Old school D3 from simpler times

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GitNoise

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connected dots (curves)

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-path.v1.min.js"></script>
<script src="https://d3js.org/d3-shape.v1.min.js"></script>

<style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .myLine { 
      stroke-width: 1px;
      stroke: steelblue;
      fill: none;
    }
    
    circle {
      fill: orange;
    }
  </style>
</head>

<body>
  <svg>
  </svg>
  
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("svg")
      .attr("width", 960)
      .attr("height", 500)

var data = [
      {x: 100, y: 100, def: true},
      {x: 300, y: 200, def: true},
      {x: 200, y: 300, def: true},
      {x: 100, y: 200, def: true},
      
    ]
     
    var line = d3.line()
      .x(function(d) { return d.x; })
      .y(function(d) { return d.y; })
    	.curve(d3.curveStepAfter)
    	.defined((d)=> d.def);
    
    svg.append("path")
    	.datum(data)
    	.attr("d", line)
    	.classed("myLine", true);
    
    svg.selectAll("circle")
    	.data(data)
    	.enter()
    		.append("circle") 
    		.attr("cx", (d) => d.x)
    		.attr("cy",(d) => d.y)
    		.attr("r", 5)
    
  </script>
</body>

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

https://d3js.org/d3-path.v1.min.js

https://d3js.org/d3-shape.v1.min.js