D3 Examples - sin wave

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="d3-scale-radial.js"></script>
  <style>
    body { 
      margin:0;
      position:fixed;
      top:0;
      right:0;
      bottom:0;
      left:0; 
    }
    #chart-1 {
      margin: 40px;
    }
    .line {
      fill: none;
    }
  </style>
</head>
​
<body>
  <script>
    var margin = {top: 40, right: 40, bottom: 40, left: 40},
        width = window.innerWidth - margin.left - margin.right,
        height = window.innerHeight - margin.top - margin.bottom,
        fullwidth = window.innerWidth,
        fullheight = window.innerHeight;
    
    var x = d3.scaleLinear()
                    .range([0, width]);
    var y = d3.scaleRadial()
                    .range([height, 0]);
    
        var chart = d3.select("body")
                             .append("div")
                             .attr("class", "chart")
                             .style("background-color", "lightgrey")
    
    var data = d3.range(40).map(function(i) {
      return {x: i / 39, y: (Math.sin(i / 3) + 2) / 4};
    });
​
    var line = d3.line()
        .defined(function(d) { return d; })
        .x(function(d){ return x(d.x); })
        .y(function(d){ return y(d.y); })
    
    var svg = d3.select(".chart")      
      .append("svg")
        .datum(data)
      .attr("id", "chart-1")
      .attr("width", fullwidth)
      .attr("height", fullheight)
        .append("g");
    
    svg.append("path")
        .attr("class", "line")
        .attr("d", line);
    
    svg.selectAll(".dot")
        .data(data.filter(function(d) {return d;}))
        .enter().append("circle")
        .attr("class", "dot")
        .attr("cx", line.x())
      .attr("cy", line.y())
        .attr("r", 2)
    
  </script>
</body>
​
    