# Coverage for pygeodesy/utily.py : 97%

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After I{(C) Chris Veness 2011-2015} published under the same MIT Licence**, see U{Latitude/Longitude<https://www.Movable-Type.co.UK/scripts/latlong.html>} and U{Vector-based geodesy<https://www.Movable-Type.co.UK/scripts/latlong-vectors.html>}. @newfield example: Example, Examples ''' from pygeodesy.basics import EPS, R_M , _float, InvalidError, \ _Ints, _n_v_Error3 # PYCHOK PI_4 from pygeodesy.lazily import _ALL_LAZY from math import cos, degrees, pi as PI, radians, sin, tan # pow # all public contants, classes and functions __all__ = _ALL_LAZY.utily __version__ = '20.04.12' PI2 = PI * 2.0 #: Two PI, M{PI * 2} aka Tau (C{float}) # PYCHOK expected PI_2 = PI / 2.0 #: Half PI, M{PI / 2} (C{float}) PI_4 = PI / 4.0 #: Quarter PI, M{PI / 4} (C{float}) # <https://Numbers.Computation.Free.FR/Constants/Miscellaneous/digits.html> _1_90 = 1.0 / 90 # 0.011111111111111111111111111111111111111111111111 _2_PI = 2.0 / PI # 0.63661977236758134307553505349005744813783858296182 _iterNumpy2len = 1 # adjustable for testing purposes _MISSING = object() # singleton, imported by .wgrs def degrees90(rad): '''Convert radians to degrees and wrap M{[-270..+90]}. @arg rad: Angle (C{radians}). @return: Angle in degrees, wrapped (C{degrees90}). ''' return _wrap(degrees(rad), 90, 360) def degrees180(rad): '''Convert radians to degrees and wrap M{[-180..+180]}. @arg rad: Angle (C{radians}). @return: Angle in degrees, wrapped (C{degrees180}). ''' return _wrap(degrees(rad), 180, 360) def degrees360(rad): '''Convert radians to degrees and wrap M{[0..+360)}. @arg rad: Angle (C{radians}). @return: Angle in degrees, wrapped (C{degrees360}). ''' return _wrap(degrees(rad), 360, 360) def degrees2m(deg, radius=R_M, lat=0): '''Convert angle to distance along the equator or along a parallel at an other latitude. @arg deg: Angle (C{degrees}). @kwarg radius: Mean earth radius (C{meter}). @kwarg lat: Parallel latitude (C{degrees90}). @return: Distance (C{meter}, same units as B{C{radius}}). @raise RangeError: Latitude B{C{lat}} outside valid range and L{rangerrors} set to C{True}. @raise ValueError: Invalid B{C{deg}}, B{C{radius}} or B{C{lat}}. ''' m = radians(_float(deg=deg)) * _float(radius=radius) if lat: from pygeodesy.dms import clipDMS m *= cos(radians(clipDMS(_float(lat=lat), 90))) return m def falsed2f(falsed=True, **name_value_Error): # name=value [, Error=ValueError] '''Convert a falsed east-/northing to non-negative C{float}. @kwarg falsed: Value includes false origin (C{bool}). @kwarg name_value_Error: One B{C{name=value}} pair and optionally an B{C{Error=...}} keyword argument to override the default B{C{Error=ValueError}}. @return: The value (C{float}). @raise Error: Invalid or negative B{C{name=value}}. ''' n, v, Error = _n_v_Error3(ValueError, **name_value_Error) try: f = float(v) if f < 0 and falsed: raise ValueError except (TypeError, ValueError): raise InvalidError(Error=Error, **{n: v}) return f def ft2m(feet, usurvey=False): '''Convert I{International} or I{US Survey} feet to meter. @arg feet: Value in feet (C{scalar}). @kwarg usurvery: Convert I{US Survey} feet (C{bool}), I{International} feet otherwise. @return: Value in C{meter} (C{float}). @raise ValueError: Invalid B{C{feet}}. ''' f = _float(feet=feet) # US Survey 1200./3937. == 0.3048006096012192 return f * (0.3048006096012192 if usurvey else 0.3048) def isNumpy2(obj): '''Check for an B{C{Numpy2LatLon}} points wrapper. @arg obj: The object (any C{type}). @return: C{True} if B{C{obj}} is an B{C{Numpy2LatLon}} instance, C{False} otherwise. ''' # isinstance(self, (Numpy2LatLon, ...)) return getattr(obj, 'isNumpy2', False) def isPoints2(obj): '''Check for an B{C{LatLon2psxy}} points wrapper. @arg obj: The object (any C{type}). @return: C{True} if B{C{obj}} is an B{C{LatLon2psxy}} instance, C{False} otherwise. ''' # isinstance(self, (LatLon2psxy, ...)) return getattr(obj, 'isPoints2', False) def isTuple2(obj): '''Check for an B{C{Tuple2LatLon}} points wrapper. @arg obj: The object (any). @return: C{True} if B{C{obj}} is an B{C{Tuple2LatLon}} instance, C{False} otherwise. ''' # isinstance(self, (Tuple2LatLon, ...)) return getattr(obj, 'isTuple2', False) def iterNumpy2(obj): '''Iterate over Numpy2 wrappers or other sequences exceeding the threshold. @arg obj: Points array, list, sequence, set, etc. (any). @return: C{True} do, C{False} don't iterate. ''' try: return isNumpy2(obj) or len(obj) > _iterNumpy2len except TypeError: return False def iterNumpy2over(n=None): '''Get or set the L{iterNumpy2} threshold. @kwarg n: Optional, new threshold (C{int}). @return: Previous threshold (C{int}). @raise ValueError: Invalid B{C{n}}. ''' global _iterNumpy2len p = _iterNumpy2len if n is not None: try: i = int(n) if i > 0: _iterNumpy2len = i else: raise ValueError except (TypeError, ValueError): raise InvalidError(n=n) return p def m2degrees(meter, radius=R_M): '''Convert distance to angle along equator. @arg meter: Distance (C{meter}, same units as B{C{radius}}). @kwarg radius: Mean earth radius (C{meter}). @return: Angle (C{degrees}). @raise ValueError: Invalid B{C{meter}} or B{C{radius}}. ''' r = _float(radius=radius) if r < EPS: raise InvalidError(radius=radius) return degrees(_float(meter=meter) / r) def m2ft(meter, usurvey=False): '''Convert meter to I{International} or I{US Survey} feet (C{ft}). @arg meter: Value in meter (C{scalar}). @kwarg usurvery: Convert to I{US Survey} feet (C{bool}), I{International} feet otherwise. @return: Value in C{feet} (C{float}). @raise ValueError: Invalid B{C{meter}}. ''' m = _float(meter=meter) # US Survey == 3937./1200. = 3.2808333333333333 return m * (3.2808333333333333 if usurvey else 3.2808399) def m2km(meter): '''Convert meter to kilo meter (km). @arg meter: Value in meter (C{scalar}). @return: Value in km (C{float}). @raise ValueError: Invalid B{C{meter}}. ''' return _float(meter=meter) * 1.0e-3 def m2NM(meter): '''Convert meter to nautical miles (NM). @arg meter: Value in meter (C{scalar}). @return: Value in NM (C{float}). @raise ValueError: Invalid B{C{meter}}. ''' return _float(meter=meter) * 5.39956804e-4 # == * 1.0 / 1852.0 def m2SM(meter): '''Convert meter to statute miles (SM). @arg meter: Value in meter (C{scalar}). @return: Value in SM (C{float}). @raise ValueError: Invalid B{C{meter}}. ''' return _float(meter=meter) * 6.21369949e-4 # XXX 6.213712e-4 == 1.0 / 1609.344 def radiansPI(deg): '''Convert and wrap degrees to radians M{[-PI..+PI]}. @arg deg: Angle (C{degrees}). @return: Radians, wrapped (C{radiansPI}) ''' return _wrap(radians(deg), PI, PI2) def radiansPI2(deg): '''Convert and wrap degrees to radians M{[0..+2PI)}. @arg deg: Angle (C{degrees}). @return: Radians, wrapped (C{radiansPI2}) ''' return _wrap(radians(deg), PI2, PI2) def radiansPI_2(deg): '''Convert and wrap degrees to radians M{[-3PI/2..+PI/2]}. @arg deg: Angle (C{degrees}). @return: Radians, wrapped (C{radiansPI_2}) ''' return _wrap(radians(deg), PI_2, PI2) def _sincos2(q, r): '''(INTERNAL) 2-tuple (C{sin(r), cos(r)}) in quadrant C{q}. ''' if r: s, c = sin(r), cos(r) t = s, c, -s, -c, s else: # XXX sin(-0.0)? t = 0.0, 1.0, -0.0, -1.0, 0.0 q &= 3 return t[q], t[q + 1] def sincos2(*rad): '''Return the C{sine} and C{cosine} of angle(s). @arg rad: One or more angles (C{radians}). @return: The C{sin(rad)} and C{cos(rad)} for each angle. @see: U{GeographicLib<https://GeographicLib.SourceForge.io/html/ classGeographicLib_1_1Math.html#sincosd>} function U{sincosd <https://SourceForge.net/p/geographiclib/code/ci/release/tree/ python/geographiclib/geomath.py#l155>} and C++ U{sincosd <https://SourceForge.net/p/geographiclib/code/ci/release/tree/ include/GeographicLib/Math.hpp#l558>}. ''' for r in rad: q = int(r * _2_PI) # int(math.floor) if r < 0: q -= 1 s, c = _sincos2(q, r - q * PI_2) # 0 <= r < PI_2 yield s yield c def sincos2d(*deg): '''Return the C{sine} and C{cosine} of angle(s) in C{degrees}. @arg deg: One or more angles (C{degrees}). @return: The C{sin(rad)} and C{cos(rad)} for each angle. @see: U{GeographicLib<https://GeographicLib.SourceForge.io/html/ classGeographicLib_1_1Math.html#sincosd>} function U{sincosd <https://SourceForge.net/p/geographiclib/code/ci/release/tree/ python/geographiclib/geomath.py#l155>} and C++ U{sincosd <https://SourceForge.net/p/geographiclib/code/ci/release/tree/ include/GeographicLib/Math.hpp#l558>}. ''' for d in deg: q = int(d * _1_90) # int(math.floor) if d < 0: q -= 1 s, c = _sincos2(q, radians(d - q * 90)) # 0 <= r < PI_2 yield s yield c def splice(iterable, n=2, **fill): '''Split an iterable into C{n} slices. @arg iterable: Items to be spliced (C{list}, C{tuple}, ...). @kwarg n: Number of slices to generate (C{int}). @kwarg fill: Optional fill value for missing items. @return: A generator for each of B{C{n}} slices, M{iterable[i::n] for i=0..n}. @raise ValueError: Invalid B{C{n}}. @note: Each generated slice is a C{tuple} or a C{list}, the latter only if the B{C{iterable}} is a C{list}. @example: >>> from pygeodesy import splice >>> a, b = splice(range(10)) >>> a, b ((0, 2, 4, 6, 8), (1, 3, 5, 7, 9)) >>> a, b, c = splice(range(10), n=3) >>> a, b, c ((0, 3, 6, 9), (1, 4, 7), (2, 5, 8)) >>> a, b, c = splice(range(10), n=3, fill=-1) >>> a, b, c ((0, 3, 6, 9), (1, 4, 7, -1), (2, 5, 8, -1)) >>> tuple(splice(list(range(9)), n=5)) ([0, 5], [1, 6], [2, 7], [3, 8], [4]) >>> splice(range(9), n=1) <generator object splice at 0x0...> ''' if not (isinstance(n, _Ints) and n > 0): raise InvalidError(n=n) t = iterable if not isinstance(t, (list, tuple)): t = tuple(t) # force tuple, also for PyPy3 if n > 1: fill = fill.get('fill', _MISSING) if fill is not _MISSING: m = len(t) % n if m > 0: # fill with same type t += type(t)((fill,)) * (n - m) for i in range(n): yield t[i::n] # [i:None:n] pychok -Tb ... else: yield t def tan_2(rad): '''Compute the tangent of half angle. @arg rad: Angle (C{radians}). @return: M{tan(rad / 2)} (C{float}). ''' return tan(rad * 0.5) def tanPI_2_2(rad): '''Compute the tangent of half angle, 90 degrees rotated. @arg rad: Angle (C{radians}). @return: M{tan((rad + PI/2) / 2)} (C{float}). ''' return tan((rad + PI_2) * 0.5) def unroll180(lon1, lon2, wrap=True): '''Unroll longitudinal delta and wrap longitude in degrees. @arg lon1: Start longitude (C{degrees}). @arg lon2: End longitude (C{degrees}). @kwarg wrap: Wrap and unroll to the M{(-180..+180]} range (C{bool}). @return: 2-Tuple (B{C{lon2-lon1}}, B{C{lon2}}) unrolled (C{degrees}, C{degrees}). @see: Capability C{LONG_UNROLL} in U{GeographicLib <https://GeographicLib.SourceForge.io/html/python/interface.html#outmask>}. ''' d = lon2 - lon1 if wrap and abs(d) > 180: u = _wrap(d, 180, 360) if u != d: return u, lon1 + u return d, lon2 def unrollPI(rad1, rad2, wrap=True): '''Unroll longitudinal delta and wrap longitude in radians. @arg rad1: Start longitude (C{radians}). @arg rad2: End longitude (C{radians}). @kwarg wrap: Wrap and unroll to the M{(-PI..+PI]} range (C{bool}). @return: 2-Tuple (B{C{rad2 - rad1}}, B{C{rad2}}) unrolled (C{radians}, C{radians}). @see: Capability C{LONG_UNROLL} in U{GeographicLib <https://GeographicLib.SourceForge.io/html/python/interface.html#outmask>}. ''' r = rad2 - rad1 if wrap and abs(r) > PI: u = _wrap(r, PI, PI2) if u != r: return u, rad1 + u return r, rad2 def _wrap(angle, wrap, modulo): '''(INTERNAL) Angle wrapper M{((wrap-modulo)..+wrap]}. @arg angle: Angle (C{degrees} or C{radians}). @arg wrap: Range (C{degrees} or C{radians}). @arg modulo: Upper limit (360 C{degrees} or PI2 C{radians}). @return: The B{C{angle}}, wrapped (C{degrees} or C{radians}). ''' if not wrap > angle >= (wrap - modulo): # math.fmod(-1.5, 3.14) == -1.5, but -1.5 % 3.14 == 1.64 # math.fmod(-1.5, 360) == -1.5, but -1.5 % 360 == 358.5 angle %= modulo if angle > wrap: angle -= modulo return angle def wrap90(deg): '''Wrap degrees to M{[-270..+90]}. @arg deg: Angle (C{degrees}). @return: Degrees, wrapped (C{degrees90}). ''' return _wrap(deg, 90, 360) def wrap180(deg): '''Wrap degrees to M{[-180..+180]}. @arg deg: Angle (C{degrees}). @return: Degrees, wrapped (C{degrees180}). ''' return _wrap(deg, 180, 360) def wrap360(deg): '''Wrap degrees to M{[0..+360)}. @arg deg: Angle (C{degrees}). @return: Degrees, wrapped (C{degrees360}). ''' return _wrap(deg, 360, 360) def wrapPI(rad): '''Wrap radians to M{[-PI..+PI]}. @arg rad: Angle (C{radians}). @return: Radians, wrapped (C{radiansPI}). ''' return _wrap(rad, PI, PI2) def wrapPI2(rad): '''Wrap radians to M{[0..+2PI)}. @arg rad: Angle (C{radians}). @return: Radians, wrapped (C{radiansPI2}). ''' return _wrap(rad, PI2, PI2) def wrapPI_2(rad): '''Wrap radians to M{[-3PI/2..+PI/2]}. @arg rad: Angle (C{radians}). @return: Radians, wrapped (C{radiansPI_2}). ''' return _wrap(rad, PI_2, PI2) # **) MIT License # # Copyright (C) 2016-2020 -- mrJean1 at Gmail -- All Rights Reserved. # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the "Software"), # to deal in the Software without restriction, including without limitation # the rights to use, copy, modify, merge, publish, distribute, sublicense, # and/or sell copies of the Software, and to permit persons to whom the # Software is furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, # ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR # OTHER DEALINGS IN THE SOFTWARE.