D3 Examples - S18 - HW3

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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script> <!-- for color scales -->
  
<!-- Example based on https://bl.ocks.org/mbostock/3887118 -->
<!-- Tooltip example from https://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html -->
​
<style>
  body { font-family: calibri; }
  .axis { font: 14px calibri; }
  .label {font: 16px calibri; }
​
.tooltip {
  position: absolute;
  width: 150px;
  height: 60px;
  background: #f2f2f2;
  pointer-events: none;
}
</style>
  
<body>
  <h2>Scatterplot</h2>
  <!-- // Modified by dralph -->
  <div><svg id="chart1" width="800" height="400"></svg></div>
​
<script>
// add the graph canvas to the body of the webpage
// Modifed by dralph
var svg = d3.select("#chart1"), 
    margin = {top: 20, right: 90, bottom: 50, left: 70},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;
​
var g = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
// add the tooltip area to the webpage
var tooltip = d3.select("body").append("div")
    .attr("class", "tooltip")
    .style("opacity", 0);
  
// Added by dralph
var confs = [ 'Big 12', 'CUSA', 'SEC', 'Big Ten', 'ACC', 'Pac-12', 'American', 'Ind', 'Sun Belt', 'MAC', 'MWC' ];
  
var colorScale = d3.scaleOrdinal()
.domain(confs)
.range([ 'tan', 'blue', 'crimson', 'silver', 'green', 'navy', 'red', 'gold', 'yellow', 'black', 'gray' ])
// End dralph
​
// load data
// Modified by dralph - added interceptions
d3.csv("passing-stats-2014.csv", function (d) {
  // change string (from CSV) into number format
  d["Passing TD"] = +d["Passing TD"];
  d["Rushing TD"] = +d["Rushing TD"];
  d["Interceptions"] = +d["Interceptions"]
  return d;
}, function(error, data) {
​
    if (error) throw error;
  
/* 
 * value accessor - returns the value to encode for a given data object.
 * scale - maps value to a visual display encoding, such as a pixel position.
 * map function - maps from data value to display value
 */ 
  
// Added by dralph
// Get the color for the dot based on the conference
  function getcolor(i)
  {
    var color = colorScale(i["Conf"]);
    return color;
  }
// Size the dot by Interceptions
  function getsize(i)
  {
        var size = 3.5+(i["Interceptions"]*0.4);
    return size;
  }  
// End dralph
  
// setup x 
var xValue = function(d) { return d["Rushing TD"];}, // data -> value
    xScale = d3.scaleLinear().range([0, width]),     // value -> display
    xMap = function(d) { return xScale(xValue(d));}; // data -> display
  
​
// setup y
var yValue = function(d) { return d["Passing TD"];}, // data -> value
    yScale = d3.scaleLinear().range([height, 0]),    // value -> display
    yMap = function(d) { return yScale(yValue(d));}; // data -> display
​
  // don't want dots overlapping axis, so add in buffer to data domain
  xScale.domain([d3.min(data, xValue)-1, d3.max(data, xValue)+1]);
  yScale.domain([0, d3.max(data, yValue)+1]);
​
  // x-axis
  g.append("g")
        .attr("class", "axis x-axis")
    .attr("transform", "translate(0," + height + ")") // move axis to bottom of chart
    .call(d3.axisBottom(xScale));
  
  // x-axis label
  g.append("text")
    .attr("class", "label")
    .attr("x", width/2)
    .attr("y", height+(margin.bottom*0.75))
    .style("text-anchor", "middle")
    .text("Rushing TDs");
​
  // y-axis
  g.append("g")
        .attr("class", "axis y-axis")
        .call(d3.axisLeft(yScale));
  
  // y-axis label
  g.append("text") 
    .attr("class", "label")
    .attr("x", 0-(height/2))
    .attr("y", 0-(margin.left*0.55))
    .attr("transform", "rotate(-90)") // rotate text -90 degrees from x, y
    .style("text-anchor", "middle")
    .text("Passing TDs");
​
  // draw dots
  // Modified by dralph
  g.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", getsize)
      .attr("cx", xMap)
      .attr("cy", yMap)
      .style("fill", getcolor )
​
      // tooltip
      .on("mouseover", function(d) {
          tooltip.transition()
               .duration(200)         // ms delay before appearing
               .style("opacity", .8); // tooltip appears on mouseover
          tooltip.html(d["Player"] + "<br/> " + d.School + "<br/>(" + xValue(d) 
            + ", " + yValue(d) + ")")
               .style("left", (d3.event.pageX + 10) + "px")  // specify x location
               .style("top", (d3.event.pageY - 28) + "px");  // specify y location
      })
      .on("mouseout", function(d) {
          tooltip.transition()
               .duration(500)
               .style("opacity", 0); // disappear on mouseout
      });
​
  // BEGIN LEGEND CODE  
  // Legend taken from https://bl.ocks.org/weiglemc/6185069
​
  // draw dots
  g.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", getsize )
      .attr("cx", xMap)
      .attr("cy", yMap)
      .style("fill", getcolor )
  
  // draw legend
  var legend = svg.selectAll(".legend")
      .data(colorScale.domain())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(153," + i * 19 + ")"; });
​
  // draw legend colored rectangles
  legend.append("rect")
      .attr("x", width - 18)
      .attr("width", 18)
      .attr("height", 18)
      .style("fill", colorScale);
​
  // draw legend text
  legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".35em")
      .style("text-anchor", "end")
      .text(function(d) { return d;})  
​
});
​
</script>
</body>
</html>
    