private bool IsDiagonalJumpPoint(Direction direction, PathfindingNode currentNode)
{
// If we're going diagonally need to check all cardinals.
// I just just using casts int casts and offset to make it smaller but brain no workyand it wasn't working.
// From NorthEast we check (Closed / Open) S - SE, W - NW
PathfindingNode openNeighborOne;
PathfindingNode closedNeighborOne;
PathfindingNode openNeighborTwo;
PathfindingNode closedNeighborTwo;
switch (direction)
{
case Direction.NorthEast:
openNeighborOne = currentNode.GetNeighbor(Direction.SouthEast);
closedNeighborOne = currentNode.GetNeighbor(Direction.South);
openNeighborTwo = currentNode.GetNeighbor(Direction.NorthWest);
closedNeighborTwo = currentNode.GetNeighbor(Direction.West);
break;
case Direction.SouthEast:
openNeighborOne = currentNode.GetNeighbor(Direction.NorthEast);
closedNeighborOne = currentNode.GetNeighbor(Direction.North);
openNeighborTwo = currentNode.GetNeighbor(Direction.SouthWest);
closedNeighborTwo = currentNode.GetNeighbor(Direction.West);
break;
case Direction.SouthWest:
openNeighborOne = currentNode.GetNeighbor(Direction.NorthWest);
closedNeighborOne = currentNode.GetNeighbor(Direction.North);
openNeighborTwo = currentNode.GetNeighbor(Direction.SouthEast);
closedNeighborTwo = currentNode.GetNeighbor(Direction.East);
break;
case Direction.NorthWest:
openNeighborOne = currentNode.GetNeighbor(Direction.SouthWest);
closedNeighborOne = currentNode.GetNeighbor(Direction.South);
openNeighborTwo = currentNode.GetNeighbor(Direction.NorthEast);
closedNeighborTwo = currentNode.GetNeighbor(Direction.East);
break;
default:
throw new ArgumentOutOfRangeException();
}
if ((closedNeighborOne == null || Utils.GetTileCost(_pathfindingArgs, currentNode, closedNeighborOne) == null) &&
openNeighborOne != null && Utils.GetTileCost(_pathfindingArgs, currentNode, openNeighborOne) != null)
{
return(true);
}
if ((closedNeighborTwo == null || Utils.GetTileCost(_pathfindingArgs, currentNode, closedNeighborTwo) == null) &&
openNeighborTwo != null && Utils.GetTileCost(_pathfindingArgs, currentNode, openNeighborTwo) != null)
{
return(true);
}
return(false);
}
/// <summary>
/// Check to see if the node is a jump point (only works for cardinal directions)
/// </summary>
private bool IsCardinalJumpPoint(Direction direction, PathfindingNode currentNode)
{
PathfindingNode openNeighborOne;
PathfindingNode closedNeighborOne;
PathfindingNode openNeighborTwo;
PathfindingNode closedNeighborTwo;
switch (direction)
{
case Direction.North:
openNeighborOne = currentNode.GetNeighbor(Direction.NorthEast);
closedNeighborOne = currentNode.GetNeighbor(Direction.East);
openNeighborTwo = currentNode.GetNeighbor(Direction.NorthWest);
closedNeighborTwo = currentNode.GetNeighbor(Direction.West);
break;
case Direction.East:
openNeighborOne = currentNode.GetNeighbor(Direction.NorthEast);
closedNeighborOne = currentNode.GetNeighbor(Direction.North);
openNeighborTwo = currentNode.GetNeighbor(Direction.SouthEast);
closedNeighborTwo = currentNode.GetNeighbor(Direction.South);
break;
case Direction.South:
openNeighborOne = currentNode.GetNeighbor(Direction.SouthEast);
closedNeighborOne = currentNode.GetNeighbor(Direction.East);
openNeighborTwo = currentNode.GetNeighbor(Direction.SouthWest);
closedNeighborTwo = currentNode.GetNeighbor(Direction.West);
break;
case Direction.West:
openNeighborOne = currentNode.GetNeighbor(Direction.NorthWest);
closedNeighborOne = currentNode.GetNeighbor(Direction.North);
openNeighborTwo = currentNode.GetNeighbor(Direction.SouthWest);
closedNeighborTwo = currentNode.GetNeighbor(Direction.South);
break;
default:
throw new ArgumentOutOfRangeException();
}
if ((closedNeighborOne == null || !Utils.Traversable(_pathfindingArgs.CollisionMask, closedNeighborOne.CollisionMask)) &&
(openNeighborOne != null && Utils.Traversable(_pathfindingArgs.CollisionMask, openNeighborOne.CollisionMask)))
{
return(true);
}
if ((closedNeighborTwo == null || !Utils.Traversable(_pathfindingArgs.CollisionMask, closedNeighborTwo.CollisionMask)) &&
(openNeighborTwo != null && Utils.Traversable(_pathfindingArgs.CollisionMask, openNeighborTwo.CollisionMask)))
{
return(true);
}
return(false);
}
private PathfindingNode GetJumpPoint(PathfindingNode currentNode, Direction direction, PathfindingNode endNode)
{
var count = 0;
while (count < 1000)
{
count++;
var nextNode = currentNode.GetNeighbor(direction);
// We'll do opposite DirectionTraversable just because of how the method's setup
// Nodes should be 2-way anyway.
if (nextNode == null ||
Utils.GetTileCost(_pathfindingArgs, currentNode, nextNode) == null)
{
return(null);
}
if (nextNode == endNode)
{
return(endNode);
}
// Horizontal and vertical are treated the same i.e.
// They only check in their specific direction
// (So Going North means you check NorthWest and NorthEast to see if we're a jump point)
// Diagonals also check the cardinal directions at the same time at the same time
// See https://harablog.wordpress.com/2011/09/07/jump-point-search/ for original description
switch (direction)
{
case Direction.East:
if (IsCardinalJumpPoint(direction, nextNode))
{
return(nextNode);
}
break;
case Direction.NorthEast:
if (IsDiagonalJumpPoint(direction, nextNode))
{
return(nextNode);
}
if (GetJumpPoint(nextNode, Direction.North, endNode) != null || GetJumpPoint(nextNode, Direction.East, endNode) != null)
{
return(nextNode);
}
break;
case Direction.North:
if (IsCardinalJumpPoint(direction, nextNode))
{
return(nextNode);
}
break;
case Direction.NorthWest:
if (IsDiagonalJumpPoint(direction, nextNode))
{
return(nextNode);
}
if (GetJumpPoint(nextNode, Direction.North, endNode) != null || GetJumpPoint(nextNode, Direction.West, endNode) != null)
{
return(nextNode);
}
break;
case Direction.West:
if (IsCardinalJumpPoint(direction, nextNode))
{
return(nextNode);
}
break;
case Direction.SouthWest:
if (IsDiagonalJumpPoint(direction, nextNode))
{
return(nextNode);
}
if (GetJumpPoint(nextNode, Direction.South, endNode) != null || GetJumpPoint(nextNode, Direction.West, endNode) != null)
{
return(nextNode);
}
break;
case Direction.South:
if (IsCardinalJumpPoint(direction, nextNode))
{
return(nextNode);
}
break;
case Direction.SouthEast:
if (IsDiagonalJumpPoint(direction, nextNode))
{
return(nextNode);
}
if (GetJumpPoint(nextNode, Direction.South, endNode) != null || GetJumpPoint(nextNode, Direction.East, endNode) != null)
{
return(nextNode);
}
break;
default:
throw new ArgumentOutOfRangeException(nameof(direction), direction, null);
}
currentNode = nextNode;
}
Logger.WarningS("pathfinding", "Recursion found in JPS pathfinder");
return(null);
}
