view pytouhou/utils/matrix.py @ 127:81e05aed8db5

Fix bullets
author Thibaut Girka <thib@sitedethib.com>
date Sat, 10 Sep 2011 16:13:54 +0200
parents d1c82d43bbf3
children
line wrap: on
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# -*- encoding: utf-8 -*-
##
## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##

#TODO: find/learn to use a proper lib

from math import sin, cos

class Matrix(object):
    def __init__(self, data=None):
        self.data = data or [[0] * 4 for i in xrange(4)]


    def mult(self, other_matrix):
        d1 = self.data
        d2 = other_matrix.data
        return Matrix([[sum(d1[i][a] * d2[a][j] for a in xrange(4)) for j in xrange(4)] for i in xrange(4)])


    def flip(self):
        data = self.data
        a, b, c, d = data[0]
        data[0] = [-a, -b, -c, -d]


    def scale(self, x, y, z):
        d1 = self.data
        d1[0] = [a * x for a in d1[0]]
        d1[1] = [a * y for a in d1[1]]
        d1[2] = [a * z for a in d1[2]]


    def scale2d(self, x, y):
        data = self.data
        d1a, d1b, d1c, d1d = data[0]
        d2a, d2b, d2c, d2d = data[1]
        data[0] = [d1a * x, d1b * x, d1c * x, d1d * x]
        data[1] = [d2a * y, d2b * y, d2c * y, d2d * y]


    def translate(self, x, y, z):
        data = self.data
        a, b, c = data[3][:3]
        a, b, c = a * x, b * y, c * z
        d1a, d1b, d1c, d1d = data[0]
        d2a, d2b, d2c, d2d = data[1]
        d3a, d3b, d3c, d3d = data[2]
        data[0] = [d1a + a, d1b + a, d1c + a, d1d + a]
        data[1] = [d2a + b, d2b + b, d2c + b, d2d + b]
        data[2] = [d3a + c, d3b + c, d3c + c, d3d + c]


    def rotate_x(self, angle):
        d1 = self.data
        cos_a = cos(angle)
        sin_a = sin(angle)
        d1[1], d1[2] = ([cos_a * d1[1][i] - sin_a * d1[2][i] for i in range(4)],
                        [sin_a * d1[1][i] + cos_a * d1[2][i] for i in range(4)])


    def rotate_y(self, angle):
        d1 = self.data
        cos_a = cos(angle)
        sin_a = sin(angle)
        d1[0], d1[2] = ([cos_a * d1[0][i] + sin_a * d1[2][i] for i in range(4)],
                        [- sin_a * d1[0][i] + cos_a * d1[2][i] for i in range(4)])


    def rotate_z(self, angle):
        d1 = self.data
        cos_a = cos(angle)
        sin_a = sin(angle)
        d1[0], d1[1] = ([cos_a * d1[0][i] - sin_a * d1[1][i] for i in range(4)],
                        [sin_a * d1[0][i] + cos_a * d1[1][i] for i in range(4)])


    @classmethod
    def get_translation_matrix(cls, x, y, z):
        return cls([[1., 0., 0., x],
                    [0., 1., 0., y],
                    [0., 0., 1., z],
                    [0., 0., 0., 1.]])


    @classmethod
    def get_scaling_matrix(cls, x, y, z):
        return cls([[x,  0., 0., 0.],
                    [0., y,  0., 0.],
                    [0., 0., z,  0.],
                    [0., 0., 0., 1.]])


    @classmethod
    def get_rotation_matrix(cls, angle, axis):
        """Only handles axis = x, y or z."""
        cos_a = cos(angle)
        sin_a = sin(angle)
        if axis == 'x':
            return Matrix([[    1.,     0.,     0.,     0.],
                           [    0.,  cos_a, -sin_a,     0.],
                           [    0.,  sin_a,  cos_a,     0.],
                           [    0.,     0.,     0.,     1.]])
        elif axis == 'y':
            return Matrix([[ cos_a,     0.,  sin_a,     0.],
                           [    0.,     1.,     0.,     0.],
                           [-sin_a,     0.,  cos_a,     0.],
                           [    0.,     0.,     0.,     1.]])
        elif axis == 'z':
            return Matrix([[ cos_a, -sin_a,     0.,     0.],
                           [ sin_a,  cos_a,     0.,     0.],
                           [    0.,     0.,     1.,     0.],
                           [    0.,     0.,     0.,     1.]])
        else:
            raise Exception