D3 Examples - Wavy Map Outlines

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  background: white;
}
​
.land {
  fill: #00ff00;
  stroke: white;
  stroke-width: 1px;
  stroke-linejoin: round;
}
​
.boundary {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}
​
.wave {
  stroke: #ff00ff;
  stroke-linejoin: round;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/d3.geo.projection.v0.min.js"></script>
<script src="https://d3js.org/topojson.v0.min.js"></script>
<script>
​
var width = 960,
    height = 400;
​
var projection = d3.geo.miller()
    .scale(80)
    .translate([width / 2, height / 2]);
​
var path = d3.geo.path()
    .projection(projection);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.json("world-countries-400px.json", function(error, world) {
  svg.selectAll(".wave")
      .data([0, 1, 2, 3, 4])
    .enter().append("path")
      .datum(topojson.object(world, world.objects.land))
      .attr("class", "wave")
      .attr("d", path)
      .attr("stroke-width", function(d, i) { return i * 10; })
      .attr("stroke-opacity", function(d, i) { return 0.15; });
​
  svg.append("path")
      .datum(topojson.object(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path)
});
​
</script>
​
    