Connected scatter plot

forked from romsson's block: scatterplot in progress

forked from qazaqs's block: scatterplot in progress

forked from as-eldlc's block: Iris scatter plot

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    
    circle {
      fill: black;
      stroke: black;
      stroke-width: .5px;
    }
    .legend {
      font-family: "Arial";
      font-size: 12px;
    }
    .chart {
      display: inline-block;
      width : 400px;
      height: 400px;
      margin-right: 20px;
      
    }
  </style>
</head>

<body>
  <div id="charts">
    <div id="chart-left" class="chart"></div>
    <div id="chart-right" class="chart"></div>
  </div>
  <script>
  
	var margin = {top: 20, right: 20, bottom: 30, left: 40}
  
  function scatterplot(el, data, w, h, var_x, var_y, var_c, var_r){
			
			var width = w - margin.left - margin.right;
      var height = h - margin.top - margin.bottom;
    
      var svg = el.append("svg")
      .attr("width", w + margin.left + margin.right)
      .attr("height", h + margin.top + margin.bottom)
    	.append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
 
      var color = d3.scaleOrdinal(d3.schemeCategory20);

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

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

var r = d3.scaleSqrt()
          .range([2, 15]);

var xAxis = d3.axisBottom()
        .scale(x);

var yAxis = d3.axisLeft()
          .scale(y);

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

svg.append('g')
    		.attr('transform', 'translate(0,0)')
    		.attr('class', 'y axis')
    		.call(yAxis);    
      
      x.domain(d3.extent(data, function(d) {return d[var_x]}));
      y.domain(d3.extent(data, function(d) {return d[var_y]}));
      r.domain(d3.extent(data, function(d) {return d[var_r]}));
   
      svg.selectAll(".dot").data(data).enter()
        .append("circle")
        .attr("class", "dot")
        .attr("cx", function(d) {return x(d[var_x]);})
        .attr("cy", function(d) {return y(d[var_y]);})
        .attr("r", function(d) { return r(d[var_r]);})
        .style("fill", function(d) { return color(d[var_c]);})
				.on("mouseenter", function(d){
        	d3.selectAll(".dot")
          	.filter(function(e){return d === e;})
            .style("stroke-width", 5);
        })
      	.on("mouseleave", function(d){
           d3.selectAll(".dot").style("stroke-width", .5);
      	});
    
      var legend = svg.selectAll(".legend")
        .data(color.domain())
        .enter().append("g")
        .attr("class", "legend")
        .attr("transform", function(d, i) { return "translate(0," + i * 22 + ")"; });

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; });
  }
    
 	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;
			});
    scatterplot(d3.select("#chart-left"), data, 400, 400, "sepal_length", "sepal_width",
                "species", "petal_length")
    scatterplot(d3.select("#chart-right"), data, 400, 400, "sepal_length", "petal_length",
               "species", "petal_length")
                          
 	});
    
  </script>
</body>

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