D3 Examples - sin circle

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <div class="container">
    <section class="canvas" id="canvas"></section>
    </div>
  
  <script>
        var arr = [];
    for(var i=0; i<50; i++){
      var a = Math.random();
      arr.push({
        a:a,
        b:Math.sin(a*Math.PI*2)/2+.5,
        c:Math.random()
      });
    }
    
    var plot = d3.select('.canvas')
        .append('svg')
        .attr('width', 960)
        .attr('height', 500)
        .append('g')
        .attr('transform', 'translate(' + 30+ ',' + 30 + ')')
    
    arr.forEach(function(d){
      plot.append('circle')
        .attr('cx', d.a*900)
        .attr('cy', d.b*450)
        .attr('r', d.c*10);
    });
​
  </script>
</body>
​
    