forked from mpmckenna8's block: Flatten sphere w/ d3 and svg path transitions!
forked from earthjs's block: Flatten sphere w/ d3 and svg path transitions!
license: mit |
forked from mpmckenna8's block: Flatten sphere w/ d3 and svg path transitions!
forked from earthjs's block: Flatten sphere w/ d3 and svg path transitions!
<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
path { | |
fill: none; | |
stroke-linejoin: round; | |
} | |
.graticule { | |
stroke: #aaa; | |
} | |
.equator { | |
stroke: red; | |
stroke-width: 2px; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.js"></script> | |
<script src="http://d3js.org/d3.geo.projection.v0.min.js" type="text/javascript"></script> | |
<script src="http://d3js.org/topojson.v1.js"></script> | |
<script> | |
var width = 1060, | |
height = 600; | |
var g1 = d3.geo.orthographic() | |
.rotate([10, -10]) | |
.center([-10, 10]) | |
.scale(240) | |
.translate([width / 2, height / 2]); | |
var g2 = d3.geo.equirectangular() | |
.scale(153) | |
.translate([width / 2, height / 2]); | |
var proj = interpolatedProjection(g1, g2); | |
var patx = d3.geo.path().projection(proj); | |
var graticule = d3.geo.graticule(); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
var feature = svg.selectAll("path"); | |
d3.json('brazilWor.json',function(world){ | |
var feat = topojson.feature(world,world.objects.countries110).features; | |
svg.selectAll('.coun').data(feat).enter().append('path') | |
.attr('d',patx) | |
.attr('class','coun') | |
.style('fill','blue'); | |
svg.append("path") | |
.datum(graticule) | |
.attr("class", "graticule") | |
.attr("d", patx); | |
var cord = [[-180, 0], [-90, 0], [0, 0], [90, 0], [180, 0]]; | |
svg.append("path").datum({type: "LineString", coordinates: cord}) | |
.attr("class", "equator") | |
.attr("d", patx); | |
feature = svg.selectAll("path"); | |
animation(); | |
}) | |
function animation() { | |
svg.transition() | |
.duration(10500) | |
.tween("projection", function() { | |
return function(_) { | |
animation.alpha(_); | |
feature.attr("d", patx); | |
}; | |
}); | |
} | |
function interpolatedProjection(a, b) { | |
var px = d3.geo.projection(raw).scale(1), α; | |
function raw(λ, φ) { | |
var pa = a([λ *= 180 / Math.PI, φ *= 180 / Math.PI]), pb = b([λ, φ]); | |
return [(1 - α) * pa[0] + α * pb[0], (α - 1) * pa[1] - α * pb[1]]; | |
} | |
animation.alpha = function(_x) { | |
if (!arguments.length) return α; | |
α = +_x; | |
var ca = a.center(), cb = b.center(), | |
ta = a.translate(), tb = b.translate(); | |
console.log(α, ca, cb); | |
px.center([(1 - α) * ca[0] + α * cb[0], (1 - α) * ca[1] + α * cb[1]]); | |
px.translate([(1 - α) * ta[0] + α * tb[0], (1 - α) * ta[1] + α * tb[1]]); | |
return px; | |
}; | |
animation.alpha(0); | |
return px; | |
} | |
</script> |