我对 d3.js 和 javascript 很陌生。 我只是想尝试一些 d3 示例代码。
我从这里复制了d3.js代码。
<!DOCTYPE html>
<meta charset="utf-8" />
<style>
.node circle {
fill: #999;
}
.node text {
font: 10px sans-serif;
}
.node--internal circle {
fill: #555;
}
.node--internal text {
text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff;
}
.link {
fill: none;
stroke: rgb(214, 15, 145);
stroke-opacity: 0.4;
stroke-width: 1px;
}
form {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
label {
display: block;
}
</style>
<svg width="928" height="928"></svg>
<script src="http://d3js.org/d3.v6.min.js"></script>
<script>
const data = {
name: "Name",
children: [
{
name: "A_F",
children: [
{
name: "Alice",
},
{
name: "Bob",
},
{
name: "Charlie",
},
],
},
{
name: "G_P",
children: [
{
name: "Gary",
},
{
name: "Helen",
},
],
},
],
};
// Specify the chart’s dimensions.
const width = 928;
const height = width;
const radius = width / 6;
// Create the color scale.
const color = d3.scaleOrdinal(d3.quantize(d3.interpolateRainbow, data.children.length + 1));
// Compute the layout.
const hierarchy = d3.hierarchy(data)
.sum(d => d.value)
.sort((a, b) => b.value - a.value);
const root = d3.partition()
.size([2 * Math.PI, hierarchy.height + 1])
(hierarchy);
root.each(d => d.current = d);
// Create the arc generator.
const arc = d3.arc()
.startAngle(d => d.x0)
.endAngle(d => d.x1)
.padAngle(d => Math.min((d.x1 - d.x0) / 2, 0.005))
.padRadius(radius * 1.5)
.innerRadius(d => d.y0 * radius)
.outerRadius(d => Math.max(d.y0 * radius, d.y1 * radius - 1))
// Create the SVG container.
const svg = d3.create("svg")
.attr("viewBox", [-width / 2, -height / 2, width, width])
.style("font", "10px sans-serif");
// Append the arcs.
const path = svg.append("g")
.selectAll("path")
.data(root.descendants().slice(1))
.join("path")
.attr("fill", d => { while (d.depth > 1) d = d.parent; return color(d.data.name); })
.attr("fill-opacity", d => arcVisible(d.current) ? (d.children ? 0.6 : 0.4) : 0)
.attr("pointer-events", d => arcVisible(d.current) ? "auto" : "none")
.attr("d", d => arc(d.current));
// Make them clickable if they have children.
path.filter(d => d.children)
.style("cursor", "pointer")
.on("click", clicked);
const format = d3.format(",d");
path.append("title")
.text(d => `${d.ancestors().map(d => d.data.name).reverse().join("/")}\n${format(d.value)}`);
const label = svg.append("g")
.attr("pointer-events", "none")
.attr("text-anchor", "middle")
.style("user-select", "none")
.selectAll("text")
.data(root.descendants().slice(1))
.join("text")
.attr("dy", "0.35em")
.attr("fill-opacity", d => +labelVisible(d.current))
.attr("transform", d => labelTransform(d.current))
.text(d => d.data.name);
const parent = svg.append("circle")
.datum(root)
.attr("r", radius)
.attr("fill", "none")
.attr("pointer-events", "all")
.on("click", clicked);
// Handle zoom on click.
function clicked(event, p) {
parent.datum(p.parent || root);
root.each(d => d.target = {
x0: Math.max(0, Math.min(1, (d.x0 - p.x0) / (p.x1 - p.x0))) * 2 * Math.PI,
x1: Math.max(0, Math.min(1, (d.x1 - p.x0) / (p.x1 - p.x0))) * 2 * Math.PI,
y0: Math.max(0, d.y0 - p.depth),
y1: Math.max(0, d.y1 - p.depth)
});
const t = svg.transition().duration(750);
// Transition the data on all arcs, even the ones that aren’t visible,
// so that if this transition is interrupted, entering arcs will start
// the next transition from the desired position.
path.transition(t)
.tween("data", d => {
const i = d3.interpolate(d.current, d.target);
return t => d.current = i(t);
})
.filter(function(d) {
return +this.getAttribute("fill-opacity") || arcVisible(d.target);
})
.attr("fill-opacity", d => arcVisible(d.target) ? (d.children ? 0.6 : 0.4) : 0)
.attr("pointer-events", d => arcVisible(d.target) ? "auto" : "none")
.attrTween("d", d => () => arc(d.current));
label.filter(function(d) {
return +this.getAttribute("fill-opacity") || labelVisible(d.target);
}).transition(t)
.attr("fill-opacity", d => +labelVisible(d.target))
.attrTween("transform", d => () => labelTransform(d.current));
}
function arcVisible(d) {
return d.y1 <= 3 && d.y0 >= 1 && d.x1 > d.x0;
}
function labelVisible(d) {
return d.y1 <= 3 && d.y0 >= 1 && (d.y1 - d.y0) * (d.x1 - d.x0) > 0.03;
}
function labelTransform(d) {
const x = (d.x0 + d.x1) / 2 * 180 / Math.PI;
const y = (d.y0 + d.y1) / 2 * radius;
return `rotate(${x - 90}) translate(${y},0) rotate(${x < 180 ? 0 : 180})`;
}
svg.node();
</script>
我唯一编辑的就是删除最后一个
return svg.node();svg.node();当我启动本地http服务器（
py3 -m http.server 8000inspect只是想了解如何分类这个问题并排除故障。谢谢！
不幸的是，D3 规范示例通常在 Observable 上找到，虽然具有交互性和实用性，但如果不进行一两处更改，就无法转换为常规的 'ol javascript。
首先，Observable 使用
return svg.node()但是，您的示例具有一种数据格式，其中叶节点（本身没有子节点的节点）具有 value 属性：
"children":[{"name":"AgglomerativeCluster","value":3938},{"name":"CommunityStructure","value":3812}
虽然您的数据没有：
children: [{ name: "Alice", }, { name: "Bob", },
这很重要，因为层次结构使用求和函数来列出每个节点的相对大小：
const hierarchy = d3.hierarchy(data)
.sum(d => d.value)
因此，您可以向每个叶节点添加一个 value 属性，这将生成一个视觉效果。但是，如果每个叶子应该具有相同的权重，那么您可以使用：
const hierarchy = d3.hierarchy(data)
.count()
其中每个父节点将根据每个分支中叶节点的数量进行加权。