fix propagation

README.md

@@ -47,11 +47,13 @@ The algorithm made the following images from these patterns :
 - mountains tiles
 - polka tiles
 - roads tiles
+- rail tiles
 
 ![generated circuit image](/doc/images/circuit.png)
 ![generated circuit 2 image](/doc/images/circuit_2.png)
 ![generated demo image](/doc/images/demo.png)
 ![generated demo tracks image](/doc/images/demo_tracks.png)
 ![generated mountains image](/doc/images/mountains.png)
 ![generated polka image](/doc/images/polka.png)
-![generated roads image](/doc/images/roads.png)
+![generated roads image](/doc/images/roads.png)
+![generated rail image](/doc/images/rail.png)

src/WFC.js

@@ -70,10 +70,10 @@ function propagate_info(grid, tiles, cell, dir, visited_cells) {
               bool ||
               (tiles[state].isTileAllowed(tiles[new_state], side) &&
                 tiles[new_state].isTileAllowed(tiles[state], (side + 2) % 4)),
-            true
+            false
           );
       });
       if (len != new_cell.states.length)
-        propagate_info(grid, tiles, new_cell, side, visited_cells);
+        propagate_info(grid, tiles, new_cell, -1, visited_cells);
     });
 }