S18 - HW 3 - Bar Chart

CS 725/825 - Spring 2018 - Homework 3 - Bar Chart
Kavyashree Sirigere Prakash

BAR CHART

What is the type of mark used in the bar chart?
Line is the mark type used in the Bar Chart.

List the channels, the attribute they are mapped to, and the data type of that attribute.
Channels are:
- Vertical spatial position channel
- Horizontal spatial position channel
  (Using Length to get position)
Attributes are :
- Frequency of Alphabets is quantitative data plotted in vertical spatial position channel.
- Alphabets are categorical data which is plotted in horizontal spatial position channel.
After your changes, list the channels, the attribute they are mapped to, and the data type of that attribute.
Chart 1
Channels are:
- Vertical spatial position channel mapped to frequency of alphabet which is quantitative type attribute
- Horizontal spatial position channel mapped to alphabet(letter) which is categorical type attribute
- Hue mapped to the alphabet(letter) which is categorical type attribute
Chart 2
Channels are:
- Vertical spatial position channel mapped to frequency of alphabet which is quantitative type attribute
- Horizontal spatial position channel mapped to alphabet(letter) which is categorical type attribute
- Saturation mapped to the frequency of alphabet(letter) which is quantitative type attribute

References

https://stackoverflow.com/questions/42149691/how-can-i-use-d3-scale-chromatic-functions-with-a-domain-other-than-0-1
https://github.com/d3/d3-scale#band_domain
http://d3-legend.susielu.com/#size-linear

<!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>

<body>
	<p>Frequency of usage of letters in English</p>
	<h2>Bar Chart 1</h2>
  
  <div><svg id="chart1" width="800" height="400"></svg></div>
  <div><svg id="legend1" width="800" hegiht="50"></svg></div>
	<h2>Bar Chart 2</h2>
  <div><svg id="chart2" width="800" height="400"></svg></div>
  <div><svg id="legend2" width="800" hegiht="50"></svg></div>
<div>
  
 
 </div>
<script>
// chart 1

var svg1 = d3.select("#chart1"), 
    margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = +svg1.attr("width") - margin.left - margin.right,
    height = +svg1.attr("height") - margin.top - margin.bottom;

// See https://github.com/d3/d3-scale
var x1 = d3.scaleBand().rangeRound([0, width]).padding(0.1),
    y1 = d3.scaleLinear().rangeRound([height, 0]); // note that we've reversed the range

// creates new svg <g> space, sets new (0,0) at left, top margin
var g1 = svg1.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.tsv("data.tsv", function(d) {
  d.frequency = +d.frequency;    // convert text to number
  return d;
}, function(error, data) {
  if (error) throw error;

// See https://www.dashingd3js.com/d3js-scales
  // maps domain of x values (letters) to range of positions on x-axis
  x1.domain(data.map(function(d) { return d.letter; }));  
  // maps domain of y values (frequencies 0, max freq) to range of positions on y-axis
  y1.domain([0, d3.max(data, function(d) { return d.frequency; })]);

// x-axis
  g1.append("g")
    .attr("class", "axis x-axis")
    .attr("transform", "translate(0," + height + ")") // move axis to bottom of chart
    .call(d3.axisBottom(x1));
  
  // y-axis
  g1.append("g")
    .attr("class", "axis y-axis")
    .call(d3.axisLeft(y1).ticks(10, "#")); // number of ticks and type

// y-axis label
  g1.append("text")
  	.attr("class", "label")
    .attr("x", 0-margin.left)       // set x position of label
    .attr("y", 0-margin.top/2)			// set y position of label
    .style("text-anchor", "start")  // left-justify
  	.text ("Frequency")
  
  // bars
  //https://github.com/d3/d3-scale#ordinal-scales
  //var huecolor = d3.scaleOrdinal(d3.schemeCategory20)
 //.range(["#31a2be","#7f1f00","#6baed6","#cc3399","#9ecae1","#e6550d","#fd8d3c","#fdd0a2","#31a354","#cc6600","#d9d9d9","#a1d99b","#dc42f4","#f441a0","#804000","#9741f4","#5541f4","#ffffcc","#99ff99","#99cc00","	#1b00cc","#7cff51","#cc0033","#cc00cc","#00cc99"]);
  //var huecolor = d3.scale.category20c();
  var huecolor = d3.scaleSequential(d3.interpolateRainbow)
  .domain([0, 26]);
 // var  huecolor= d3.scaleSequential(d3.interpolatePRGn)
  //.domain([-5 ,27]);
 
 
  g1.selectAll(".bar")
    .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { console.log ("letter: " + d.letter + ", x: " + x1(d.letter)); return x1(d.letter); })
      .attr("y", function(d) { console.log ("freq: " + d.frequency + ", y: " + y1(d.frequency)); return y1(d.frequency); })
      .attr("width", x1.bandwidth()) // width of each band 
      .attr("height", function(d) { return height - y1(d.frequency); })
  		.style("fill", function(d,i){return huecolor(i)})  // color of the bars
  ;
});
var legend1 = svg1.selectAll(".legend1")
    .data(data)
    .enter().append("g")
    .attr("class", "legend1")
    .attr("transform", function(d, i) { return "translate(65," + i * 15 + ")"; });
  
  
 </script>
 
  
<script>  
// chart 2  
var svg2 = d3.select("#chart2"),
    margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = +svg2.attr("width") - margin.left - margin.right,
    height = +svg2.attr("height") - margin.top - margin.bottom;

var x2 = d3.scaleBand().rangeRound([0, width]).padding(0.1),
    y2 = d3.scaleLinear().rangeRound([height, 0]);

var g2 = svg2.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.tsv("data.tsv", function(d) {
  d.frequency = +d.frequency; 
  return d;
}, function(error, data) {
  if (error) throw error;

x2.domain(data.map(function(d) { return d.letter; }));
  y2.domain([0, d3.max(data, function(d) { return d.frequency; })]); 
//var saturationcolor=d3.
  // x-axis
  g2.append("g")
    .attr("class", "axis axis--x")
    .attr("transform", "translate(0," + height + ")") 
    .call(d3.axisBottom(x2));

// y-axis
  g2.append("g")
    .attr("class", "axis axis--y")
    .call(d3.axisLeft(y2).ticks(10, "#"));

// y-axis label
  g2.append("text")
  	.attr("class", "label")
    .attr("x", 0-margin.left)
    .attr("y", 0-margin.top/2)
    .style("text-anchor", "begin")
  	.text ("Frequency")
  
  // bars
  //var Saturationcolor = d3.scaleSequential(d3.interpolateBlues).domain([height, 0]);

g2.selectAll(".bar")
    .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x2(d.letter); })
      .attr("y", function(d) { return y2(d.frequency); })
      .attr("width", x2.bandwidth())
      .attr("height", function(d) { return height - y2(d.frequency); })
  		.style("fill",function(d) {return d3.interpolateGreens(d.frequency * 10.5);})  // color of the bars
  ;
});
  
 var yfrequency=[0.01,0.02,0.03,0.04,0.05,0.06,0.07,0.08,0.09,0.1,0.11,0.12];
  
  
</script>
</body>
</html>

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

https://d3js.org/d3-scale-chromatic.v1.min.js