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<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
<script src="http://d3js.org/topojson.v1.min.js"></script> | |
<script src="https://rawgit.com/Delapouite/JsClipper/master/clipper.js"></script> | |
<style> | |
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
svg { width:100%; height: 100% } | |
.land { | |
fill: none; | |
stroke: #000000; | |
} | |
.stroke { | |
fill: none; | |
stroke: #ff0000; | |
} | |
.spiral { | |
fill: #ffffff; | |
stroke: #CC0A48; | |
fill-opacity: 0.2 | |
} | |
</style> | |
</head> | |
<body> | |
<svg></svg> | |
<script> | |
var pointsFromPath = function(path){ | |
var points = [] | |
for(var x = 0; x < path.getTotalLength(); x++){ | |
points.push(path.getPointAtLength(x)); | |
} | |
return points; | |
} | |
var roundTo = function (input, sigdigs) { | |
return Math.round(input * Math.pow(10, sigdigs) ) / Math.pow(10, sigdigs); | |
} | |
var makeSpiralPoints = function(origin, revolutions, pointCount, clockwise, padding){ | |
var direction = clockwise ? 1 : -1; | |
var circ = padding / (2 * Math.PI); | |
var step = (2 * Math.PI * revolutions) / pointCount; | |
var points = [], angle, x, y; | |
for (var i = 0; i <= pointCount ; i++){ | |
angle = direction * step * i; | |
x = roundTo((circ * angle) * Math.cos(angle) + origin.x, 2); | |
y = roundTo((circ * angle) * Math.sin(angle) + origin.y, 2); | |
points.push(x + " " + y); | |
} | |
return('M ' + points.shift() + ' S ' + points.join(' ')); | |
} | |
var render = function(world){ | |
var svg = d3.select("svg"); | |
var width = 500; | |
var height = 500; | |
var center = { | |
x: width/2, | |
y: height/2 | |
} | |
var countries = topojson.feature(world, world.objects.land); | |
var projection = d3.geo.orthographic() | |
.scale(200) | |
.rotate([9,0,0]) | |
.translate([width/2, height/2]) | |
.clipAngle(90); | |
var path = d3.geo.path() | |
.projection(projection); | |
svg.append("path") | |
.attr("d", path(countries)) | |
.classed("land", true); | |
var bbox = svg.select('.land')[0][0].getBBox(); | |
var spiral = svg.append("path") | |
.attr("d", makeSpiralPoints({ | |
x:center.x, | |
y:center.y | |
},bbox.height/8, 4000, false, 4)) | |
.classed("spiral", true); | |
// extract points | |
var spiralPoints = pointsFromPath(spiral.node()); | |
var geoPoints = pointsFromPath(spiral.node()); | |
console.log(spiralPoints); | |
} | |
d3.json("https://rawgit.com/mbostock/topojson/master/examples/world-110m.json", | |
function(error, json) { | |
if (error){ | |
return console.warn(error); | |
} | |
render(json); | |
}); | |
</script> | |
</body> |
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