javascript - D3 Sunburst - 可以显示某些图层

Question

我查看旭日图 - 即来自此示例:

https://bl.ocks.org/kerryrodden/7090426

我想问D3中是否可以控制显示的环数。那么说我只想出现第二环？

我注意到这部分代码

// For efficiency, filter nodes to keep only those large enough to see.
var nodes = partition.nodes(json)
      .filter(function(d) {
          return (d.dx > 0.005); // 0.005 radians = 0.29 degrees
});

我尝试按照 d.depth = 2 的方式附加到此内容，但不起作用:

// For efficiency, filter nodes to keep only those large enough to see.
var nodes = partition.nodes(json)
          .filter(function(d) {
            if (d.depth = 2) {
              return (d.dx > 0.005); // 0.005 radians = 0.29 degrees
            }
});

如有任何帮助，我们将不胜感激。

谢谢。

Answer 1

你很接近，过滤器需要返回每个元素。尝试通过逻辑 && 添加深度检查:

// For efficiency, filter nodes to keep only those large enough to see.   
var nodes = partition.nodes(json)
    .filter(function(d) {
        return (d.dx > 0.005 && d.depth < 3); // 0.005 radians = 0.29 degrees
});