css - D3 树布局 : weird behavior of shadow filter when . nodeSize() 被应用

Question

当我设置 nodeSize 时对于 D3 树布局，应用的阴影过滤器使线条在特定点上方不可见:

演示:https://jsfiddle.net/y9Ldey25/

如果没有应用过滤器，链接将再次可见(在 jsFiddle 演示中，在 css 行 2 中注释掉:filter: url(#shadow);)。

如果我设置总布局，一切正常 size ，而不是 nodeSize(交换第 6 行和第 7 行的注释)。

将svg height调大，“可见区域”变大，但也会在下方造成太多未使用的空间，这是不合适的。 (交换第 2 行和第 3 行的注释)。

var width = 960,
    height = 2000
    //height = 4000;

var tree = d3.layout.tree()
    .nodeSize([10, 100])
    //.size([height, width - 160])

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(40,400)")
    .append("g");
    
    // shadow filter
    var defs = svg.append("defs");
        var filter = defs
            .append("filter")
            .attr("id", "shadow")
            .attr("height", "130%")
            .attr("filterUnits", "userSpaceOnUse");
        filter.append("feOffset")
            .attr("in", "blur")
            .attr("dx", 4)
            .attr("dy", 4)
            .attr("result", "offsetBlur");
        filter.append("feFlood");
        filter.append("feComposite")
            .attr("operator", "in")
            .attr("in2", "offsetBlur");
        filter.append("feGaussianBlur")
            .attr("stdDeviation", 3);
        var merge = filter.append("feMerge");
        merge.append("feMergeNode");
        merge.append("feMergeNode").attr("in", "SourceGraphic");

var json = data();

  var nodes = tree.nodes(json),
      links = tree.links(nodes);

  var link = svg.selectAll("path.link")
      .data(links)
    .enter().append("path")
      .attr("class", "link")
      .attr("d", diagonal);

  var node = svg.selectAll("g.node")
      .data(nodes)
    .enter().append("g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; })

  node.append("circle")
      .attr("r", 4.5);

  node.append("text")
      .attr("dx", function(d) { return d.children ? -8 : 8; })
      .attr("dy", 3)
      .attr("text-anchor", function(d) { return d.children ? "end" : "start"; })
      .text(function(d) { return d.name; });

d3.select(self.frameElement).style("height", height + "px");


function data() {
return data = 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}

path {
  filter: url(#shadow);
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}
.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}

.node {
  font: 10px sans-serif;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

取自原始示例的代码 https://bl.ocks.org/mbostock/4339184

Answer 1

您在 userSpace 中指定 filterUnits，然后提供一个 objectBoundingBox 维度。更改为:

    .attr("height", "130%")
    .attr("filterUnits", "objectBoundingBox")