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annotate pytouhou/utils/vector.pyx @ 517:dec43940f092

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Don’t crash if SDL2_ttf couldn’t render a specific string.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sat, 07 Dec 2013 21:37:55 +0100
parents cb5c68598ab0
children 7f016dfbdfb1
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74471afbac37 Add a programmable pipeline renderer, and a --fixed-pipeline switch to use the old one.
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2012 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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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.math cimport sqrt
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18 cdef class Vector:
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19 def __init__(self, float x, float y, float z):
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20 self.x = x
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21 self.y = y
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22 self.z = z
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25 cdef Vector sub(self, Vector other):
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26 cdef float x, y, z
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27
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28 x = self.x - other.x
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29 y = self.y - other.y
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30 z = self.z - other.z
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31
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32 return Vector(x, y, z)
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35 cdef Vector cross(Vector vec1, Vector vec2):
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36 return Vector(vec1.y * vec2.z - vec2.y * vec1.z,
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37 vec1.z * vec2.x - vec2.z * vec1.x,
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38 vec1.x * vec2.y - vec2.x * vec1.y)
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41 cdef float dot(Vector vec1, Vector vec2):
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42 return vec1.x * vec2.x + vec2.y * vec1.y + vec1.z * vec2.z
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45 cdef Vector normalize(Vector vec):
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46 cdef float normal
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47
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48 normal = 1 / sqrt(vec.x * vec.x + vec.y * vec.y + vec.z * vec.z)
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49 return Vector(vec.x * normal, vec.y * normal, vec.z * normal)