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December 18, 2015 22:38
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Nearest Citibike
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<!DOCTYPE HTML> | |
<style> | |
body {font-family: Verdana, Geneva, sans-serif;font-size:14px;} | |
th {font-weight:bold;text-align:left;} | |
td,th {padding-left:5px;} | |
</style> | |
<body> | |
<script> | |
var data,pos,limit=10; | |
var notice = document.createElement("div"); | |
notice.innerHTML = "Please Click 'Allow' for Geolocation"; | |
document.body.appendChild(notice); | |
function distance(start,end) { | |
var dLat = Math.abs(end.lat - start.lat) * Math.PI/180; | |
var dlng = Math.abs(end.lng - start.lng) * Math.PI/180; | |
var lat1 = end.lat * Math.PI/180; | |
var lng1 = end.lng * Math.PI/180; | |
var lat2 = start.lat * Math.PI/180; | |
var lng2 = start.lng * Math.PI/180; | |
var d1 = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.sin(dlng/2) * Math.sin(dlng/2) * Math.cos(lat1) * Math.cos(lat2); | |
return (2 * Math.atan2(Math.sqrt(d1), Math.sqrt(1-d1))) * 6371; | |
} | |
if (navigator.geolocation) { | |
navigator.geolocation.getCurrentPosition(yeslocation,nolocation); | |
} else nolocation(); | |
function yeslocation(d) { | |
pos = {lat:d.coords.latitude,lng:d.coords.longitude}; | |
render(); | |
} | |
function nolocation() { | |
limit = Infinity; | |
pos = {lat:40.751492,lng:-73.977988}; | |
notice.innerHTML = "Location not found, using GCT"; | |
render(); | |
} | |
function cb(d) { data = d; render();} | |
function render() { | |
if (!data || !pos) return; | |
if (limit !== Infinity) notice.innerHTML=""; | |
var table = document.createElement('table'); | |
var header = document.createElement("TR"); | |
table.appendChild(header); | |
header.innerHTML = "<th>Dist</th><th>B</th><th>S</th><th>Location</th>"; | |
document.body.appendChild(table); | |
data.map(function(d) { | |
d.lat = d.lat /1000000; | |
d.lng = d.lng /1000000; | |
d.distance = distance(pos,d); | |
return d; | |
}) | |
.sort(function(a,b) { return a.distance -b.distance;}) | |
.slice(0,limit) | |
.forEach(function(d) { | |
var div = document.createElement('tr'); | |
div.innerHTML = "<td>"+[Math.round(d.distance*100)/100,d.bikes,d.free,d.name].join("</td><td>")+"</td>"; | |
table.appendChild(div); | |
}); | |
} | |
</script> | |
<script src="http://api.citybik.es/citibikenyc.json?callback=cb"></script> | |
</body> |
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