Baseball Scatterplot

Baseball statistics from 1986.

Bubble radius scaled to home runs. Data from the R package Visualizing Categorical Data.

<!DOCTYPE html>
<meta charset="utf-8">
<style type="text/css">
body {
  margin: 0;
  font-family: arial, sans;
}

.label {
  font-size: 15px;
}

.legend{
  opacity: 1;
  transition: opacity 0.3s;
}

.legend text,
.axis text {
  font-size: 13px;
  fill: #333;
}

.axis path,
.axis line {
  fill: none;
  stroke-width:1px;
  stroke: #e7e7e7;
}

circle {
  stroke: #fff;
}

.bubble {
  opacity: 1;
  transition: opacity 0.3s;
}

.bubble text {
  opacity: 0;
  pointer-events: none;
  font-size: 12px;
}

.bubble:hover text {
  opacity: 1;
}

.bubble:hover circle {
  fill-opacity: 1;
}

</style>
<body>
</body>

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 xscale = d3.scaleLinear()
  .domain([0,800])
  .range([0,width]);

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

var radius = d3.scaleSqrt()
  .range([2,8]);

var xAxis = d3.axisBottom()
  .tickSize(-height)
  .scale(xscale);

var yAxis = d3.axisLeft()
  .tickSize(-width)
  .scale(yscale)

var color = d3.scaleCategory20();

d3.csv("Baseball.csv", function(error, data) {
  console.log(data);
  // data pre-processing
  data.forEach(function(d) {
    d.y = +d["runs86"];
    d.x = +d["atbat86"];
    d.r = +d["homer86"];
  });

data.sort(function(a,b) { return b.r - a.r; });

yscale.domain(d3.extent(data, function(d) {
    return d.y;
  })).nice();

radius.domain(d3.extent(data, function(d) {
    return d.r;
  })).nice();

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

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

var group = svg.selectAll("g.bubble")
    .data(data)
    .enter().append("g")
    .attr("class", "bubble")
    .attr("transform", function(d) {
      return "translate(" + xscale(d.x) + "," + yscale(d.y) + ")"
    });

group
    .append("circle")
    .attr("r", function(d) { return radius(d.r);  })
    .style("fill", function(d) {
      return color(d["team86"]);
    })

group
    .append("text")
    .attr("x", function(d) { return radius(d.r); })
    .attr("alignment-baseline", "middle")
    .text(function(d) {
      return d["name1"] + " " + d["name2"];  
    });

svg.append("text")
    .attr("x", 6)
    .attr("y", -2)
    .attr("class", "label")
    .text("Runs (86)");

svg.append("text")
    .attr("x", width-2)
    .attr("y", height-6)
    .attr("text-anchor", "end")
    .attr("class", "label")
    .text("At Bats (86)");

var legend = svg.selectAll(".legend")
      .data(color.domain())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(2," + i * 14 + ")"; });

legend.append("rect")
      .attr("x", width)
      .attr("width", 12)
      .attr("height", 12)
      .style("fill", color);

legend.append("text")
      .attr("x", width + 16)
      .attr("y", 6)
      .attr("dy", ".35em")
      .style("text-anchor", "start")
      .text(function(d) { return d; });

legend.on("mouseover", function(type) {
      d3.selectAll(".legend")
        .style("opacity", 0.1);
      d3.select(this)
        .style("opacity", 1);
      d3.selectAll(".bubble")
        .style("opacity", 0.1)
        .filter(function(d) { return d["team86"] == type; })
        .style("opacity", 1);
    })
    .on("mouseout", function(type) {
      d3.selectAll(".legend")
        .style("opacity", 1);
      d3.selectAll(".bubble")
        .style("opacity", 1);
    });
});
</script>

https://d3js.org/d3.v4.0.0-alpha.35.min.js