D3 Examples - Scatterplot

Scatterplot
This scatterplot is constructed from a TSV file storing the dimensions of sepals and petals of various iris flowers. The chart employs conventional margins and a number of D3 features:
d3.tsv - load and parse data
d3.scale.linear - x- and y-position encoding
d3.scale.ordinal - color encoding
d3.extent - compute domains
d3.svg.axis - display axes
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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.dot {
  stroke: #000;
}
​
.d3-tip {
  line-height: 1;
  font-weight: bold;
  padding: 12px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
var x = d3.scale.linear().domain([-1000, 2018])
    .range([0, width]);
​
var y = d3.scale.linear().domain([0,6])
    .range([height, 0]);
​
var color = d3.scale.category10();
​
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");
​
 var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "<strong>Frequency:</strong> <span style='color:red'>" + d.sepalLength + "</span>";
  });
​
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 + ")");
​
svg.call(tip);
  
d3.csv("data.csv", function(error, data) {
  if (error) throw error;
​
  data.forEach(d => {
    d.year = +d.year;
    d.index = 0;
  });
  let i = 0;
  let currYear = -1000;
  data.forEach((elem) => {
    if(currYear === elem.year) {
      elem.index = i;
      i++;
    } else {
      i = 0;
      elem.index= i;
      currYear = elem.year;
    }
  });
​
  //x.domain(d3.extent(data, function(d) { return d.year; })).nice();
  //y.domain(d3.extent(data, function(d) { return d.index; })).nice();
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Sepal Width (cm)");
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Sepal Length (cm)")
​
  svg.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", 3.5)
      .attr("cx", function(d) { return x(d.year); })
      .attr("cy", function(d) { return y(d.index); })
      .style("fill", function(d) { return color(d.category); })
        .on('mouseover', tip.show)
        .on('mouseout', tip.hide);
​
  var legend = svg.selectAll(".legend")
      .data(color.domain())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
​
  legend.append("rect")
      .attr("x", width - 18)
      .attr("width", 18)
      .attr("height", 18)
      .style("fill", color);
​
  legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".35em")
      .style("text-anchor", "end")
      .text(function(d) { return d; });
​
});
​
</script>
​
    