D3 Examples - 4.8 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">
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<!-- Connecting with D3 library-->
<script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>
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<style>
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/*Defining text stylings*/
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#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}
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#link {
    font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
    margin:5px 0px 0px 22px;
  color:white;
}
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a:link, a:visited, a:active {
    text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}
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body {
  background-color:#011227;
}
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/*Defining axes stylings*/
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.y-axis text, .x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:10px;
  opacity:1;
  fill:white;
}
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.x-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
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.y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
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.x-axis line, .y-axis line {
  fill:none;
  stroke-width:0.1;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
}
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/*Defining chart stylings*/
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circle {
  fill-opacity:0.5;
  stroke-width:0.5;
  stroke-opacity:1;
}
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</style>
</head>
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<body>
  
<!-- Creating the headlines -->
<p id="h1">SCATTER PLOT | COLOUR</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>  
  
<script>
​
//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 800 - m.left - m.right,
    h = 800 - 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})`);
​
//Global variables
var xCol = "sepal_length";
var yCol = "petal_length";
var rCol = "sepal_width";
var colorCol = "species";
​
//Scaling for the color
var c = d3.scaleOrdinal()
    .range(["#f5fa91", "#8ff798", "#85f6fa"]);
​
function render(data){
​
//X scale
var x = d3.scaleLinear()
    .domain(d3.extent(data, d => d[xCol]))
    .range([0, w]);
​
//Y scale
var y = d3.scaleLinear()
    .domain(d3.extent(data, d => d[yCol]))
    .range([h, 0]);
​
//Size scale domain
var r = d3.scaleLinear()
    .domain(d3.extent(data, d => d[rCol]))
    .range([5, 20]);
​
//X axis
svg.append("g")
    .attr("class", "x-axis")
    .attr("transform", `translate(0, ${h})`)
    .call(d3.axisBottom()
                     .scale(x)
                     .ticks(5)
             .tickSize(-h)
             .tickPadding(20));
​
//Y axis
svg.append("g")
    .attr("class", "y-axis")
    .attr("transform", `translate(0, 0)`)
    .call(d3.axisLeft()
                     .scale(y)
             .ticks(3)
             .tickSize(-w)
             .tickPadding(20));
​
//Data binding
svg.selectAll("circle")
     .data(data)
     .enter()
     .append("circle")
     .attr("cx", d => x(d[xCol]))
     .attr("cy", d => y(d[yCol]))
     .attr("r", d => r(d[rCol]))
     .attr("fill", d => c(d[colorCol]))
     .attr("stroke", d => c(d[colorCol]));
}
​
//Data type
function type(d) {
  d.sepal_length = +d.sepal_length;
  d.sepal_width = +d.sepal_width;
  d.petal_length = +d.petal_length;
  d.petal_width = +d.petal_width;
  return d;
}
​
//Data loading
d3.csv(
  "https://gist.githubusercontent.com/sandravizz/4521b93be28e0b83e3a4177b60e5361b/raw/85f536a3c349826d078a6ccbea88864d06515463/iris",
  type,
  render);
​
</script>
</body>
</html>
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