D3 Examples - simple polygon and point

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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; }
    
    polygon { 
      fill: CadetBlue 
    }
  </style>
</head>
​
<body>
<script>
  var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 600 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
  
    var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform",
          "translate(" + margin.left + "," + margin.top + ")");
  
  
  var x = d3.scaleLinear().range([0, 500]);
    var y = d3.scaleLinear().range([500, 0]);
  
  x.domain([0, 50]);
  y.domain([0, 50]);
  
  var point = {"x": 24, "y": 31}
  
  var poly = [{"x":10, "y":50},
        {"x":20,"y":20},
        {"x":50,"y":10},
        {"x":30,"y":30}];
  
  
  svg.selectAll("polygon")
    .data([poly])
  .enter().append("polygon")
    .attr("points",function(d) { 
        return d.map(function(d) {
            return [x(d.x),y(d.y)].join(",");
        }).join(" ");
    });
  
  svg.append("circle")
    .attr("r", 4)
    .attr("cx", x(point.x))
    .attr("cy", y(point.y))
  
    // add the X Axis
  svg.append("g")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x));
​
  // add the Y Axis
  svg.append("g")
    .call(d3.axisLeft(y));
​
</script>
</body>
​
    