利用partition布局生成分区图

const width = 700, height = 500, padding = {top: 160, left: 130};
    d3.json("city.json", function (error, data) {

        const svg = d3.select("body").append("svg")
            .attr("width", width + padding.left * 2)
            .attr("height", height + padding.top * 2)
            .append("g");
        const partition = d3.layout.partition()
            .sort(null)
            .size([1000,height])
            .value(d=>1);
        const nodes = partition(data);
        const links = partition.links(nodes);
        const color = d3.scale.category20();
        console.log(nodes);
        console.log(links);
        const gRects = svg.selectAll("g")
            .data(nodes)
            .enter()
            .append("g");
        gRects.append("rect")
            .attr("x",d=>d.x)
            .attr("y",d=>d.y)
            .attr("width",d=>d.dx)
            .attr("height",d=>d.dy)
            .style("stroke","#FFF")
            .style("fill",d=>color((d.children?d:d.parent).name))
        gRects.append("text")
            .attr("class","nodeText")
            .attr("x",d=>d.x)
            .attr("y",d=>d.y)
            .attr("dx",d=>d.dx/2)
            .attr("dy",20)
            .text(d=>d.name)
    });

结果:

矩形分区图

圆形分区图

const svg = d3.select("body").append("svg")
            .attr("width", width + padding.left * 2)
            .attr("height", height + padding.top * 2)
            .append("g")
            .attr("transform","translate(400,350)");
        const radius = 400;
        const partition = d3.layout.partition()
            .sort(null)
            .size([2 * Math.PI, radius * radius])
            .value(d => 1);
        const nodes = partition(data);
        const links = partition.links(nodes);
        const color = d3.scale.category20();
        console.log(nodes);
        console.log(links);
        const arcPath = d3.svg.arc()
            .startAngle(d => d.x)
            .endAngle(d => d.x + d.dx)
            .innerRadius(d => Math.sqrt(d.y))
            .outerRadius(d => Math.sqrt(d.y + d.dy));
        const gArcs = svg.selectAll("g")
            .data(nodes)
            .enter()
            .append("g");
        gArcs.append("path")
            .attr("display", d => d.depth ? null : "none")
            .attr("d", arcPath)
            .style("stroke", "#fff")
            .style("fill", d => color((d.children ? d : d.parent).name));
        gArcs.append("text")
            .attr("class", "nodeText")
            .attr("dy", ".5em")
            .attr("transform", function (d, i) {
                if (i !== 0) {
                    let r = d.x + d.dx / 2;
                    const angle = Math.PI / 2;
                    r += r < Math.PI ? (angle * -1) : angle;
                    r *= 180 / Math.PI;
                    return `translate(${arcPath.centroid(d)})rotate(${r})`
                }
            })
            .text(d => d.name)

结果:

圆形分区图