53

我正在使用 d3 从相对 svg 位置画一条线，因此想要访问元素本身的坐标。我尝试了这样的事情（其中“this”指的是元素）

 .attr("x1", this.x)
 .attr("y1", this.y)

但 x1 和 y1 只是默认为零。获取 svg 元素坐标的正确方法是什么？

编辑：

这是我的（根据要求）我的整个代码。我正在尝试在可折叠树上实现这一点，当我将鼠标悬停在圆形节点上时，我会在其中画一条线。线的起点应该是我点击的圆圈，终点应该是 svg 平面上的一个固定点。

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <script type="text/javascript" src="d3.v3.js"></script>
    <script type="text/javascript" src="d3.layout.js"></script>
    <style type="text/css">

.node circle {
  cursor: pointer;
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}

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

path.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}

    </style>
  </head>
  <body>
    <div id="chart"></div>
    <script type="text/javascript">

var m = [20, 120, 20, 120],
    w = 2240 - m[1] - m[3],
    h = 800 - m[0] - m[2],
    i = 0,
    duration = 500,
    root;

var tree = d3.layout.tree()
    .size([h, w]);

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

var vis = d3.select("#chart").append("svg")
    .attr("width", w + m[1] + m[3])
    .attr("height", h + m[0] + m[2])
  .append("g")
    .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

function loadData(json) {
    root = json;
    d3.select("#processName").html(root.text);
    root.x0 = h / 2;
    root.y0 = 0;
    root.children.forEach(collapse);
    update(root);  
}

function collapse(d) {
    if (d.children) {
      d._children = d.children;
      d._children.forEach(collapse);
      d.children = null;
    }
 };

// Toggle children on click.
function click(d) {
  if (d.children) {
    d._children = d.children;
    d.children = null;
  } else {
    d.children = d._children;
    d._children = null;
  }
  update(d);
}

function update(source) {

  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse();

  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });

  // Update the nodes…
  var node = vis.selectAll("g.node")
      .data(nodes, function(d) { return d.id || (d.id = ++i); });

  // Enter any new nodes at the parent's previous position.
  var nodeEnter = node.enter().append("g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
      .on("click", click);

  nodeEnter.append("circle")
      .attr("r", 1e-6)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; })
    .on('mouseover', function(d, i){
        var dataset = [1,2,3,4]                                    // HERE
        vis.selectAll("line")                                      // HERE
            .data(dataset)                                 // HERE
            .enter()                                       // HERE
            .append("line")                                // HERE
            .attr("x1", this.x)                            // HERE'S THE PROBLEM FOR PERRY
            .attr("y1", this.y)                            // HERE'S THE PROBLEM FOR PERRY
            .attr("x2", 500)                               // HERE
            .attr("y2", 500)                               // HERE
            .style("stroke", "rgb(6,120,155)");}           // HERE
       ); 

  nodeEnter.append("text")
      .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
      .attr("dy", ".35em")
      .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
      .text(function(d) { return d.name; })
      .style("fill-opacity", 1e-6);

  // Transition nodes to their new position.
  var nodeUpdate = node.transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

  nodeUpdate.select("circle")
      .attr("r", 4.5)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeUpdate.select("text")
      .style("fill-opacity", 1);

  // Transition exiting nodes to the parent's new position.
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
      .remove();

  nodeExit.select("circle")
      .attr("r", 1e-6);

  nodeExit.select("text")
      .style("fill-opacity", 1e-6);

  // Update the links…
  var link = vis.selectAll("path.link")
      .data(tree.links(nodes), function(d) { return d.target.id; });

  // Enter any new links at the parent's previous position.
  link.enter().insert("path", "g")
      .attr("class", "link")
      .attr("d", function(d) {
        var o = {x: source.x0, y: source.y0};
        return diagonal({source: o, target: o});
      })
    .transition()
      .duration(duration)
      .attr("d", diagonal);

  // Transition links to their new position.
  link.transition()
      .duration(duration)
      .attr("d", diagonal);

  // Transition exiting nodes to the parent's new position.
  link.exit().transition()
      .duration(duration)
      .attr("d", function(d) {
        var o = {x: source.x, y: source.y};
        return diagonal({source: o, target: o});
      })
      .remove();

  // Stash the old positions for transition.
  nodes.forEach(function(d) {
    d.x0 = d.x;
    d.y0 = d.y;
  });

};

loadData({
 "name": "flare",
 "children": [
  {
   "name": "analytics",
   "children": [
    {
     "name": "cluster",
     "children": [
      {"name": "AgglomerativeCluster", "size": 3938},
      {"name": "CommunityStructure", "size": 3812},
      {"name": "HierarchicalCluster", "size": 6714},
      {"name": "MergeEdge", "size": 743}
     ]
    },
    {
     "name": "graph",
     "children": [
      {"name": "BetweennessCentrality", "size": 3534},
      {"name": "LinkDistance", "size": 5731},
      {"name": "MaxFlowMinCut", "size": 7840},
      {"name": "ShortestPaths", "size": 5914},
      {"name": "SpanningTree", "size": 3416}
     ]
    },
    {
     "name": "optimization",
     "children": [
      {"name": "AspectRatioBanker", "size": 7074}
     ]
    }
   ]
  },
  {
   "name": "animate",
   "children": [
    {"name": "Easing", "size": 17010},
    {"name": "FunctionSequence", "size": 5842},
    {
     "name": "interpolate",
     "children": [
      {"name": "ArrayInterpolator", "size": 1983},
      {"name": "ColorInterpolator", "size": 2047},
      {"name": "DateInterpolator", "size": 1375},
      {"name": "Interpolator", "size": 8746},
      {"name": "MatrixInterpolator", "size": 2202},
      {"name": "NumberInterpolator", "size": 1382},
      {"name": "ObjectInterpolator", "size": 1629},
      {"name": "PointInterpolator", "size": 1675},
      {"name": "RectangleInterpolator", "size": 2042}
     ]
    },
    {"name": "ISchedulable", "size": 1041},
    {"name": "Parallel", "size": 5176},
    {"name": "Pause", "size": 449},
    {"name": "Scheduler", "size": 5593},
    {"name": "Sequence", "size": 5534},
    {"name": "Transition", "size": 9201},
    {"name": "Transitioner", "size": 19975},
    {"name": "TransitionEvent", "size": 1116},
    {"name": "Tween", "size": 6006}
   ]
  },
  {
   "name": "data",
   "children": [
    {
     "name": "converters",
     "children": [
      {"name": "Converters", "size": 721},
      {"name": "DelimitedTextConverter", "size": 4294},
      {"name": "GraphMLConverter", "size": 9800},
      {"name": "IDataConverter", "size": 1314},
      {"name": "JSONConverter", "size": 2220}
     ]
    },
    {"name": "DataField", "size": 1759},
    {"name": "DataSchema", "size": 2165},
    {"name": "DataSet", "size": 586},
    {"name": "DataSource", "size": 3331},
    {"name": "DataTable", "size": 772},
    {"name": "DataUtil", "size": 3322}
   ]
  },
  {
   "name": "display",
   "children": [
    {"name": "DirtySprite", "size": 8833},
    {"name": "LineSprite", "size": 1732},
    {"name": "RectSprite", "size": 3623},
    {"name": "TextSprite", "size": 10066}
   ]
  },
  {
   "name": "flex",
   "children": [
    {"name": "FlareVis", "size": 4116}
   ]
  },
  {
   "name": "physics",
   "children": [
    {"name": "DragForce", "size": 1082},
    {"name": "GravityForce", "size": 1336},
    {"name": "IForce", "size": 319},
    {"name": "NBodyForce", "size": 10498},
    {"name": "Particle", "size": 2822},
    {"name": "Simulation", "size": 9983},
    {"name": "Spring", "size": 2213},
    {"name": "SpringForce", "size": 1681}
   ]
  },
  {
   "name": "query",
   "children": [
    {"name": "AggregateExpression", "size": 1616},
    {"name": "And", "size": 1027},
    {"name": "Arithmetic", "size": 3891},
    {"name": "Average", "size": 891},
    {"name": "BinaryExpression", "size": 2893},
    {"name": "Comparison", "size": 5103},
    {"name": "CompositeExpression", "size": 3677},
    {"name": "Count", "size": 781},
    {"name": "DateUtil", "size": 4141},
    {"name": "Distinct", "size": 933},
    {"name": "Expression", "size": 5130},
    {"name": "ExpressionIterator", "size": 3617},
    {"name": "Fn", "size": 3240},
    {"name": "If", "size": 2732},
    {"name": "IsA", "size": 2039},
    {"name": "Literal", "size": 1214},
    {"name": "Match", "size": 3748},
    {"name": "Maximum", "size": 843},
    {
     "name": "methods",
     "children": [
      {"name": "add", "size": 593},
      {"name": "and", "size": 330},
      {"name": "average", "size": 287},
      {"name": "count", "size": 277},
      {"name": "distinct", "size": 292},
      {"name": "div", "size": 595},
      {"name": "eq", "size": 594},
      {"name": "fn", "size": 460},
      {"name": "gt", "size": 603},
      {"name": "gte", "size": 625},
      {"name": "iff", "size": 748},
      {"name": "isa", "size": 461},
      {"name": "lt", "size": 597},
      {"name": "lte", "size": 619},
      {"name": "max", "size": 283},
      {"name": "min", "size": 283},
      {"name": "mod", "size": 591},
      {"name": "mul", "size": 603},
      {"name": "neq", "size": 599},
      {"name": "not", "size": 386},
      {"name": "or", "size": 323},
      {"name": "orderby", "size": 307},
      {"name": "range", "size": 772},
      {"name": "select", "size": 296},
      {"name": "stddev", "size": 363},
      {"name": "sub", "size": 600},
      {"name": "sum", "size": 280},
      {"name": "update", "size": 307},
      {"name": "variance", "size": 335},
      {"name": "where", "size": 299},
      {"name": "xor", "size": 354},
      {"name": "_", "size": 264}
     ]
    },
    {"name": "Minimum", "size": 843},
    {"name": "Not", "size": 1554},
    {"name": "Or", "size": 970},
    {"name": "Query", "size": 13896},
    {"name": "Range", "size": 1594},
    {"name": "StringUtil", "size": 4130},
    {"name": "Sum", "size": 791},
    {"name": "Variable", "size": 1124},
    {"name": "Variance", "size": 1876},
    {"name": "Xor", "size": 1101}
   ]
  },
  {
   "name": "scale",
   "children": [
    {"name": "IScaleMap", "size": 2105},
    {"name": "LinearScale", "size": 1316},
    {"name": "LogScale", "size": 3151},
    {"name": "OrdinalScale", "size": 3770},
    {"name": "QuantileScale", "size": 2435},
    {"name": "QuantitativeScale", "size": 4839},
    {"name": "RootScale", "size": 1756},
    {"name": "Scale", "size": 4268},
    {"name": "ScaleType", "size": 1821},
    {"name": "TimeScale", "size": 5833}
   ]
  },
  {
   "name": "util",
   "children": [
    {"name": "Arrays", "size": 8258},
    {"name": "Colors", "size": 10001},
    {"name": "Dates", "size": 8217},
    {"name": "Displays", "size": 12555},
    {"name": "Filter", "size": 2324},
    {"name": "Geometry", "size": 10993},
    {
     "name": "heap",
     "children": [
      {"name": "FibonacciHeap", "size": 9354},
      {"name": "HeapNode", "size": 1233}
     ]
    },
    {"name": "IEvaluable", "size": 335},
    {"name": "IPredicate", "size": 383},
    {"name": "IValueProxy", "size": 874},
    {
     "name": "math",
     "children": [
      {"name": "DenseMatrix", "size": 3165},
      {"name": "IMatrix", "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}
   ]
  }
 ]
});


    </script>
  </body>
</html>
4

7 回答 7

65

element.getBoundingClientRect()无论 svg 是否已缩放和/或平移，该方法都将返回元素相对于视口的正确坐标。

看到这个问题和答案。

虽然 getBBox() 适用于未转换的空间，但如果已将缩放和平移应用于布局，则它将不再准确。当平移和缩放生效时，getBoundingClientRect() 函数在强制布局项目中效果很好，我想将 HTML Div 元素作为标签附加到节点，而不是使用 SVG 文本元素。

于 2013-10-05T22:53:00.870 回答
29

确定坐标的方式取决于您使用的元素。以circles 为例，cxandcy属性确定中心位置。此外，您可以translation通过transform更改任何坐标的参考点的属性来应用。

通常用于获取屏幕坐标的大多数方法不适用于 SVG。此外，如果要绘制的线与其连接的元素位于同一容器中，则您可能不需要绝对坐标。

编辑：

在您的特定代码中，很难获得节点的位置，因为它是由父元素的翻译决定的。因此，您需要获取父节点的变换属性并从中提取翻译。

d3.transform(d3.select(this.parentNode).attr("transform")).translate

在这里工作 jsfiddle 。

于 2013-10-03T08:48:44.340 回答
11

您可以使用该函数getBBox()获取路径的边界框。这将为您提供可能包含渲染路径的最紧凑矩形的位置和大小。

x与读取和值相比，使用此方法的一个优点y是它适用于所有图形对象。对象多于没有x和的路径，y例如有cx和的圆cy。

于 2013-10-03T08:58:43.630 回答
6

我使用合并功能，如下所示：

 element.transform.baseVal.consolidate()

.e 和 .f 值对应于 x 和 y 坐标

于 2016-03-12T18:44:47.497 回答
1

我可以这样处理；

svg.selectAll("rect")
    .data(zones)
    .enter()
    .append("rect")
    .attr("id", function (d) { return "zone" + d.zone; })
    .attr("class", "zone")
    .attr("x", function (d, i) {
        if (parseInt(i / (wcount)) % 2 == 0) {
            this.xcor = (i % wcount) * zoneW;
        }
        else {
            this.xcor = (zoneW * (wcount - 1)) - ((i % wcount) * zoneW);
        }

        return this.xcor;
    })

你可以再找到x坐标

svg.select("#zone1").on("click",function(){alert(this.xcor});
于 2015-02-23T20:57:04.733 回答
1 
svg.selectAll("rect")
.attr('x',function(d,i){
    // get x coord
    console.log(this.getBBox().x, 'or', d3.select(this).attr('x'))
})
.attr('y',function(d,i){
    // get y coord
    console.log(this.getBBox().y)
})
.attr('dx',function(d,i){
    // get dx coord
    console.log(parseInt(d3.select(this).attr('dx')))
})
于 2018-06-18T23:06:35.350 回答
0

我试图用一个矩形选择一个 svg 区域并从中获取所有元素。为此， element.getBoundingClientRect() 非常适合我。它返回 svg 元素的当前坐标，无论 svg 是缩放还是变换。

于 2019-09-10T16:12:57.093 回答