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-# Copyright (c) 2007, Robert Coup <robert.coup@onetrackmind.co.nz>
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without modification,
-# are permitted provided that the following conditions are met:
-#
-# 1. Redistributions of source code must retain the above copyright notice,
-# this list of conditions and the following disclaimer.
-#
-# 2. Redistributions in binary form must reproduce the above copyright
-# notice, this list of conditions and the following disclaimer in the
-# documentation and/or other materials provided with the distribution.
-#
-# 3. Neither the name of Distance nor the names of its contributors may be used
-# to endorse or promote products derived from this software without
-# specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#
-"""
-Distance and Area objects to allow for sensible and convienient calculation
-and conversions.
-
-Authors: Robert Coup, Justin Bronn, Riccardo Di Virgilio
-
-Inspired by GeoPy (http://exogen.case.edu/projects/geopy/)
-and Geoff Biggs' PhD work on dimensioned units for robotics.
-"""
-__all__ = ['A', 'Area', 'D', 'Distance']
-from decimal import Decimal
-
-from django.utils.functional import total_ordering
-from django.utils import six
-
-NUMERIC_TYPES = six.integer_types + (float, Decimal)
-AREA_PREFIX = "sq_"
-
-def pretty_name(obj):
- return obj.__name__ if obj.__class__ == type else obj.__class__.__name__
-
-
-@total_ordering
-class MeasureBase(object):
- STANDARD_UNIT = None
- ALIAS = {}
- UNITS = {}
- LALIAS = {}
-
- def __init__(self, default_unit=None, **kwargs):
- value, self._default_unit = self.default_units(kwargs)
- setattr(self, self.STANDARD_UNIT, value)
- if default_unit and isinstance(default_unit, six.string_types):
- self._default_unit = default_unit
-
- def _get_standard(self):
- return getattr(self, self.STANDARD_UNIT)
-
- def _set_standard(self, value):
- setattr(self, self.STANDARD_UNIT, value)
-
- standard = property(_get_standard, _set_standard)
-
- def __getattr__(self, name):
- if name in self.UNITS:
- return self.standard / self.UNITS[name]
- else:
- raise AttributeError('Unknown unit type: %s' % name)
-
- def __repr__(self):
- return '%s(%s=%s)' % (pretty_name(self), self._default_unit,
- getattr(self, self._default_unit))
-
- def __str__(self):
- return '%s %s' % (getattr(self, self._default_unit), self._default_unit)
-
- # **** Comparison methods ****
-
- def __eq__(self, other):
- if isinstance(other, self.__class__):
- return self.standard == other.standard
- else:
- return NotImplemented
-
- def __lt__(self, other):
- if isinstance(other, self.__class__):
- return self.standard < other.standard
- else:
- return NotImplemented
-
- # **** Operators methods ****
-
- def __add__(self, other):
- if isinstance(other, self.__class__):
- return self.__class__(default_unit=self._default_unit,
- **{self.STANDARD_UNIT: (self.standard + other.standard)})
- else:
- raise TypeError('%(class)s must be added with %(class)s' % {"class":pretty_name(self)})
-
- def __iadd__(self, other):
- if isinstance(other, self.__class__):
- self.standard += other.standard
- return self
- else:
- raise TypeError('%(class)s must be added with %(class)s' % {"class":pretty_name(self)})
-
- def __sub__(self, other):
- if isinstance(other, self.__class__):
- return self.__class__(default_unit=self._default_unit,
- **{self.STANDARD_UNIT: (self.standard - other.standard)})
- else:
- raise TypeError('%(class)s must be subtracted from %(class)s' % {"class":pretty_name(self)})
-
- def __isub__(self, other):
- if isinstance(other, self.__class__):
- self.standard -= other.standard
- return self
- else:
- raise TypeError('%(class)s must be subtracted from %(class)s' % {"class":pretty_name(self)})
-
- def __mul__(self, other):
- if isinstance(other, NUMERIC_TYPES):
- return self.__class__(default_unit=self._default_unit,
- **{self.STANDARD_UNIT: (self.standard * other)})
- else:
- raise TypeError('%(class)s must be multiplied with number' % {"class":pretty_name(self)})
-
- def __imul__(self, other):
- if isinstance(other, NUMERIC_TYPES):
- self.standard *= float(other)
- return self
- else:
- raise TypeError('%(class)s must be multiplied with number' % {"class":pretty_name(self)})
-
- def __rmul__(self, other):
- return self * other
-
- def __truediv__(self, other):
- if isinstance(other, self.__class__):
- return self.standard / other.standard
- if isinstance(other, NUMERIC_TYPES):
- return self.__class__(default_unit=self._default_unit,
- **{self.STANDARD_UNIT: (self.standard / other)})
- else:
- raise TypeError('%(class)s must be divided with number or %(class)s' % {"class":pretty_name(self)})
-
- def __div__(self, other): # Python 2 compatibility
- return type(self).__truediv__(self, other)
-
- def __itruediv__(self, other):
- if isinstance(other, NUMERIC_TYPES):
- self.standard /= float(other)
- return self
- else:
- raise TypeError('%(class)s must be divided with number' % {"class":pretty_name(self)})
-
- def __idiv__(self, other): # Python 2 compatibility
- return type(self).__itruediv__(self, other)
-
- def __bool__(self):
- return bool(self.standard)
-
- def __nonzero__(self): # Python 2 compatibility
- return type(self).__bool__(self)
-
- def default_units(self, kwargs):
- """
- Return the unit value and the default units specified
- from the given keyword arguments dictionary.
- """
- val = 0.0
- default_unit = self.STANDARD_UNIT
- for unit, value in six.iteritems(kwargs):
- if not isinstance(value, float): value = float(value)
- if unit in self.UNITS:
- val += self.UNITS[unit] * value
- default_unit = unit
- elif unit in self.ALIAS:
- u = self.ALIAS[unit]
- val += self.UNITS[u] * value
- default_unit = u
- else:
- lower = unit.lower()
- if lower in self.UNITS:
- val += self.UNITS[lower] * value
- default_unit = lower
- elif lower in self.LALIAS:
- u = self.LALIAS[lower]
- val += self.UNITS[u] * value
- default_unit = u
- else:
- raise AttributeError('Unknown unit type: %s' % unit)
- return val, default_unit
-
- @classmethod
- def unit_attname(cls, unit_str):
- """
- Retrieves the unit attribute name for the given unit string.
- For example, if the given unit string is 'metre', 'm' would be returned.
- An exception is raised if an attribute cannot be found.
- """
- lower = unit_str.lower()
- if unit_str in cls.UNITS:
- return unit_str
- elif lower in cls.UNITS:
- return lower
- elif lower in cls.LALIAS:
- return cls.LALIAS[lower]
- else:
- raise Exception('Could not find a unit keyword associated with "%s"' % unit_str)
-
-class Distance(MeasureBase):
- STANDARD_UNIT = "m"
- UNITS = {
- 'chain' : 20.1168,
- 'chain_benoit' : 20.116782,
- 'chain_sears' : 20.1167645,
- 'british_chain_benoit' : 20.1167824944,
- 'british_chain_sears' : 20.1167651216,
- 'british_chain_sears_truncated' : 20.116756,
- 'cm' : 0.01,
- 'british_ft' : 0.304799471539,
- 'british_yd' : 0.914398414616,
- 'clarke_ft' : 0.3047972654,
- 'clarke_link' : 0.201166195164,
- 'fathom' : 1.8288,
- 'ft': 0.3048,
- 'german_m' : 1.0000135965,
- 'gold_coast_ft' : 0.304799710181508,
- 'indian_yd' : 0.914398530744,
- 'inch' : 0.0254,
- 'km': 1000.0,
- 'link' : 0.201168,
- 'link_benoit' : 0.20116782,
- 'link_sears' : 0.20116765,
- 'm': 1.0,
- 'mi': 1609.344,
- 'mm' : 0.001,
- 'nm': 1852.0,
- 'nm_uk' : 1853.184,
- 'rod' : 5.0292,
- 'sears_yd' : 0.91439841,
- 'survey_ft' : 0.304800609601,
- 'um' : 0.000001,
- 'yd': 0.9144,
- }
-
- # Unit aliases for `UNIT` terms encountered in Spatial Reference WKT.
- ALIAS = {
- 'centimeter' : 'cm',
- 'foot' : 'ft',
- 'inches' : 'inch',
- 'kilometer' : 'km',
- 'kilometre' : 'km',
- 'meter' : 'm',
- 'metre' : 'm',
- 'micrometer' : 'um',
- 'micrometre' : 'um',
- 'millimeter' : 'mm',
- 'millimetre' : 'mm',
- 'mile' : 'mi',
- 'yard' : 'yd',
- 'British chain (Benoit 1895 B)' : 'british_chain_benoit',
- 'British chain (Sears 1922)' : 'british_chain_sears',
- 'British chain (Sears 1922 truncated)' : 'british_chain_sears_truncated',
- 'British foot (Sears 1922)' : 'british_ft',
- 'British foot' : 'british_ft',
- 'British yard (Sears 1922)' : 'british_yd',
- 'British yard' : 'british_yd',
- "Clarke's Foot" : 'clarke_ft',
- "Clarke's link" : 'clarke_link',
- 'Chain (Benoit)' : 'chain_benoit',
- 'Chain (Sears)' : 'chain_sears',
- 'Foot (International)' : 'ft',
- 'German legal metre' : 'german_m',
- 'Gold Coast foot' : 'gold_coast_ft',
- 'Indian yard' : 'indian_yd',
- 'Link (Benoit)': 'link_benoit',
- 'Link (Sears)': 'link_sears',
- 'Nautical Mile' : 'nm',
- 'Nautical Mile (UK)' : 'nm_uk',
- 'US survey foot' : 'survey_ft',
- 'U.S. Foot' : 'survey_ft',
- 'Yard (Indian)' : 'indian_yd',
- 'Yard (Sears)' : 'sears_yd'
- }
- LALIAS = dict([(k.lower(), v) for k, v in ALIAS.items()])
-
- def __mul__(self, other):
- if isinstance(other, self.__class__):
- return Area(default_unit=AREA_PREFIX + self._default_unit,
- **{AREA_PREFIX + self.STANDARD_UNIT: (self.standard * other.standard)})
- elif isinstance(other, NUMERIC_TYPES):
- return self.__class__(default_unit=self._default_unit,
- **{self.STANDARD_UNIT: (self.standard * other)})
- else:
- raise TypeError('%(distance)s must be multiplied with number or %(distance)s' % {
- "distance" : pretty_name(self.__class__),
- })
-
-
-class Area(MeasureBase):
- STANDARD_UNIT = AREA_PREFIX + Distance.STANDARD_UNIT
- # Getting the square units values and the alias dictionary.
- UNITS = dict([('%s%s' % (AREA_PREFIX, k), v ** 2) for k, v in Distance.UNITS.items()])
- ALIAS = dict([(k, '%s%s' % (AREA_PREFIX, v)) for k, v in Distance.ALIAS.items()])
- LALIAS = dict([(k.lower(), v) for k, v in ALIAS.items()])
-
- def __truediv__(self, other):
- if isinstance(other, NUMERIC_TYPES):
- return self.__class__(default_unit=self._default_unit,
- **{self.STANDARD_UNIT: (self.standard / other)})
- else:
- raise TypeError('%(class)s must be divided by a number' % {"class":pretty_name(self)})
-
- def __div__(self, other): # Python 2 compatibility
- return type(self).__truediv__(self, other)
-
-
-# Shortcuts
-D = Distance
-A = Area
generated by cgit (git 2.34.1) at 2025-03-12 19:31:06 +0000