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Location API
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8"> | |
<meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
<meta name="viewport" content="width=device-width, initial-scale=1"> | |
<title>Location API</title> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
</head> | |
<body> | |
<style> | |
body { | |
margin: 0; | |
} | |
svg { | |
background-color: #333; | |
cursor: pointer; | |
} | |
.land { | |
fill: #00D9FF; | |
fill-opacity: 0.35; | |
stroke: #00D9FF; | |
stroke-width: 1; | |
} | |
.location { | |
fill: none; | |
stroke: #FFFB00; | |
stroke-width: 2; | |
} | |
.coords { | |
fill: none; | |
stroke: #FFFB00; | |
font-family: 'Helvetica Neue', Helvetica, sans-serif; | |
font-weight: 300; | |
font-size: 16px; | |
} | |
</style> | |
<div id="map-container"></div> | |
<script> | |
// Set the dimensions of the map | |
var width = 960, | |
height = 480; | |
// Create a selection for the container div and append the svg element | |
var div = d3.select('#map-container'), | |
svg = div.append('svg'); | |
// Set the size of the SVG element | |
svg.attr('width', width).attr('height', height); | |
// Create and configure a geographic projection | |
var projection = d3.geo.equirectangular() | |
.translate([width / 2, height / 2]); | |
// Create and configure a path generator | |
var pathGenerator = d3.geo.path() | |
.projection(projection); | |
// Retrieve the geographic data asynchronously | |
d3.json('land.geojson', function(err, data) { | |
// Throw errors on getting or parsing the file | |
if (err) { throw err; } | |
// Land | |
var land = svg.selectAll('path.land').data([data]); | |
land.enter().append('path').classed('land', true); | |
land.attr('d', pathGenerator); | |
land.exit().remove(); | |
}); | |
// Location API Options | |
var locationOptions = { | |
enableHighAccuracy: false, // No need for high accuracy | |
timeout: 2e3, // Wait at most 2 seconds | |
maximumAge: 60 * 60 * 1e3 // one hour | |
}; | |
// Location API | |
svg.on('click', function() { | |
navigator.geolocation.getCurrentPosition(showLocation, fallback, locationOptions); | |
}); | |
// It will be invoked when the user allows the application to use the Location API | |
function showLocation(position) { | |
// Extract the longiture and latitude from the position object | |
var coords = [ | |
position.coords.longitude, | |
position.coords.latitude | |
]; | |
// Circle showing the location | |
var circle = svg.selectAll('circle.location').data([coords]); | |
circle.enter().append('circle') | |
.classed('location', true) | |
.attr('r', d3.max([width, height])) | |
.attr('cx', function(d) { return projection(d)[0]; }) | |
.attr('cy', function(d) { return projection(d)[1]; }); | |
circle.transition().duration(2e3) | |
.attr('r', 3); | |
circle.exit().remove(); | |
// Label with the coordinates | |
var label = svg.selectAll('text.coords').data([coords]); | |
label.enter().append('text') | |
.classed('coords', true) | |
.attr('x', function(d) { return 10 + projection(d)[0]; }) | |
.attr('y', function(d) { return 5 + projection(d)[1]; }); | |
label.transition().delay(2e3) | |
.text(function(d) { | |
var lon = d[0].toFixed(4), | |
lat = d[1].toFixed(4); | |
return lat + ', ' + lon; | |
}); | |
label.exit().remove(); | |
} | |
function fallback() { | |
console.log('Unable to get the location'); | |
} | |
</script> | |
</body> | |
</html> |
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