area-staff testing

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<!DOCTYPE html>
<meta charset="utf-8">
<script src="//d3js.org/d3.v3.min.js"></script>
<style>

svg {
  font: 10px sans-serif;
}

.axis {
  shape-rendering: crispEdges;
}

.axis path, .axis line {
  fill: none;
  stroke-width: .5px;
}

.x.axis path {
  stroke: #000;
}

.x.axis line {
  stroke: #fff;
  stroke-opacity: .5;
}

.y.axis line {
  stroke: #ddd;
}

path.line {
  fill: none;
  stroke: #000;
  stroke-width: .5px;
}

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

</style>
<body>
<script>

var margin = {top: 20, right: 60, bottom: 30, left: 20},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

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

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

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

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickSize(-height, 0)
    .tickPadding(6);

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("right")
    .tickSize(-width)
    .tickPadding(6);

var area = d3.svg.area()
    .interpolate("step-after")
    .x(function(d) { return x(d.date); })
    .y0(y(0))
    .y1(function(d) { return y(d.value); });

var line = d3.svg.line()
    .interpolate("step-after")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.value); });

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 + ")");

var zoom = d3.behavior.zoom()
    .on("zoom", draw);

var gradient = svg.append("defs").append("linearGradient")
    .attr("id", "gradient")
    .attr("x2", "0%")
    .attr("y2", "100%");

gradient.append("stop")
    .attr("offset", "0%")
    .attr("stop-color", "#fff")
    .attr("stop-opacity", .5);

gradient.append("stop")
    .attr("offset", "100%")
    .attr("stop-color", "#999")
    .attr("stop-opacity", 1);

svg.append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("x", x(0))
    .attr("y", y(1))
    .attr("width", x(1) - x(0))
    .attr("height", y(0) - y(1));

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

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

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

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

svg.append("rect")
    .attr("class", "pane")
    .attr("width", width)
    .attr("height", height)
    .call(zoom);

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

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

x.domain([new Date(2014, 0, 1), new Date(2015, 0, 0)]);
  y.domain([0, d3.max(data, function(d) { return d.value; })]);
  zoom.x(x);

svg.select("path.area").data([data]);
  svg.select("path.line").data([data]);
  draw();
});

function draw() {
  svg.select("g.x.axis").call(xAxis);
  svg.select("g.y.axis").call(yAxis);
  svg.select("path.area").attr("d", area);
  svg.select("path.line").attr("d", line);
}

</script>

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