/usr/share/pyshared/tegaki/mathutils.py is in python-tegaki 0.3.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | # -*- coding: utf-8 -*-
# Copyright (C) 2008 The Tegaki project contributors
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Contributors to this file:
# - Mathieu Blondel
from math import sqrt, hypot, atan2, pi
def euclidean_distance(v1, v2):
assert(len(v1) == len(v2))
return sqrt(sum([(v2[i] - v1[i]) ** 2 for i in range(len(v1))]))
def cartesian_to_polar(x, y):
"""
Cartesian to polar coordinates conversion.
r is the distance to the point.
teta is the angle to the point between 0 and 2 pi.
"""
r = hypot(x, y)
teta = atan2(y, x) + pi
return (r, teta)
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