[javascript] Wie bekomme ich Koordinaten eines Svg Elements?



2 Answers

Die Methode " element.getBoundingClientRect() " gibt die richtigen Koordinaten eines Elements relativ zum Ansichtsfenster zurück, unabhängig davon, ob die SVG skaliert und / oder übersetzt wurde.

Siehe diese Frage und Antwort .

Während getBBox () für einen nicht transformierten Bereich arbeitet, ist Skalierung und Translation nicht mehr korrekt, wenn sie auf das Layout angewendet wurden. Die getBoundingClientRect () - Funktion hat sich in einem Force-Layout-Projekt gut bewährt, wenn Pan und Zoom aktiviert sind, wo ich HTML-Div-Elemente als Beschriftungen an die Knoten anhängen wollte, anstatt SVG-Textelemente zu verwenden.

Question

Ich verwende d3, um eine Linie von einer relativen Svg-Position zu zeichnen und möchte daher auf die Koordinaten des Elements selbst zugreifen. Ich habe so etwas versucht (wobei "dies" sich auf das Element bezieht)

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

aber die x1 und y1 sind nur auf Null voreingestellt. Was ist der richtige Weg, um die Koordinaten des Svg-Elements zu erhalten?

BEARBEITEN:

Hier ist mein (auf Anfrage) mein ganzer Code. Ich versuche, dies auf dem zusammenklappbaren Baum zu implementieren, wo ich eine Linie zeichne, wenn ich mit der Maus über einen Kreisknoten schwebe. Der Startpunkt der Linie sollte von dem Kreis sein, auf den ich klicke, und der Endpunkt sollte ein Fixpunkt auf der SVG-Ebene sein.

<!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",
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   "name": "analytics",
   "children": [
    {
     "name": "cluster",
     "children": [
      {"name": "AgglomerativeCluster", "size": 3938},
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     "name": "graph",
     "children": [
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      {"name": "LinkDistance", "size": 5731},
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      {"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},
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    {"name": "TransitionEvent", "size": 1116},
    {"name": "Tween", "size": 6006}
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  },
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   "name": "data",
   "children": [
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     "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},
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  },
  {
   "name": "display",
   "children": [
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 ]
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    </script>
  </body>
</html>



Ich benutze die Konsolidierungsfunktion wie folgt:

 element.transform.baseVal.consolidate()

Die Werte .e und .f entsprechen den x- und y-Koordinaten




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')))
})



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