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annotate pytouhou/utils/interpolator.pyx @ 538:1abb6f7db8cc

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Don’t retrieve the keyboard_state pointer at each frame.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Thu, 24 Apr 2014 20:01:42 +0200
parents d778db08190f
children e15672733c93
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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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14
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15 from libc.stdlib cimport malloc, free
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17
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18 cdef class Interpolator:
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19 def __init__(self, tuple values, unsigned long start_frame=0, tuple end_values=None,
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20 unsigned long end_frame=0, formula=None):
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21 self._length = len(values)
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22 self._values = <double*>malloc(self._length * sizeof(double))
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23 self.start_values = <double*>malloc(self._length * sizeof(double))
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24 self.end_values = <double*>malloc(self._length * sizeof(double))
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25 for i in xrange(self._length):
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26 self._values[i] = values[i]
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27 self.start_values[i] = self._values[i]
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28 if end_values is not None:
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29 for i in xrange(self._length):
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30 self.end_values[i] = end_values[i]
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31 self.start_frame = start_frame
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32 self.end_frame = end_frame
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33 self._frame = 0
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34 self._formula = formula
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35
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36
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37 def __dealloc__(self):
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38 free(self.end_values)
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39 free(self.start_values)
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40 free(self._values)
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41
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42
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43 property values:
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44 def __get__(self):
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45 return tuple([self._values[i] for i in xrange(self._length)])
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48 def __nonzero__(self):
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49 return self._frame < self.end_frame
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51
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52 cpdef set_interpolation_start(self, unsigned long frame, tuple values):
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53 for i in xrange(self._length):
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54 self.start_values[i] = values[i]
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55 self.start_frame = frame
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58 cpdef set_interpolation_end(self, unsigned long frame, tuple values):
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59 for i in xrange(self._length):
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60 self.end_values[i] = values[i]
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61 self.end_frame = frame
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64 cpdef set_interpolation_end_frame(self, unsigned long end_frame):
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65 self.end_frame = end_frame
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68 cpdef set_interpolation_end_values(self, tuple values):
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69 for i in xrange(self._length):
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70 self.end_values[i] = values[i]
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73 cpdef update(self, unsigned long frame):
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74 cdef double coeff
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75
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76 self._frame = frame
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77 if frame + 1 >= self.end_frame: #XXX: skip the last interpolation step
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78 # This bug is replicated from the original game
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79 for i in xrange(self._length):
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80 self._values[i] = self.end_values[i]
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81 self.start_values[i] = self.end_values[i]
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82 self.start_frame = frame
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83 else:
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84 coeff = float(frame - self.start_frame) / float(self.end_frame - self.start_frame)
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85 if self._formula is not None:
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86 coeff = self._formula(coeff)
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87 for i in xrange(self._length):
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88 start_value = self.start_values[i]
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89 end_value = self.end_values[i]
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90 self._values[i] = start_value + coeff * (end_value - start_value)