Wind Rose Plot

A wind rose is a graphic tool used by meteorologists to give a succinct view of how wind speed and direction are typically distributed at a particular location (https://en.wikipedia.org/wiki/Wind_rose). The chart is built with inspiration and code from two examples created by Mike Bostock (https://bl.ocks.org/mbostock/6fead6d1378d6df5ae77bb6a719afcb2. Tags: windrose, wind rose, rose plot

<!DOCTYPE html>
<meta charset="utf-8">
<svg width="960" height="960" font-family="sans-serif" font-size="10"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="d3-scale-radial.js"></script>
<style>
    .axis {
        stroke: gray
    }
</style>
<script>

var svg = d3.select("svg"),
        width = +svg.attr("width"),
        height = +svg.attr("height"),
        margin = {top: 40, right: 80, bottom: 40, left: 40},
        innerRadius = 20,
        chartWidth = width - margin.left - margin.right,
        chartHeight= height - margin.top - margin.bottom,
        outerRadius = (Math.min(chartWidth, chartHeight) / 2),
        g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

var angle = d3.scaleLinear()
        .range([0, 2 * Math.PI]);

var radius = d3.scaleLinear()
        .range([innerRadius, outerRadius]);

var x = d3.scaleBand()
        .range([0, 2 * Math.PI])
        .align(0);

var y = d3.scaleLinear() //you can try scaleRadial but it scales differently
        .range([innerRadius, outerRadius]);

var z = d3.scaleOrdinal()
        .range(["#4242f4", "#42c5f4", "#42f4ce", "#42f456", "#adf442", "#f4e242", "#f4a142", "#f44242"]);

d3.csv("data.csv", function(d, i, columns) {
        for (i = 1, t = 0; i < columns.length; ++i) t += d[columns[i]] = +d[columns[i]];
        d.total = t;
        return d;
    }, function(error, data) {
        if (error) throw error;

x.domain(data.map(function(d) { return d.angle; }));
        y.domain([0, d3.max(data, function(d) { return d.total; })]);
        z.domain(data.columns.slice(1));
        // Extend the domain slightly to match the range of [0, 2π].
        angle.domain([0, d3.max(data, function(d,i) { return i + 1; })]);
        radius.domain([0, d3.max(data, function(d) { return d.y0 + d.y; })]);
        angleOffset = -360.0/data.length/2.0;
        g.append("g")
            .selectAll("g")
            .data(d3.stack().keys(data.columns.slice(1))(data))
            .enter().append("g")
            .attr("fill", function(d) { return z(d.key); })
            .selectAll("path")
            .data(function(d) { return d; })
            .enter().append("path")
            .attr("d", d3.arc()
                .innerRadius(function(d) { return y(d[0]); })
                .outerRadius(function(d) { return y(d[1]); })
                .startAngle(function(d) { return x(d.data.angle); })
                .endAngle(function(d) { return x(d.data.angle) + x.bandwidth(); })
                .padAngle(0.01)
                .padRadius(innerRadius))
            .attr("transform", function() {return "rotate("+ angleOffset + ")"});

var label = g.append("g")
            .selectAll("g")
            .data(data)
            .enter().append("g")
            .attr("text-anchor", "middle")
            .attr("transform", function(d) { return "rotate(" + ((x(d.angle) + x.bandwidth() / 2) * 180 / Math.PI - (90-angleOffset)) + ")translate(" + (outerRadius+30) + ",0)"; });

label.append("text")
            .attr("transform", function(d) { return (x(d.angle) + x.bandwidth() / 2 + Math.PI / 2) % (2 * Math.PI) < Math.PI ? "rotate(90)translate(0,16)" : "rotate(-90)translate(0,-9)"; })
            .text(function(d) { return d.angle; })
            .style("font-size",14);

g.selectAll(".axis")
            .data(d3.range(angle.domain()[1]))
            .enter().append("g")
            .attr("class", "axis")
            .attr("transform", function(d) { return "rotate(" + angle(d) * 180 / Math.PI + ")"; })
            .call(d3.axisLeft()
                .scale(radius.copy().range([-innerRadius, -(outerRadius+10)])));

var yAxis = g.append("g")
            .attr("text-anchor", "middle");

var yTick = yAxis
            .selectAll("g")
            .data(y.ticks(5).slice(1))
            .enter().append("g");

yTick.append("circle")
            .attr("fill", "none")
            .attr("stroke", "gray")
            .attr("stroke-dasharray", "4,4")
            .attr("r", y);

yTick.append("text")
            .attr("y", function(d) { return -y(d); })
            .attr("dy", "-0.35em")
            .attr("x", function() { return -10; })
            .text(y.tickFormat(5, "s"))
            .style("font-size",14);

var legend = g.append("g")
            .selectAll("g")
            .data(data.columns.slice(1).reverse())
            .enter().append("g")
//            .attr("transform", function(d, i) { return "translate(-40," + (i - (data.columns.length - 1) / 2) * 20 + ")"; });
            .attr("transform", function(d, i) { return "translate(" + (outerRadius+0) + "," + (-outerRadius + 40 +(i - (data.columns.length - 1) / 2) * 20) + ")"; });

legend.append("rect")
            .attr("width", 18)
            .attr("height", 18)
            .attr("fill", z);

legend.append("text")
            .attr("x", 24)
            .attr("y", 9)
            .attr("dy", "0.35em")
            .text(function(d) { return d; })
            .style("font-size",12);
    });

</script>

https://d3js.org/d3.v4.min.js