D3 Examples - D3 Block-a-Day: Day 20, January 20th, 2017

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<!DOCTYPE html>
<meta charset="utf-8">
<head>
    <title>D3 Block-a-Day: Day 16, January 16, 2017</title>
</head>
<!-- Example based on Michele Weigle's D3 Scatterplot Example https://bl.ocks.org/weiglemc/6185069 -->
​
<style>
    body {
      font: 16pt Avenir;
    }
​
    .axis path,
    .axis line {
         fill: none;
         stroke: #000;
         shape-rendering: crispEdges;
    }
​
    .dot {
        stroke: black;
    stroke-width: 2px;
    fill: #00c6c0;
    }
​
    .tooltip {
    background-color: #fedea3;
    padding: 7px;
    text-shadow: #f5f5f5 0 1px 0;
    font: 15px Avenir;
    border: 2px solid;
    border-color: black;
        border-radius: 5px;
    position: absolute;
    box-shadow: rgba(0, 0, 0, 0.3) 0 2px 10px;
  }
  
  .xaxis {
     font: 16px Avenir;
   }
  
  .xaxisLabel {
      text-anchor: left;
      font-family: Avenir;
  }
   .yaxis {
     font: 16px Avenir;
   }
   
  .yaxisLabel {
       text-anchor: middle;
       font-family: Avenir;  
  }
  
  .correlationLabel {
      text-anchor: left;
      font: 28px Avenir;
      fill: #ef9b00;
      stroke: black;
      stroke-width: 0.5px;
  }
​
  .titleLabel {
      text-anchor: middle;
      font: 30px Avenir;
      fill: black;
      stroke-width: 0.5px;
  }
   .ticks {
     font: 12px Avenir;
   }
​
   .track,
   .track-inset,
   .track-overlay {
     stroke-linecap: round;
   }
​
   .track {
     stroke: #000;
     stroke-opacity: 0.3;
     stroke-width: 10px;
   }
​
   .track-inset {
     stroke: #ddd;
     stroke-width: 8px;
   }
​
   .track-overlay {
     pointer-events: stroke;
     stroke-width: 50px;
     cursor: crosshair;
   }
​
   .handle {
     fill: #fff;
     stroke: #000;
     stroke-opacity: 0.5;
     stroke-width: 1.25px;
   }
​
</style>
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
​
<script>
var margin = {top: 60, right: 20, bottom: 100, left: 70},
    width = 960 - margin.left - margin.right,
    height = 600 - margin.top - margin.bottom;
​
/*
 * 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
 * axis - sets up axis
 */
​
// setup x
var xValue = function(d) { return d.winsPrev; }, // data -> value
    xScale = d3.scaleLinear().range([0, width]), // value -> display
    xMap = function(d) { return xScale(xValue(d));}, // data -> display
    xAxis = d3.axisBottom(xScale);
​
// setup y
var yValue = function(d) { return d.wins; }, // data -> value
    yScale = d3.scaleLinear().range([height, 0]), // value -> display
    yMap = function(d) { return yScale(yValue(d));}, // data -> display
    yAxis = d3.axisLeft(yScale);
​
// for slider
var x = d3.scaleLinear()
    .domain([2016, 1902])
    .range([0, width])
    .clamp(true);
  
// add the graph canvas to the body of the webpage
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 + ")");
​
// add the tooltip area to the webpage
var tooltip = d3.select("body").append("div")
    .attr("class", "tooltip")
    .style("opacity", 0);
  
// load data
d3.json("baseball_team_wins.json", function(error, data) {
            if (error) return console.warn(error);
​
  // don't want dots overlapping axis, so add in buffer to data domain
  xScale.domain([30, 120]);
  yScale.domain([30, 120]);
​
  var activeYear = 2016;
  
  // x-axis
  svg.append("g")
      .attr("class", "xaxis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  // x-axis label
  svg.append("text")
      .attr('class', 'xAxisLabel')
        .attr("transform",
            "translate(" + (width*0.1) + " ," +
                           (height + margin.top) + ")")
      .text("Wins " + (activeYear - 1));
  
  // y-axis
  svg.append("g")
      .attr("class", "yaxis")
      .call(yAxis);
​
  // y-axis label
  svg.append("text")
      .attr('class', 'yAxisLabel')
      .attr("transform", "rotate(-90)")
      .attr("y", 10 - margin.left)
        .attr("x", - 0.75*height)
      .attr("dy", ".71em")
      .text("Wins " + activeYear);
  
   var years = data.filter(y => {
       return y.year === activeYear || y.year === activeYear - 1;
   });
   var teams = years[0].teams;
   var correlation = years[0].correlation;
   teams.forEach((t, i) => {
       var sameTeamPrevYear = years[1].teams.filter(t2 => {
          return t2.name === t.name;
        });
        t.winsPrev = sameTeamPrevYear[0].wins;
    });
​
   // add in the slider
   var slider = svg.append("g")
    .attr("class", "slider")
    .attr("transform", "translate(" + 0 + "," + (height + margin.top + 20) + ")");
​
     var yearActual = 2016,
     yearTarget = 2016,
     yearTimer = d3.timer(yearTween);
  
   slider.append("line")
       .attr("class", "track")
       .attr("x1", x.range()[0])
       .attr("x2", x.range()[1])
     .select(function() { return        this.parentNode.appendChild(this.cloneNode(true)); })
       .attr("class", "track-inset")
       .select(function() { return this.parentNode.appendChild(this.cloneNode(true)); })
       .attr("class", "track-overlay")
       .call(d3.drag()
           .on("start.interrupt", function() { slider.interrupt(); })
           .on("start drag", function() { year(x.invert(d3.event.x)); }));  
  
   slider.insert("g", ".track-overlay")
     .attr("class", "ticks")
     .attr("transform", "translate(0," + 18 + ")")
     .selectAll("text")
     .data(x.ticks(10))
     .enter().append("text")
     .attr("x", x)
     .attr("text-anchor", "middle")
     .text(function(d) { return d; });
​
   var handle = slider.insert("circle", ".track-overlay")
     .attr("class", "handle")
     .attr("r", 9);
  
   function year(h) {
      yearTarget = h;
      yearTimer.restart(yearTween);
   }
​
   function yearTween() {
     yearActual = yearTarget;
     handle.attr("cx", x(yearActual));
     update(yearActual);
   }
​
    // draw dots
    svg.selectAll(".dot")
      .data(teams)
        .enter()
      .append("circle")
      .attr("class", "dot")
      .attr("r", 10)
      .attr("cx", xMap)
      .attr("cy", yMap)
      .on("mouseover", function(d) {
          tooltip.transition()
               .duration(75)
                    .style("opacity", .9);
          tooltip.html("<b>" + d.name + "</b>" + "<br/>" + (activeYear - 1) + ": " + xValue(d)
            + " Wins, " + activeYear + ": " + yValue(d) + " Wins")
               .style("left", (d3.event.pageX + 5) + "px")
               .style("top", (d3.event.pageY - 28) + "px");
      })
      .on("mouseout", function(d) {
          tooltip.transition()
               .duration(300)
               .style("opacity", 0);
      });
  
    svg.append("text")
      .attr('class', 'correlationLabel')
        .attr("transform",
            "translate(50, 70)")
      .text("Correlation = " + correlation);
  
    svg.append("text")
      .attr('class', 'titleLabel')
        .attr("transform",
            "translate(" + width/2 + ", -20)")
      .text("MLB Baseball Team Wins in Consecutive Years: " + (activeYear - 1) + " & " +  activeYear );
  
    function update(year) {
       var activeYear = Math.round(year);
       var years = data.filter(y => {
       return y.year === activeYear || y.year === activeYear - 1;
     });
     if(!years.length) return;
     var teams = years[0].teams;
     var correlation = years[0].correlation;
     teams.forEach((t, i) => {
       var sameTeamPrevYear = years[1].teams.filter(t2 => {
          return t2.name === t.name;
        });
        t.winsPrev = sameTeamPrevYear[0].wins;
     });
​
     // x-axis label
     d3.select('.xAxisLabel')
         .text("Wins " + (activeYear - 1));
​
     // y-axis label
     d3.select('.yAxisLabel')
          .text("Wins " + activeYear);  
​
    // correlation label
    d3.select('.correlationLabel')
      .text("Correlation = " + correlation)
​
    // title label
    d3.select(".titleLabel")
          .text("MLB Baseball Team Wins in Consecutive Years: " + (activeYear - 1) + " & " +  activeYear );
      
    // Scatterplot
      svg.selectAll(".dot")
         .data(teams)
         .attr("cx", xMap)
         .attr("cy", yMap)
         .on("mouseover", function(d) {
          tooltip.transition()
               .duration(75)
                    .style("opacity", .9);
          tooltip.html("<b>" + d.name + "</b>" + "<br/>" + (activeYear - 1) + ": " + xValue(d)
            + " Wins, " + activeYear + ": " + yValue(d) + " Wins")
               .style("left", (d3.event.pageX + 5) + "px")
               .style("top", (d3.event.pageY - 28) + "px");
          })
          .on("mouseout", function(d) {
              tooltip.transition()
               .duration(300)
               .style("opacity", 0);
          });
    } //END update
});
​
</script>
</body>
​
    