private void BuildNodesFromWay(XmlNode way)
{
XmlNodeList referencedNodes = way.SelectNodes("nd");
ulong wayID = XmlAttributeParser.GetAttribute <ulong>("id", way.Attributes);
Transform nodeAttachParent = GameObject.Find("Nodes").transform;
if (graphData.metadata.ContainsID(wayID))
{
var wayMetadata = graphData.metadata.GetItem(wayID);
if (wayMetadata.containsMetatagPair(key: "boundary", value: "postal_code") ||
wayMetadata.containsMetatagKey("frequency"))
{
// Skip uninteresting osm data
return;
}
for (int i = 0; i < referencedNodes.Count; i++)
{
ulong nodeID = XmlAttributeParser
.GetAttribute <ulong>("ref", referencedNodes[i].Attributes);
if (wayMetadata.containsComponentWithID(nodeID))
{
// In certain cases a single node may appear twice
// in a single osm way (forming a loop)
NodeComponent existingNode = graphData.nodes.GetItem(nodeID);
wayMetadata.addComponent(existingNode);
}
else if (graphData.nodes.ContainsID(nodeID))
{
// Often single node may be present in multiple
// osm ways, if node with certain ID is already created,
// again only add the reference
NodeComponent existingNode = graphData.nodes.GetItem(nodeID);
wayMetadata.addComponent(existingNode);
}
else
{
/* BUILD NEW NODE */
XmlNode nodeData = preloadNodes[nodeID];
nodeBuilder.reset();
nodeBuilder.passNodeData(nodeData);
nodeBuilder.buildNodeID();
nodeBuilder.buildNodePositionWithOffset(BoundsCentre);
nodeBuilder.processMetadata(wayID);
NodeComponent newNode = nodeBuilder.getNode();
graphData.nodes.AddItem(newNode.getID(), newNode);
wayMetadata.addComponent(newNode);
newNode.gameObject.transform.parent = nodeAttachParent;
}
}
}
else
{
throw new NamedException($"Way with {wayID} ID was not instantantiated.");
}
}