Adding a little parallax to the U.S. TopoJSON example to illustrate the different layers.
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September 12, 2018 10:49
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TopoJSON Parallax
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
svg { | |
position: absolute; | |
top: 0; | |
left: 0; | |
} | |
path { | |
stroke-linejoin: round; | |
} | |
.land-glow { | |
fill: #000; | |
fill-opacity: .2; | |
filter: url(#glow); | |
} | |
.land-fill { | |
fill: #fff; | |
} | |
.state-boundary { | |
fill: none; | |
stroke: #777; | |
stroke-width: .70px; | |
} | |
.county-boundary { | |
fill: none; | |
} | |
.land-fill, | |
.county-boundary { | |
stroke: #777; | |
stroke-width: .35px; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script src="//d3js.org/topojson.v1.min.js"></script> | |
<script> | |
var width = 960, | |
height = 600; | |
var projection = d3.geo.albersUsa() | |
.scale(1285) | |
.translate([width / 2, height / 2]); | |
var path = d3.geo.path() | |
.projection(projection); | |
d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
if (error) throw error; | |
var svgGlow = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
svgGlow.append("defs").append("path") | |
.datum(topojson.feature(us, us.objects.land)) | |
.attr("id", "land") | |
.attr("d", path); | |
svgGlow.append("filter") | |
.attr("id", "glow") | |
.append("feGaussianBlur") | |
.attr("stdDeviation", 5); | |
svgGlow.append("use") | |
.attr("class", "land-glow") | |
.attr("xlink:href", "#land"); | |
var svgLand = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
svgLand.append("use") | |
.attr("class", "land-fill") | |
.attr("xlink:href", "#land"); | |
var svgCounty = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
svgCounty.append("path") | |
.datum(topojson.mesh(us, us.objects.counties, function(a, b) { | |
return a !== b // a border between two counties | |
&& (a.id === 53000 || b.id === 5300 // where a and b are in puget sound | |
|| a.id % 1000 && b.id % 1000) // or a and b are not in a lake | |
&& !(a.id / 1000 ^ b.id / 1000); // and a and b are in the same state | |
})) | |
.attr("d", path) | |
.attr("class", "county-boundary"); | |
var svgState = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
svgState.append("path") | |
.datum(topojson.mesh(us, us.objects.states, function(a, b) { | |
return a !== b; // a border between two states | |
})) | |
.attr("d", path) | |
.attr("class", "state-boundary"); | |
d3.selectAll("svg") | |
.style(vendor + "transform-style", "preserve-3d"); | |
d3.select(window).on("mousemove", function() { | |
var x = d3.event.clientX - width / 2, | |
y = d3.event.clientY - height / 2; | |
svgGlow.style(vendor + "transform", "translateX(" + x * .02 + "px)translateY(" + y * .01 + "px)"); | |
svgLand.style(vendor + "transform", "translateX(" + x * .04 + "px)translateY(" + y * .02 + "px)"); | |
svgCounty.style(vendor + "transform", "translateX(" + x * .08 + "px)translateY(" + y * .04 + "px)"); | |
svgState.style(vendor + "transform", "translateX(" + x * .16 + "px)translateY(" + y * .08 + "px)"); | |
}); | |
}); | |
d3.select(self.frameElement).style("height", height + "px"); | |
var vendor = (function(p) { | |
var i = -1, n = p.length, s = document.body.style; | |
while (++i < n) if (p[i] + "Transform" in s) return "-" + p[i].toLowerCase() + "-"; | |
return ""; | |
})(["webkit", "ms", "Moz", "O"]); | |
</script> |
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