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@mbostock
Last active Apr 26, 2019
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Concentric Circles Emanating
license: gpl-3.0
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
background: #192887;
}
.graticule {
fill: none;
stroke: #fff;
stroke-width: .5px;
}
.land {
fill: #007421;
}
.dot {
fill: #c7141a;
}
.ring {
fill: none;
stroke: #c7141a;
}
</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 = 500;
var projection = d3.geo.mercator()
.center([113, -3])
.scale(1275)
.translate([width / 2, height / 2])
.clipExtent([[0, 0], [width, height]])
.precision(.1);
var path = d3.geo.path()
.projection(projection);
var graticule = d3.geo.graticule()
.step([5, 5]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
svg.append("path")
.datum(graticule)
.attr("class", "graticule")
.attr("d", path);
svg.append("circle")
.attr("class", "dot")
.attr("transform", "translate(" + projection([100, -8]) + ")")
.attr("r", 8);
setInterval(function() {
svg.append("circle")
.attr("class", "ring")
.attr("transform", "translate(" + projection([100, -8]) + ")")
.attr("r", 6)
.style("stroke-width", 3)
.style("stroke", "red")
.transition()
.ease("linear")
.duration(6000)
.style("stroke-opacity", 1e-6)
.style("stroke-width", 1)
.style("stroke", "brown")
.attr("r", 160)
.remove();
}, 750);
d3.json("/mbostock/raw/4090846/world-50m.json", function(error, world) {
if (error) throw error;
svg.insert("path", ".graticule")
.datum(topojson.feature(world, world.objects.land))
.attr("class", "land")
.attr("d", path);
});
d3.select(self.frameElement).style("height", height + "px");
</script>
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