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@mbostock

mbostock/.block

Forked from anonymous/README.md
Last active Feb 9, 2016
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No Antimeridian Cutting
license: gpl-3.0
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var width = 960,
height = 500;
var rotation = d3.geo.rotation([0, 0]);
var λ = d3.scale.linear()
.domain([100, width - 100])
.range([-180, 180]);
var φ = d3.scale.linear()
.domain([100, height - 100])
.range([90, -90]);
var canvas = d3.select("body").append("canvas")
.attr("width", width)
.attr("height", height);
var context = canvas.node().getContext("2d");
var path = d3.geo.path()
.projection(conicEqualArea(150, [width * .5, height * .69]))
.context(context);
d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) {
if (error) throw error;
var land = topojson.feature(world, world.objects.land),
sphere = {type: "Sphere"},
touch = "ontouchstart" in window;
canvas.on(touch ? "touchmove" : "mousemove", move);
draw();
function move() {
var p = touch ? d3.touches(this)[0] : d3.mouse(this);
rotation = d3.geo.rotation([λ(p[0]), φ(p[1])]);
draw();
d3.event.preventDefault();
}
function draw() {
context.clearRect(0, 0, width, height);
context.beginPath();
path(land);
context.fill();
}
});
function conicEqualArea(scale, translate) {
var projection = d3.geo.conicEqualArea.raw(0, Math.PI / 3);
return {
stream: function(output) {
return {
point: function(x, y) {
xy = rotation([x, y]);
xy = [xy[0] * Math.PI / 180, xy[1] * Math.PI / 180];
xy = projection(xy[0], xy[1]);
output.point(xy[0] * scale + translate[0], translate[1] - xy[1] * scale);
},
sphere: function() { output.sphere(); },
lineStart: function() { output.lineStart(); },
lineEnd: function() { output.lineEnd(); },
polygonStart: function() { output.polygonStart(); },
polygonEnd: function() { output.polygonEnd(); }
};
}
};
}
</script>
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