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annotate pytouhou/utils/interpolator.pyx @ 397:c5ba11ede097

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Don’t duplicate values in sprite rendering data.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 06 Feb 2013 21:41:05 +0100
parents fab7ad2f0d8b
children d778db08190f
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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16 class Interpolator(object):
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17 __slots__ = ('values', 'start_values', 'end_values', 'start_frame', 'end_frame', '_frame', '_formula')
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18 def __init__(self, values=(), start_frame=0, end_values=(), end_frame=0, formula=None):
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19 self.values = tuple(values)
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20 self.start_values = tuple(values)
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21 self.end_values = tuple(end_values)
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22 self.start_frame = start_frame
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23 self.end_frame = end_frame
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24 self._frame = 0
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25 self._formula = formula or (lambda x: x)
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28 def __nonzero__(self):
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29 return self._frame < self.end_frame
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32 def set_interpolation_start(self, frame, values):
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33 self.start_values = tuple(values)
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34 self.start_frame = frame
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37 def set_interpolation_end(self, frame, values):
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38 self.end_values = tuple(values)
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39 self.end_frame = frame
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42 def set_interpolation_end_frame(self, end_frame):
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43 self.end_frame = end_frame
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46 def set_interpolation_end_values(self, values):
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47 self.end_values = tuple(values)
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50 def update(self, frame):
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51 self._frame = frame
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52 if frame >= self.end_frame - 1: #XXX: skip the last interpolation step
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53 # This bug is replicated from the original game
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54 self.values = self.end_values
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55 self.start_values = self.end_values
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56 self.start_frame = frame
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57 else:
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58 coeff = self._formula(float(frame - self.start_frame) / float(self.end_frame - self.start_frame))
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59 self.values = [start_value + coeff * (end_value - start_value)
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60 for (start_value, end_value) in zip(self.start_values, self.end_values)]
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