/// <summary>
/// Convert the tilemap into a better data structure
/// </summary>
private void analyzeRooms()
{
var rooms = new List <Map.Room>();
// pass 1 - find all rooms
for (int r = 0; r < structure.Height; r++)
{
for (int c = 0; c < structure.Width; c++)
{
var tile = structure.GetTile(c, r);
if (tile == null)
{
continue;
}
Map.TileOri ori(TmxLayerTile t)
{
return(analyzeWallTile((Map.TileKind)(t.Gid - worldTileset.FirstGid), tileDirection(t)));
}
var tileOri = ori(tile);
if (tileOri == Map.TileOri.UpLeft)
{
var topEdge = r;
var leftEdge = c;
var scanFirst = default(Point);
var scanOpen = 0;
var openings = new List <Map.Door>();
// line-scan setup
void updateScan(TmxLayerTile t, Point p, Direction dir)
{
if (t != null)
{
if (scanOpen > 0)
{
openings.Add(new Map.Door(scanFirst, p, dir));
scanFirst = default;
scanOpen = 0;
}
}
else
{
if (scanOpen == 0)
{
// start the count
scanFirst = p;
}
scanOpen++;
}
}
// scan for an UpRight
var ulTile = tile;
var urTile = default(TmxLayerTile);
var rightEdge = -1;
for (int sx = leftEdge; sx < structure.Width; sx++)
{
// pass left-to-right along top
var scTile = structure.GetTile(sx, topEdge);
updateScan(scTile, new Point(sx, topEdge), Direction.Up);
if (scTile == null)
{
continue;
}
if (ori(scTile) == Map.TileOri.UpRight)
{
urTile = scTile;
rightEdge = sx;
break;
}
}
if (urTile == null)
{
break;
}
var drTile = default(TmxLayerTile);
var downEdge = -1;
for (int sy = topEdge; sy < structure.Height; sy++)
{
// pass top-to-bottom along right
var scTile = structure.GetTile(rightEdge, sy);
updateScan(scTile, new Point(rightEdge, sy), Direction.Right);
if (scTile == null)
{
continue;
}
if (ori(scTile) == Map.TileOri.DownRight)
{
drTile = scTile;
downEdge = sy;
break;
}
}
if (drTile == null)
{
break;
}
var dlTile = default(TmxLayerTile);
for (int sx = rightEdge; sx >= 0; sx--)
{
// pass right-to left along down
var scTile = structure.GetTile(sx, downEdge);
updateScan(scTile, new Point(sx, downEdge), Direction.Down);
if (scTile == null)
{
continue;
}
if (ori(scTile) == Map.TileOri.DownLeft)
{
dlTile = scTile;
break;
}
}
if (dlTile == null)
{
break;
}
// finally, check the left side
for (int sy = downEdge; sy >= 0; sy--)
{
// pass down-to-top along left
var scTile = structure.GetTile(leftEdge, sy);
updateScan(scTile, new Point(leftEdge, sy), Direction.Left);
if (scTile == null)
{
continue;
}
if (ori(scTile) == Map.TileOri.UpLeft)
{
// we found her again
break;
}
}
// all 4 corners have been found, create a room
var room = new Map.Room(new Point(leftEdge, topEdge), new Point(rightEdge, downEdge));
room.doors = openings;
foreach (var door in openings)
{
// set local room of all doors
door.roomLocal = room;
}
rooms.Add(room);
Global.log.trace($"room ul:{room.ul}, dr{room.dr}, doors:{room.doors.Count})");
}
}
}
// pass 2 - determine room links
foreach (var room in rooms)
{
foreach (var door in room.doors)
{
// average the door pos
var inPos = door.doorCenter;
var(dx, dy) = DirectionStepper.stepIn(door.dir);
// now scan in direction
var distScanned = 0;
// set initial pos
var ix = inPos.X;
var iy = inPos.Y;
// set scan pos
var sx = ix;
var sy = iy;
while (distScanned < ROOM_LINK_DIST)
{
// update scan vars
distScanned = Math.Abs(ix - sx) + Math.Abs(iy - sy);
sx += dx;
sy += dy;
// check if we're inside another room
var sPt = new Point(sx, sy);
// TODO: optimize this checking
// check if we're in any other room
var otherRoom = default(Map.Room);
foreach (var testRoom in rooms)
{
if (testRoom.inRoom(sPt))
{
otherRoom = testRoom;
break;
}
}
if (otherRoom != null)
{
// set up the connection
door.roomOther = otherRoom;
room.links.Add(otherRoom);
Global.log.trace(
$"room link [dist: {distScanned}] from Room[@{room.center}] to Room[@{otherRoom.center}]");
break;
}
}
}
}
// set up room graph
mapRepr.roomGraph = new RoomGraph(rooms);
}
public void analyze()
{
// 1. build mapping from room to center nodes
foreach (var room in roomGraph.rooms)
{
// create unconnected center nodes
sngNodes[room] = new DelayedNode(new StructuralNavigationGraph.Node(room.center)
{
room = room // store link to room
});
}
// 2. create nodes of indirection
foreach (var nodePair in sngNodes)
{
var room = nodePair.Key;
var centerNode = nodePair.Value;
foreach (var door in room.doors)
{
// calculate positions of inner and outer door nodes
var doorCenter = door.doorCenter;
var(dx, dy) = DirectionStepper.stepIn(door.dir);
var innerDoor = doorCenter + new Point(-dx * StructuralNavigationGraph.DOOR_NODE_DIST,
-dy * StructuralNavigationGraph.DOOR_NODE_DIST);
var outerDoor = doorCenter + new Point(dx * StructuralNavigationGraph.DOOR_NODE_DIST,
dy * StructuralNavigationGraph.DOOR_NODE_DIST);
var innerDoorNode = new DelayedNode(new StructuralNavigationGraph.Node(innerDoor));
var outerDoorNode = new DelayedNode(new StructuralNavigationGraph.Node(outerDoor)
{
edge = new StructuralNavigationGraph.RoomLink(door.roomLocal, door.roomOther)
});
centerNode.addPendingLink(innerDoorNode); // attach CENTER - INNER
innerDoorNode.addPendingLink(outerDoorNode); // attach INNER - OUTER
// when collapsed, we should get CENTER - INNER - OUTER (a "spike")
}
centerNode.collapse();
}
var centralNodes = sngNodes.Values.Select(x => x.centerNode).ToList();
allNodes.AddRange(centralNodes);
// now, we have all our nodes of the form
// CENTER with [INNER - OUTER] spikes for each door
// 3. next, we need to merge these spikes by door link
// and merge all these delayed nodes into a graph
var spikeNodes = new List <StructuralNavigationGraph.Node>();
foreach (var nodePair in sngNodes)
{
var room = nodePair.Key;
var centerNode = nodePair.Value;
var gn = centerNode.centerNode;
// do a BFS on the node. we are going to make a list of spike nodes.
var visited = new Dictionary <StructuralNavigationGraph.Node, bool>();
var queue = new Queue <StructuralNavigationGraph.Node>();
// mark the starting node as visited, and queue it
visited[gn] = true;
queue.Enqueue(gn);
while (queue.Count > 0)
{
// process the current vertex
var vertex = queue.Dequeue();
// add to node list
if (!allNodes.Contains(vertex))
{
allNodes.Add(vertex);
}
if (vertex.edge != null)
{
spikeNodes.Add(vertex);
}
// get all adjacent, and enqueue any unvisited
foreach (var adjacent in vertex.links)
{
if (!visited.ContainsKey(adjacent) || !visited[adjacent]) // not visited
{
visited[adjacent] = true; // mark visited
queue.Enqueue(adjacent); // enqueue
}
}
}
}
// then, we will x2 loop through all spike nodes and match spike to spike via link equiv
foreach (var spk1 in spikeNodes)
{
foreach (var spk2 in spikeNodes)
{
if (spk1 == spk2)
{
continue;
}
// now, match spike-to-spike
if (spk1.edge.equiv(spk2.edge))
{
// we have a match!
spk1.links.Add(spk2);
spk2.links.Add(spk1);
}
}
}
// this should give us a graph!e
}