D3 bar chart with line & circle

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forked from romsson's block: D3 bar chart without data-binding

forked from anonymous's block: D3 bar chart with data-binding

forked from romsson's block: D3 bar chart with data-binding

forked from romsson's block: D3 bar chart with line & circle

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    rect {
      fill: white;
      stroke: black;
      stroke-width: 1;
    }
    
    path {
      fill: none;
      stroke: black;
      stroke-width: 1;
    }
  </style>
</head>

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

function generate_data() {
      return d3.range(10).map(function() {
        return Math.random();
      });
    }
    
    var data = generate_data();
    
    var y = d3.scaleLinear()
    	.domain([0, d3.max(data)])
    	.range([0, +d3.select("svg").attr("height")/3]);

var r = d3.scaleLinear()
    	.domain([0, d3.max(data)])
    	.range([2, 10]);

// ordinal
    var x = d3.scaleBand()
    	.domain(d3.range(10))
    	.range([0, +d3.select("svg").attr("width")]);
    
		var s = svg.selectAll("rect").data(data);
    
    s.enter()
     .append("rect")
      
     svg.selectAll("rect").data(data)
	    .attr("width", function(d, i) { return x.bandwidth(); })
      .attr("height", function(d, i) { return y(d); })
      .attr("x", function(d, i) { return x(i); })
      .attr("y",  function(d) { return 200 - y(d); })
 
		var s = svg.selectAll("circle").data(data);
    
    s.enter()
     .append("circle")
      
     svg.selectAll("circle").data(data)
	    .attr("width", function(d, i) { return x.bandwidth(); })
     .attr("height", function(d, i) { return y(d); })
      .attr("cx", function(d, i) { return x(i) + x.bandwidth() / 2; })
      .attr("cy", function(d) { return 200 - y(d); })
     	.attr("r", function(d) { return r(d); })
 
     
    var line = d3.line()
     .x(function(d, i) { return x(i) + x.bandwidth() /2 ; })
     .y(function(d) { return 200 - y(d); });

var s = svg.selectAll("path").data([data]).enter()
    	.append("path")
    	.attr("d", function(d) { return line(d); })

</script>
</body>

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