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Pos = Struct.new(:x, :y) do
def move(dir)
case dir
when :up
Pos.new(x, y - 1)
when :right
Pos.new(x + 1, y)
when :down
Pos.new(x, y + 1)
when :left
Pos.new(x - 1, y)
end
end
def dir_from(pos)
diff_x = x - pos.x
diff_y = y - pos.y
case Pos.new(diff_x, diff_y)
when Pos.new(0, -1)
:up
when Pos.new(1, 0)
:right
when Pos.new(0, 1)
:down
when Pos.new(-1, 0)
:left
end
end
def to_s()
"(#{x}, #{y})"
end
end
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