user_id = $user_id;
if (api_is_platform_admin()) {
$this->students = UserManager::get_user_list(array('status' => STUDENT));
} else if (api_is_drh()) {
$this->students = UserManager::get_users_followed_by_drh($user_id, STUDENT);
}
$this->path = 'block_student_graph';
}
/**
* This method return content html containing information about students and its position for showing it inside dashboard interface
* it's important to use the name 'get_block' for beeing used from dashboard controller
* @return array column and content html
*/
public function get_block() {
global $charset;
$column = 1;
$data = array();
/*
if (api_is_platform_admin()) {
$student_content_html = $this->get_students_content_html_for_platform_admin();
} else if (api_is_drh()) {*/
$students_evaluation_graph = $this->get_students_evaluation_graph();
//}
$html = '
'.$students_evaluation_graph.'
';
$data['column'] = $column;
$data['content_html'] = $html;
return $data;
}
/**
* This method return a graph containing informations about students evaluation, it's used inside get_block method for showing it inside dashboard interface
* @return string img html
*/
public function get_students_evaluation_graph() {
$students = $this->students;
$attendance = new Attendance();
// get data
$attendances_faults_avg = array();
foreach ($students as $student) {
$student_id = $student['user_id'];
$student_info = api_get_user_info($student_id);
// get average of faults in attendances by student
$results_faults_avg = $attendance->get_faults_average_inside_courses($student_id);
if (!empty($results_faults_avg)) {
$attendances_faults_avg[$student_info['username']] = $results_faults_avg['porcent'];
} else {
$attendances_faults_avg[$student_info['username']] = 0;
}
}
arsort($attendances_faults_avg);
$usernames = array_keys($attendances_faults_avg);
// get only until five users
if (count($usernames) > 5) { array_splice($usernames,5); }
$faults = array();
foreach ($usernames as $username) {
$faults[] = $attendances_faults_avg[$username];
}
$graph = '';
$img_file = '';
if (is_array($usernames) && count($usernames) > 0) {
// Defining data
$data_set = new pData;
$data_set->AddPoint($usernames,"Usuario");
$data_set->AddPoint($faults,"Promedio");
$data_set->AddAllSeries();
$data_set->SetXAxisName(get_lang('UserName'));
$data_set->SetYAxisName(get_lang('AttendancesFaults'));
$data_set->SetAbsciseLabelSerie("Usuario");
$graph_id = $this->user_id.'StudentEvaluationGraph';
$cache = new pCache();
// the graph id
$data = $data_set->GetData();
if ($cache->IsInCache($graph_id, $data_set->GetData())) {
//if we already created the img
$img_file = $cache->GetHash($graph_id, $data_set->GetData());
} else {
// Initializing the graph
$test = new pChart(365,250);
$test->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',8);
$test->setGraphArea(50,30,345,200);
$test->drawFilledRoundedRectangle(7,7,371,240,5,240,240,240);
$test->drawRoundedRectangle(5,5,373,225,5,230,230,230);
$test->drawGraphArea(255,255,255,TRUE);
$test->setFixedScale(0,100,5);
$test->drawScale($data_set->GetData(),$data_set->GetDataDescription(),SCALE_NORMAL,150,150,150,TRUE,0,10,TRUE);
$test->drawGrid(4,TRUE,230,230,230,50);
// Drawing bars
$test->drawBarGraph($data_set->GetData(),$data_set->GetDataDescription(),TRUE);
// Drawing title
$test->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',10);
$test->drawTitle(50,22,get_lang('AttendancesFaults'),50,50,50,385);
$test->writeValues($data_set->GetData(),$data_set->GetDataDescription(),"Promedio");
$cache->WriteToCache($graph_id, $data_set->GetData(), $test);
ob_start();
$test->Stroke();
ob_end_clean();
$img_file = $cache->GetHash($graph_id, $data_set->GetData());
}
if (!empty($img_file)) {
$graph = '.$img_file.')
';
}
} else {
$graph = ''.api_convert_encoding(get_lang('GraphicNotAvailable'),'UTF-8').'
';
}
return $graph;
}
/**
* Get number of students
* @return int
*/
function get_number_of_students() {
return count($this->students);
}
}
?>