent);
$graph->y_data['stdev1'] = $stdev1;
$graph->y_format['stdev1'] = array('colour' => 'ltltblue', 'bar' => 'fill',
'shadow_offset' => 0.1, 'legend' => 'none', 'bar_size' => 0.3);
$graph->y_data['stdev2'] = $stdev2;
$graph->y_format['stdev2'] = array('colour' => 'ltltorange', 'bar' => 'fill',
'shadow_offset' => 0.1, 'legend' => 'none', 'bar_size' => 0.2);
$graph->offset_relation['stdev1'] = 'answers1';
$graph->offset_relation['stdev2'] = 'answers2';
$graph->parameter['bar_size'] = 0.15;
$graph->parameter['legend'] = 'outside-top';
$graph->parameter['legend_border'] = 'black';
$graph->parameter['legend_offset'] = 4;
$graph->y_tick_labels = $options;
if (($maxbuckets1 > 0.0) && ($maxbuckets2 > 0.0)) {
$graph->y_order = array('stdev1', 'stdev2', 'answers1', 'answers2', 'studanswers1', 'studanswers2');
} else if ($maxbuckets1 > 0.0) {
$graph->y_order = array('stdev1', 'answers1', 'studanswers1');
} else {
$graph->y_order = array('stdev2', 'answers2', 'studanswers2');
}
$graph->parameter['y_max_left'] = count($options) - 1;
$graph->parameter['y_axis_gridlines'] = count($options);
$graph->parameter['y_resolution_left'] = 1;
$graph->parameter['y_decimal_left'] = 1;
$graph->parameter['x_axis_angle'] = 20;
$graph->draw();
break;
default:
break;
}
exit;