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Viewing changes to cocos/path.py

  • Committer: facundo at com
  • Date: 2011-05-14 18:13:25 UTC
  • mfrom: (67.1.4 v3rel)
  • Revision ID: facundo@taniquetil.com.ar-20110514181325-614h8kjz32w5cmoy
Refactor back

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Lines of Context:
cocos/path.py
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class Path:
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    def at(self, t):
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        pass
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class Bezier(Path):
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    def __init__(self, a, b, ac, bc):
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        self.a = a
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        self.b = b
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        self.ac = ac
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        self.bc = bc
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    def at(self, t):
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        def calc(i):
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            a = self.a[i]
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            b = self.ac[i]
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            c = self.bc[i]
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            d = self.b[i]
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            return ( 
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                ((1-t)**3) * a + 
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                3*t*((1-t)**2)*b + 
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                3*(t**2)*(1-t)*c +
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                (t**3)*d
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                )
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        return calc(0), calc(1)
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    def __repr__(self):
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        return "Bezier( (%i,%i), (%i,%i), (%i, %i), (%i,%i) )"%(
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                self.a[0], self.a[0],
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                self.b[0], self.b[1],
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                self.ac[0], self.ac[1],
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                self.bc[0], self.bc[1],
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            )
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