[捕捉](%E6%8D%95%E6%8D%89.md) [栅格](%E6%A0%85%E6%A0%BC.md) [正交](%E6%AD%A3%E4%BA%A4.md) [对象捕捉](%E5%AF%B9%E8%B1%A1%E6%8D%95%E6%8D%89.md)