/**
* This method return a content html, it's used inside get_block method for showing it inside dashboard interface
* @return string content html
*/
public function get_teachers_information_graph()
{
$teachers = $this->teachers;
$graph = '';
$user_ids = array_keys($teachers);
$a_last_week = get_last_week();
if (is_array($user_ids) && count($user_ids) > 0) {
$dataSet = new pData();
foreach ($user_ids as $user_id) {
$teacher_info = api_get_user_info($user_id);
$username = $teacher_info['username'];
$time_by_days = array();
foreach ($a_last_week as $day) {
// day is received as y-m-d 12:00:00
$start_date = api_get_utc_datetime($day);
$end_date = api_get_utc_datetime($day + (3600 * 24 - 1));
$time_on_platform_by_day = Tracking::get_time_spent_on_the_platform($user_id, 'custom', $start_date, $end_date);
$hours = floor($time_on_platform_by_day / 3600);
$min = floor(($time_on_platform_by_day - $hours * 3600) / 60);
$time_by_days[] = $min;
}
$dataSet->addPoints($time_by_days, $username);
}
$last_week = date('Y-m-d', $a_last_week[0]) . ' ' . get_lang('To') . ' ' . date('Y-m-d', $a_last_week[6]);
$days_on_week = array();
foreach ($a_last_week as $weekday) {
$days_on_week[] = date('d/m', $weekday);
}
$dataSet->addPoints($days_on_week, 'Days');
$dataSet->setAbscissaName($last_week);
$dataSet->setAxisName(0, get_lang('Minutes'));
$dataSet->setAbscissa('Days');
$dataSet->loadPalette(api_get_path(SYS_CODE_PATH) . 'palettes/pchart/default.color', true);
// Cache definition
$cachePath = api_get_path(SYS_ARCHIVE_PATH);
$myCache = new pCache(array('CacheFolder' => substr($cachePath, 0, strlen($cachePath) - 1)));
$chartHash = $myCache->getHash($dataSet);
if ($myCache->isInCache($chartHash)) {
$imgPath = api_get_path(SYS_ARCHIVE_PATH) . $chartHash;
$myCache->saveFromCache($chartHash, $imgPath);
$imgPath = api_get_path(WEB_ARCHIVE_PATH) . $chartHash;
} else {
/* Create the pChart object */
$widthSize = 440;
$heightSize = 350;
$angle = 50;
$myPicture = new pImage($widthSize, $heightSize, $dataSet);
/* Turn of Antialiasing */
$myPicture->Antialias = false;
/* Add a border to the picture */
$myPicture->drawRectangle(0, 0, $widthSize - 1, $heightSize - 1, array('R' => 0, 'G' => 0, 'B' => 0));
/* Set the default font */
$myPicture->setFontProperties(array('FontName' => api_get_path(SYS_FONTS_PATH) . 'opensans/OpenSans-Regular.ttf', 'FontSize' => 10));
/* Do NOT Write the chart title */
/* Define the chart area */
$myPicture->setGraphArea(40, 40, $widthSize - 20, $heightSize - 80);
/* Draw the scale */
$scaleSettings = array('GridR' => 200, 'GridG' => 200, 'GridB' => 200, 'DrawSubTicks' => true, 'CycleBackground' => true, 'Mode' => SCALE_MODE_ADDALL_START0, 'LabelRotation' => $angle);
$myPicture->drawScale($scaleSettings);
/* Turn on shadow computing */
$myPicture->setShadow(true, array('X' => 1, 'Y' => 1, 'R' => 0, 'G' => 0, 'B' => 0, 'Alpha' => 10));
/* Draw the chart */
$myPicture->setShadow(true, array('X' => 1, 'Y' => 1, 'R' => 0, 'G' => 0, 'B' => 0, 'Alpha' => 10));
$settings = array('DisplayValues' => true, 'DisplayR' => 0, 'DisplayG' => 0, 'DisplayB' => 0);
$myPicture->drawFilledSplineChart($settings);
$myPicture->drawLegend(40, 20, array('Mode' => LEGEND_HORIZONTAL));
/* Write and save into cache */
$myCache->writeToCache($chartHash, $myPicture);
$imgPath = api_get_path(SYS_ARCHIVE_PATH) . $chartHash;
$myCache->saveFromCache($chartHash, $imgPath);
$imgPath = api_get_path(WEB_ARCHIVE_PATH) . $chartHash;
}
$graph = '<img src="' . $imgPath . '" >';
} else {
$graph = '<p>' . api_convert_encoding(get_lang('GraphicNotAvailable'), 'UTF-8') . '</p>';
}
return $graph;
}
