private void MoveToOpenList(GameObject _tile, int _GCost)
{
EnvironmentBlockScript _tileScript = _tile.GetComponent <EnvironmentBlockScript>();
if (_tileScript.Fcost != -1)
{
if (_tileScript.Gcost > _GCost)
{
_tileScript.Gcost = _GCost;
_tileScript.Fcost = _GCost + _tileScript.Hcost;
_tileScript.ParentTile = CurrentTile;
}
_tileScript.Open = true;
}
else
{
Vector2 tilePosition = _tile.GetComponent <Transform>().position;
Vector2 destinationPosition = DestinationTile.GetComponent <Transform>().position;
float xDifference = Mathf.Abs(destinationPosition.x - tilePosition.x) / 8;
float yDifference = Mathf.Abs(destinationPosition.y - tilePosition.y) / 8;
int HCost = Mathf.RoundToInt(xDifference + yDifference);
_tileScript.Hcost = HCost;
_tileScript.Gcost = _GCost;
_tileScript.Fcost = HCost + _GCost;
if (_tile != CurrentTile)
{
_tileScript.ParentTile = CurrentTile;
}
OpenList.Add(_tile);
_tileScript.Open = true;
}
}
private GameObject AStar(GameObject _destinationTile)
{
// We need to define the path to the player, and then return the first tile in that path.
// --- SETUP ---
UpdateFloorTile();
SourceTile = CurrentFloorTile;
DestinationTile = _destinationTile;
CurrentTile = SourceTile;
MoveToOpenList(CurrentTile, 0);
int currentGCost;
bool Done = false;
while (!Done)
{
EnvironmentBlockScript CurrentTileScript = CurrentTile.GetComponent <EnvironmentBlockScript>();
currentGCost = CurrentTileScript.Gcost;
// Going through tiles north, east, south, west.
// The north tile
GameObject northTile = CurrentTileScript.northTile;
bool northValid = false;
if (northTile != null)
{
northValid = IsTileValid(northTile);
if (northValid)
{
MoveToOpenList(northTile, currentGCost + 10);
}
}
// The east tile
GameObject eastTile = CurrentTileScript.eastTile;
bool eastValid = false;
if (eastTile != null)
{
eastValid = IsTileValid(eastTile);
if (eastValid)
{
MoveToOpenList(eastTile, currentGCost + 10);
}
}
// The south tile
GameObject southTile = CurrentTileScript.southTile;
bool southValid = false;
if (southTile != null)
{
southValid = IsTileValid(southTile);
if (southValid)
{
MoveToOpenList(southTile, currentGCost + 10);
}
}
// The west tile
GameObject westTile = CurrentTileScript.westTile;
bool westValid = false;
if (westTile != null)
{
westValid = IsTileValid(westTile);
if (westValid)
{
MoveToOpenList(westTile, currentGCost + 10);
}
}
// Move that tile from the open list to the closed list
MoveToClosedList(CurrentTile);
if (OpenList.Count == 0)
{
Done = true;
break;
}
int lowestFCost = 0;
GameObject lowestFCostTile = null;
for (int i = 0; i < OpenList.Count; i++)
{
int IFCost = OpenList[i].GetComponent <EnvironmentBlockScript>().Fcost;
if (i == 0)
{
lowestFCost = IFCost;
lowestFCostTile = OpenList[i];
}
else if (IFCost < lowestFCost)
{
lowestFCost = IFCost;
lowestFCostTile = OpenList[i];
}
}
CurrentTile = lowestFCostTile;
if (CurrentTile == DestinationTile)
{
Done = true;
}
}
if (CurrentTile == DestinationTile)
{
while (CurrentTile.GetComponent <EnvironmentBlockScript>().ParentTile != SourceTile)
{
CurrentTile = CurrentTile.GetComponent <EnvironmentBlockScript>().ParentTile;
}
}
else
{
CurrentTile = CurrentFloorTile;
}
return(CurrentTile);
}