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#
# Copyright (c) 2002, 2003, 2004 Art Haas
#
# This file is part of PythonCAD.
#
# PythonCAD 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.
#
# PythonCAD 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 PythonCAD; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# available units
#
import types
MILLIMETERS = 0
MICROMETERS = 1
METERS = 2
KILOMETERS = 3
INCHES = 4
FEET = 5
YARDS = 6
MILES = 7
def get_all_units():
unitlist = []
unitlist.append('Millimeters')
unitlist.append('Micrometers')
unitlist.append('Meters')
unitlist.append('Kilometers')
unitlist.append('Inches')
unitlist.append('Feet')
unitlist.append('Yards')
unitlist.append('Miles')
return unitlist
class Unit(object):
"""A class defining a unit for linear dimensions.
The Unit class is used to establish what unit to
assign distances between points. The class contains
two methods used to scale distance value to and from
an equivalent distance in millimeters.
toMillimeters(): Convert a distance to millimeters
fromMillimeters(): Convert a distance from millimeters
"""
def __init__(self, unit=None):
_unit = unit
if _unit is None:
_unit = MILLIMETERS
if (_unit != MILLIMETERS and
_unit != MICROMETERS and
_unit != METERS and
_unit != KILOMETERS and
_unit != INCHES and
_unit != FEET and
_unit != YARDS and
_unit != MILES):
raise ValueError, "Invalid unit choice: " + str(unit)
self.__unit = _unit
def getUnit(self):
return self.__unit
def getStringUnit(self):
_u = self.__unit
if _u == MILLIMETERS:
_str = 'millimeters'
elif _u == MICROMETERS:
_str = 'micrometers'
elif _u == METERS:
_str = 'meters'
elif _u == KILOMETERS:
_str = 'kilometers'
elif _u == INCHES:
_str = 'inches'
elif _u == FEET:
_str = 'feet'
elif _u == YARDS:
_str = 'yards'
elif _u == MILES:
_str = 'miles'
else:
raise ValueError, "Unexpected unit: %d" % _u
return _str
def setStringUnit(self, unit):
if not isinstance(unit, types.StringTypes):
raise TypeError, "Unexpected unit string: " + str(unit)
_ul = str(unit.lower())
if _ul == 'millimeters':
_unit = MILLIMETERS
elif _ul == 'micrometers':
_unit = MICROMETERS
elif _ul == 'meters':
_unit = METERS
elif _ul == 'kilometers':
_unit = KILOMETERS
elif _ul == 'inches':
_unit = INCHES
elif _ul == 'feet':
_unit = FEET
elif _ul == 'yards':
_unit = YARDS
elif _ul == 'miles':
_unit = MILES
else:
raise ValueError, "Unexpected unit string: %s" % unit
self.__unit = _unit
def setUnit(self, unit):
if (unit != MILLIMETERS and
unit != MICROMETERS and
unit != METERS and
unit != KILOMETERS and
unit != INCHES and
unit != FEET and
unit != YARDS and
unit != MILES):
raise ValueError, "Invalid unit choice: " + str(unit)
self.__unit = unit
unit = property(getUnit, setUnit, None, "Basic unit.")
def toMillimeters(self, value):
"""Scale a value to the equivalent distance in millimeters.
toMillimeters(value)
"""
_v = value
if not isinstance(_v, float):
_v = float(value)
if self.__unit == MILLIMETERS:
_sv = _v
elif self.__unit == MICROMETERS:
_sv = _v * 1e-3
elif self.__unit == METERS:
_sv = _v * 1e3
elif self.__unit == KILOMETERS:
_sv = _v * 1e6
elif self.__unit == INCHES:
_sv = _v * 25.4
elif self.__unit == FEET:
_sv = _v * 304.8
elif self.__unit == YARDS:
_sv = _v * 914.4
elif self.__unit == MILES:
_sv = _v * 1609344.4
else:
raise ValueError, "Undefined unit value! " + str(self.__unit)
return _sv
def fromMillimeters(self, value):
"""Scale a value from an equivalent distance in millimeters.
fromMillimeters(value)
"""
_v = value
if not isinstance(_v, float):
_v = float(value)
if self.__unit == MILLIMETERS:
_sv = _v
elif self.__unit == MICROMETERS:
_sv = _v * 1e3
elif self.__unit == METERS:
_sv = _v * 1e-3
elif self.__unit == KILOMETERS:
_sv = _v * 1e-6
elif self.__unit == INCHES:
_sv = _v / 25.4
elif self.__unit == FEET:
_sv = _v / 304.8
elif self.__unit == YARDS:
_sv = _v / 914.4
elif self.__unit == MILES:
_sv = _v / 1609344.4
else:
raise ValueError, "Undefined unit value! " + str(self.__unit)
return _sv
def unit_string(value):
"""Return a text string for the integer unit value.
unit_string(value)
"""
if value == MILLIMETERS:
_str = 'millimeters'
elif value == MICROMETERS:
_str = 'micrometers'
elif value == METERS:
_str = 'meters'
elif value == KILOMETERS:
_str = 'kilometers'
elif value == INCHES:
_str = 'inches'
elif value == FEET:
_str = 'feet'
elif value == YARDS:
_str = 'yards'
elif value == MILES:
_str = 'miles'
else:
raise ValueError, "Unexpected unit: " + str(value)
return _str
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