Created
October 23, 2015 13:10
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Get distance between 2 lat + lng coordinates with coffee
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| class @geoLocation | |
| constructor: -> | |
| getLocation() | |
| getLocation = -> | |
| if navigator.geolocation | |
| navigator.geolocation.getCurrentPosition showLocation | |
| else | |
| console.warn 'Geolocation is not supported by this browser.' | |
| return | |
| showLocation = (position) -> | |
| lat = position.coords.latitude | |
| lng = position.coords.longitude | |
| $('.locations-col .location').each (index, item) -> | |
| if $(item).find('.distance').length | |
| location_lat = $(item).data('lat') | |
| location_lng = $(item).data('lng') | |
| distance = calcCrow lat, lng, location_lat, location_lng | |
| if distance | |
| console.log Math.round distance | |
| calcCrow = (lat1, lon1, lat2, lon2) -> | |
| R = 6371 | |
| # km | |
| dLat = toRad(lat2 - lat1) | |
| dLon = toRad(lon2 - lon1) | |
| lat1 = toRad(lat1) | |
| lat2 = toRad(lat2) | |
| a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.sin(dLon / 2) * Math.sin(dLon / 2) * Math.cos(lat1) * Math.cos(lat2) | |
| c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)) | |
| d = R * c | |
| d | |
| # Converts numeric degrees to radians | |
| toRad = (Value) -> | |
| Value * Math.PI / 180 | |
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