Merge remote-tracking branch 'origin/master'

src/bus.c

@@ -20,14 +20,25 @@ int GetBusPosition()
     b = 0;
     rail_node_t *p = rails;
     a = the_bus->rail_node_pos->id;//指向站点的指针以及这个指针对应的站台id
-
+    if (a == 1 && (the_bus->distance < 0))
+    {
+        while(p->id != p->last_node->id)
+        {
+            b += p->next_node_distance;
+            p = p->next_node;
+        }
+        b += p->next_node_distance;
+        c = b + (the_bus->distance);
+    }
+    else
+    {
         while (p->id != a){
             b += p->next_node_distance;
             p = p->next_node;
         }
 
         c = b + (the_bus->distance);
-
+    }
     return c;
 }