This is the code for Chapter 4, Figure 4 from D3.js in Action showing how to create a scatterplot using scales and d3.extent() to calculate min and max values for data.
Ch. 4, Fig. 4 - D3.js in Action
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<html> | |
<head> | |
<title>D3 in Action Chapter 4 - Example 2</title> | |
<meta charset="utf-8" /> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
</head> | |
<style> | |
svg { | |
height: 500px; | |
width: 500px; | |
border: 1px solid gray; | |
} | |
</style> | |
<body> | |
<div id="viz"> | |
<svg> | |
</svg> | |
</div> | |
</body> | |
<footer> | |
<script> | |
var scatterData = [{friends: 5, salary: 22000}, {friends: 3, salary: 18000}, {friends: 10, salary: 88000}, {friends: 0, salary: 180000}, {friends: 27, salary: 56000}, {friends: 8, salary: 74000}] | |
xExtent = d3.extent(scatterData, function(d) {return d.salary}); | |
yExtent = d3.extent(scatterData, function(d) {return d.friends}); | |
xScale = d3.scale.linear().domain(xExtent).range([0,500]); | |
yScale = d3.scale.linear().domain(yExtent).range([0,500]); | |
d3.select("svg") | |
.selectAll("circle") | |
.data(scatterData) | |
.enter() | |
.append("circle") | |
.attr("r", 5) | |
.attr("cx", function(d) {return xScale(d.salary)}) | |
.attr("cy", function(d) {return yScale(d.friends)}) | |
</script> | |
</footer> | |
</html> |
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