D3 Examples

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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; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
    
 
​
    var flag = [{"fill":"white","x":300, "y": -4,}, 
               {"fill":"#C8102E","x":300, "y": 193},
               ]
    /*
    unique properties
    */
    console.log(flag)
    
    svg.selectAll ("rect")
    .data(flag)
    .enter()
    .append("rect")
    .attr("y", function (d) {return d.y;})
    .attr("x", function(d) {return d.x;})
    .attr("width", 300)
    .attr("height", 200)
    .attr("fill",function(d){return d.fill;})
    
      
  
    
    svg.append("circle")
    .attr("cy", 192)
    .attr("cx", 454)
    .attr("r", 69)
    .attr("fill","white")
    .attr ("stroke", "black")
    
  
  
  </script>
</body>
​
    