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annotate pytouhou/utils/matrix.py @ 29:afa91be769ae

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Don't lose time updating off-screen enemies' sprites
author Thibaut Girka <thib@sitedethib.com>
date Fri, 12 Aug 2011 22:03:34 +0200
parents f405b947624d
children e3ba2fa966f6
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1 #TODO: find/learn to use a proper lib
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2
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3 from math import sin, cos
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5 class Matrix(object):
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6 def __init__(self, data=None):
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7 self.data = data or [[0] * 4 for i in xrange(4)]
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9
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10 def mult(self, other_matrix):
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11 d1 = self.data
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12 d2 = other_matrix.data
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13 return Matrix([[sum(d1[i][a] * d2[a][j] for a in xrange(4)) for j in xrange(4)] for i in xrange(4)])
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16 def flip(self):
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17 self.data[0][:] = (-x for x in self.data[0])
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20 def scale(self, x, y, z):
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21 d1 = self.data
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22 d1[0][:] = (a * x for a in d1[0])
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23 d1[1][:] = (a * y for a in d1[1])
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24 d1[2][:] = (a * z for a in d1[2])
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27 def translate(self, x, y, z):
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28 d1 = self.data
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29 a, b, c = (v * m for v, m in zip(d1[3][:3], (x, y, z)))
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30 d1[0][:] = (v + a for v in d1[0])
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31 d1[1][:] = (v + b for v in d1[1])
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32 d1[2][:] = (v + c for v in d1[2])
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35 def rotate_x(self, angle):
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36 d1 = self.data
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37 cos_a = cos(angle)
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38 sin_a = sin(angle)
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39 a = [cos_a * d1[1][i] - sin_a * d1[2][i] for i in range(4)]
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40 b = [sin_a * d1[1][i] + cos_a * d1[2][i] for i in range(4)]
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41 d1[1][:] = a
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42 d1[2][:] = b
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44
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45 def rotate_y(self, angle):
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46 #TODO: check
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47 d1 = self.data
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48 cos_a = cos(angle)
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49 sin_a = sin(angle)
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50 a = [cos_a * d1[0][i] - sin_a * d1[2][i] for i in range(4)]
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51 b = [sin_a * d1[0][i] + cos_a * d1[2][i] for i in range(4)]
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52 d1[0][:] = a
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53 d1[2][:] = b
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56 def rotate_z(self, angle):
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57 d1 = self.data
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58 cos_a = cos(angle)
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59 sin_a = sin(angle)
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60 a = [cos_a * d1[0][i] - sin_a * d1[1][i] for i in range(4)]
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61 b = [sin_a * d1[0][i] + cos_a * d1[1][i] for i in range(4)]
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62 d1[0][:] = a
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63 d1[1][:] = b
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66 @classmethod
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67 def get_translation_matrix(cls, x, y, z):
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68 return cls([[1., 0., 0., x],
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69 [0., 1., 0., y],
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70 [0., 0., 1., z],
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71 [0., 0., 0., 1.]])
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74 @classmethod
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75 def get_scaling_matrix(cls, x, y, z):
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76 return cls([[x, 0., 0., 0.],
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77 [0., y, 0., 0.],
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78 [0., 0., z, 0.],
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79 [0., 0., 0., 1.]])
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82 @classmethod
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83 def get_rotation_matrix(cls, angle, axis):
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84 """Only handles axis = x, y or z."""
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85 cos_a = cos(angle)
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86 sin_a = sin(angle)
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87 if axis == 'x':
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88 return Matrix([[ 1., 0., 0., 0.],
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89 [ 0., cos_a, -sin_a, 0.],
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90 [ 0., sin_a, cos_a, 0.],
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91 [ 0., 0., 0., 1.]])
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92 elif axis == 'y':
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93 return Matrix([[ cos_a, 0., sin_a, 0.],
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94 [ 0., 1., 0., 0.],
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95 [-sin_a, 0., cos_a, 0.],
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96 [ 0., 0., 0., 1.]])
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97 elif axis == 'z':
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98 return Matrix([[ cos_a, -sin_a, 0., 0.],
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99 [ sin_a, cos_a, 0., 0.],
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100 [ 0., 0., 1., 0.],
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101 [ 0., 0., 0., 1.]])
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102 else:
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103 raise Exception
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104