diff options
author | Jim Hu <jimhu@users.sourceforge.net> | 2008-12-11 23:48:39 +0000 |
---|---|---|
committer | Jim Hu <jimhu@users.sourceforge.net> | 2008-12-11 23:48:39 +0000 |
commit | b1aaa3b6ca8894ac0422fb3aeadded29c2b83972 (patch) | |
tree | 7689417eb311569ffe966c5f60aeb7a8e9ff2035 /functions/parse/overlapping_events.php | |
parent | b8fa9f6a3a0d0bad52babec3573899ba37873477 (diff) | |
download | phpicalendar-b1aaa3b6ca8894ac0422fb3aeadded29c2b83972.tar.gz phpicalendar-b1aaa3b6ca8894ac0422fb3aeadded29c2b83972.tar.bz2 phpicalendar-b1aaa3b6ca8894ac0422fb3aeadded29c2b83972.zip |
add new files
Diffstat (limited to 'functions/parse/overlapping_events.php')
-rw-r--r-- | functions/parse/overlapping_events.php | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/functions/parse/overlapping_events.php b/functions/parse/overlapping_events.php new file mode 100644 index 0000000..9595c83 --- /dev/null +++ b/functions/parse/overlapping_events.php @@ -0,0 +1,274 @@ +<?php +// function to determine maximum necessary columns per day +// actually an algorithm to get the smallest multiple for two numbers +function kgv($a, $b) { + $x = $a; + $y = $b; + while ($x != $y) { + if ($x < $y) $x += $a; + else $y += $b; + } + return $x; +} + +// merge a given range into $ol_ranges. Returns the merged $ol_ranges. +// if count = -2, treat as a "delete" call (for removeOverlap) +// Why -2? That way, there's less fudging of the math in the code. +function merge_range($ol_ranges, $start, $end, $count = 0) { + + foreach ($ol_ranges as $loop_range_key => $loop_range) { + + if ($start < $end) { + // handle ranges between $start and $loop_range['start'] + if ($start < $loop_range['start']) { + $new_ol_ranges[] = array('count' => $count, 'start' => $start, 'end' => min($loop_range['start'], $end)); + $start = $loop_range['start']; + } + + // $start is always >= $loop_range['start'] at this point. + // handles ranges between $loop_range['start'] and $loop_range['end'] + if ($loop_range['start'] < $end && $start < $loop_range['end']) { + // handles ranges between $loop_range['start'] and $start + if ($loop_range['start'] < $start) { + $new_ol_ranges[] = array('count' => $loop_range['count'], 'start' => $loop_range['start'], 'end' => $start); + } + // handles ranges between $start and $end (where they're between $loop_range['start'] and $loop_range['end']) + $new_count = $loop_range['count'] + $count + 1; + if ($new_count >= 0) { + $new_ol_ranges[] = array('count' => $new_count, 'start' => $start, 'end' => min($loop_range['end'], $end)); + } + // handles ranges between $end and $loop_range['end'] + if ($loop_range['end'] > $end) { + $new_ol_ranges[] = array('count' => $loop_range['count'], 'start' => $end, 'end' => $loop_range['end']); + } + $start = $loop_range['end']; + } else { + $new_ol_ranges[] = $loop_range; + } + } else { + $new_ol_ranges[] = $loop_range; + } + } + + // Catches anything left over. + if ($start < $end) { + $new_ol_ranges[] = array('count' => $count, 'start' => $start, 'end' => $end); + } + + return $new_ol_ranges; +} + +// Finds the highest value of 'count' in $ol_ranges +function find_max_overlap($ol_ranges) { + + $count = 0; + foreach ($ol_ranges as $loop_range) { + if ($count < $loop_range['count']) + $count = $loop_range['count']; + } + + return $count; +} + +// Merges overlapping blocks +function flatten_ol_blocks($event_date, $ol_blocks, $new_block_key) { + + global $master_array; + + // Loop block = each other block in the array, the ones we're merging into new block. + // New block = the changed block that caused the flatten_ol_blocks call. Everything gets merged into this. + $new_block = $ol_blocks[$new_block_key]; + reset($ol_blocks); + while ($loop_block_array = each($ol_blocks)) { + $loop_block_key = $loop_block_array['key']; + $loop_block = $loop_block_array['value']; + // only compare with other blocks + if ($loop_block_key != $new_block_key) { + // check if blocks overlap + if (($loop_block['blockStart'] < $new_block['blockEnd']) && ($loop_block['blockEnd'] > $new_block['blockStart'])) { + // define start and end of merged overlap block + if ($new_block['blockStart'] > $loop_block['blockStart']) $ol_blocks[$new_block_key]['blockStart'] = $loop_block['blockStart']; + if ($new_block['blockEnd'] < $loop_block['blockEnd']) $ol_blocks[$new_block_key]['blockEnd'] = $loop_block['blockEnd']; + $ol_blocks[$new_block_key]['events'] = array_merge($new_block['events'], $loop_block['events']); + $new_block['events'] = $ol_blocks[$new_block_key]['events']; + foreach ($loop_block['overlapRanges'] as $ol_range) { + $new_block['overlapRanges'] = merge_range($new_block['overlapRanges'], $ol_range['start'], $ol_range['end'], $ol_range['count']); + } + $ol_blocks[$new_block_key]['overlapRanges'] = $new_block['overlapRanges']; + $ol_blocks[$new_block_key]['maxOverlaps'] = find_max_overlap($new_block['overlapRanges']); + foreach ($ol_blocks[$new_block_key]['events'] as $event) { + $master_array[$event_date][$event['time']][$event['key']]['event_overlap'] = $ol_blocks[$new_block_key]['maxOverlaps']; + } + unset($ol_blocks[$loop_block_key]); + reset($ol_blocks); + } + } + } + + return $ol_blocks; +} + +// Builds $overlap_array structure, and updates event_overlap in $master_array for the given events. +function checkOverlap($event_date, $event_time, $uid) { + 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); + $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); + } + } + } + } + } + + $overlap_array[$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[$event_date]); +//print '</pre>'; +//} + +} + +// Remove an event from the overlap data. +// This could be completely bogus, since overlap array is empty when this gets called in my tests, but I'm leaving it in anyways. +function removeOverlap($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; + } + } + } + } + } +} +?> |