D3 Examples - line chart de l'enfer

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .line {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
    .axis {
      font: 10px sans-serif;
    }
​
    .axis path,
    .axis line {
      fill: none;
      stroke: black;
      stroke-width: 2px;
      shape-rendering: crispEdges;
    }
    
    .overlay {
      fill: none;
      pointer-events: all;
    }
​
    .focus circle {
      fill: red;
    }
​
    .hover-line {
      stroke: black;
      stroke-width: 1px;
      stroke-dasharray: 5,4;
    }
    
    .circle {
      fill:#E6E6E6;
    }
  </style>
</head>
​
<body>
  <script>
​
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500);
​
    var width = 800;
    var height = 400;
​
    // See formats https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    // Data sample {"name": "G", "value": 10, "date": "2016-07"}
    var parseDate = d3.timeParse("%Y-%m");
    var displayDate = d3.timeFormat("%b %y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scaleTime()
        .range([0, width]);
​
        // Linear scale
    var y = d3.scaleLinear()
        .range([height, height - 200]);
​
    // Define the axes
    var yAxis = d3.axisLeft().scale(y).ticks(5);
    
    var line = d3.line()
        .x(function(d) { return x(d.date); })
        .y(function(d) { return y(d.value); });
    
    var g = svg.append("g")
        .attr("transform", "translate(50, 0)")
    
    d3.json("dataset.json", function(error, data) {
        if (error) throw error;
​
      // Pre-processing
      data.forEach(function(d) {
                d.value = +d.value;
        d["date"] = parseDate(d["date"]);
      });
      
      x.domain(d3.extent(data, function(d) { return d.date; }));
            y.domain([0, d3.max(data, function(d) { return d.value; })]);
      
      svg.selectAll(".label").data(data).enter()
       .append("text")
        .attr("class", "label")
        .text(function(d, i) { return displayDate(d.date); })
        .attr("y", 420)
        .attr("x", function(d) { return x(d.date); })
        .style("font-size", 10)
        .style("font-family", "monospace");
​
      // Display last value
      g.selectAll(".value").data([data[data.length -1]]).enter()
       .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "value")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", width + 10)
        .style("font-size", 20)
        .style("font-family", "monospace");
​
      g.selectAll(".line").data([data]).enter().append("path")
        .attr("class", "line")
        .attr("d", line);
      
      // Add the scatterplot
      g.selectAll("dot")
          .data(data)
          .enter().append("circle")
          .attr("r", 8.5)
          .attr("cx", function(d) { return x(d.date); })
          .attr("cy", function(d) { return y(d.value); });
​
      var focus = g.append("g")
        .attr("class", "focus")
        .style("display", "none");
​
      focus.append("line")
          .attr("class", "x-hover-line hover-line")
          .attr("y1", 0)
          .attr("y2", height);
​
      focus.append("line")
          .attr("class", "y-hover-line hover-line")
          .attr("x1", width)
          .attr("x2", width);
​
      focus.append("circle")
          .attr("r", 8.5);
​
      focus.append("text")
          .attr("x", 15)
          .attr("dy", ".31em");
          
      svg.append("rect")
        .attr("class", "overlay")
        .attr("width", width)
        .attr("height", height)
        .on("mouseover", function() { focus.style("display", null); })
        .on("mouseout", function() { focus.style("display", null); })
        .on("mousemove", mousemove);
      
      bisectDate = d3.bisector(function(d) { return d.year; }).left;
      function mousemove() {
        var x0 = x.invert(d3.mouse(this)[0]),
          i = bisectDate(data, x0, 1),
          d0 = data[i - 1],
          d1 = data[i],
          d = x0 - d0.year > d1.year - x0 ? d1 : d0;
        console.log(height)
        console.log(y(d.value))
        focus.attr("transform", "translate(" + 0 + "," + y(d.value) + ")");
        focus.select("text").text(function() { return d.value; });
        focus.select(".x-hover-line").attr("y2", height - y(d.value));
        focus.select(".y-hover-line").attr("x2", width + width);
     }
      
    });
​
  </script>
</body>
​
    