Class: Line Graph

<!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; }
    
    path{
      fill: none;
      stroke: grey;
      stroke-width: 5;
    }
    
  </style>
</head>

<body>
  <script>
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

var data = [[10, 10], [20, 70], [50, 30], [55, 85], [90, 90]]

var xScale = d3.scaleLinear()
  	.domain([0, 100])
  	.range([0,960]); //chart becomes flipped if enter [960, 0] into range instead
  
  var yScale = d3.scaleLinear()
  	.domain([0, 100])
  	.range([500,0]);
  
	var line = d3.line()
  	.x(function(d){return xScale(d[0])
                  })
  	.y(function(d){return yScale(d[1])
    })
  	.curve(d3.curveBasis);
  
  console.log(line(data));
    
svg.append("path")
	.datum(data) //.datum tells the computer to create ONE thing, vs plotting multiple circles
	.attr("d", line); //The shape of an SVG Path element is defined by one attribute: d
    
  </script>
</body>

https://d3js.org/d3.v4.min.js