A Collection of Code Snippets in as Many Programming Languages as Possible

This project is maintained by TheRenegadeCoder

Welcome to the Convex Hull in Python page! Here, you’ll find the source code for this program as well as a description of how the program works.

```
from math import sqrt
import sys
usage = 'Usage: please provide at least 3 x and y coordinates as separate lists (e.g. "100, 440, 210")'
def dist(point1, point2):
x1, y1 = point1
x2, y2 = point2
return sqrt(abs((x2 - x1)**2 + (y2 - y1)**2))
def farthest(point, set_of_points):
d = [(dist(point, i), i) for i in set_of_points]
d = list(set(d))
d = sorted(d, reverse=True)
return d[0][1]
def orient(point1, point2, point3):
x1, y1 = point1
x2, y2 = point2
x3, y3 = point3
val = ((x2-x1) * (y3-y1)) - ((y2 - y1) * (x3-x1))
if val == 0:
return 0
elif val > 0:
return 1
else:
return 2
def next_hurdle(setofpoints, pivot, final_list):
z = setofpoints
final_list = final_list[1:]
k = []
for i in z:
if i in final_list:
continue
bool1 = 1
for j in z:
if orient(pivot, i, j) == 1:
bool1 = 0
break
if bool1 == 1:
k.append(i)
return farthest(pivot, k)
def foo(z):
final_list = []
topmost = [(i, j) for i, j in z if j == max(Y)]
v1 = sorted(topmost)[0]
final_list.append(v1)
next_point = v1[0], v1[1] + 1
pivot = v1
while next_point != v1:
next_point = next_hurdle(z, pivot, final_list)
pivot = next_point
final_list.append(next_point)
return final_list
if __name__ == '__main__':
if len(sys.argv) != 3:
print(usage)
sys.exit()
X = [i.strip() for i in sys.argv[1].split(',') if i]
Y = [i.strip() for i in sys.argv[2].split(',') if i]
if len(X) != len(Y) or len(X) < 3 or not all(x.isdigit() for x in X) or not all(y.isdigit() for y in Y):
print(usage)
sys.exit()
X = [int(i) for i in X]
Y = [int(i) for i in Y]
Z = list(set((zip(X, Y))))
convex_polygon_coords = foo(Z)
for coord in convex_polygon_coords:
print(coord)
```

Convex Hull in Python was written by:

- Jeremy Grifski
- Vicrobot

If you see anything you’d like to change or update, please consider contributing.

**Note**: The solution shown above is the current solution in the Sample Programs repository as of May 14 2022 15:37:34. The solution was first committed on Oct 22 2019 05:05:49. As a result, documentation below may be outdated.

No ‘How to Implement the Solution’ section available. Please consider contributing.

No ‘How to Run the Solution’ section available. Please consider contributing.