function removeOverlap($ol_start_date, $ol_start_time, $ol_key)
{
global $master_array, $overlap_array;
if (isset($overlap_array[$ol_start_date])) {
if (sizeof($overlap_array[$ol_start_date]) > 0) {
$ol_end_time = $master_array[$ol_start_date][$ol_start_time][$ol_key]['event_end'];
foreach ($overlap_array[$ol_start_date] as $block_key => $block) {
if (in_array(array('time' => $ol_start_time, 'key' => $ol_key), $block['events'])) {
// Check if this is a 2-event block (i.e., there's no block left when we remove $ol_key
// and if so, just unset it and move on.
if (count($block['events']) == 2) {
foreach ($block['events'] as $event) {
$master_array[$ol_start_date][$event['time']][$event['key']]['event_overlap'] = 0;
}
unset($overlap_array[$ol_start_date][$block_key]);
} else {
// remove $ol_key from 'events'
$event_key = array_search(array('time' => $ol_start_time, 'key' => $ol_key), $block['events']);
unset($overlap_array[$ol_start_date][$block_key]['events'][$event_key]);
// These may be bogus, since we're not using drawEventTimes.
// "clean up" 'overlapRanges' and calc the new maxOverlaps.
// use the special "-2" count to tell merge_range we're deleting.
$overlap_array[$ol_start_date][$block_key]['overlapRanges'] = merge_range($block['overlapRanges'], $ol_start_time, $ol_end_time, -2);
$overlap_array[$ol_start_date][$block_key]['maxOverlaps'] = find_max_overlap($block['overlapRanges']);
// recreate blockStart and blockEnd from the other events, and fix maxOverlap while we're at it.
$blockStart = $ol_end_time;
$blockEnd = $ol_start_time;
foreach ($overlap_array[$ol_start_date][$block_key]['events'] as $event) {
$blockStart = min($blockStart, $event['time']);
$blockEnd = max($blockEnd, $master_array[$ol_start_date][$event['time']][$event['key']]['event_end']);
$master_array[$ol_start_date][$event['time']][$event['key']]['event_overlap'] = $overlap_array[$ol_start_date][$block_key]['maxOverlaps'];
}
$overlap_array[$ol_start_date][$block_key]['blockStart'] = $blockStart;
$overlap_array[$ol_start_date][$block_key]['blockEnd'] = $blockEnd;
}
}
}
}
}
}
function checkOverlap($event_date, $event_time, $uid, &$master_array, &$overlap_array)
{
// global $master_array, $overlap_array;
if (!isset($event_date)) {
return;
}
$event = $master_array[$event_date][$event_time][$uid];
// Copy out the array - we replace this at the end.
$ol_day_array = $overlap_array[$event_date];
$drawTimes = drawEventTimes($event['event_start'], $event['event_end']);
// For a given date,
// - check to see if the event's already in a block, and if so, add it.
// - make sure the new block doesn't overlap another block, and if so, merge the blocks.
// - check that there aren't any events we already passed that we should handle.
// - "flatten" the structure again, merging the blocks.
// $overlap_array structure:
// array of ($event_dates)
// array of unique overlap blocks (no index) -
// $overlap_block structure
// 'blockStart' - $start_time of block - earliest $start_time of the events in the block.
// Shouldn't be any overlap w/ a different overlap block in that day (as if they overlap, they get merged).
// 'blockEnd' - $end_time of block - latest $end_time of the events in the block.
// 'maxOverlaps' - max number of overlaps for the whole block (highest 'count' in overlapRanges)
// 'events' - array of event "pointers" (no index) - each event in the block.
// 'time' - $start_time of event in the block
// 'key' - $uid of event
// 'overlapRanges' - array of time ranges + overlap counts (no index) - the specific overlap info.
// Shouldn't be any overlap w/ the overlap ranges in a given overlap_block - if there is overlap, the block should be split.
// 'count' - number of overlaps that time range (can be zero if that range has no overlaps).
// 'start' - start_time for the overlap block.
// 'end' - end_time for the overlap block.
$ol_day_array = $overlap_array[$event_date];
// Track if $event has been merged in, so we don't re-add the details to 'event' or 'overlapRanges' multiple times.
$already_merged_once = false;
// First, check the existing overlap blocks, see if the event overlaps with any.
if (isset($ol_day_array)) {
foreach ($ol_day_array as $loop_block_key => $loop_ol_block) {
// Should $event be in this $ol_block? If so, add it.
if ($loop_ol_block['blockStart'] < $drawTimes['draw_end'] && $loop_ol_block['blockEnd'] > $drawTimes['draw_start']) {
// ... unless it's already in the $ol_block
if (!in_array(array('time' => $drawTimes['draw_start'], 'key' => $uid), $loop_ol_block['events'])) {
$loop_ol_block['events'][] = array('time' => $drawTimes['draw_start'], 'key' => $uid);
if ($loop_ol_block['blockStart'] > $drawTimes['draw_start']) {
$loop_ol_block['blockStart'] = $drawTimes['draw_start'];
}
if ($loop_ol_block['blockEnd'] < $drawTimes['draw_end']) {
$loop_ol_block['blockEnd'] = $drawTimes['draw_end'];
}
// Merge in the new overlap range
$loop_ol_block['overlapRanges'] = merge_range($loop_ol_block['overlapRanges'], $drawTimes['draw_start'], $drawTimes['draw_end']);
$loop_ol_block['maxOverlaps'] = find_max_overlap($loop_ol_block['overlapRanges']);
foreach ($loop_ol_block['events'] as $max_overlap_event) {
$master_array[$event_date][$max_overlap_event['time']][$max_overlap_event['key']]['event_overlap'] = $loop_ol_block['maxOverlaps'];
}
$ol_day_array[$loop_block_key] = $loop_ol_block;
$ol_day_array = flatten_ol_blocks($event_date, $ol_day_array, $loop_block_key, $master_array);
$already_merged_once = true;
break;
// Handle repeat calls to checkOverlap - semi-bogus since the event shouldn't be created more than once, but this makes sure we don't get an invalid event_overlap.
} else {
$master_array[$event_date][$event_time][$uid]['event_overlap'] = $loop_ol_block['maxOverlaps'];
}
}
}
}
// Then, check all the events, make sure there isn't a new overlap that we need to create.
foreach ($master_array[$event_date] as $time_key => $time) {
// Skip all-day events for overlap purposes.
if ($time_key != '-1') {
foreach ($time as $loop_event_key => $loop_event) {
// Make sure we haven't already dealt with the event, and we're not checking against ourself.
if ($loop_event['event_overlap'] == 0 && $loop_event_key != $uid) {
$loopDrawTimes = drawEventTimes($loop_event['event_start'], $loop_event['event_end']);
if ($loopDrawTimes['draw_start'] < $drawTimes['draw_end'] && $loopDrawTimes['draw_end'] > $drawTimes['draw_start']) {
if ($loopDrawTimes['draw_start'] < $drawTimes['draw_start']) {
$block_start = $loopDrawTimes['draw_start'];
} else {
$block_start = $drawTimes['draw_start'];
}
if ($loopDrawTimes['draw_end'] > $drawTimes['draw_end']) {
$block_end = $loopDrawTimes['draw_end'];
} else {
$block_end = $drawTimes['draw_end'];
}
$events = array(array('time' => $loopDrawTimes['draw_start'], 'key' => $loop_event_key));
$overlap_ranges = array(array('count' => 0, 'start' => $loopDrawTimes['draw_start'], 'end' => $loopDrawTimes['draw_end']));
// Only add $event if we haven't already put it in a block
if (!$already_merged_once) {
$events[] = array('time' => $drawTimes['draw_start'], 'key' => $uid);
$overlap_ranges = merge_range($overlap_ranges, $drawTimes['draw_start'], $drawTimes['draw_end']);
$already_merged_once = true;
}
$ol_day_array[] = array('blockStart' => $block_start, 'blockEnd' => $block_end, 'maxOverlaps' => 1, 'events' => $events, 'overlapRanges' => $overlap_ranges);
foreach ($events as $max_overlap_event) {
$master_array[$event_date][$max_overlap_event['time']][$max_overlap_event['key']]['event_overlap'] = 1;
}
// Make sure we pass in the key of the newly added item above.
end($ol_day_array);
$last_day_key = key($ol_day_array);
$ol_day_array = flatten_ol_blocks($event_date, $ol_day_array, $last_day_key, $master_array);
}
}
}
}
}
$overlap_array[$event_date] = $ol_day_array;
//for debugging the checkOverlap function
//if ($event_date == '20050506') {
//print 'Date: ' . $event_date . ' / Time: ' . $event_time . ' / Key: ' . $uid . "<br />\n";
//print '<pre>';
//print_r($master_array[$event_date]);
//print_r($overlap_array[$event_date]);
//print '</pre>';
//}
}
