ColorBrewer2.org - color advices for cartography

[By Mike Bostock, for later reuse.]

A quick visual reference to every ColorBrewer scale; colors by Cynthia Brewer. Available in CSS and JS format. Click on a palette to log the constituent colors in hexadecimal RGB to the console.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  background: #ccc;
  width: 960px;
  height: 500px;
}

.palette {
  cursor: pointer;
  display: inline-block;
  vertical-align: bottom;
  margin: 4px 0 4px 6px;
  padding: 4px;
  background: #fff;
  border: solid 1px #aaa;
}

.swatch {
  display: block;
  vertical-align: middle;
  width: 37px;
  height: 22px;
}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/colorbrewer.v1.min.js"></script>
<script>

d3.select("body")
  .selectAll(".palette")
    .data(d3.entries(colorbrewer))
  .enter().append("span")
    .attr("class", "palette")
    .attr("title", function(d) { return d.key; })
    .on("click", function(d) { console.log(d3.values(d.value).map(JSON.stringify).join("\n")); })
  .selectAll(".swatch")
    .data(function(d) { return d.value[d3.keys(d.value).map(Number).sort(d3.descending)[0]]; })
  .enter().append("span")
    .attr("class", "swatch")
    .style("background-color", function(d) { return d; });

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://d3js.org/colorbrewer.v1.min.js to a secure url

https://d3js.org/d3.v3.min.js

https://d3js.org/colorbrewer.v1.min.js