public bool TryGetPath(Vector2 startPosition, Vector2 goalPosition, NavGrid navGrid, NavGridAgentModel agentModel, out List <Vector2> path)
{
if (navGrid == null || navGrid.IsWithinNavGridBounds(goalPosition) == false)
{
path = null;
return(false);
}
goalFound = false;
var startIndexVector = navGrid.PositionToIndex(startPosition);
var goalIndexVector = navGrid.PositionToIndex(goalPosition);
if (navGrid.IsNodeOfType(goalIndexVector.x, goalIndexVector.y, NavGrid.NodeType.wall))
{
path = null;
return(false);
}
var predictSize = (int)Heuristics.GetManhattan(startPosition, goalPosition) * 2;
predictSize = Mathf.Max(MINIMAL_DICTIONARY_SIZE, predictSize);
var cameFrom = new Dictionary <Vector3Int, Node>(predictSize); //Dictionary use to recreate path
var jumpNodeData = new Dictionary <Vector2Int, JumpData>(predictSize);
var open = new SimplePriorityQueue <Node, float>();
Node current = null;
Node start = new Node(startIndexVector);
open.Enqueue(start, 0);
cameFrom.Add(new Vector3Int(start.x, start.y, 0), null);
while (open.Count != 0)
{
current = open.Dequeue();
//early exit if goal found
if (current.position == goalIndexVector)
{
goalFound = true;
break;
}
bool jumpOpportunity = false;
if (current.jumpCost == 0)
{
var distanceToGoal = Heuristics.GetManhattan(current.position, goalIndexVector);
jumpOpportunity = current.y < goalIndexVector.y && distanceToGoal <= agentModel.maxJumpHeight * 2 ||
HesJumpOpportunity(navGrid, current.x, current.y, agentModel.maxJumpHeight);
}
foreach (var neightbor in navGrid.GetNeightbors(current.position))
{
var atCeling = false;
var grounded = false;
//continue if neightbor is the start node
if (neightbor == start.position)
{
continue;
}
if (navGrid.IsGroundedNode(neightbor.x, neightbor.y))
{
grounded = true;
}
else if (navGrid.IsCelingNode(neightbor.x, neightbor.y))
{
atCeling = true;
}
var jumpCost = GetJumpCost(current, neightbor, atCeling, grounded, agentModel);
if (grounded == false)
{
//Prevent starting the jump if there is non location to jump to
if (current.jumpCost == 0 && jumpCost == 3 && jumpOpportunity == false)
{
continue;
}
//Allow horizontal movement only from even nodes
if (current.jumpCost >= 0 && current.jumpCost % 2 != 0 && current.x != neightbor.x)
{
continue;
}
//Prevent from moving up further than the agent max jump height allow
if (current.jumpCost >= agentModel.maxJumpHeight * 2 && current.y < neightbor.y)
{
continue;
}
//After first 3 cells horizontal movement is allowed every 4-th cell (on cells with jumpvalue of 13,21,29...)
if (jumpCost >= agentModel.maxJumpHeight * 2 + 6 && neightbor.x != current.x &&
(jumpCost - (agentModel.maxJumpHeight * 2 + 6)) % 8 != 3)
{
continue;
}
}
Vector3Int location = new Vector3Int(neightbor.x, neightbor.y, jumpCost);
//-1f means node was not visited
float oldCost = cameFrom.TryGetValue(location, out Node oldNode) ? oldNode.cost : -1f;
var cost = current.cost + 1 + jumpCost * 0.001f;
if (oldCost == -1f || oldCost > cost)
{
if (jumpCost != 0)
{
var hesNodeJumpData = jumpNodeData.TryGetValue(neightbor, out JumpData jumpData);
if (hesNodeJumpData && jumpData.lowerJumpValue <= jumpCost)
{
if (jumpCost % 2 != 0 || jumpData.horizontalMovement || jumpCost >= agentModel.maxJumpHeight * 2 + 6)
{
continue;
}
}
jumpData.lowerJumpValue = jumpCost;
jumpData.horizontalMovement |= jumpCost % 2 == 0;
if (hesNodeJumpData)
{
jumpNodeData[neightbor] = jumpData;
}
else
{
jumpNodeData.Add(neightbor, jumpData);
}
}
if (oldCost == -1)
{
cameFrom.Add(location, current);
}
else
{
cameFrom[location] = current;
}
Node newNode = new Node(neightbor)
{
cost = cost,
distance = Heuristics.GetManhattan(current.position, goalIndexVector),
jumpCost = jumpCost
};
open.Enqueue(newNode, newNode.Priority);
}
}
}
//DEBUG-------------------------------
debugger.SetSerachTiles(cameFrom, navGrid);
//------------------------------------
path = goalFound ? pathReconstractor.RecreatePath(cameFrom, start, current, navGrid) : null;
return(goalFound);
}
private int GetJumpCost(Node current, Vector2Int neightbor, bool atCeling, bool grounded, NavGridAgentModel agentModel)
{
var output = 0;
if (atCeling)
{
if (current.x != neightbor.x)
{
output = Mathf.Max(agentModel.maxJumpHeight * 2 + 1, current.jumpCost + 1);
}
else
{
output = Mathf.Max(agentModel.maxJumpHeight * 2, current.jumpCost + 2);
}
}
else if (grounded)
{
output = 0;
}
else if (current.y < neightbor.y) // jumping
{
if (current.jumpCost < 2)
{
output = 3;
}
else
{
output = current.jumpCost + (current.jumpCost % 2 == 0 ? 2 : 1);
}
}
else if (current.y > neightbor.y) // falling
{
output = Mathf.Max(agentModel.maxJumpHeight * 2, current.jumpCost + (current.jumpCost % 2 == 0 ? 2 : 1));
}
else if (grounded == false && current.x != neightbor.x) // walling off the egde
{
output = current.jumpCost + 1;
}
return(output);
}
