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dimension.py
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dimension.py
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# -*- coding: utf-8 -*-
# This file is part of 3dgen, a free 3d model generator for EDA
#
# Copyright (C) 2017 José I. Romero <jir@exp1.com.ar>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License (GPL)
# as published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
# for detail see the LICENCE text file.
#
# 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library 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
#
# This project is based on the work of Maurice (easyw) and
# Hasan Yavuz ÖZDERYA (hyOzd) you can find the original files at:
# https://github.com/easyw/kicad-3d-models-in-freecad
from math import sqrt
import re
class Dimension():
_nominal = None
_min = None
_max = None
def __init__(self, value, tol=None):
if isinstance(value, str):
if '..' in value:
self.__init__(tuple(map(float, value.split('..'))))
elif '+-' in value:
_val, _tol = value.split('+-')
self.__init__(float(_val), tol=float(_tol))
else:
_val = float(re.split(r'[+-]',value)[0])
_tol = tuple(sorted(map(float, re.findall(r'([+\-][0-9.]*)', value))))
self.__init__(_val, tol=_tol)
elif isinstance(value, (int, float)): # Value plus tolerance
self._nominal = float(value)
if not tol: # No tolerance
self._max = self._min = self._nominal
elif isinstance(tol, tuple): # Asymetric tolerance (-, +)
self._min = self._nominal - abs(float(tol[0]))
self._max = self._nominal + abs(float(tol[1]))
elif isinstance(tol, (int, float)): # Symmetric tolerance
self._min = self._nominal - float(tol)
self._max = self._nominal + float(tol)
else:
raise ValueError("Bad tolerance")
elif isinstance(value, tuple): # Range (min, [nominal], max)
self._min = float(value[0])
self._max = float(value[-1])
if len(value) == 3 and value[1] is not None:
self._nominal = float(value[1])
@property
def tol_p(self):
if self._nominal != None:
return self._max - self._nominal
@property
def tol_m(self):
if self._nominal != None:
return self._nominal - self._min
@property
def max(self):
return self._max
@property
def min(self):
return self._min
@property
def nom(self):
if self._nominal != None:
return self._nominal
else:
return (self._min + self._max)*0.5
def __str__(self):
if self._nominal is None:
return str(self._min) + '..' + str(self._max)
elif self.tol_p == self.tol_m:
return str(self._nominal) + '+-' + str(self.tol_p)
else:
return (str(self._nominal) + '+' + str(self.tol_p)
+ '-' + str(self.tol_m))
def __repr__(self):
return "Dimension('{}')".format(self.__str__())
def __add__(self, x):
if isinstance(x, Dimension):
tol = self._max - self._min
xtol = x._max - x._min
worst_tol = tol + xtol
rms_tol = sqrt(tol**2+xtol**2)
_max = self._max + x._max - (worst_tol-rms_tol)/2
_min = self._min + x._min + (worst_tol-rms_tol)/2
if self._nominal is not None and x._nominal is not None:
_nominal = self._nominal + x._nominal
else:
_nominal = None
if _max < _min: # If we changed sign, swap max and min
_max, _min = _min, _max
return Dimension((_min, _nominal, _max))
elif isinstance(x, (int, float)):
return self + Dimension(x)
else:
raise ValueError()
def __radd__(self, x):
return self.__add__(x)
def __sub__(self, x):
return self + (-x)
def __rsub__(self, x):
return x + (-self)
def __mul__(self, x):
if isinstance(x, (int, float)):
_max = self._max * x
_min = self._min * x
if self._nominal is not None:
_nominal = self._nominal * x
else:
_nominal = None
else:
raise ValueError()
if _max < _min: # If we changed sign, swap max and min
_max, _min = _min, _max
return Dimension((_min, _nominal, _max))
def __rmul__(self, x):
return self.__mul__(x)
def __neg__(self):
return self.__mul__(-1)