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51 lines
1.2 KiB
51 lines
1.2 KiB
import math
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# version with 2 separate functions
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def distance(p1, p2):
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return math.sqrt((p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2)
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def perimeter(polygon):
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perimeter = 0
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points = polygon + [polygon[0]]
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for i in range(len(polygon)):
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perimeter += distance(points[i], points[i + 1])
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return perimeter
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# oop version with classes
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class Point:
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def __init__(self, x, y):
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self.x = x
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self.y = y
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def distance(self, p2):
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return math.sqrt((self.x - p2.x) ** 2 + (self.y - p2.y) ** 2)
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class Polygon:
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def __init__(self, points = []):
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self.vertices = []
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for point in points:
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if isinstance(point, tuple):
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# *point splits point into 2 parameters for Point.__init__()
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point = Point(*point)
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self.vertices.append(point)
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def add_point(self, point):
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self.vertices.append((point))
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def perimeter(self):
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perimeter = 0
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try:
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points = self.vertices + [self.vertices[0]]
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except IndexError:
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print("The polygon has no points.")
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else:
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for i in range(len(self.vertices)):
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perimeter += points[i].distance(points[i + 1])
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return perimeter
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