给我一个CH算法的python代码
时间: 2023-04-02 20:04:41 浏览: 71
以下是一个CH算法的Python代码:
```
def cross(p1, p2, p3):
return (p2[] - p1[]) * (p3[1] - p1[1]) - (p2[1] - p1[1]) * (p3[] - p1[])
def upper_hull(points):
points.sort()
upper = []
for p in points:
while len(upper) >= 2 and cross(upper[-2], upper[-1], p) <= :
upper.pop()
upper.append(p)
return upper
def lower_hull(points):
points.sort(reverse=True)
lower = []
for p in points:
while len(lower) >= 2 and cross(lower[-2], lower[-1], p) <= :
lower.pop()
lower.append(p)
return lower
def convex_hull(points):
if len(points) <= 1:
return points
upper = upper_hull(points)
lower = lower_hull(points)
return upper[:-1] + lower[:-1]
```
注意:这只是一个示例代码,可能并不完整或准确。