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equidistant.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Moscow rings in equidistant projection</title>
<style>
body {
background: #fcfcfa;
}
html, body {
margin: 0;
width: 100%;
height: 100%;
}
.stroke {
fill: none;
stroke: #000;
stroke-width: 3px;
}
.fill {
fill: #fff;
}
.graticule {
fill: none;
stroke: #777;
stroke-width: .5px;
stroke-opacity: .5;
}
.land {
fill: #ddd;
stroke: #888;
}
.ring {
stroke: #ff0000;
stroke-width: 1px;
stroke-opacity: .5;
fill-opacity: 0;
z-index: 50;
}
.boundary {
fill: none;
stroke: #fff;
stroke-width: .5px;
}
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script>
<script src="https://cdn.rawgit.com/bjornharrtell/jsts/gh-pages/lib/0.16.0/javascript.util.min.js"></script>
<script src="https://cdn.rawgit.com/bjornharrtell/jsts/gh-pages/lib/0.16.0/jsts.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.3.12/proj4.js"></script>
</head>
<body>
<script>
var w = window,
d = document,
e = d.documentElement,
g = d.getElementsByTagName('body')[0],
width = w.innerWidth || e.clientWidth || g.clientWidth,
height = w.innerHeight|| e.clientHeight|| g.clientHeight;
var m = [55.751849391735284, 37.61993408203125].reverse();
var scale = 150;
var projection = d3.geo.azimuthalEquidistant()
.scale(6378137/*500 * scale*/)
.rotate(m.map(function(c) { return -c; })/*[74.0064, -40.7142]*/)
.clipAngle(180)
.translate([width / 2, height / 2])
.precision(.1);
var circle = d3.geo.circle()
.origin(m/*[-74.0064, 40.7142]*/);
var path = d3.geo.path()
.projection(projection);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
svg.append("defs").append("path")
.datum({type: "Sphere"})
.attr("id", "sphere")
.attr("d", path);
svg.append("use")
.attr("class", "stroke")
.attr("xlink:href", "#sphere");
svg.append("use")
.attr("class", "fill")
.attr("xlink:href", "#sphere");
svg.append("g")
.attr("class", "graticule")
.selectAll("path")
.data(d3.range(0.05, 2, 0.05).map(function(d) { return circle.angle(d)(); }))
.enter().append("path")
.attr("d", path);
var projected;
svg.on('click', function(e) {
console.log(projection.invert([d3.event.x, d3.event.y]));
});
d3.json("data/world_simplified.json", function(error, world) {
var json = world;
if (error) throw error;
svg.insert("path", ".graticule")
.datum(json)
.attr("class", "land")
.attr("d", path);
var projected;
d3.json("data/data.json", function(error, rings) {
if (error) throw error;
svg.insert("path", ".graticule")
.datum(rings)
.attr('class', 'ring')
.attr("d", path);
});
});
</script>
</body>
</html>