143 lines
4.6 KiB
Python
143 lines
4.6 KiB
Python
from os import path
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from ConfigParser import ConfigParser
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import fractions
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import pyexiv2
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import math
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import requests
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import sys
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import urllib
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from elodie import constants
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class Fraction(fractions.Fraction):
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"""Only create Fractions from floats.
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>>> Fraction(0.3)
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Fraction(3, 10)
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>>> Fraction(1.1)
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Fraction(11, 10)
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"""
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def __new__(cls, value, ignore=None):
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"""Should be compatible with Python 2.6, though untested."""
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return fractions.Fraction.from_float(value).limit_denominator(99999)
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def coordinates_by_name(name):
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geolocation_info = lookup(name)
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if(geolocation_info is not None):
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if('results' in geolocation_info and len(geolocation_info['results']) != 0 and
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'locations' in geolocation_info['results'][0] and len(geolocation_info['results'][0]['locations']) != 0):
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# By default we use the first entry unless we find one with geocodeQuality=city.
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use_location = geolocation_info['results'][0]['locations'][0]['latLng']
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# Loop over the locations to see if we come accross a geocodeQuality=city.
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# If we find a city we set that to the use_location and break
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for location in geolocation_info['results'][0]['locations']:
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if('latLng' in location and 'lat' in location['latLng'] and 'lng' in location['latLng'] and location['geocodeQuality'].lower() == 'city'):
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use_location = location['latLng']
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break
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return {
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'latitude': use_location['lat'],
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'longitude': use_location['lng']
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}
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return None
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def decimal_to_dms(decimal):
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"""Convert decimal degrees into degrees, minutes, seconds.
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>>> decimal_to_dms(50.445891)
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[Fraction(50, 1), Fraction(26, 1), Fraction(113019, 2500)]
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>>> decimal_to_dms(-125.976893)
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[Fraction(125, 1), Fraction(58, 1), Fraction(92037, 2500)]
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"""
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remainder, degrees = math.modf(abs(decimal))
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remainder, minutes = math.modf(remainder * 60)
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# @TODO figure out a better and more proper way to do seconds
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return (pyexiv2.Rational(degrees, 1), pyexiv2.Rational(minutes, 1), pyexiv2.Rational(int(remainder*1000000000), 1000000000))
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def dms_to_decimal(degrees, minutes, seconds, sign=' '):
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"""Convert degrees, minutes, seconds into decimal degrees.
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>>> dms_to_decimal(10, 10, 10)
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10.169444444444444
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>>> dms_to_decimal(8, 9, 10, 'S')
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-8.152777777777779
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"""
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return (-1 if sign[0] in 'SWsw' else 1) * (
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float(degrees) +
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float(minutes) / 60 +
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float(seconds) / 3600
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)
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def get_key():
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config_file = '%s/config.ini' % constants.application_directory
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if not path.exists(config_file):
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return None
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config = ConfigParser()
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config.read(config_file)
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if('MapQuest' not in config.sections()):
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return None
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return config.get('MapQuest', 'key')
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def place_name(lat, lon):
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geolocation_info = reverse_lookup(lat, lon)
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if(geolocation_info is not None):
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if('address' in geolocation_info):
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address = geolocation_info['address']
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if('city' in address):
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return address['city']
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elif('state' in address):
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return address['state']
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elif('country' in address):
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return address['country']
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return None
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def reverse_lookup(lat, lon):
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if(lat is None or lon is None):
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return None
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key = get_key()
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try:
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params = {'format': 'json', 'key': key, 'lat': lat, 'lon': lon}
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r = requests.get('http://open.mapquestapi.com/nominatim/v1/reverse.php?%s' % urllib.urlencode(params))
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return r.json()
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except requests.exceptions.RequestException as e:
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if(constants.debug == True):
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print e
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return None
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except ValueError as e:
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if(constants.debug == True):
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print r.text
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print e
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return None
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def lookup(name):
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if(name is None or len(name) == 0):
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return None
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key = get_key()
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try:
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params = {'format': 'json', 'key': key, 'location': name}
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if(constants.debug == True):
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print 'http://open.mapquestapi.com/geocoding/v1/address?%s' % urllib.urlencode(params)
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r = requests.get('http://open.mapquestapi.com/geocoding/v1/address?%s' % urllib.urlencode(params))
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return r.json()
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except requests.exceptions.RequestException as e:
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if(constants.debug == True):
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print e
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return None
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except ValueError as e:
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if(constants.debug == True):
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print r.text
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print e
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return None
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