D3 Examples - Geographic Clipping: Holes

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
path {
  fill: none;
  stroke: #000;
}
​
circle {
  fill: none;
  stroke: #000;
  stroke-width: 3px;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v2.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/d3/d3-plugins/clip/geo/clip/clip.js"></script>
<script src="resample.js"></script>
<script>
​
var width = 400,
    height = 400;
​
var origin = [0, 0],
    velocity = [-.01, .01],
    t0 = Date.now();
​
var projection = d3.geo.azimuthal()
    .translate([width / 2, height / 2])
    .mode("orthographic")
    .origin(origin)
    .scale(180);
​
var clip = d3.geo.clip()
    .origin(origin);
​
var path = d3.geo.path()
    .projection(projection);
​
var feature = {
  type: "Polygon",
  coordinates: [
    [[-45, 45], [45, 45],   [45, -45], [-45, -45], [-45, 45]],
    [[-40, 40], [-40, -40], [-5, -40], [-5, 40],   [-40, 40]],
    [[5, 40],   [5, -40],   [40, -40], [40, 40],   [5, 40]]
  ].map(d3.geo.resample)
};
​
var a = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("path")
    .datum(feature);
​
var b = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("path")
    .style("stroke", "blue")
    .datum(feature);
​
d3.timer(function() {
  var t = Date.now() - t0,
      o = [origin[0] + t * velocity[0], origin[1] + t * velocity[1]];
  projection.origin(o);
  clip.origin(o);
  a.attr("d", function(d) { return path(clip(d)); });
  b.attr("d", path);
});
​
</script>
    