Multi-Series Line Chart

.block

license: gpl-3.0

README.md

This line chart is constructed from a TSV file storing the daily average temperatures of New York, San Francisco and Austin over the last year. The chart employs conventional margins and a number of D3 features:

• d3.tsv - load and parse data
• d3.time.format - parse dates
• d3.time.scale - x-position encoding
• d3.scale.linear - y-position encoding
• d3.scale.category10, a d3.scale.ordinal - color encoding
• d3.extent, d3.min and d3.max - compute domains
• d3.keys - compute column names
• d3.svg.axis - display axes
• d3.svg.line - display line shape

forked from mbostock's block: Multi-Series Line Chart

data.tsv

data.txt

date	Guinea	Liberia	"Sierra Leone"
3/1/2014	0	0	0	
3/2/2014	0	0	0	
3/3/2014	0	0	0	
3/4/2014	0	0	0	
3/5/2014	0	0	0	
3/6/2014	0	0	0	
3/7/2014	0	0	0	
3/8/2014	0	0	0	
3/9/2014	0	0	0	
3/10/2014	0	0	0	
3/11/2014	0	0	0	
3/12/2014	0	0	0	
3/13/2014	0	0	0	
3/14/2014	0	0	0	
3/15/2014	0	0	0	
3/16/2014	0	0	0	
3/17/2014	0	0	0	
3/18/2014	0	0	0	
3/19/2014	0	0	0	
3/20/2014	0	0	0	
3/21/2014	0	0	0	
3/22/2014	0	0	0	
3/23/2014	0	0	0	
3/24/2014	0	0	0	
3/25/2014	86	0	0	
3/26/2014	86	0	0	
3/27/2014	103	8	6	
3/31/2014	112	8	0	
4/1/2014	122	8	0	
4/2/2014	127	8	0	
4/7/2014	151	18	0	
4/10/2014	157	22	0	
4/17/2014	197	27	0	
4/21/2014	203	27	0	
4/23/2014	208	34	0	
4/30/2014	221	13	0	
5/5/2014	231	13	0	
5/14/2014	233	12	0	
5/23/2014	258	12	0	
5/27/2014	258	12	1	
5/28/2014	281	12	16	
6/2/2014	291	13	50	
6/5/2014	344	13	81	
6/10/2014	372	15	89	
6/11/2014	376	15	117	
6/18/2014	398	33	97	
6/24/2014	390	51	158	
7/2/2014	413	107	239	
7/7/2014	412	115	252	
7/8/2014	408	131	305	
7/14/2014	409	142	337	
7/16/2014	406	172	386	
7/21/2014	410	196	442	
7/24/2014	415	224	454	
7/28/2014	427	249	525	
7/31/2014	460	329	533	
8/3/2014	472	391	574	
8/4/2014	485	486	646	
8/8/2014	495	554	717	
8/12/2014	506	599	730	
8/13/2014	510	670	783	
8/15/2014	519	786	810	
8/19/2014	543	834	848	
8/21/2014	579	972	907	
8/22/2014	607	1082	910	
8/28/2014	648	1378	1026	
9/6/2014	812	1871	1261	
9/8/2014	862	2046	1361	
9/12/2014	861	2081	1424	
9/16/2014	936	2407	1620	
9/18/2014	942	2710	1673	
9/22/2014	1008	3022	1813	
9/24/2014	1022	3280	1940	
9/26/2014	1074	3458	2021	
10/1/2014	1157	3696	2304	
10/3/2014	1199	3834	2437	
10/8/2014	1298	3924	2789	
10/10/2014	1350	4076	2950	
10/15/2014	1472	4249	3252	
10/17/2014	1519	4262	3410	
10/22/2014	1540	4665	3706	
10/25/2014	1553	4665	3896	
10/29/2014	1906	6535	5235	
10/31/2014	1667	6535	5338	
11/5/2014	1731	6525	4759	
11/7/2014	1760	6619	4862	
11/12/2014	1878	6822	5368	
11/14/2014	1919	6878	5586	
11/19/2014	1971	7069	6073	
11/21/2014	2047	7082	6190	
11/26/2014	2134	7168	6599	
11/28/2014	2155	7635	7109	
12/3/2014	2164	7635	7312	
12/10/2014	2292	7719	7897	
12/17/2014	2416	7797	8356	
12/24/2014	2597	7862	9004	
12/31/2014	2707	8018	9446	
1/7/2015	2775	8157	9780	
1/14/2015	2806	8331	10124	
1/21/2015	2871	8478	10340	
1/28/2015	2917	8622	10518	
2/4/2015	2975	8745	10740	
2/11/2015	3044	8881	10934	
2/18/2015	3108	9007	11103	
2/25/2015	3155	9238	11301	
3/4/2015	3219	9249	11466	
3/11/2015	3285	9343	11619	
3/18/2015	3389	9526	11751	
3/25/2015	3429	9602	11841	
4/1/2015	3492	9712	11974	
4/8/2015	3515	9862	12138	
4/15/2015	3548	10042	12201	
4/22/2015	3565	10212	12267	
4/29/2015	3584	10322	12371	
5/6/2015	3589	10564	12440	
5/13/2015	3597	10604	12523	
5/20/2015	3635	10666	12632	
5/27/2015	3641	10666	12706	
6/3/2015	3652	10666	12827	
6/10/2015	3670	10666	12901	
6/17/2015	3674	10666	12965	
6/24/2015	3718	10666	13059	
7/1/2015	3729	10666	13119	
7/8/2015	3748	10670	13155	
7/15/2015	3760	10673	13209	
7/22/2015	3783	10672	13250	
7/29/2015	3786	10672	13290	
8/5/2015	3784	10672	13406	
8/12/2015	3787	10672	13470	
8/19/2015	3786	10672	13494	
8/26/2015	3792	10672	13541	
9/3/2015	3792	10672	13638	
9/10/2015	3792	10672	13683	
9/17/2015	3792	10672	13756	
9/24/2015	3800	10672	13823	
10/1/2015	3805	10672	13911	
10/8/2015	3804	10672	13945	
10/15/2015	3800	10672	13982	
10/22/2015	3803	10672	14001	
10/29/2015	3806	10672	14061	
11/5/2015	3810	10672	14089	
11/11/2015	3805	10672	14122	
11/18/2015	3804	10672	14122	
11/25/2015	3804	10675	14122	
12/2/2015	3804	10675	14122	
12/9/2015	3804	10675	14122	
12/16/2015	3807	10675	14122	
12/23/2015	3804	10675	14122	
12/30/2015	3804	10675	14122	
1/6/2016	3804	10675	14122	
1/13/2016	3804	10675	14122	
1/20/2016	3804	10675	14123	
1/27/2016	3804	10675	14124	
2/3/2016	3804	10675	14124	
2/10/2016	3804	10675	14124	

index.html

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

body {
  font: 10px sans-serif;
}
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

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

var margin = {top: 20, right: 80, bottom: 70, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%m/%d/%Y").parse;

var x = d3.time.scale()

    .range([0, width]);

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

var color = d3.scale.category10();

var xAxis = d3.svg.axis()
    .scale(x)
		.ticks(d3.time.months)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

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

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 + ")");

d3.tsv("data.txt", function(error, data) {
  if (error) throw error;

  color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; }));

  data.forEach(function(d) {
    d.date = parseDate(d.date);
  });

  var cities = color.domain().map(function(name) {
    return {
      name: name,
      values: data.map(function(d) {
        return {date: d.date, temperature: +d[name]};
      })
    };
  });

  x.domain(d3.extent(data, function(d) { return d.date; }));

  y.domain([
    d3.min(cities, function(c) { return d3.min(c.values, function(v) { return v.temperature; }); }),
    d3.max(cities, function(c) { return d3.max(c.values, function(v) { return v.temperature; }); })
  ]);

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
  		.selectAll("text")
  		.style("text-anchor","end")
  		.attr("transform", function(d) {
     return "rotate(-45)"
   });

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Number of Cases");

  var city = svg.selectAll(".city")
      .data(cities)
    .enter().append("g")
      .attr("class", "city");

  city.append("path")
      .attr("class", "line")
      .attr("d", function(d) { return line(d.values); })
      .style("stroke", function(d) { return color(d.name); });

  city.append("text")
      .datum(function(d) { return {name: d.name, value: d.values[d.values.length - 1]}; })
      .attr("transform", function(d) { return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")"; })
      .attr("x", 3)
      .attr("dy", ".35em")
      .text(function(d) { return d.name; });
});

</script>