/// <summary>
/// Create a new A* path.
/// </summary>
/// <param name="pathingGrid">The aStarGrid the path is on.</param>
public AStarContext(PathingGrid pathingGrid)
{
_pathingGrid = pathingGrid;
_openSet = new HashSet <AStarNode>();
_closedSet = new HashSet <AStarNode>();
_cache = new Dictionary <int, AStarNode>();
}
/// <summary>
/// Create a grid from a TileMap object.
/// </summary>
/// <param name="tileMap">The map to create the grid from.</param>
/// <param name="layerId">The tile layer to create the grid from.</param>
/// <param name="impassableTiles">The list of image ids considered impassable.</param>
public static PathingGrid FromTileMap <T>(TileMap <T> tileMap, int layerId, int[] impassableTiles) where T : TransformRenderable
{
if (layerId == -1 || tileMap.TiledMap == null || layerId > tileMap.TiledMap.Layers.Count - 1)
{
return(null);
}
TmxLayer layer = tileMap.TiledMap.Layers[layerId];
var newGrid = new PathingGrid(layer.Width, layer.Height, tileMap.TileSize);
for (var x = 0; x < newGrid.Width; x++)
{
for (var y = 0; y < newGrid.Height; y++)
{
int tileId = x + y * layer.Width;
int imageId = tileMap.GetTileImageIdInLayer(tileId, layerId, out int _);
bool solid = impassableTiles.IndexOf(imageId) != -1;
if (solid)
{
newGrid.SetWalkable(x, y, false);
}
}
}
return(newGrid);
}
/// <summary>
/// Destroy, and free memory.
/// </summary>
public void Dispose()
{
_closedSet.Clear();
_openSet.Clear();
_cache.Clear();
_closedSet = null;
_openSet = null;
_pathingGrid = null;
}
