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<!-- Used online example to help with legend https://bl.ocks.org/mbostock/3887118 -->
<meta charset="utf-8">
<style> /* set the CSS */
</style>
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {top: 50, right: 250, bottom: 100, left: 100},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// set X and Y axis
var x = d3.scaleLinear()
.range([0, width]);
var y = d3.scaleLinear()
.range([height, 0]);
// set color func
var color = d3.scaleOrdinal(d3.schemeCategory20);
var valueline = d3.line()
.x(function(d) {return x(d.Robbery);})
.y(function(d) {return y(d.Assault);});
// create svg
var svg = d3.select("body").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 data
d3.csv("crime3.csv", function(error, data) {
if (error) throw error;
// format data
data.forEach(function(d) {
d.Robbery = +d.Robbery;
d.Assault = +d.Assault;
});
console.log(data);
// Scale the range of the data for X and Y axis
x.domain(d3.extent(data, function(d) { return d.Robbery; }));
y.domain(d3.extent(data, function(d) { return d.Assault; }));
// Add the scatterplot
svg.selectAll("dot")
.data(data)
.enter().append("circle")
.attr("r", 5)
.attr("cx", function(d) { return x(d.Robbery); })
.attr("cy", function(d) { return y(d.Assault); })
.style("fill", function(d){ return color(d.Department); });
// add the x-axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// add x-axis label
svg.append("text")
.attr("text-anchor", "end")
.attr("x", width/2)
.attr("y", height + 50)
.text("# Robbery");
// add y-axis
svg.append("g")
.call(d3.axisLeft(y));
//add y-axis label
svg.append("text")
.attr("transform", "rotate(-90)")
.attr("x",0 - (height / 2))
.attr("y", 0 - margin.left + 20)
.attr("dy", "1em")
.style("text-anchor", "middle")
.text("# Assault");
//adding title
svg.append("text")
.attr("text-anchor", "end")
.attr("x", width/2 + 50)
.attr("y", -15)
.text("Alabaster Assault v Robbery");
var legend = svg.selectAll('legend')
.data(color.domain())
.enter()
.append('g')
.attr('class', 'legend')
.attr('transform', function(d,i){ return 'translate(0,' + i * 20 + ')'; });
//cretaing legend
legend.append('rect')
.attr('x', width + 20)
.attr('width', 18)
.attr('height', 18)
.style('fill', color);
legend.append('text')
.attr('x', width + 40)
.attr('y', 9)
.attr('dy', '.35em')
.style('text-anchor', 'start')
.text(function(d){ return d; });
});
</script>
</body>
https://d3js.org/d3.v4.min.js