/**
* Display graphs as embedded images. Graphs are noon to noon unless parameters are provided. Results undefined if bounds are narrower than data.
* @param int $startHourPM earliest hour to show in graphs
* @param int $endHourPM end bound of graphs
*/
public function displaygraphs($startHourPM = 0, $endHourAM = 0)
{
foreach ($this->data as $night) {
$nightstart = strtotime($night['Start of Night']);
$nightend = strtotime($night['End of Night']);
//find noon of that day
$noon = self::previous_noon($nightstart);
//start at 9pm (adjust this if you have data earlier than this)
//The right way to do this would be to actually check the data upfront and set the offset automatically
$startoffset = 60 * 60 * $startHourPM;
$starttime = $noon + $startoffset;
//end data at noon
$endoffset = 60 * 60 * (12 - $endHourAM);
//find out how many intervals are needed to pad the data from noon
$intervalseconds = 30;
$pad_needed = round(($nightstart - $starttime) / $intervalseconds);
$pad = str_repeat('0 ', $pad_needed);
//put the padded data in an array for progressbar
$sleepdata = explode(' ', $pad . $night['Detailed Sleep Graph']);
//pad the array for the total number of hours
$sleepdata = array_pad($sleepdata, (60 * 60 * 24 - $startoffset - $endoffset) / $intervalseconds, 0);
//print((round($nightend-$nightstart)/30) . '-'. count($sleepdata).'<br>');
$progressbar = new ProgressBar($sleepdata, 1000, 50, ProgressBar::MODE_INTEGER, 'zeo');
print $night['Start of Night'] . ' ' . $progressbar->embedded_imagetag() . $night['End of Night'] . '<br>';
}
}