290 lines
11 KiB
C#
290 lines
11 KiB
C#
using Logging;
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using System.Xml;
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using Graph;
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namespace OpenStreetMap_Importer
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{
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public class Importer
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{
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public static Dictionary<ulong, Node> Import(string filePath = "", Logger ?logger = null)
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{
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List<Way> ways = new();
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Dictionary<ulong, Node> nodes = new();
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Stream mapData;
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XmlReaderSettings readerSettings = new()
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{
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IgnoreWhitespace = true,
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IgnoreComments = true
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};
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bool wayTag = false;
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Way currentWay = new();
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Dictionary<ulong, ushort> count = new();
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/*
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* First iteration
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* Import "ways" with a tag "highway"
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* Count occurances of "nodes" to find junctions
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*/
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if (!File.Exists(filePath))
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{
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mapData = new MemoryStream(OSM_Data.map);
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logger?.Log(LogLevel.INFO, "Filepath '{0}' does not exist. Using standard file.", filePath);
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}
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else
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{
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mapData = new FileStream(filePath, FileMode.Open, FileAccess.Read);
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logger?.Log(LogLevel.INFO, "Using file '{0}'", filePath);
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}
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XmlReader reader = XmlReader.Create(mapData, readerSettings);
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reader.MoveToContent();
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logger?.Log(LogLevel.INFO, "Importing ways and counting nodes...");
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while (reader.Read())
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{
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if (reader.Name == "way" && reader.IsStartElement())
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{
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logger?.Log(LogLevel.VERBOSE, "WAY {0} nodes {1}", currentWay.highway.ToString(), currentWay.nodeIds.Count);
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if (currentWay.highway != Way.highwayType.NONE)
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{
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ways.Add(currentWay);
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foreach (ulong id in currentWay.nodeIds)
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if(count.ContainsKey(id))
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count[id]++;
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else
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count.TryAdd(id, 1);
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}
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wayTag = true;
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currentWay = new Way();
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}
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else if (reader.Name == "tag" && wayTag)
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{
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#pragma warning disable CS8600 //tags will always have a value and key
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#pragma warning disable CS8604
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string value = reader.GetAttribute("v");
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string key = reader.GetAttribute("k");
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logger?.Log(LogLevel.VERBOSE, "TAG {0} {1}", key, value);
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#pragma warning restore CS8600
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switch (key)
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{
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case "highway":
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currentWay.SetHighwayType(value);
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break;
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case "oneway":
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switch (value)
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{
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case "yes":
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currentWay.oneway = true;
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break;
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/*case "no":
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currentWay.oneway = false;
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break;*/
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case "-1":
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currentWay.oneway = true;
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currentWay.direction = Way.wayDirection.backward;
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break;
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}
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break;
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/*case "name":
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break;*/
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}
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#pragma warning restore CS8604
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}
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else if(reader.Name == "nd" && wayTag)
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{
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ulong id = Convert.ToUInt64(reader.GetAttribute("ref"));
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currentWay.nodeIds.Add(id);
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logger?.Log(LogLevel.VERBOSE, "nd: {0}", id);
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}
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else if(reader.Name == "node")
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{
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wayTag = false;
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}
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}
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logger?.Log(LogLevel.DEBUG, "Loaded Ways: {0} Required Nodes: {1}", ways.Count, count.Count);
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reader.Close();
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GC.Collect();
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if (!File.Exists(filePath))
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{
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mapData = new MemoryStream(OSM_Data.map);
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logger?.Log(LogLevel.INFO, "Filepath '{0}' does not exist. Using standard file.", filePath);
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}
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else
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{
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mapData = new FileStream(filePath, FileMode.Open, FileAccess.Read);
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logger?.Log(LogLevel.INFO, "Using file '{0}'", filePath);
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}
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reader = XmlReader.Create(mapData, readerSettings);
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reader.MoveToContent();
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/*
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* Second iteration
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* Import nodes that are needed by the "ways"
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*/
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logger?.Log(LogLevel.INFO, "Importing nodes...");
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while (reader.Read())
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{
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if (reader.Name == "node")
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{
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ulong id = Convert.ToUInt64(reader.GetAttribute("id"));
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if (count.ContainsKey(id))
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{
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#pragma warning disable CS8602 //node will always have a lat and lon
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float lat = Convert.ToSingle(reader.GetAttribute("lat").Replace('.', ','));
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float lon = Convert.ToSingle(reader.GetAttribute("lon").Replace('.', ','));
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#pragma warning restore CS8602
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nodes.TryAdd(id, new Node(lat, lon));
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logger?.Log(LogLevel.VERBOSE, "NODE {0} {1} {2} {3}", id, lat, lon, count[id]);
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}
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}
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}
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/*
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* Add connections between nodes (only junctions, e.g. nodes are referenced more than once)
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* Remove non-junction nodes
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*/
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logger?.Log(LogLevel.INFO, "Calculating Edges and distances...");
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ulong edges = 0;
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foreach(Way way in ways)
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{
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Node junction1 = nodes[way.nodeIds[0]];
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Node junction2;
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double weight = 0;
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//Iterate Node-ids in current way forwards or backwards (depending on way.direction)
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if (way.direction == Way.wayDirection.forward)
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{
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for (int index = 0; index < way.nodeIds.Count - 1; index++)
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{
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Node currentNode = nodes[way.nodeIds[index]];
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Node nextNode = nodes[way.nodeIds[index + 1]];
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weight += Utils.DistanceBetweenNodes(currentNode, nextNode);
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if (count[way.nodeIds[index + 1]] > 1 || index == way.nodeIds.Count - 2)
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{
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/*
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* If Node is referenced more than once => Junction
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* If Node is last node of way => Junction
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* Add an edge between two junctions
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*/
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junction2 = nodes[way.nodeIds[index + 1]];
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junction1.edges.Add(new Edge(junction2, weight));
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logger?.Log(LogLevel.VERBOSE, "EDGE {0} -- {1} --> {2}", way.nodeIds[index], weight, way.nodeIds[index + 1]);
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edges++;
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if (!way.oneway)
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{
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junction2.edges.Add(new Edge(junction1, weight));
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logger?.Log(LogLevel.VERBOSE, "EDGE {0} -- {1} --> {2}", way.nodeIds[index + 1], weight, way.nodeIds[index]);
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edges++;
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}
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junction1 = junction2;
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weight = 0;
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}
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}
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}
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else
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{
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for (int index = way.nodeIds.Count - 2; index > 0; index--)
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{
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Node currentNode = nodes[way.nodeIds[index]];
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Node nextNode = nodes[way.nodeIds[index - 1]];
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weight += Utils.DistanceBetweenNodes(currentNode, nextNode);
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if (count[way.nodeIds[index - 1]] > 1 || index == 1)
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{
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/*
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* If Node is referenced more than once => Junction
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* If Node is last node of way => Junction
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* Add an edge between two junctions
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*/
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junction2 = nodes[way.nodeIds[index - 1]];
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junction1.edges.Add(new Edge(junction2, weight));
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logger?.Log(LogLevel.VERBOSE, "EDGE {0} -- {1} --> {2}", way.nodeIds[index], weight, way.nodeIds[index - 1]);
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edges++;
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if (!way.oneway)
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{
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junction2.edges.Add(new Edge(junction1, weight));
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logger?.Log(LogLevel.VERBOSE, "EDGE {0} -- {1} --> {2}", way.nodeIds[index - 1], weight, way.nodeIds[index]);
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edges++;
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}
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junction1 = junction2;
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weight = 0;
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}
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}
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}
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}
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reader.Close();
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GC.Collect();
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logger?.Log(LogLevel.DEBUG, "Loaded Edges: {0}", edges);
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return nodes.Where(node => count[node.Key] > 1).ToDictionary(node => node.Key, node => node.Value);
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}
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internal struct Way
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{
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public List<ulong> nodeIds;
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public bool oneway;
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public wayDirection direction;
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public highwayType highway;
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public enum wayDirection { forward, backward }
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public enum highwayType : uint
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{
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NONE = 1,
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motorway = 130,
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trunk = 125,
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primary = 110,
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secondary = 100,
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tertiary = 80,
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unclassified = 40,
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residential = 23,
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motorway_link = 55,
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trunk_link = 50,
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primary_link = 30,
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secondary_link = 25,
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tertiary_link = 24,
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living_street = 20,
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service = 14,
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pedestrian = 12,
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track = 6,
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bus_guideway = 15,
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escape = 3,
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raceway = 4,
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road = 28,
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busway = 13,
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footway = 8,
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bridleway = 7,
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steps = 5,
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corridor = 9,
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path = 10,
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cycleway = 11,
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construction = 2
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}
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public Way()
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{
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this.nodeIds = new List<ulong>();
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this.oneway = false;
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this.direction = wayDirection.forward;
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this.highway = highwayType.NONE;
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}
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public void SetHighwayType(string waytype)
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{
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try
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{
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this.highway = (highwayType)Enum.Parse(typeof(highwayType), waytype, true);
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}catch(Exception)
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{
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this.highway = highwayType.NONE;
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}
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}
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}
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}
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}
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