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<?php

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)) {
        print_error('invalidcoursemodule');
    }

if (! $course = $DB->get_record("course", array("id"=>$cm->course))) {
        print_error('coursemisconf');
    }

if ($sid) {
        if (!$user = $DB->get_record("user", array("id"=>$sid))) {
            print_error('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 != $USER->id ) {
            print_error('nopermissiontoshow');
        } else if ($groupmode and !groups_is_member($group)) {
            print_error('nopermissiontoshow');
        }
    }

if (! $survey = $DB->get_record("survey", array("id"=>$cm->instance))) {
        print_error('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));
       $question->text = get_string($question->text, "survey");
       $question->options = get_string($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]++;
                   }
               }
           }
       }

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);
                   }
               }
           }
       }

$maxbuckets1 = max($buckets1);
       $maxbuckets2 = max($buckets2);

$graph = new graph($SURVEY_GWIDTH,$SURVEY_GHEIGHT);
       $graph->parameter['title'] = "$question->text";

$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;

$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));

$options = explode(",",$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);
                   }
               }
           }

$buckets1[$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->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;