D3 Examples - Zoom to Domain

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.area {
  fill: steelblue;
  clip-path: url(#clip);
}
​
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;
​
var parseDate = d3.timeParse("%b %Y");
​
var x = d3.scaleTime().range([0, width]),
    y = d3.scaleLinear().range([height, 0]);
​
var xAxis = d3.axisBottom(x),
    yAxis = d3.axisLeft(y);
​
var zoom = d3.zoom()
    .scaleExtent([1, 32])
    .translateExtent([[0, 0], [width, height]])
    .extent([[0, 0], [width, height]])
    .on("zoom", zoomed);
​
var area = d3.area()
    .curve(d3.curveMonotoneX)
    .x(function(d) { return x(d.date); })
    .y0(height)
    .y1(function(d) { return y(d.price); });
​
svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);
​
var g = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
d3.csv("sp500.csv", type, function(error, data) {
  if (error) throw error;
​
  x.domain(d3.extent(data, function(d) { return d.date; }));
  y.domain([0, d3.max(data, function(d) { return d.price; })]);
​
  g.append("path")
      .datum(data)
      .attr("class", "area")
      .attr("d", area);
​
  g.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  g.append("g")
      .attr("class", "axis axis--y")
      .call(yAxis);
​
  var d0 = new Date(2003, 0, 1),
      d1 = new Date(2004, 0, 1);
​
  // Gratuitous intro zoom!
  svg.call(zoom).transition()
      .duration(1500)
      .call(zoom.transform, d3.zoomIdentity
          .scale(width / (x(d1) - x(d0)))
          .translate(-x(d0), 0));
});
​
function zoomed() {
  var t = d3.event.transform, xt = t.rescaleX(x);
  g.select(".area").attr("d", area.x(function(d) { return xt(d.date); }));
  g.select(".axis--x").call(xAxis.scale(xt));
}
​
function type(d) {
  d.date = parseDate(d.date);
  d.price = +d.price;
  return d;
}
​
</script>
​
    