30. stock return chart

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

forked from EmbraceLife's block: 30. Multi-Series Line Chart

forked from EmbraceLife's block: 30. stock return chart

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

.axis--x path {
  display: none;
}

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

</style>

var svg = d3.select("svg"),
    margin = {top: 20, right: 80, bottom: 30, left: 50},
    width = svg.attr("width") - margin.left - margin.right,
    height = svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var parseTime = d3.timeParse("%Y%m%d");

var x = d3.scaleTime().range([0, width]),
    y = d3.scaleLinear().range([height, 0]),
    z = d3.scaleOrdinal(d3.schemeCategory10);

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

x.domain(d3.extent(returns[0].values, function(d) { return d.date; }));

y.domain(
    d3.extent(returns[0].values, function(d) { return d.return;})
  );

//   z.domain(rr.map(function(c) { return c.id; }));

g.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

g.append("g")
      .attr("class", "axis axis--y")
      .call(d3.axisLeft(y))
    .append("text")
			.attr("x",20)
      .attr("y", 6)
      .attr("dy", "0.71em")
  		.attr("text-anchor", "start")
      .attr("fill", "#000")
      .text("return, 1-base");

console.log("what inside returns", returns);
var a=  g.append("path").datum(returns[0].values) 
      .attr("class", "line")
      .attr("d", function(d) { return line(d); })
      .style("stroke", "red" ); 
console.log("what inside a", a);
  
  
var text1 = g.append("text")
      .datum(returns[0].values)
      .attr("transform", function(d){return "translate(" + x(d[returns[0].values.length - 1].date) + "," + y(d[returns[0].values.length - 1].return) + ")";})
      .attr("x", 3)
      .attr("dy", "0.35em")
      .style("font", "10px sans-serif")
      .text(function(d) { return returns[0].id; });

console.log("text1 has", text1);
});

</script>

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