public static int ShortestDistance(this PM_Maze maze, Vec2i root, Vec2i destination)
{
if (maze.BoundingRect().Contains(root) == false)
{
throw new SystemException("root not contained in maze");
}
if (maze.BoundingRect().Contains(root) == false)
{
throw new SystemException("destination not contained in maze");
}
if (root == destination)
{
return(0);
}
List <Vec2i> shortestPath = maze.BFS_ShortestPath(root, destination);
return(shortestPath.Count - 1);
}
