t-viSNE: Interactive Assessment and Interpretation of t-SNE Projections https://doi.org/10.1109/TVCG.2020.2986996
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t-viSNE/modules/d3-legend/docs/example.html

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
margin: 0;
overflow: hidden;
}
svg {
font: 10px sans-serif;
}
.caption {
font-weight: bold;
}
.key path {
display: none;
}
.key line {
stroke: #000;
shape-rendering: crispEdges;
}
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="../d3-legend.min.js"></script>
<script>
var width = 960,
height = 500,
formatPercent = d3.format(".0%"),
formatNumber = d3.format(".0f");
var threshold = d3.scale.threshold()
.domain([.11, .22, .33, .50])
.range(["#6e7c5a", "#a0b28f", "#d8b8b3", "#b45554", "#760000"]);
// A position encoding for the key only.
var x = d3.scale.linear()
.domain([0, 1])
.range([0, 240]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom")
.tickSize(13)
.tickValues(threshold.domain())
.tickFormat(function(d) { return d === .5 ? formatPercent(d) : formatNumber(100 * d); });
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var g = svg.append("g")
.attr("class", "key")
.attr("transform", "translate(" + (width - 240) / 2 + "," + height / 2 + ")");
var legend = d3.legend.color()
.scale(threshold)
.orient("horizontal")
.shapeWidth(60);
svg.append("g")
.attr("class", "legend")
.attr("transform", "translate(20,20)");
svg.select(".legend")
.call(legend);
g.selectAll("rect")
.data(threshold.range().map(function(color) {
var d = threshold.invertExtent(color);
if (d[0] == null) d[0] = x.domain()[0];
if (d[1] == null) d[1] = x.domain()[1];
return d;
}))
.enter().append("rect")
.attr("height", 8)
.attr("x", function(d) { return x(d[0]); })
.attr("width", function(d) { return x(d[1]) - x(d[0]); })
.style("fill", function(d) { return threshold(d[0]); });
g.call(xAxis).append("text")
.attr("class", "caption")
.attr("y", -6)
.text("Percentage of stops that involved force");
</script>