如何使用Vega/Vega-Lite创建响应式饼图并解决内容裁切问题

核心优化点 #

• 容器层面：将原本行内的span容器改为块级元素，设置宽度100%、最小高度，无需手动固定尺寸，天然跟随屏幕宽度自适应
• 图表配置层面：设置width和height为container，让图表尺寸直接继承容器大小
• 动态半径：用Vega-Lite内置的expr表达式，基于当前容器的宽高动态计算饼图半径，无需额外写JS监听重绘
• 裁切修复：给图表配置左侧内边距，预留图例展示空间，避免内容被裁切

完整可运行代码 #

<!DOCTYPE html>
<html>
<head>
  <title>Data visualizer</title>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <script src="https://cdn.jsdelivr.net/npm/vega@5"></script>
  <script src="https://cdn.jsdelivr.net/npm/vega-lite@5"></script>
  <script src="https://cdn.jsdelivr.net/npm/vega-embed@6"></script>
  <style>
    /* 容器自适应，无需固定宽高 */
    #pie-chart {
      display: block;
      width: 100%;
      min-height: 400px;
    }
  </style>
</head>
<body>
  <div id="pie-chart"></div>
  <script>
    vegaEmbed("#pie-chart", {
        $schema: "https://vega.github.io/schema/vega-lite/v5.json",
        autosize: {
            type: "fit",
            contains: "padding",
            resize: true
        },
        // 图表尺寸跟随容器
        width: "container",
        height: "container",
        // 预留左侧边距解决裁切问题
        padding: {left: 30, right: 10, top: 10, bottom: 10},
        layer: [
            {
              mark: {
                type: "arc",
                // 动态计算内外半径，取容器宽高最小值的比例，保证不超出边界
                innerRadius: {expr: "min(containerWidth, containerHeight) * 0.15"},
                outerRadius: {expr: "min(containerWidth, containerHeight) * 0.35"}
              }
            },
            {
                mark: {
                  type: "text",
                  // 文字半径取内外半径中间值
                  radius: {expr: "min(containerWidth, containerHeight) * 0.25"},
                  fill: "white"
                },
                encoding: {
                    text: {field: "count", type: "nominal"},
                },
            },
        ],
        encoding: {
            color: {
                field: "name",
                type: "nominal",
            },
            theta: {
                field: "count",
                type: "quantitative",
                stack: true,
            },
        },
        data: {
            values: [
                {name: "a", count: 21},
                {name: "b", count: 6},
                {name: "c", count: 3},
                {name: "d", count: 3},
                {name: "e", count: 2},
                {name: "f", count: 1},
                {name: "g", count: 2},
                {name: "h", count: 1},
            ],
        },
    });
  </script>
</body>
</html>

内容的提问来源于stack exchange，提问作者Noam I.