Line chart with d3.brush

Built with blockbuilder.org

forked from twlynch's block: Line chart with d3.brush

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

.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}

.line {
    fill: none;
    stroke: steelblue;
    stroke-width: 1.5px;
	clip-path: url(#clip);
}

</style>
<svg width="720" height="420"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/queue.v1.min.js"></script>

queue()
    .defer(d3.csv, "sp500.csv", type)
    .await(ready);

var parseDate = d3.timeParse("%b %Y");

function ready(error, data) {

if (error) throw error;
  
  var svg = d3.select("svg"),
    margin = {top: 30, right: 20, bottom: 150, left: 40},
    margin2 = {top: 320, right: 20, bottom: 30, left: 40},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    height2 = +svg.attr("height") - margin2.top - margin2.bottom;
		
	var x = d3.scaleTime().range([0, width]),
		x2 = d3.scaleTime().range([0, width]),
		y = d3.scaleLinear().range([height, 0]),
		y2 = d3.scaleLinear().range([height2, 0]);

var xAxis = d3.axisBottom(x),
		xAxis2 = d3.axisBottom(x2),
		yAxis = d3.axisLeft(y);

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

var line2 = d3.line()
		.x(function(d) { return x2(d.date); })
		.y(function(d) { return y2(d.price); });
		
	svg.append("defs").append("clipPath")
		.attr("id", "clip")
	  .append("rect")
		.attr("width", width)
		.attr("height", height);

var focus = svg.append("g")
		.attr("class", "focus")
		.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var context = svg.append("g")
		
		.attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");

var leftHandle = 0,
		rightHandle = 1140	
		
	var currentExtent = [0,0]
	
  var brush = d3.brushX()
    .extent([[leftHandle, 0], [rightHandle, height2]])
	.on("brush start", updateCurrentExtent)
    .on("brush end", brushed);
  
  var zoom = d3.zoom()
    .scaleExtent([1, Infinity])
    .translateExtent([[0, 0], [width, height]])
    .extent([[0, 0], [width, height]])
    .on("zoom", zoomed);
	
  x.domain(d3.extent(data, function(d) { return d.date; }));
  y.domain([0, d3.max(data, function(d) { return d.price; })]);
  x2.domain(x.domain());
  y2.domain(y.domain());

focus.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line);

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

focus.append("g")
      .attr("class", "axis axis--y")
      .call(yAxis);

context.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line2);

context.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height2 + ")")
      .call(xAxis2);

context.append("g")
      .attr("class", "brush")
	  .on("click", brushed)
	  .call(brush)
	  .call(brush.move, [new Date(2000,0,1),new Date(2001,0,1)].map(x));

svg.append("rect")
      .attr("class", "zoom")
      .attr("width", width)
      .attr("height", height)
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
      //.call(zoom);
	  
	function updateCurrentExtent() {
	currentExtent = d3.brushSelection(this);
	}

function zoomed() {
	  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
	  var t = d3.event.transform;
	  x.domain(t.rescaleX(x2).domain());
	  focus.select(".line").attr("d", line);
	  focus.select(".axis--x").call(xAxis);
	  context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
	}
	
}

function type(d) {
  d.date = parseDate(d.date);
  d.price = +d.price;
  return d;
}

</script>

Modified http://d3js.org/queue.v1.min.js to a secure url

https://d3js.org/d3.v4.min.js

https://d3js.org/queue.v1.min.js