D3 Examples - Line Chart D3

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<!doctype html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <title>Line Chart</title>
<style>
  .axis path,
  .axis line{
    fill: none;
    stroke: black;
  }
​
  .tick text{
    font-size: 12px;
  }
​
  .line{
    fill: none;
    stroke: blue;
    stroke-width: 2px;
  }
</style>
</head>
<body>
<script src="https://d3js.org/d3.v4.js"></script>
<script>
​
var margin = {top: 20, right: 100, bottom: 30, left: 100},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
d3.csv("graduates.csv", function(error, data) {
  if (error) throw error;
​
  data.forEach(function(d) {
    d.x = d.Year;
    d.y = +d.Asians;
  });
   
var xScale = d3.scaleLinear()
    .domain([1993,2015])
    .range([0, width]);
​
var yScale = d3.scaleLinear()
    .domain([0, d3.max(data, function(d){ return d.y; })])
    .range([height, 0]);
​
var xAxis = d3.axisBottom(xScale).tickFormat(function(d){ return d.x;})
​
var yAxis = d3.axisLeft(yScale);
  
var line = d3.line()
    .x(function(d) { return xScale(d.x); })
    .y(function(d) { return yScale(d.y); });
​
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 + ")");
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(xScale)
            .ticks(10)
            .tickFormat(d3.format("d")))
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
  
  svg.append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 7)
      .attr("dy", "0.71em")
      .attr("text-anchor", "end")
      .text("Asian Student");
​
  svg.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line(data));
});
</script>
</body>
</html>
    