D3 树布局：应用 .nodeSize() 时阴影过滤器的奇怪行为

Question

当我为 D3 树布局设置nodeSize 时，应用的阴影过滤器使线条在某个点上方不可见：

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 第 2 行注释掉：filter: url(#shadow);）。

如果我设置总布局 size 而不是 nodeSize（交换第 6 行和第 7 行的注释），则一切正常。

让svg高度变大，使得“可见区域”变大，但也会在下方创造太多未使用的空间，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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rix","size":2815},{"name":"SparseMatrix","size":3366}]},{"name":"Maths","size":17705},{"name":"Orientation","size":1486},{"name":"palette","children":[{"name":"ColorPalette","size":6367},{"name":"Palette","size":1229},{"name":"ShapePalette","size":2059},{"name":"SizePalette","size":2291}]},{"name":"Property","size":5559},{"name":"Shapes","size":19118},{"name":"Sort","size":6887},{"name":"Stats","size":6557},{"name":"Strings","size":22026}]},{"name":"vis","children":[{"name":"axis","children":[{"name":"Axes","size":1302},{"name":"Axis","size":24593},{"name":"AxisGridLine","size":652},{"name":"AxisLabel","size":636},{"name":"CartesianAxes","size":6703}]},{"name":"controls","children":[{"name":"AnchorControl","size":2138},{"name":"ClickControl","size":3824},{"name":"Control","size":1353},{"name":"ControlList","size":4665},{"name":"DragControl","size":2649},{"name":"ExpandControl","size":2832},{"name":"HoverControl","size":4896},{"name":"IControl","size":763},{"name":"PanZoomControl","size":5222},{"name":"SelectionControl","size":7862},{"name":"TooltipControl","size":8435}]},{"name":"data","children":[{"name":"Data","size":20544},{"name":"DataList","size":19788},{"name":"DataSprite","size":10349},{"name":"EdgeSprite","size":3301},{"name":"NodeSprite","size":19382},{"name":"render","children":[{"name":"ArrowType","size":698},{"name":"EdgeRenderer","size":5569},{"name":"IRenderer","size":353},{"name":"ShapeRenderer","size":2247}]},{"name":"ScaleBinding","size":11275},{"name":"Tree","size":7147},{"name":"TreeBuilder","size":9930}]},{"name":"events","children":[{"name":"DataEvent","size":2313},{"name":"SelectionEvent","size":1880},{"name":"TooltipEvent","size":1701},{"name":"VisualizationEvent","size":1117}]},{"name":"legend","children":[{"name":"Legend","size":20859},{"name":"LegendItem","size":4614},{"name":"LegendRange","size":10530}]},{"name":"operator","children":[{"name":"distortion","children":[{"name":"BifocalDistortion","size":4461},{"name":"Distortion","size":6314},{"name":"FisheyeDistortion","size":3444}]},{"name":"encoder","children":[{"name":"ColorEncoder","size":3179},{"name":"Encoder","size":4060},{"name":"PropertyEncoder","size":4138},{"name":"ShapeEncoder","size":1690},{"name":"SizeEncoder","size":1830}]},{"name":"filter","children":[{"name":"FisheyeTreeFilter","size":5219},{"name":"GraphDistanceFilter","size":3165},{"name":"VisibilityFilter","size":3509}]},{"name":"IOperator","size":1286},{"name":"label","children":[{"name":"Labeler","size":9956},{"name":"RadialLabeler","size":3899},{"name":"StackedAreaLabeler","size":3202}]},{"name":"layout","children":[{"name":"AxisLayout","size":6725},{"name":"BundledEdgeRouter","size":3727},{"name":"CircleLayout","size":9317},{"name":"CirclePackingLayout","size":12003},{"name":"DendrogramLayout","size":4853},{"name":"ForceDirectedLayout","size":8411},{"name":"IcicleTreeLayout","size":4864},{"name":"IndentedTreeLayout","size":3174},{"name":"Layout","size":7881},{"name":"NodeLinkTreeLayout","size":12870},{"name":"PieLayout","size":2728},{"name":"RadialTreeLayout","size":12348},{"name":"RandomLayout","size":870},{"name":"StackedAreaLayout","size":9121},{"name":"TreeMapLayout","size":9191}]},{"name":"Operator","size":2490},{"name":"OperatorList","size":5248},{"name":"OperatorSequence","size":4190},{"name":"OperatorSwitch","size":2581},{"name":"SortOperator","size":2023}]},{"name":"Visualization","size":16540}]}]}
}

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>

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

Answer 1

您在 userSpace 中指定 filterUnits，然后给出 objectBoundingBox 维度。改为：

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