Shoelace formula for polygonal area: Difference between revisions
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m (→{{header|Python}}: Minor rearrangement for symmetry, legibility) |
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30.0 |
30.0 |
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>>> </lang> |
>>> </lang> |
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Or, defined in terms of '''reduce''' and '''cycle''': |
Or, defined in terms of '''reduce''' and '''cycle''': |
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'''Area of polygon with vertices |
'''Area of polygon with vertices |
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at (x, y) points in xys.''' |
at (x, y) points in xys.''' |
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def go(a, tpl): |
def go(a, tpl): |
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| ⚫ | |||
l, r = a |
l, r = a |
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| ⚫ | |||
return (l + x * dy, r + y * dx) |
return (l + x * dy, r + y * dx) |
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(nl, nr) = reduce( |
(nl, nr) = reduce( |
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go, |
go, |
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