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Leaflet+D3 Route Shapes
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset='utf-8'> | |
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"> | |
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.css"> | |
<style> | |
body { padding: 0; margin: 0; } | |
html, body, #map { height: 100%; } | |
</style> | |
</head> | |
<body> | |
<div id="map"></div> | |
<script src="http://jashkenas.github.io/underscore/underscore-min.js"></script> | |
<script src="http://code.jquery.com/jquery-2.1.0.min.js"></script> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.js"></script> | |
<script src="https://rawgit.com/jieter/Leaflet.encoded/master/Polyline.encoded.js"></script> | |
<script type="text/javascript" src="http://maps.stamen.com/js/tile.stamen.js?v1.2.4"></script> | |
<script src='main.js'></script> | |
</body> | |
</html> |
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var strokeWidth = 3; | |
var map = new L.Map("map", {center: [35.78, -78.68], zoom: 13}) | |
var layer = new L.StamenTileLayer("toner-lite"); | |
map.addLayer(layer); | |
var svg = d3.select(map.getPanes().overlayPane).append("svg"), | |
g = svg.append("g").attr("class", "leaflet-zoom-hide"); | |
function projectPoint(point) { | |
return map.latLngToLayerPoint(new L.LatLng(point[0], point[1])); | |
} | |
var line = d3.svg.line() | |
.x(function(d) { return projectPoint(d).x; }) | |
.y(function(d) { return projectPoint(d).y; }); | |
var decoded; | |
var feature; | |
var minLat; | |
var maxLat; | |
var minLng; | |
var maxLng; | |
$.getJSON('http://tlapi.dhaz.in/segments.jsonp?agencies=ncsu&callback=?', function(res) { | |
decoded = _.map(d3.values(res.data), function(d) { | |
return L.PolylineUtil.decode(d); | |
}); | |
var lats = _.reduce(decoded, function(memo, d) { return memo.concat(_.map(d, function(e) { return e[0]; }))}, []); | |
var lngs = _.reduce(decoded, function(memo, d) { return memo.concat(_.map(d, function(e) { return e[1]; }))}, []); | |
minLat = d3.min(lats); | |
maxLat = d3.max(lats); | |
minLng = d3.min(lngs); | |
maxLng = d3.max(lngs); | |
var topLeft = projectPoint([maxLat, minLng]); | |
var bottomRight = projectPoint([minLat, maxLng]); | |
topLeft.x = topLeft.x - strokeWidth; | |
topLeft.y = topLeft.y - strokeWidth; | |
bottomRight.x = bottomRight.x + strokeWidth; | |
bottomRight.y = bottomRight.y + strokeWidth; | |
svg .attr("width", bottomRight.x - topLeft.x) | |
.attr("height", bottomRight.y - topLeft.y) | |
.style("left", topLeft.x + "px") | |
.style("top", topLeft.y + "px"); | |
g.attr("transform", "translate(" + -topLeft.x + "," + -topLeft.y + ")"); | |
feature = g.selectAll('path') | |
.data(decoded) | |
.enter().append('path') | |
.attr('d', line) | |
.style({ | |
fill: 'none', | |
stroke: '#f00', | |
'stroke-width': strokeWidth | |
}); | |
map.on('viewreset', reset); | |
map.on('dragstart', function() { console.log('dragstart'); }); | |
map.on('dragend', function() { console.log('dragend'); }); | |
}); | |
function reset() { | |
var topLeft = projectPoint([maxLat, minLng]); | |
var bottomRight = projectPoint([minLat, maxLng]); | |
topLeft.x = topLeft.x - strokeWidth; | |
topLeft.y = topLeft.y - strokeWidth; | |
bottomRight.x = bottomRight.x + strokeWidth; | |
bottomRight.y = bottomRight.y + strokeWidth; | |
svg .attr("width", bottomRight.x - topLeft.x) | |
.attr("height", bottomRight.y - topLeft.y) | |
.style("left", topLeft.x + "px") | |
.style("top", topLeft.y + "px"); | |
g.attr("transform", "translate(" + -topLeft.x + "," + -topLeft.y + ")"); | |
feature.attr('d', line); | |
} |
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