D3 Examples - Axis Component

Axis Component
This example demonstrates D3's new d3.svg.axis component, which makes it easy to add reference lines and labels to a custom visualization. The axis component even supports automatic transitions! Click on the area to change the scale and watch as new ticks smoothly replace the old ones. Built with D3.js.
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<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.1.3/d3.js"></script>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.1.3/d3.csv.js"></script>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.1.3/d3.time.js"></script>
    <style type="text/css">
​
body {
  font: 10px sans-serif;
  margin: 0;
}
​
path.line {
  fill: none;
  stroke: #666;
  stroke-width: 1.5px;
}
​
path.area {
  fill: #e7e7e7;
}
​
.axis {
  shape-rendering: crispEdges;
}
​
.x.axis line {
  stroke: #fff;
}
​
.x.axis .minor {
  stroke-opacity: .5;
}
​
.x.axis path {
  display: none;
}
​
.y.axis line, .y.axis path {
  fill: none;
  stroke: #000;
}
​
    </style>
  </head>
  <body>
    <script type="text/javascript">
​
var m = [80, 80, 80, 80],
    w = 960 - m[1] - m[3],
    h = 500 - m[0] - m[2],
    parse = d3.time.format("%b %Y").parse;
​
// Scales and axes. Note the inverted domain for the y-scale: bigger is up!
var x = d3.time.scale().range([0, w]),
    y = d3.scale.linear().range([h, 0]),
    xAxis = d3.svg.axis().scale(x).tickSize(-h).tickSubdivide(true),
    yAxis = d3.svg.axis().scale(y).ticks(4).orient("right");
​
// An area generator, for the light fill.
var area = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y0(h)
    .y1(function(d) { return y(d.price); });
​
// A line generator, for the dark stroke.
var line = d3.svg.line()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.price); });
​
d3.csv("readme.csv", function(data) {
​
  // Filter to one symbol; the S&P 500.
  var values = data.filter(function(d) {
    return d.symbol == "S&P 500";
  });
​
  // Parse dates and numbers. We assume values are sorted by date.
  values.forEach(function(d) {
    d.date = parse(d.date);
    d.price = +d.price;
  });
​
  // Compute the minimum and maximum date, and the maximum price.
  x.domain([values[0].date, values[values.length - 1].date]);
  y.domain([0, d3.max(values, function(d) { return d.price; })]).nice();
​
  // Add an SVG element with the desired dimensions and margin.
  var svg = d3.select("body").append("svg:svg")
      .attr("width", w + m[1] + m[3])
      .attr("height", h + m[0] + m[2])
    .append("svg:g")
      .attr("transform", "translate(" + m[3] + "," + m[0] + ")");
​
  // Add the clip path.
  svg.append("svg:clipPath")
      .attr("id", "clip")
    .append("svg:rect")
      .attr("width", w)
      .attr("height", h);
​
  // Add the area path.
  svg.append("svg:path")
      .attr("class", "area")
      .attr("clip-path", "url(#clip)")
      .attr("d", area(values));
​
  // Add the x-axis.
  svg.append("svg:g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + h + ")")
      .call(xAxis);
​
  // Add the y-axis.
  svg.append("svg:g")
      .attr("class", "y axis")
      .attr("transform", "translate(" + w + ",0)")
      .call(yAxis);
​
  // Add the line path.
  svg.append("svg:path")
      .attr("class", "line")
      .attr("clip-path", "url(#clip)")
      .attr("d", line(values));
​
  // Add a small label for the symbol name.
  svg.append("svg:text")
      .attr("x", w - 6)
      .attr("y", h - 6)
      .attr("text-anchor", "end")
      .text(values[0].symbol);
​
  // On click, update the x-axis.
  svg.on("click", function() {
    var n = values.length - 1,
        i = Math.floor(Math.random() * n / 2),
        j = i + Math.floor(Math.random() * n / 2) + 1;
    x.domain([values[i].date, values[j].date]);
    var t = svg.transition().duration(750);
    t.select(".x.axis").call(xAxis);
    t.select(".area").attr("d", area(values));
    t.select(".line").attr("d", line(values));
  });
});
​
    </script>
  </body>
</html>
​
    