private void RollDownTimeZones()
{
if (TimeZones.Count > 0 && ChildNodes.Count > 0)
{
foreach (var hashChar in GeohashTree.Base32)
{
if (!ChildNodes.TryGetValue(hashChar, out var childNode))
{
childNode = ChildNodes[hashChar] = new TimeZoneTreeNode();
}
foreach (var timeZone in TimeZones)
{
childNode.TimeZones.Add(timeZone);
}
}
TimeZones.Clear();
}
foreach (var childNode in ChildNodes)
{
childNode.Value.RollDownTimeZones();
}
}
private void RollDownTimeZones()
{
if (TimeZones.Count > 0 && ChildNodes.Count > 0)
{
foreach (var hashChar in GeohashTree.Base32)
{
TimeZoneTreeNode childNode;
if (!ChildNodes.TryGetValue(hashChar, out childNode))
{
childNode = ChildNodes[hashChar] = new TimeZoneTreeNode();
}
foreach (var timeZone in TimeZones)
{
childNode.TimeZones.Add(timeZone);
}
}
TimeZones.Clear();
}
foreach (var childNode in ChildNodes)
{
childNode.Value.RollDownTimeZones();
}
}
private static void WriteTreeNode(StreamWriter writer, TimeZoneTreeNode node, string geohash = "")
{
foreach (var childNode in node.ChildNodes.OrderBy(x => x.Key))
{
var childHash = geohash + childNode.Key;
if (childNode.Value.TimeZones.Count > 0)
{
var groupedTimeZones = childNode.Value.TimeZones.GroupBy(x => x.TzName).ToList();
if (groupedTimeZones.Count > 1)
{
var env = GeohashTree.GetTreeNode(childHash).Geometry;
var tzs = groupedTimeZones.Select(x => new
{
TimeZone = x.Key,
Area = x.Sum(c =>
{
var intersection = c.Geometry.Intersection(env);
return(intersection.Area / env.Area);
})
})
.OrderByDescending(x => x.Area);
foreach (var timeZone in tzs)
{
WriteGeohash(writer, timeZone.TimeZone, childHash);
}
}
else
{
foreach (var timeZone in groupedTimeZones)
{
WriteGeohash(writer, timeZone.Key, childHash);
}
}
}
else if (childNode.Value.ChildNodes.Count > 0)
{
WriteTreeNode(writer, childNode.Value, childHash);
}
}
}
private static void WriteTreeNode(StreamWriter writer, TimeZoneTreeNode node, string geohash = "")
{
foreach (var childNode in node.ChildNodes.OrderBy(x => x.Key))
{
var childHash = geohash + childNode.Key;
if (childNode.Value.TimeZones.Count > 0)
{
var groupedTimeZones = childNode.Value.TimeZones.GroupBy(x => x.TzName).ToList();
if (groupedTimeZones.Count > 1)
{
var env = GeohashTree.GetTreeNode(childHash).Geometry;
var tzs = groupedTimeZones.Select(x => new
{
TimeZone = x.Key,
Area = x.Sum(c =>
{
var intersection = c.Geometry.Intersection(env);
return intersection.Area / env.Area;
})
})
.OrderByDescending(x => x.Area);
foreach (var timeZone in tzs)
{
WriteGeohash(writer, timeZone.TimeZone, childHash);
}
}
else
{
foreach (var timeZone in groupedTimeZones)
{
WriteGeohash(writer, timeZone.Key, childHash);
}
}
}
else if (childNode.Value.ChildNodes.Count > 0)
{
WriteTreeNode(writer, childNode.Value, childHash);
}
}
}
