add
Adds a directed edge from node1 to node2. Tiles are matched by their (x, y) coordinates, so data is ignored.
NOTE: For performance, the tiles are not validated. Both must be within grid bounds and not deleted, otherwise the behavior is undefined.
Parameters
node1
The starting tile of the edge.
node2
The ending tile of the edge.
weight
The weight of the edge, for example used to calculate distances with shortestPathsFrom. Defaults to 1.0.
Throws
If a tile is outside the grid or has been deleted.