<?php
// function returns starttime and endtime and event length for drawing into a grid

function drawEventTimes ($start, $end) {
	global $gridLength;
	
	ereg ("([0-9]{2})([0-9]{2})", $start, $time);
	$sta_h = $time[1];
	$sta_min = $time[2];
	$sta_min = sprintf("%02d", floor($sta_min / $gridLength) * $gridLength);
	if ($sta_min == 60) {
		$sta_h = sprintf("%02d", ($sta_h + 1));
		$sta_min = "00";
	}
	
	ereg ("([0-9]{2})([0-9]{2})", $end, $time);
	$end_h = $time[1];
	$end_min = $time[2];
	$end_min = sprintf("%02d", floor($end_min / $gridLength) * $gridLength);
	if ($end_min == 60) {
		$end_h = sprintf("%02d", ($end_h + 1));
		$end_min = "00";
	}
	
	if (($sta_h . $sta_min) == ($end_h . $end_min))  {
		$end_min += $gridLength;
		if ($end_min == 60) {
			$end_h = sprintf("%02d", ($end_h + 1));
			$end_min = "00";
		}
	}
	
	$draw_len = ($end_h * 60 + $end_min) - ($sta_h * 60 + $sta_min);
	
	return array ("draw_start" => ($sta_h . $sta_min), "draw_end" => ($end_h . $end_min), "draw_length" => $draw_len);
}
?>