Fix boundary box; fix view box detection.

Detect view box out of overpass turbo JSON data.

map_machine/boundary_box.py

@@ -159,9 +159,16 @@ class BoundaryBox:
 
         return f"{left:.3f},{bottom:.3f},{right:.3f},{top:.3f}"
 
+    def update(self, coordinates: np.ndarray) -> None:
+        """Make the boundary box cover coordinates."""
+        self.left = min(self.left, coordinates[1])
+        self.bottom = min(self.bottom, coordinates[0])
+        self.right = max(self.right, coordinates[1])
+        self.top = max(self.top, coordinates[0])
+
     def combine(self, other: "BoundaryBox") -> None:
         """Combine with another boundary box."""
         self.left = min(self.left, other.left)
-        self.right = min(self.right, other.right)
         self.bottom = min(self.bottom, other.bottom)
-        self.top = min(self.top, other.top)
+        self.right = max(self.right, other.right)
+        self.top = max(self.top, other.top)

map_machine/osm_reader.py

@@ -372,6 +372,14 @@ class OSMData:
                 node = OSMNode.parse_from_structure(element)
                 node_map[node.id_] = node
                 self.add_node(node)
+                if not self.view_box:
+                    self.view_box = BoundaryBox(
+                        node.coordinates[1],
+                        node.coordinates[0],
+                        node.coordinates[1],
+                        node.coordinates[0],
+                    )
+                self.view_box.update(node.coordinates)
 
         for element in structure["elements"]:
             if element["type"] == "way":