D3 Examples - 7.8 animated scatter plot

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
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<!-- Google fonts reference-->
<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">
​
<!-- Connecting with D3 library-->
<script src="https://d3js.org/d3.v4.min.js"></script>
​
<!-- Creating the headlines -->
<p id="h1">SCATTER PLOT | UPDATE</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>
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<!-- Create the starting button -->
<button id="start" style="position: absolute; margin-left:20px; margin-top:50px;">START</button>
​
<style>
​
/*Defining text stylings*/
​
#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}
​
#link {
    font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
    margin:5px 0px 0px 22px;
  color:white;
}
​
a:link, a:visited, a:active {
    text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}
​
body {
  background-color:#011227;
}
​
/*Defining button stylings*/
​
#start, #reset {
  font-family:'Montserrat Alternates', sans-serif;
  font-size:12px;
  color:WHITE;
  border:0;
  line-height:1;
  text-align:center;
  background-color:#011227;
}
​
#start:hover, #reset:hover {
  color:#f5fa91;
  background-color:NONE;
}
​
/*Defining axis stylings*/
​
.y-axis text, .x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:10px;
  opacity:1;
  fill:white;
}
​
.y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
​
.x-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
​
.y-axis line, .x-axis line {
  fill:none;
  stroke-width:0.5;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
}
​
/*Defining chart stylings*/
​
circle {
  opacity:0.8;
}
​
</style>
​
<script>
​
//Margin conventions
var m = {top:100, right:50, bottom:50, left:50}
    w = 600 - m.left - m.right,
    h = 600 - m.top - m.bottom;
​
//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
    .attr("transform", `translate(${m.left}, ${m.top})`);
​
//Dynamic, random dataset
var data = [];
var numDataPoints = 50;
var maxRange = Math.random() * 1000;
    for (var i = 0; i < numDataPoints; i++) {
    var newNumber1 = Math.floor(Math.random()*maxRange);
    var newNumber2 = Math.floor(Math.random()*maxRange);
data.push([newNumber1, newNumber2]);}
​
//X scale
var x = d3.scaleLinear()
        .domain([0, d3.max(data, d => d[0])])
        .range([0, w]);
​
//Y scale
var y = d3.scaleLinear()
        .domain([0, d3.max(data, d => d[1])])
        .range([h, 0]);
​
//r scale
var r = d3.scaleLinear()
        .domain([0, d3.max(data, d => d[0])])
        .range([5, 25]);
​
//Color Scale
var c = d3.scaleOrdinal()
    .range(["#f5fa91", "#8ff798", "#85f6fa"]);
​
//Draw the circles
svg.selectAll("circle")
     .data(data)
     .enter()
     .append("circle")
     .attr("cx", d => x(d[0]))
     .attr("cy", d => y(d[1]))
     .attr("r", d => r(d[0]))
   .attr("fill", d => c(d[0]))
​
//Call x axis
svg.append("g")
     .attr("class", "x-axis")
     .attr("transform", `translate(0, ${h})`)
     .call(d3.axisBottom()
                     .scale(x)
                     .ticks(3)
           .tickPadding(10)
           .tickSize(-h));
​
//Call y axis
svg.append("g")
     .attr("class", "y-axis")
     .attr("transform", `translate(0, 0)`)
     .call(d3.axisLeft()
                     .scale(y)
                     .ticks(3)
           .tickPadding(10)
           .tickSize(-w));
​
//On click, update with new data
d3.select("#start")
  .on("click", function() {
​
//New dataset
var numValues = data.length;
var maxRange = Math.random() * 1000;
data = [];
        for (var i = 0; i < numValues; i++) {
        var newNumber1 = Math.floor(Math.random()*maxRange);
        var newNumber2 = Math.floor(Math.random()*maxRange);
data.push([newNumber1, newNumber2]);
                    }
//New scale domain
x.domain([0, d3.max(data, d => d[0])]);
y.domain([0, d3.max(data, d => d[1])]);
r.domain([0, d3.max(data, d => d[0])]);
​
//Redrawing the circles
svg.selectAll("circle")
     .data(data)
     .transition()
     .duration(1000)
     .attr("cx", d => x(d[0]))
     .attr("cy", d => y(d[1]))
     .attr("r", d => r(d[0]))
   .attr("fill", d => c(d[0]))
​
//Transition of the x axis
svg.select(".x-axis")
     .transition()
     .duration(2000)
     .call(d3.axisBottom()
                     .scale(x)
                     .ticks(3)
           .tickSize(-h));
​
//Transition of the y axis
svg.select(".y-axis")
     .transition()
     .duration(2000)
     .call(d3.axisLeft()
                     .scale(y)
                     .ticks(3)
           .tickSize(-w));
});
​
</script>
</body>
</html>
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