Assignment 4 Bar

<!DOCTYPE html>
<meta charset="utf-8">
<!--

used this as starting point: https://blockbuilder.org/elt12njo/76b484f5187c7ecfc83070dd81897327

-->  
<body>

<script src="https://d3js.org/d3.v4.min.js"></script>

<script>

// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 110, left: 100},
    width = 7000 - margin.left - margin.right,
    height = 7000 - margin.top - margin.bottom;

// set the ranges
var xscale = d3.scaleBand()
          .range([0, width])
          .padding(.1);

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

// append the svg object to the body of the page
// append a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");

// get the data
//change to billionaires.csv for full set of data
d3.csv("billionaires.csv", function(error, dataset) {
  if (error) throw error;

// format the data
  dataset.forEach(function(d) {
    d.name = d.name;
    d[ 'worth in billions' ] = +d[ 'worth in billions' ];
    
  });
  
// Scale the range of the data in the ; 2614 = number of records
  xscale.domain(dataset.map(function(d) {return d.name;}));
  yscale.domain([0, d3.max(dataset, function(d) { return d[ 'worth in billions' ]; })]);

// append the rectangles for the bar chart
  svg.selectAll(".bar")
      .data(dataset)
      .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return xscale(d.name) })
      .attr("width", width / dataset.length )                 //+5 for padding
      .attr("y", function(d) { return yscale(d[ 'worth in billions' ]); })
      .attr("height", function(d) { return height - yscale(d[ 'worth in billions' ]); });

// add the x Axis
  svg.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(xscale))
     .selectAll("text") 
     .style("text-anchor", "end")
        .attr("dx", ".8em")
    .style("font-size", "10px") 
        .attr("dy", ".75em")
           .attr("transform",  "rotate(-35)");

//label x axis, moving it 'down' to make it visible
  svg.append("text")             
      .attr("transform",
            "translate(" + (width/2) + " ," + 
                           (height + margin.top *4) + ")")
      .style("text-anchor", "middle")
      .style("font-size", "30px")
      .text("NAME OF BILLIONAIRE");
  // add the y Axis
  svg.append("g")
      .call(d3.axisLeft(yscale))
      .selectAll("text")
      .style("font-size", 50)

//label y axis, moving it 'left' to make it visible
  // text label for the y axis
  svg.append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 0 - margin.left)
      .attr("x",0 - (height / 2))
      .attr("dy", "1em")
      .style("text-anchor", "middle")
      .style("font-size", "30px")
        .attr("transform", "rotate(-90)")
      .text("Worth in billions");

//show every 3rd tick mark, to clean up x-axis if the dataset is huge
    var ticks = d3.selectAll(".tick text");
    ticks.attr("class", function(d,i){
      if(dataset.length > 100)
      {
        if(i%3 != 0) d3.select(this).remove();
      }  
      });
      
  });

</script>

</script>
</body>

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