Hilbert curve: Difference between revisions
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m (→Python Functional: Updated primitives. Tidied.) |
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<lang Python>'''Hilbert curve''' |
<lang Python>'''Hilbert curve''' |
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from itertools import (chain, islice |
from itertools import (chain, islice) |
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from inspect import signature |
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def go(xy, tree): |
def go(xy, tree): |
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r = d // 2 |
r = d // 2 |
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| ⚫ | |||
def deltas(v): |
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| ⚫ | |||
xy[0] + (r * v[0]), |
xy[0] + (r * v[0]), |
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xy[1] + (r * v[1]) |
xy[1] + (r * v[1]) |
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) |
) |
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centres = map(deltas, vectors[tree['root']]) |
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) |
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return chain.from_iterable( |
return chain.from_iterable( |
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map(points(r), centres, tree['nest']) |
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) if tree['nest'] else centres |
) if tree['nest'] else centres |
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return |
return go |
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d = w // 2 |
d = w // 2 |
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'''Width of square canvas -> Point list -> SVG string''' |
'''Width of square canvas -> Point list -> SVG string''' |
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def go( |
def go(xys): |
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def points(xy): |
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return str(xy[0]) + ' ' + str(xy[1]) |
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xys |
xs = ' '.join(map(points, xys)) |
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| ⚫ | |||
return '\n'.join( |
return '\n'.join( |
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['<svg xmlns="http://www.w3.org/2000/svg"', |
['<svg xmlns="http://www.w3.org/2000/svg"', |
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] |
] |
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) |
) |
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return |
return go |
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# |
# ------------------------- TEST -------------------------- |
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def main(): |
def main(): |
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'''Testing generation of the SVG for a Hilbert curve''' |
'''Testing generation of the SVG for a Hilbert curve''' |
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hilbertCurve(6) |
hilbertCurve(6) |
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) |
) |
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| ⚫ | |||
# |
# ------------------- GENERIC FUNCTIONS ------------------- |
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# Node :: a -> [Tree a] -> Tree a |
# Node :: a -> [Tree a] -> Tree a |
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def flip(f): |
def flip(f): |
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'''The (curried or uncurried) function f with its |
'''The (curried or uncurried) function f with its |
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arguments reversed. |
arguments reversed. |
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| ⚫ | |||
if 1 < len(signature(f).parameters): |
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return lambda a: lambda b: f(b)(a) |
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| ⚫ | |||
return lambda a: lambda b: f(b)(a) |
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yield v |
yield v |
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v = f(v) |
v = f(v) |
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return |
return go |
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