D3 Examples - Texas death penalty

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
h1 {
font: 40px Helvetica;
color: #FFF200;
​
}
​
h2 {
font: 25px Helvetica;
color: #FFF200;
​
}
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h3 {
font: 20px Helvetica;
color: white;
​
}
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body {
  font: 8px Helvetica, white;
  background: black;
  color: white;
}
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.axis path,
.axis line {
  fill: none;
  stroke: none;
  shape-rendering: crispEdges;
}
​
.axis text {
fill: white;
​
}
​
.dot {
  stroke: none;
}
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.tooltip {
  position: absolute;
  color: white;
  width: 100px;
  height: 10px;
  pointer-events: none;
}
​
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js" charset="utf-8"></script>
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<h1>Seeing Humans, Not Only Convicts!</h1>
<h2>Last Statements of Texas Death Penalty Prisoners and What It Reveals:<h2>
  <h3>...They mentioned <strong><font color="#17becf">"God"</font></strong>, <strong><font color="#d62728">"Love"</font></strong>, <strong><font color="#7f7f7f">"Didn’t mean to hurt"</font></strong>, and even <strong><font color="#8c564b">"I didn't kill"</font></strong></h3>
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#8c564b
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<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
​
var dateFormat = d3.time.format("%Y");
​
​
var xScale = d3.time.scale()
    .range([0, width]);
​
// d3.time.scale()
//                 .range([ padding[3], w - padding[1] - padding[3] ]);
​
​
var yScale = d3.scale.linear()
    .range([height, 0]);
​
​
​
var color = d3.scale.category10();
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var xAxis = d3.svg.axis()
              .scale(xScale)
              .orient("bottom")
              .ticks(30)
              .tickFormat(function(d) {
                return dateFormat(d);
              });
​
var yAxis = d3.svg.axis()
    .scale(yScale)
    .orient("left");
​
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 tooltip = d3.select("body")
    .append("div")
    .attr("class", "tooltip")
    .style("opacity", 0);
​
d3.csv("data3.csv", function(error, data) {
  data.forEach(function(d) {
    // d.years = +d.years;
    d.count = +d.count;
  });
​
  xScale.domain([ 
          d3.min(data, function(d) {
            return dateFormat.parse(d.years);
          }),
          d3.max(data, function(d) {
            return dateFormat.parse(d.years);
          })
        ]);
​
  // xScale.domain(d3.extent(data, function(d) { return d.sepalWidth; })).nice();
​
  // yScale.domain([ 
  //         d3.max(data, function(d) {
  //           return +d.count;
  //         }),
  //         0
  //       ]);
​
   yScale.domain(d3.extent(data, function(d) { return d.count; })).nice();
​
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .append("text")
      .attr("class", "label")
      .attr("x", width - width + 40)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Years");
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-30)")
      .attr("y", 200)
      .attr("x", 200)
      .style("font-size", 20)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Number of Executions in Texas")
​
  svg.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", function(d) { return d.Age * 0.1 })
      .attr("cx", function(d) {
            return xScale(dateFormat.parse(d.years)); })
      .attr("cy", function(d) {
            return yScale(d.count);})
      .style("fill", function(d) { return color(d.Keywords) ;})
      .on("mouseover", function(d) {
            d3.select(this).transition().duration(600)
            .attr("r", 250)
            .style("fill", "black")
            .style("opacity", .7);
​
              tooltip.transition()
                   .duration(500)
                   .style("opacity", .9);
              tooltip.html(d.Statement)
                   .style("left", (d3.event.pageX + 5) + "px")
                   .style("top", (d3.event.pageY - 28) + "px");
          })
          .on("mouseout", function(d) {
​
              d3.select(this).transition().duration(100).attr("r", function(d) { return d.Age * 0.1 })
              .style("fill", function(d) { return color(d.Keywords) ;})
              .style("opacity", valOpacity); 
​
              tooltip.transition()
                   .duration(100)
                   .style("opacity", 0);
             tooltip.html(d.Statement)
                   .style("left", (d3.event.pageX + 5) + "px")
                   .style("top", (d3.event.pageY - 28) + "px");
          });
​
​
  var legend = svg.selectAll(".legend")
      .data(color.domain())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
​
  legend.append("rect")
      .attr("x", width - 10)
      .attr("width", 18)
      .attr("height", 18)
      .style("fill", color);
​
  legend.append("text")
      .attr("x", width - 20)
      .attr("y", 9)
      .attr("dy", ".35em")
      .style("fill", color)
      .style("text-anchor", "end")
      .text(function(d) { return d; });
​
});
​
</script>
    