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ward_map.html
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ward_map.html
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<!DOCTYPE html>
<head>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.5/leaflet.css" />
<script src="http://cdn.leafletjs.com/leaflet-0.5/leaflet.js"></script>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script src="http://d3js.org/queue.v1.min.js"></script>
<style>
.legend {
padding: 0px 0px;
font: 10px sans-serif;
background: white;
background: rgba(255,255,255,0.8);
box-shadow: 0 0 15px rgba(0,0,0,0.2);
border-radius: 5px;
}
.key path {
display: none;
}
</style>
</head>
<body>
<div id="map" style="width: 960px; height: 500px"></div>
<script>
queue()
.defer(d3.json, 'data/data.json')
.defer(d3.json, 'data/wards.geojson')
.await(makeMap)
function makeMap(error, data_1,gjson_1) {
function matchKey(datapoint, key_variable){
return(parseFloat(key_variable[0][datapoint]));
};
var color = d3.scale.threshold()
.domain([0.082715907469937747, 0.19630946375513353, 0.54354553836381736, 1.2741887593292438, 5.1079713241686795, 15.39304728160239])
.range(['#EDF8FB', '#BFD3E6', '#9EBCDA', '#8C96C6', '#8C6BB1', '#88419D', '#6E016B']);
var map = L.map('map').setView([51.5, 0.0], 10);
L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
maxZoom: 18,
attribution: 'Map data (c) <a href="http://openstreetmap.org">OpenStreetMap</a> contributors'
}).addTo(map);
function style_1(feature) {
return {
fillColor: color(matchKey(feature.properties.NAME, data_1)),
weight: 1,
opacity: 0.2,
color: 'black',
fillOpacity: 0.75
};
}
gJson_layer_1 = L.geoJson(gjson_1, {style: style_1}).addTo(map)
var legend = L.control({position: 'topright'});
legend.onAdd = function (map) {var div = L.DomUtil.create('div', 'legend'); return div};
legend.addTo(map);
var x = d3.scale.linear()
.domain([0, 16])
.range([0, 400]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("top")
.tickSize(1)
.tickValues(color.domain())
var svg = d3.select(".legend.leaflet-control").append("svg")
.attr("id", 'legend')
.attr("width", 450)
.attr("height", 40);
var g = svg.append("g")
.attr("class", "key")
.attr("transform", "translate(25,16)");
g.selectAll("rect")
.data(color.range().map(function(d, i) {
return {
x0: i ? x(color.domain()[i - 1]) : x.range()[0],
x1: i < color.domain().length ? x(color.domain()[i]) : x.range()[1],
z: d
};
}))
.enter().append("rect")
.attr("height", 10)
.attr("x", function(d) { return d.x0; })
.attr("width", function(d) { return d.x1 - d.x0; })
.style("fill", function(d) { return d.z; });
g.call(xAxis).append("text")
.attr("class", "caption")
.attr("y", 21)
.text('Density (km2)');
};
</script>
</body>