123 lines
2.8 KiB
Python
123 lines
2.8 KiB
Python
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from geopy import units
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# Unicode characters for symbols that appear in coordinate strings.
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DEGREE = chr(176)
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PRIME = chr(8242)
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DOUBLE_PRIME = chr(8243)
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ASCII_DEGREE = ''
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ASCII_PRIME = "'"
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ASCII_DOUBLE_PRIME = '"'
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LATIN1_DEGREE = chr(176)
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HTML_DEGREE = '°'
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HTML_PRIME = '′'
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HTML_DOUBLE_PRIME = '″'
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XML_DECIMAL_DEGREE = '°'
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XML_DECIMAL_PRIME = '′'
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XML_DECIMAL_DOUBLE_PRIME = '″'
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XML_HEX_DEGREE = '&xB0;'
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XML_HEX_PRIME = '&x2032;'
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XML_HEX_DOUBLE_PRIME = '&x2033;'
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ABBR_DEGREE = 'deg'
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ABBR_ARCMIN = 'arcmin'
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ABBR_ARCSEC = 'arcsec'
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DEGREES_FORMAT = (
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"%(degrees)d%(deg)s %(minutes)d%(arcmin)s %(seconds)g%(arcsec)s"
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)
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UNICODE_SYMBOLS = {
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'deg': DEGREE,
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'arcmin': PRIME,
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'arcsec': DOUBLE_PRIME
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}
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ASCII_SYMBOLS = {
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'deg': ASCII_DEGREE,
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'arcmin': ASCII_PRIME,
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'arcsec': ASCII_DOUBLE_PRIME
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}
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LATIN1_SYMBOLS = {
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'deg': LATIN1_DEGREE,
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'arcmin': ASCII_PRIME,
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'arcsec': ASCII_DOUBLE_PRIME
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}
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HTML_SYMBOLS = {
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'deg': HTML_DEGREE,
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'arcmin': HTML_PRIME,
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'arcsec': HTML_DOUBLE_PRIME
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}
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XML_SYMBOLS = {
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'deg': XML_DECIMAL_DEGREE,
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'arcmin': XML_DECIMAL_PRIME,
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'arcsec': XML_DECIMAL_DOUBLE_PRIME
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}
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ABBR_SYMBOLS = {
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'deg': ABBR_DEGREE,
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'arcmin': ABBR_ARCMIN,
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'arcsec': ABBR_ARCSEC
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}
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def format_degrees(degrees, fmt=DEGREES_FORMAT, symbols=None):
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"""
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TODO docs.
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"""
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symbols = symbols or ASCII_SYMBOLS
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arcminutes = units.arcminutes(degrees=degrees - int(degrees))
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arcseconds = units.arcseconds(arcminutes=arcminutes - int(arcminutes))
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format_dict = dict(
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symbols,
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degrees=degrees,
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minutes=abs(arcminutes),
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seconds=abs(arcseconds)
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)
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return fmt % format_dict
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DISTANCE_FORMAT = "%(magnitude)s%(unit)s"
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DISTANCE_UNITS = {
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'km': lambda d: d,
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'm': lambda d: units.meters(kilometers=d),
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'mi': lambda d: units.miles(kilometers=d),
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'ft': lambda d: units.feet(kilometers=d),
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'nm': lambda d: units.nautical(kilometers=d),
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'nmi': lambda d: units.nautical(kilometers=d)
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}
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def format_distance(kilometers, fmt=DISTANCE_FORMAT, unit='km'):
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"""
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TODO docs.
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"""
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magnitude = DISTANCE_UNITS[unit](kilometers)
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return fmt % {'magnitude': magnitude, 'unit': unit}
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_DIRECTIONS = [
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('north', 'N'),
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('north by east', 'NbE'),
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('north-northeast', 'NNE'),
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('northeast by north', 'NEbN'),
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('northeast', 'NE'),
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('northeast by east', 'NEbE'),
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('east-northeast', 'ENE'),
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('east by north', 'EbN'),
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('east', 'E'),
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('east by south', 'EbS'),
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('east-southeast', 'ESE'),
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('southeast by east', 'SEbE'),
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('southeast', 'SE'),
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('southeast by south', 'SEbS'),
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]
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DIRECTIONS, DIRECTIONS_ABBR = zip(*_DIRECTIONS)
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ANGLE_DIRECTIONS = {
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n * 11.25: d
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for n, d
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in enumerate(DIRECTIONS)
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}
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ANGLE_DIRECTIONS_ABBR = {
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n * 11.25: d
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for n, d
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in enumerate(DIRECTIONS_ABBR)
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}
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