Interactive-Viz-D3-JS/histogram.html at main · IsaacMwendwa/Interactive-Viz-D3-JS · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
<!DOCTYPE html>
<meta charset="utf-8">
<html lang="en">
<head>
    <title>Visualization Programming Using D3.js</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>

    <!-- Load d3.js -->
    <script src="https://d3js.org/d3.v4.js"></script>


    <style>
        /* Remove the navbar's default margin-bottom and rounded borders */
        .navbar {
            margin-bottom: 0;
            border-radius: 0;
        }

        /* Set height of the grid so .sidenav can be 100% (adjust as needed) */
        .row.content {height: 450px}

        /* Set gray background color and 100% height */
        .sidenav {
            padding-top: 20px;
            background-color: #f1f1f1;
            height: 100%;
        }

        /* Set black background color, white text and some padding */
        footer {
            background-color: #555;
            color: white;
            padding: 15px;
        }

        /* On small screens, set height to 'auto' for sidenav and grid */
        @media screen and (max-width: 767px) {
            .sidenav {
            height: auto;
            padding: 15px;
            }
            .row.content {height:auto;}
        }
    </style>
</head>
<body>

<nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Visualization Programming using D3.js</a>
    </div>
    <div class="collapse navbar-collapse" id="myNavbar">
    </div>
  </div>
</nav>

<div class="container-fluid text-center">
  <div class="row content">
    <div class="col-sm-2 sidenav">
      <p><b>Background Information</b></p>
        <p>Dataset used: <a href="https://github.com/IsaacMwendwa/dataViz">a1-cereals.csv</a></p>
      <p>The histogram in this page allows for interactivity, by having functionality for
      the user to change the number of bins in the histogram</p>
      <p>This also allows the user to have a closer inspection and hence finding meaningful insights/patterns from the dataset</p>
    </div>

    <div class="col-sm-8 text-left">
      <h1>Visualization Programming using D3.js: Histogram</h1>

      <!--div where the graph will take place -->
      <div id="my_dataviz">
          <script>

            // set the dimensions and margins of the graph
            var margin = {top: 10, right: 30, bottom: 30, left: 40},
                width = 460 - margin.left - margin.right,
                height = 400 - margin.top - margin.bottom;

            // append the svg object to the body of the page
            var svg = d3.select("#my_dataviz")
              .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
            d3.csv("https://raw.githubusercontent.com/IsaacMwendwa/dataViz/main/a1-cereals.csv", function(data) {

                // Defining graph title and axis labels
                const xAxisLabel = "Calories";
                const yAxisLabel = "Frequency";
                const title = `Histogram of ${xAxisLabel} present in Various Cereals`;

                // X axis: scale and draw:
                var x = d3.scaleLinear()
                    .domain([0, 200])
                    .range([0, width]);
                svg.append("g")
                    .attr("transform", "translate(0," + height + ")")
                    .call(d3.axisBottom(x));

                // Y axis: initialization
                var y = d3.scaleLinear()
                    .range([height, 0]);
                var yAxis = svg.append("g")


                //Create Title
                svg.append("text")
                    .attr("x", width / 2 )
                    .attr("y", 0)
                    .style("text-anchor", "middle")
                    .text(title);

                //Create X axis label
                svg.append("text")
                    .attr("x", width / 2 )
                    .attr("y",  height + margin.bottom)
                    .style("text-anchor", "middle")
                    .text(xAxisLabel);

                //Create Y axis label
                svg.append("text")
                    .attr("transform", "rotate(-90)")
                    .attr("y", 0-margin.left)
                    .attr("x",0 - (height / 2))
                    .attr("dy", "1em")
                    .style("text-anchor", "middle")
                    .text(yAxisLabel);


                // A function that builds the graph for a specific value of bin
                function update(nBin) {

                // set the parameters for the histogram
                var histogram = d3.histogram()
                    .value(function(d) { return d.Calories; })   // I need to give the vector of value
                    .domain(x.domain())  // then the domain of the graphic
                    .thresholds(x.ticks(nBin)); // then the numbers of bins

                // And apply this function to data to get the bins
                var bins = histogram(data);

                // Y axis: update now that we know the domain
                y.domain([0, d3.max(bins, function(d) { return d.length; })]);   // d3.hist has to be called before the Y axis obviously
                yAxis
                    .transition()
                    .duration(1000)
                    .call(d3.axisLeft(y));

                // Join the rect with the bins data
                var u = svg.selectAll("rect")
                    .data(bins)

                // Manage the existing bars and eventually the new ones:
                u
                    .enter()
                    .append("rect") // Add a new rect for each new elements
                    .merge(u) // get the already existing elements as well
                    .transition() // and apply changes to all of them
                    .duration(1000)
                        .attr("x", 1)
                        .attr("transform", function(d) { return "translate(" + x(d.x0) + "," + y(d.length) + ")"; })
                        .attr("width", function(d) { return x(d.x1) - x(d.x0) -1 ; })
                        .attr("height", function(d) { return height - y(d.length); })
                        .style("fill", "#69b3a2")


                // If less bar in the new histogram, I delete the ones not in use anymore
                u
                    .exit()
                    .remove()

                }


                // Initialize with 20 bins
                update(20)


                // Listen to the button -> update if user change it
                d3.select("#nBin").on("input", function() {
                update(+this.value);
                });

            });
          </script>

          <p>
            <label>Change Number of Bins</label>
            <input type="number" min="20" max="100" step="10" value="20" id="nBin">
          </p>

    </div>

    <div class="col-sm-8 text-left">
        <h3>Description of Findings</h3>
        <p>The result of plotting a histogram of calories present in various cereals in the given dataset is that
        most cereals have their calories count between 90 and 130; as depicted by the high frequencies of the corresponding bins</p>
        <p>When we increase the number of bins from 20 to 50, we find that a large number of cereals have their calories count at around 110 </p>
    </div>
    </div>
    <div class="col-sm-2 sidenav">
      <div class="well">
        <p><b>Visualizations used</b></p>
        <p><a href=index.html>Bubble Plot</a></p>
        <p><a href=scatter_plot.html>Scatter Plot</a></p>
        <p><a href=#>Histogram</a></p>
        <p><a href=heatmap.html>Heatmap</a></p>
        <p><a href=density_plot.html>Density Plot</a></p>
      </div>
      <div class="well">
        <p><b>Interactivity</b></p>
        <p>The visualizations provide various forms of interactivity to the user, including
        tooltips by hovering the mouse over a cell, adjusting X-axis limits, changing bins/categories to visualize </p>
      </div>
    </div>
  </div>
</div>

<footer class="container-fluid text-center">
  <p>Visualization Programming using D3.js</p>
</footer>
</body>
</html>