D3 Examples - scatterplot using Iris dataset

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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;
  stroke-width: .5px;
}
​
.tooltip {
    position: absolute;
    width: 200px;
    height: 28px;
    pointer-events: none;
}
​
.chart {
  display: inline-block;
  height: 300px;
  width: 400px;
  margin: 30px;
}
  
.container {
  display: grid;
  grid-column-gap: 0px;
  grid-template-columns: auto auto auto auto;
  padding: 10px;
}
​
</style>
<body>
  
<div align="center">
Scatterplot Matrix using Iris Dataset
</div>
  <div class="container" style="float: left;"></div>
  <div class="legend" style="float: left;"></div>
<script src="https://d3js.org/d3.v4.min.js"></script>
​
<script>
​
var margin = {top: 10, right: 10, bottom: 20, left: 20},
    width = 400 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom;
​
var color = d3.scaleOrdinal(d3.schemeCategory20);
​
var tooltip = d3.select("body").append("div")
                    .attr("class", "tooltip")
                    .style("opacity", 0);
​
function scatterplot(el, data, w, h, var_x, var_y, var_r, var_color) {
​
    var x = d3.scaleLinear()
    .range([0, w]);
​
  var y = d3.scaleLinear()
      .range([h, 0]);
​
  var r = d3.scaleSqrt()
      .range([1,3]);
​
  // https://observablehq.com/@d3/axis-ticks
  var xAxis = d3.axisBottom()
        .ticks(2)
      .scale(x);
​
  var yAxis = d3.axisLeft()
         .ticks(5)
      .scale(y);
​
    x.domain(d3.extent(data, function(d){
        return d[var_x];
    })).nice();
​
    y.domain(d3.extent(data, function(d){
        return d[var_y];
    })).nice();
​
    r.domain(d3.extent(data, function(d){
        return d[var_r];
    })).nice();
​
  var svg = el.append("svg")
    .attr("width", w + margin.left + margin.right)
    .attr("height", h + margin.bottom + margin.top)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
  svg.append('g')
    .attr('transform', 'translate(0,' + h + ')')
    .attr('class', 'x axis')
    .call(xAxis);
  
  svg.append('g')
    .attr('transform', 'translate(0,0)')
    .attr('class', 'y axis')
    .call(yAxis);
​
​
  svg.selectAll(".dot")
    .data(data)
  .enter().append("circle")
    .attr("class", "dot")
    .attr("r", function(d) { return r(d[var_r]); })
    .attr("cx", function(d) { return x(d[var_x]); })
    .attr("cy", function(d) { return y(d[var_y]); })
    .style("fill", function(d) { return color(d[var_color]); })
    .on("mouseover", function(d){
            // highlight on
        d3.selectAll(".dot").filter(function(e) {
        return e === d;
      })
      .style("stroke-width", 10)
         })
        .on("mouseout", function(d){
        d3.selectAll(".dot").filter(function(e) {
        return e === d;
      })
      .style("stroke-width", .5)
        })
        .on("click", function(d){
            // selection on/off
        });
  
 }
  
d3.csv('iris.csv', function(error, data){
    data.forEach(function(d){
    d.sepal_length = +d.sepal_length;
    d.sepal_width  = +d.sepal_width;
    d.petal_length = +d.petal_length;
    d.petal_width  = +d.petal_width;
    });
​
var dims = ["sepal_length", "sepal_width", "petal_width", "petal_length"];
  
dims.forEach(function(d) {
  
  dims.forEach(function(e) {
    
        scatterplot(d3.select(".container").append("div"), data, width/dims.length, height/dims.length, d, e, "petal_length", "species")
    
  });
})
​
  var clicked = null
​
  
  // color.domain()
  var legend = d3.select(".legend").append("svg")
      .attr("width", 200)
      .attr("height", 400)
  .selectAll("g")
    .data(color.domain())
  .enter().append("g")
    .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; })
​
  legend.append("rect")
    .style("fill", function(d) { return color(d); })
        .attr("width", 20)
        .attr("height", 20)
        .on("click", function(d) {
​
            // Sets the current cateogry opacity
        d3.selectAll(".symbol").style("opacity", 1)
          
            if(clicked !== d) {
               
          d3.selectAll(".symbol")
            .filter(function(e) {
            return e.species !== d
          })
          .style("opacity", 0.1);
          
          // memorize the clicked category
          clicked = d;
          
        } else {
          
          // reset
          clicked = null;
        } 
    });
 
  legend.append("text")
    //  .attr("x", width - 24)
      .attr("y", 9)
        .attr("dx", 20)
      .attr("dy", ".35em")
  //    .style("text-anchor", "end")
      .text(function(d) { return d; });
  
  
});
  
</script>
    