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                            ![](https://img.kancloud.cn/7d/cc/7dcc02b0d4c54b22e14c1a84332859ea_2053x757.png)
![](https://img.kancloud.cn/08/c6/08c6fb92834b433135f5785aaa8ee479_2043x340.png)
參考知乎文章中的做法，利用向量叉積的異同來判斷
![](https://img.kancloud.cn/f7/ba/f7ba21113207ca8f2b0d5c102e514f91_1118x849.png)
[# 如何判別凹多邊形](https://zhuanlan.zhihu.com/p/350992915)

凸多邊形頂點的網格邊界是凸多邊形本身，凹多邊形頂點求得的邊界頂點數量一定少于曲線本身，基于此腳本如下：
![](https://img.kancloud.cn/ac/4c/ac4c9cae4bf6cdaa940194e1e2ca9d7a_1709x430.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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