/**
* Generates a big graph with the number of best results
* @param array
*/
static function generate_exercise_result_graph($attempts)
{
$exercise_title = strip_tags($attempts['title']);
$attempts = $attempts['data'];
$my_exercise_result_array = $exercise_result = array();
if (empty($attempts)) {
return null;
}
foreach ($attempts as $attempt) {
if (api_get_user_id() == $attempt['exe_user_id']) {
if ($attempt['exe_weighting'] != 0) {
$my_exercise_result_array[] = $attempt['exe_result'] / $attempt['exe_weighting'];
}
} else {
if ($attempt['exe_weighting'] != 0) {
$exercise_result[] = $attempt['exe_result'] / $attempt['exe_weighting'];
}
}
}
//Getting best result
rsort($my_exercise_result_array);
$my_exercise_result = 0;
if (isset($my_exercise_result_array[0])) {
$my_exercise_result = $my_exercise_result_array[0] * 100;
}
$max = 100;
$pieces = 5;
$part = round($max / $pieces);
$x_axis = array();
$final_array = array();
$my_final_array = array();
for ($i = 1; $i <= $pieces; $i++) {
$sum = 1;
if ($i == 1) {
$sum = 0;
}
$min = ($i - 1) * $part + $sum;
$max = $i * $part;
$x_axis[] = $min . " - " . $max;
$count = 0;
foreach ($exercise_result as $result) {
$percentage = $result * 100;
if ($percentage >= $min && $percentage <= $max) {
$count++;
}
}
$final_array[] = $count;
if ($my_exercise_result >= $min && $my_exercise_result <= $max) {
$my_final_array[] = 1;
} else {
$my_final_array[] = 0;
}
}
//Fix to remove the data of the user with my data
for ($i = 0; $i <= count($my_final_array); $i++) {
if (!empty($my_final_array[$i])) {
$my_final_array[$i] = $final_array[$i] + 1;
//Add my result
$final_array[$i] = 0;
}
}
// Dataset definition
$dataSet = new pData();
$dataSet->addPoints($final_array, 'Serie1');
$dataSet->addPoints($my_final_array, 'Serie2');
$dataSet->addPoints($x_axis, 'Serie3');
$dataSet->setSerieDescription('Serie1', get_lang('Score'));
$dataSet->setSerieDescription('Serie2', get_lang('MyResults'));
$dataSet->setAbscissa('Serie3');
$dataSet->setXAxisName(get_lang('Score'));
$dataSet->normalize(100, "%");
$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 = 480;
$heightSize = 250;
$fontSize = 8;
$myPicture = new pImage($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));
/* Write the chart title */
$myPicture->drawText(250, 20, $exercise_title, array('FontSize' => 12, 'Align' => TEXT_ALIGN_BOTTOMMIDDLE));
/* Define the chart area */
$myPicture->setGraphArea(50, 50, $widthSize - 20, $heightSize - 30);
/* Draw the scale */
$scaleSettings = array('GridR' => 200, 'GridG' => 200, 'GridB' => 200, 'DrawSubTicks' => true, 'CycleBackground' => true, 'Mode' => SCALE_MODE_MANUAL, 'ManualScale' => array('0' => array('Min' => 0, 'Max' => 100)));
$myPicture->drawScale($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, 'DisplaySize' => $fontSize, 'DisplayR' => 0, 'DisplayG' => 0, 'DisplayB' => 0, 'DisplayOrientation' => ORIENTATION_HORIZONTAL, 'Gradient' => false, 'Surrounding' => 30, 'InnerSurrounding' => 25);
$myPicture->drawStackedBarChart($settings);
$legendSettings = array('Mode' => LEGEND_HORIZONTAL, 'Style' => LEGEND_NOBORDER);
$myPicture->drawLegend($widthSize / 2, 30, $legendSettings);
/* 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;
}
return $imgPath;
}
