IEnumerator findPath(Vector3 startPos, Vector3 endPos)
{
Vector3[] waypoints = new Vector3[0];
bool pathSuccess = false;
Node startNode = grid.NodeFromWorldPoint(startPos);
Node targetNode = grid.NodeFromWorldPoint(endPos);
if (targetNode.walkable && startNode.walkable)
{
Heap <Node> openSet = new Heap <Node> (grid.MaxSize);
HashSet <Node> closedSet = new HashSet <Node> ();
openSet.Add(startNode);
while (openSet.Count > 0)
{
Node currentNode = openSet.RemoveFirst();
closedSet.Add(currentNode);
if (currentNode == targetNode)
{
pathSuccess = true;
break;
}
foreach (Node neighbor in grid.GetNeighbors(currentNode))
{
if (!neighbor.walkable || closedSet.Contains(neighbor))
{
continue;
}
int newMovementCostToNeighbor = currentNode.Gcost + getDistance(currentNode, neighbor);
if (newMovementCostToNeighbor < neighbor.Gcost || !openSet.Contains(neighbor))
{
neighbor.Gcost = newMovementCostToNeighbor;
neighbor.Hcost = getDistance(neighbor, targetNode);
neighbor.parent = currentNode;
if (!openSet.Contains(neighbor))
{
openSet.Add(neighbor);
}
}
}
}
}
yield return(null);
if (pathSuccess)
{
waypoints = RetracePath(startNode, targetNode);
}
requestManager.FinishedProcessing(waypoints, pathSuccess);
}
IEnumerator FindPath(Vector3 _start, Vector3 _end)
{
//if they're on the same node, then return the nodes position
Vector3[] path = new Vector3[0];
bool pathSuccess = false;
PathNode start = tileGrid.GetTileAtPos(_start).GetComponent <PathNode>();
PathNode target = tileGrid.GetTileAtPos(_end).GetComponent <PathNode>();
if (!start || !target)
{
yield return(null);
}
if (start != target)
{
//list of open and closed nodes
openNodes = new Heap <PathNode>(tileGrid.xSize * tileGrid.ySize);
closedNodes = new HashSet <PathNode>();
openNodes.Add(start);
int x = 0;
while (openNodes.Count > 0)
{
currentNode = openNodes.RemoveFirst();
closedNodes.Add(currentNode);
if (currentNode == target)
{
pathSuccess = true;
break;
}
foreach (PathNode n in tileGrid.GetNeighbours(currentNode))
{
if (closedNodes.Contains(n))
{
continue;
}
if (!n.walkable)
{
continue;
}
int f = currentNode.g + GetDistance(currentNode, n) + n.weight;
if (f < n.g || !openNodes.Contains(n))
{
n.g = f;
n.h = GetDistance(n, target);
n.ParentNode = currentNode;
if (!openNodes.Contains(n))
{
openNodes.Add(n);
}
}
x++;
}
if (closedNodes.Count >= maxSize - 1)
{
currentNode = null;
break;
}
}
}
yield return(null);
if (pathSuccess)
{
path = RetracePath(start, target);
}
requestManager.FinishedProcessing(path, pathSuccess);
}
private IEnumerator FindPath(Vector3 startPos, Vector3 targetPos)
{
Stopwatch sw = new Stopwatch();
sw.Start();
Vector3[] waypoints = new Vector3[0];
bool pathSuccess = false;
Node startNode = grid.NodeFromWorldPoint(startPos);
Node targetNode = grid.NodeFromWorldPoint(targetPos);
if (startNode.Walkable && targetNode.Walkable)
{
Heap <Node> openSet = new Heap <Node>(grid.MaxSize);
HashSet <Node> closeSet = new HashSet <Node>();
openSet.Add(startNode);
while (openSet.Count > 0)
{
Node currentNode = openSet.RemoveFirst();
closeSet.Add(currentNode);
if (currentNode == targetNode)
{
sw.Stop();
print("path found: " + sw.ElapsedMilliseconds + "ms");
pathSuccess = true;
break;
}
foreach (Node neighbour in grid.GetNeighbours(currentNode))
{
if (!neighbour.Walkable || closeSet.Contains(neighbour))
{
continue;
}
int newMovementCost = currentNode.GCost + GetDistance(currentNode, neighbour);
if (newMovementCost < neighbour.GCost || !openSet.Contains(neighbour)) //if shorter or unvisited!
{
neighbour.GCost = newMovementCost;
neighbour.HCost = GetDistance(neighbour, targetNode);
neighbour.parent = currentNode;
if (!openSet.Contains(neighbour))
{
openSet.Add(neighbour);
}
else
{
openSet.UpdateItem(neighbour);
}
}
}
}
}
yield return(null);
if (pathSuccess)
{
waypoints = RetracePath(startNode, targetNode);
}
requestManager.FinishedProcessing(waypoints, pathSuccess);
}