Axis Component

This example demonstrates D3’s new 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.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

svg {
  font: 10px sans-serif;
}

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>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 40, right: 40, bottom: 40, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parse = d3.time.format("%b %Y").parse;

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .tickSize(-height);

var yAxis = d3.svg.axis()
    .scale(y)
    .ticks(4)
    .orient("right");

var area = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y0(height)
    .y1(function(d) { return y(d.price); });

var line = d3.svg.line()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.price); });

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("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

d3.csv("readme.csv", type, function(error, data) {
  if (error) throw error;

// Compute the minimum and maximum date, and the maximum price.
  x.domain([data[0].date, data[data.length - 1].date]);
  y.domain([0, d3.max(data, function(d) { return d.price; })]).nice();

svg
      .datum(data)
      .on("click", click);

svg.append("path")
      .attr("class", "area")
      .attr("clip-path", "url(#clip)")
      .attr("d", area);

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

svg.append("g")
      .attr("class", "y axis")
      .attr("transform", "translate(" + width + ",0)")
      .call(yAxis);

svg.append("path")
      .attr("class", "line")
      .attr("clip-path", "url(#clip)")
      .attr("d", line);

svg.append("text")
      .attr("x", width - 6)
      .attr("y", height - 6)
      .style("text-anchor", "end")
      .text(data[0].symbol);

// On click, update the x-axis.
  function click() {
    var n = data.length - 1,
        i = Math.floor(Math.random() * n / 2),
        j = i + Math.floor(Math.random() * n / 2) + 1;
    x.domain([data[i].date, data[j].date]);
    var t = svg.transition().duration(750);
    t.select(".x.axis").call(xAxis);
    t.select(".area").attr("d", area);
    t.select(".line").attr("d", line);
  }
});

// Parse dates and numbers. We assume values are sorted by date.
// Also filter to one symbol; the S&P 500.
function type(d) {
  d.date = parse(d.date);
  d.price = +d.price;
  if (d.symbol === "S&P 500") return d;
}

</script>

https://d3js.org/d3.v3.min.js