何大小成

D3 · 一个饼状图

See the Pen OvbwYR by 何大小成 (@hopkinson) on CodePen.

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<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title></title>
  <style media="screen">
    text {
      text-anchor: middle;
    }

    line {
      stroke: black;
    }

    .tooltip {
      position: absolute;
      border: 1px solid;
      border-radius: 3px;
      border:1px solid white;
      padding: 3px;
    }
  </style>
</head>

<body>
  <script src="https://cdn.bootcss.com/d3/4.13.0/d3.min.js"></script>
  <script>
    const data = [{
        "number": 14,
        "name": "Locke"
      },
      {
        "number": 18,
        "name": "Reyes"
      },
      {
        "number": 15,
        "name": "Ford"
      },
      {
        "number": 16,
        "name": "Jarrah"
      },
      {
        "number": 23,
        "name": "Shephard"
      },
      {
        "number": 42,
        "name": "Kwon"
      }
    ];
    const width = 500
    const height = 900
    // 颜色
    const color = d3.scaleOrdinal(d3.schemeCategory10)
    // toiltip
    let tooltip = d3.select('body').append('div').attr('class', 'tooltip').style('opacity', 0)
    let pie = d3.pie()
      .sort(null)
      .value(d => d.number)
    const svg = d3.select('body').append('svg').attr('width', width).attr('height', height)
    // 内外半径
    const innerRadius = 0
    const outerRadius = width / 3
    // 创建弧
    const arc = d3.arc().innerRadius(innerRadius).outerRadius(outerRadius)
    // 添加数目对应的弧组
    let arcs = svg.selectAll('g')
      .data(pie(data))
      .enter()
      .append('g')
      .attr('transform', `translate(${width/2},${height/2})`)
    // 添加路径
    arcs.append('path')
      .attr('fill', (d, i) => color(i))
      .attr('d', arc)
    // 添加文字
    arcs.append('text')
      .attr('transform', d => {
        let x = arc.centroid(d)[0] * 1.2
        let y = arc.centroid(d)[1] * 1.2
        return `translate(${x}, ${y})`
      })
      .text(d => {
        let percent = Number(d.data.number) / d3.sum(data, d => d.number) * 100
        return percent.toFixed(1) + '%'
      })
    // 添加弧外直线
    arcs.append('line')
      .attr('x1', d => arc.centroid(d)[0] * 2)
      .attr('y1', d => arc.centroid(d)[1] * 2)
      .attr('x2', d => arc.centroid(d)[0] * 2.2)
      .attr('y2', d => arc.centroid(d)[1] * 2.2)
    // 添加户外直线的文字
    arcs.append('text')
      .attr('transform', d => {
        let x = arc.centroid(d)[0] * 2.5
        let y = arc.centroid(d)[1] * 2.5
        return `translate(${x}, ${y})`
      })
      .text(d => d.data.name)
    // 事件监听器
    arcs.on('mouseover', (d,i) => {
      tooltip.html(`${d.data.name}的出货量为${d.data.number}`)
        .style('opacity', 1)
        .style("left", (d3.event.pageX) + "px")
        .style("top", (d3.event.pageY - 28) + "px")
        .style('background-color', color(i))
    }).
    on('mousemove', d => {
      tooltip.style('left', `${d3.event.pageX}px`)
        .style('top', `${ d3.event.pageY + 20}px`)
    }).
    on('mouseout', d => {
      tooltip.style('opacity', 0)
    })
  </script>
</body>
</html>