d3_script_pt2.js

//Sets plot's dimensions and other relevant values as paddings
//and margins
var w = 1000
var h = 1250

var xPadding = 10
var yPadding = 20

var xMargin = 200
var yMargin = 0

var rectMargin = 5

//Caculates the scales used for x, y and yAxis
function calculateScales(dataSet) {
  var xScale = d3.scale.linear()
                       .domain([0, 246000])
                      .range([xPadding, w - xMargin - xPadding])

//This scale ensures that the rectangles will be placed in
//the right spot along the y axis
  var yScale = d3.scale.ordinal()
                       .domain(d3.range(dataSet.length))
                       .rangeRoundBands([0, (h - 1.2 * yPadding )], 0.05)

//This is an special scale for the yaxis which uses ordinal
//values corresponding to the name of the universities
  var yAxisScale = d3.scale.ordinal()
                            .domain(dataSet.map(function (d) {
                              return d.university
                            }))
                            .rangeRoundBands([0, (h - 1.2 * yPadding )], 0.05)

  return [xScale, yScale, yAxisScale]
}

//Calculates the plot axes using the previously defined scale
//values
function calculateAxes(xScale, yAxisScale) {
  var xAxis = d3.svg.axis()
                  .scale(xScale)
                  .orient("bottom")
                  .ticks(5)

  var yAxis = d3.svg.axis()
                  .scale(yAxisScale)
                  .orient("left")

  return [xAxis, yAxis]
}