# Copyright (C) 2015 Chintalagiri Shashank
#
# This file is part of Tendril.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
This file is part of tendril
See the COPYING, README, and INSTALL files for more information
"""
import math
from decimal import Decimal
from .lengths import Length
[docs]class CartesianPoint(object):
unit = 'mm'
def __init__(self, x, y):
self.x = self._norm_repr(x)
self.y = self._norm_repr(y)
@staticmethod
[docs] def _norm_repr(v):
return Decimal(v)
def __eq__(self, other):
if self.x == other.x and self.y == other.y:
return True
else:
return False
[docs]class CartesianLineSegment(object):
def __init__(self, p1, p2):
self.p1 = p1
self.p2 = p2
if p1 == p2:
raise Exception("Line can't have zero length")
if p1.unit != p2.unit:
raise ValueError
[docs] def x(self, t):
return self.p1.x + t * (self.p2.x - self.p1.x)
[docs] def y(self, t):
return self.p1.y + t * (self.p2.y - self.p1.y)
[docs] def t_x(self, x):
if self.p1.x != self.p2.x:
return (Decimal(x) - self.p1.x) / (self.p2.x - self.p1.x)
else:
raise ZeroDivisionError
[docs] def t_y(self, y):
if self.p1.y != self.p2.y:
return (Decimal(y) - self.p1.y) / (self.p2.y - self.p1.y)
else:
raise ZeroDivisionError
[docs] def length(self):
return Length(str(
math.sqrt((self.p2.x - self.p1.x)**2 + (self.p2.y - self.p1.y)**2)
) + self.p1.unit)
def __contains__(self, p):
try:
t = self.t_x(p.x)
if 0 <= t <= 1:
try:
if t == self.t_y(p.y):
return True
else:
return False
except ZeroDivisionError:
if p.y == self.p1.y:
return True
else:
return False
except ZeroDivisionError:
t = self.t_y(p.y)
if 0 <= t <= 1 and p.x == self.p1.x:
return True
else:
return False