private function renderTimeLineChart($data, $title, $filename)
{
$chart = new Libchart\View\Chart\LineChart(750, 450);
$dataSet = new Libchart\Model\XYDataSet();
foreach ($data as $key => $value) {
$dataSet->addPoint(new Libchart\Model\Point($key, $value));
}
$chart->setDataSet($dataSet);
$chart->setTitle($title);
$chart->render(CACHE_PATH . $filename);
$this->view->assign('cache_path', BASE_URI . 'cache/');
}
$createdAt = new \DateTime($tweet['created_at']);
if (!isset($hours[$createdAt->format('H')])) {
$hours[$createdAt->format('H')] = 0;
}
$hours[$createdAt->format('H')]++;
}
ksort($hours);
// create a histogram
$outputFolder = 'generated';
$outputDirectory = __DIR__ . DIRECTORY_SEPARATOR . $outputFolder;
$outputFile = 'sample.png';
if (!file_exists($outputDirectory)) {
mkdir($outputDirectory, 0777, true);
}
$chart = new \Libchart\View\Chart\VerticalBarChart();
$dataSet = new \Libchart\Model\XYDataSet();
foreach ($hours as $hour => $count) {
$time = date('ga', strtotime("{$hour}:00"));
$dataSet->addPoint(new \Libchart\Model\Point($time, $count));
}
$chart->setDataSet($dataSet);
$chart->setTitle("Active hours user tweeted");
$chart->render($outputDirectory . DIRECTORY_SEPARATOR . $outputFile);
// show histogram
echo '<img alt="Vertical bars chart" src="' . $outputFolder . '/' . $outputFile . '" style="border: 1px solid gray;"/>';
/**
* Obviously, this needs to be in MVC using some framework.
*/
} catch (\Exception $e) {
throw $e;
}