python intersection lines

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Miles
29 Oct 2016
1def line_intersection(line1, line2):
2    xdiff = (line1[0][0] - line1[1][0], line2[0][0] - line2[1][0])
3    ydiff = (line1[0][1] - line1[1][1], line2[0][1] - line2[1][1])
4
5    def det(a, b):
6        return a[0] * b[1] - a[1] * b[0]
7
8    div = det(xdiff, ydiff)
9    if div == 0:
10       raise Exception('lines do not intersect')
11
12    d = (det(*line1), det(*line2))
13    x = det(d, xdiff) / div
14    y = det(d, ydiff) / div
15    return x, y
16
17print (line_intersection((A, B), (C, D)))
18
19# And FYI, I would use tuples instead of lists for your points. E.g.
20# A = (X, Y)
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