Uniform Random by mbostock

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500;

var sample = uniformRandomSampler(width, height, 3000);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

d3.timer(function() {
  for (var i = 0; i < 10; ++i) {
    var s = sample();
    if (!s) return true;
    svg.append("circle")
        .attr("cx", s[0])
        .attr("cy", s[1])
        .attr("r", 0)
      .transition()
        .attr("r", 2);
  }
});

function uniformRandomSampler(width, height, numSamplesMax) {
  var numSamples = 0;
  return function() {
    if (++numSamples > numSamplesMax) return;
    return [Math.random() * width, Math.random() * height];
  };
}

</script>