drei - overlapping event fucntions from ical_parser.php

1 files changed, 153 insertions, 0 deletions

diff --git a/functions/overlapping_events.php b/functions/overlapping_events.php
new file mode 100644
index 0000000..be40031
--- /dev/null
+++ b/functions/overlapping_events.php
@@ -0,0 +1,153 @@
+<?
+// function to determine the colspan for overlapping events
+// takes 2 parameters: index of event (in regards of column output) and number of overlapping events
+function eventWidth($ind, $overlaps) {
+	switch ($overlaps) {
+	// case 1 means 1 overlap -> two concurrent events etc.
+		case 0:
+			return 12;
+			break;
+		case 1:
+			return 6;
+			break;
+		case 2:
+			return 4;
+			break;
+		case 3:
+			return 3;
+			break;
+		case 4:
+			switch ($ind) {
+				case 0:
+					return 3;
+					break;
+				case 2:
+					return 3;
+					break;
+				default:
+					return 2;
+			}
+			break;
+		case 5:
+			return 2;
+			break;
+		case 6:
+			switch ($ind) {
+				case 0:
+					return 1;
+					break;
+				case 3:
+					return 1;
+					break;
+				default:
+					return 2;
+			}
+			break;
+		case 7:
+			switch ($ind) {
+				case 0:
+					return 2;
+					break;
+				case 2:
+					return 2;
+					break;
+				case 4:
+					return 2;
+					break;
+				case 6:
+					return 2;
+					break;
+				default:
+					return 1;
+			}
+			break;
+		case 8:
+			switch ($ind) {
+				case 0:
+					return 2;
+					break;
+				case 3:
+					return 2;
+					break;
+				case 6:
+					return 2;
+					break;
+				default:
+					return 1;
+			}
+			break;
+		case 9:
+			switch ($ind) {
+				case 0:
+					return 2;
+					break;
+				case 7:
+					return 2;
+					break;
+				default:
+					return 1;
+			}
+			break;
+		case 10:
+			switch ($ind) {
+				case 5:
+					return 2;
+					break;
+				default:
+					return 1;
+			}
+			break;
+		case 11:
+			return 1;
+			break;
+	}
+} 
+
+// drei 20020921: function for checking and counting overlapping events
+function checkOverlap() {
+	global $master_array, $overlap_array, $start_date, $start_time, $end_time;
+
+		$maxOverlaps = 0;
+		if (sizeof($master_array[($start_date)]) > 0) {
+			foreach ($master_array[($start_date)] as $keyTime => $eventTime) {
+				foreach ($eventTime as $keyEvent => $event) {
+					if (($event["event_start"] < $end_time) and ($event["event_end"] > $start_time)) {
+
+						if ($event["event_start"] < $start_time) $overlap_start = $start_time;
+						else $overlap_start = $event["event_start"];
+						if ($event["event_end"] < $end_time) $overlap_end = $event["event_end"];
+						else $overlap_end = $end_time;
+						
+						if (sizeof($overlap_array[($start_date)][($keyTime)][($keyEvent)]) > 0) {
+							$newOverlapEntry = TRUE;
+							foreach ($overlap_array[($start_date)][($keyTime)][($keyEvent)] as $keyOverlap => $overlapEntry) {
+								if (($overlapEntry["start"] < $overlap_end) and ($overlapEntry["end"] > $overlap_start)) {
+									$overlap_array[($start_date)][($keyTime)][($keyEvent)][($keyOverlap)]["count"]++;
+									if ($overlapEntry["start"] < $overlap_start) {
+										$overlap_array[($start_date)][($keyTime)][($keyEvent)][($keyOverlap)]["start"] = $overlap_start;
+									}
+									if ($overlapEntry["end"] > $overlap_end) {
+										$overlap_array[($start_date)][($keyTime)][($keyEvent)][($keyOverlap)]["end"] = $overlap_end;
+									}
+									$newOverlapEntry = FALSE;
+									break;
+								}
+							}
+							if ($newOverlapEntry) {
+								array_push($overlap_array[($start_date)][($keyTime)][($keyEvent)], array ("count" => 1,"start" => $overlap_start, "end" => $overlap_end));
+							}
+						} else {
+							$overlap_array[($start_date)][($keyTime)][($keyEvent)][] = array ("count" => 1,"start" => $overlap_start, "end" => $overlap_end);
+						}
+						foreach ($overlap_array[($start_date)][($keyTime)][($keyEvent)] as $keyOverlap => $overlapEntry) {
+							if ($overlapEntry["count"] > $maxOverlaps) $maxOverlaps = $overlapEntry["count"];
+						}
+						$master_array[($start_date)][($keyTime)][($keyEvent)]["event_overlap"] = $maxOverlaps;
+					}
+				}
+			}
+		}	
+
+	return $maxOverlaps;
+}
+?>
\ No newline at end of file