D3 Examples - Random Points

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
​
</style>
<body>
​
<!-- load the d3.js library -->     
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
// set the ranges
var x = d3.scaleLinear().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
​
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 getdata = function() {
  var dataset = []
  for (var i = 0; i < 20; i++) {
    var x = d3.randomUniform(-50,50)();
    var y = d3.randomUniform(-50,50)();
    dataset.push({"x": x, "y": y});
  }
  return dataset
}
  
// Get the data
var data = getdata()
​
// format the data
data.forEach(function(d) {
  d.x = +d.x;
  d.y = +d.y;
});
​
  // scale the range of the data
  x.domain([-50, 50]);
  y.domain([-50, 50]);
​
  // add the dots
  svg.selectAll("dot")
    .data(data)
    .enter().append("circle")
    .attr("r", 5)
    .attr("cx", function(d) { return x(d.x); })
    .attr("cy", function(d) { return y(d.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>
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