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August 27, 2015 23:22
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Save dannguyen/36e0f357433dda000dc0 to your computer and use it in GitHub Desktop.
Modified version of bl.ocks.org/mbostock/5735770
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<!-- | |
copied from Mike Bostock: | |
http://bl.ocks.org/mbostock/5735770 | |
http://bost.ocks.org/mike/example/#1 | |
--> | |
<body> | |
<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> | |
var width = 700, | |
height = 400; | |
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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