getZoomlevelRangeWay method

ZoomlevelRange? getZoomlevelRangeWay(Waypath waypath, ITagCollection tags)

Returns the widest possible zoomrange which may accept the given argument. Returns null if if the argument will never accepted.

Implementation

ZoomlevelRange? getZoomlevelRangeWay(Waypath waypath, ITagCollection tags) {
  bool isClosedWay = waypath.isClosedWay();
  ZoomlevelRange? result = isClosedWay ? closedWayMatchingCache[tags] : openWayMatchingCache[tags];
  if (result != null) {
    if (result == const ZoomlevelRange.none()) return null;
    return result;
  }
  //    ZoomlevelRange? result;
  for (var rule in rulesList) {
    ZoomlevelRange? range = isClosedWay ? rule.getZoomlevelRangeClosedWay(tags) : rule.getZoomlevelRangeOpenWay(tags);
    if (range != null) {
      result = result?.widenTo(range) ?? range;
    }
  }
  if (isClosedWay) {
    closedWayMatchingCache[tags] = result ?? const ZoomlevelRange.none();
  } else {
    openWayMatchingCache[tags] = result ?? const ZoomlevelRange.none();
  }
  return result;
}