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@ -6,61 +6,50 @@ 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<UInt64, Node> Import(Logger logger)
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{
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XmlReader reader = XmlReader.Create(new MemoryStream(OSM_Data.map));
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reader.MoveToContent();
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Dictionary<UInt64, Node> nodes = new Dictionary<UInt64, Node>();
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nodeType currentNodeType = nodeType.NULL;
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Node nullNode = new Node();
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Node currentNode = nullNode;
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public static Dictionary<ulong, Node> Import(ref Logger logger)
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{
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List<Way> ways = new List<Way>();
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Dictionary<ulong, Node> nodes = new Dictionary<ulong, Node>();
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bool wayTag = false;
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Way currentWay = new Way();
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/*
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* First iteration
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* Import "ways" with a tag "highway" and add the node-ids to the list of nodes
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*/
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XmlReaderSettings readerSettings = new XmlReaderSettings()
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{
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IgnoreWhitespace = true,
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IgnoreComments = true
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};
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XmlReader reader = XmlReader.Create(new MemoryStream(OSM_Data.map), readerSettings);
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reader.MoveToContent();
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while (reader.Read())
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{
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if (reader.Name == "node" && reader.IsStartElement())
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if (reader.Name == "way" && reader.IsStartElement())
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{
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currentNodeType = nodeType.NODE;
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nodes.Add(
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Convert.ToUInt64(reader.GetAttribute("id")),
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new Node(
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Convert.ToSingle(reader.GetAttribute("lat")),
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Convert.ToSingle(reader.GetAttribute("lon"))
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)
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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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nodes.Add(id, Node.nullnode);
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}
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else if (reader.Name == "way")
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{
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if(currentNodeType == nodeType.WAY)
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{
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ImportWay(currentWay);
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logger.log(loglevel.INFO, "Way nodes: {0}", currentWay.nodes.Count);
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}
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currentNodeType = nodeType.WAY;
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currentNode = nullNode;
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wayTag = true;
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currentWay = new Way();
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reader.GetAttribute("id");
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}else if (reader.Name == "nd" && currentNodeType == nodeType.WAY){
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UInt64 id = Convert.ToUInt64(reader.GetAttribute("ref"));
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if (!nodes.TryGetValue(id, out currentNode))
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{
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logger.log(loglevel.DEBUG, "Node with id {0} not imported.", id);
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}
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else
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{
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currentWay.nodes.Add(currentNode);
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}
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}else if (reader.Name == "tag")
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{
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if(currentNodeType == nodeType.WAY)
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else if (reader.Name == "tag" && wayTag)
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{
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string? value = reader.GetAttribute("v");
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switch (reader.GetAttribute("k"))
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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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switch (key)
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{
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/*case "highway":
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break;*/
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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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@ -81,87 +70,112 @@ namespace OpenStreetMap_Importer
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break;*/
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}
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}
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}
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}
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logger.log(loglevel.INFO, "Loaded. Nodes: {0}", nodes.Count);
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return nodes;
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}
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internal static void ImportWay(Way way)
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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, "Ways: {0}", ways.Count);
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reader.Close();
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reader = XmlReader.Create(new MemoryStream(OSM_Data.map), 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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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 (nodes.ContainsKey(id))
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{
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Console.Read();
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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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nodes[id] = new Node(lat, lon);
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logger.log(loglevel.VERBOSE, "NODE {0} {1} {2}", id, lat, lon);
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}
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}
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}
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logger.log(loglevel.DEBUG, "Nodes: {0}", nodes.Count);
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/*
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* Add connections between nodes based on ways and calculate distance
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*/
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ulong edges = 0;
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foreach(Way way in ways)
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{
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if (way.direction == Way.wayDirection.forward)
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{
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for(int index = 0; index < way.nodes.Count - 1; index++)
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for (int index = 0; index < way.nodeIds.Count - 1; index++)
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{
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Node currentNode = way.nodes[index];
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Node neighborNode = way.nodes[index + 1];
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ushort weight = Convert.ToUInt16(DistanceBetweenNodes(currentNode, neighborNode));
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Node currentNode = nodes[way.nodeIds[index]];
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Node neighborNode = nodes[way.nodeIds[index + 1]];
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ushort weight = Convert.ToUInt16(Utils.DistanceBetweenNodes(currentNode, neighborNode));
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currentNode.edges.Add(new Edge(neighborNode, 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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neighborNode.edges.Add(new Edge(currentNode, weight));
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edges++;
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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.nodes.Count-1; index > 1; index--)
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for (int index = way.nodeIds.Count - 1; index > 1; index--)
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{
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Node currentNode = way.nodes[index];
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Node neighborNode = way.nodes[index - 1];
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ushort weight = Convert.ToUInt16(DistanceBetweenNodes(currentNode, neighborNode));
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Node currentNode = nodes[way.nodeIds[index]];
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Node neighborNode = nodes[way.nodeIds[index - 1]];
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ushort weight = Convert.ToUInt16(Utils.DistanceBetweenNodes(currentNode, neighborNode));
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currentNode.edges.Add(new Edge(neighborNode, 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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neighborNode.edges.Add(new Edge(currentNode, weight));
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edges++;
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}
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}
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}
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}
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internal enum nodeType { NODE, WAY, NULL }
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logger.log(loglevel.DEBUG, "Edges: {0}", edges);
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return nodes;
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}
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internal struct Way
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{
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public List<Node> nodes;
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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 { NONE, motorway, trunk, primary, secondary, tertiary, unclassified, residential, motorway_link, trunk_link, primary_link, secondary_link, tertiary_link, living_street, service, pedestrian, track, bus_guideway, escape, raceway, road, busway, footway, bridleway, steps, corridor, path, cycleway, construction}
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public Way()
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{
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this.nodes = new List<Node>();
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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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}
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this.highway = highwayType.NONE;
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}
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private static double DistanceBetweenNodes(Node n1, Node n2)
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public void setHighwayType(string waytype)
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{
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return DistanceBetweenCoordinates(n1.lat, n1.lon, n2.lat, n2.lon);
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}
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private static double DistanceBetweenCoordinates(float lat1, float lon1, float lat2, float lon2)
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try
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{
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const int earthRadius = 6371;
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double differenceLat = DegreesToRadians(lat2 - lat1);
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double differenceLon = DegreesToRadians(lon2 - lon1);
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double lat1Rads = DegreesToRadians(lat1);
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double lat2Rads = DegreesToRadians(lat2);
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double a = Math.Sin(differenceLat / 2) * Math.Sin(differenceLat / 2) + Math.Sin(differenceLon / 2) * Math.Sin(differenceLon / 2) * Math.Cos(lat1Rads) * Math.Cos(lat2Rads);
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double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
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return earthRadius * c;
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}
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private static double DegreesToRadians(double deg)
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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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return deg * Math.PI / 180.0;
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}
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private static double RadiansToDegrees(double rad)
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{
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return rad * 180.0 / Math.PI;
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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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