Force layout zoom resets on first tick of dragging or zomming

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I\'m trying to implement a force layout graph using d3 v4, and I\'m having a problem with the default zooming and panning behaviours of the graph on the first tick of these

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别那么骄傲

2020-12-11 14:40

You shouldn't be manually setting the scale like you are doing with:

svg.attr("transform", "translate(" + (zoomWidth+400) + "," + (zoomHeight+325) + ")scale(" + initialScale + ")");

Instead, create a transform and operate on that using .call zoom.transform:

  // initial setup
  var zoom = d3.zoom()
    .scaleExtent([0.05, 2])
    .on("zoom", zoomed);

  var svg = d3.select("svg").call(zoom), //<-- apply zoom to svg
    g = svg.append("g"), //<-- g for append elements, this is what you are zooming
    width = 960,
    height = 600;

  var transform = d3.zoomIdentity //<-- create your transform with your initialScale
    .translate(width / 6, height / 6)
    .scale(0.5);

  svg.call(zoom.transform, transform); //<-- apply your initial transform, this will fire you zoomed event

EDITS FOR COMMENTS

The reason for separating out the svg and the g is that the svg element here is the event receiver. It is the element to which the zoom event handlers are bound (in most d3 examples, you'll see a rect element being used for this). The g on the other hand, is the container element that's being zoomed.

Here's a full example:

<!DOCTYPE html>
<meta charset="utf-8">
<style>
  .links line {
    stroke: #999;
    stroke-opacity: 0.6;
  }
  
  .nodes circle {
    stroke: #fff;
    stroke-width: 1.5px;
  }
</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

  var zoom = d3.zoom()
    .scaleExtent([0.05, 2])
    .on("zoom", zoomed);

  var svg = d3.select("svg").call(zoom),
    g = svg.append("g"),
    width = 960,
    height = 600;
    
  var transform = d3.zoomIdentity
    .translate(width / 6, height / 6)
    .scale(0.5);

  var color = d3.scaleOrdinal(d3.schemeCategory20);

  var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) {
      return d.id;
    }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2));

  svg.call(zoom.transform, transform);

  var graph = {"nodes":[{"id":"Myriel","group":1},{"id":"Napoleon","group":1},{"id":"Mlle.Baptistine","group":1},{"id":"Mme.Magloire","group":1},{"id":"CountessdeLo","group":1},{"id":"Geborand","group":1},{"id":"Champtercier","group":1},{"id":"Cravatte","group":1},{"id":"Count","group":1},{"id":"OldMan","group":1},{"id":"Labarre","group":2},{"id":"Valjean","group":2},{"id":"Marguerite","group":3},{"id":"Mme.deR","group":2},{"id":"Isabeau","group":2},{"id":"Gervais","group":2},{"id":"Tholomyes","group":3},{"id":"Listolier","group":3},{"id":"Fameuil","group":3},{"id":"Blacheville","group":3},{"id":"Favourite","group":3},{"id":"Dahlia","group":3},{"id":"Zephine","group":3},{"id":"Fantine","group":3},{"id":"Mme.Thenardier","group":4},{"id":"Thenardier","group":4},{"id":"Cosette","group":5},{"id":"Javert","group":4},{"id":"Fauchelevent","group":0},{"id":"Bamatabois","group":2},{"id":"Perpetue","group":3},{"id":"Simplice","group":2},{"id":"Scaufflaire","group":2},{"id":"Woman1","group":2},{"id":"Judge","group":2},{"id":"Champmathieu","group":2},{"id":"Brevet","group":2},{"id":"Chenildieu","group":2},{"id":"Cochepaille","group":2},{"id":"Pontmercy","group":4},{"id":"Boulatruelle","group":6},{"id":"Eponine","group":4},{"id":"Anzelma","group":4},{"id":"Woman2","group":5},{"id":"MotherInnocent","group":0},{"id":"Gribier","group":0},{"id":"Jondrette","group":7},{"id":"Mme.Burgon","group":7},{"id":"Gavroche","group":8},{"id":"Gillenormand","group":5},{"id":"Magnon","group":5},{"id":"Mlle.Gillenormand","group":5},{"id":"Mme.Pontmercy","group":5},{"id":"Mlle.Vaubois","group":5},{"id":"Lt.Gillenormand","group":5},{"id":"Marius","group":8},{"id":"BaronessT","group":5},{"id":"Mabeuf","group":8},{"id":"Enjolras","group":8},{"id":"Combeferre","group":8},{"id":"Prouvaire","group":8},{"id":"Feuilly","group":8},{"id":"Courfeyrac","group":8},{"id":"Bahorel","group":8},{"id":"Bossuet","group":8},{"id":"Joly","group":8},{"id":"Grantaire","group":8},{"id":"MotherPlutarch","group":9},{"id":"Gueulemer","group":4},{"id":"Babet","group":4},{"id":"Claquesous","group":4},{"id":"Montparnasse","group":4},{"id":"Toussaint","group":5},{"id":"Child1","group":10},{"id":"Child2","group":10},{"id":"Brujon","group":4},{"id":"Mme.Hucheloup","group":8}],"links":[{"source":"Napoleon","target":"Myriel","value":1},{"source":"Mlle.Baptistine","target":"Myriel","value":8},{"source":"Mme.Magloire","target":"Myriel","value":10},{"source":"Mme.Magloire","target":"Mlle.Baptistine","value":6},{"source":"CountessdeLo","target":"Myriel","value":1},{"source":"Geborand","target":"Myriel","value":1},{"source":"Champtercier","target":"Myriel","value":1},{"source":"Cravatte","target":"Myriel","value":1},{"source":"Count","target":"Myriel","value":2},{"source":"OldMan","target":"Myriel","value":1},{"source":"Valjean","target":"Labarre","value":1},{"source":"Valjean","target":"Mme.Magloire","value":3},{"source":"Valjean","target":"Mlle.Baptistine","value":3},{"source":"Valjean","target":"Myriel","value":5},{"source":"Marguerite","target":"Valjean","value":1},{"source":"Mme.deR","target":"Valjean","value":1},{"source":"Isabeau","target":"Valjean","value":1},{"source":"Gervais","target":"Valjean","value":1},{"source":"Listolier","target":"Tholomyes","value":4},{"source":"Fameuil","target":"Tholomyes","value":4},{"source":"Fameuil","target":"Listolier","value":4},{"source":"Blacheville","target":"Tholomyes","value":4},{"source":"Blacheville","target":"Listolier","value":4},{"source":"Blacheville","target":"Fameuil","value":4},{"source":"Favourite","target":"Tholomyes","value":3},{"source":"Favourite","target":"Listolier","value":3},{"source":"Favourite","target":"Fameuil","value":3},{"source":"Favourite","target":"Blacheville","value":4},{"source":"Dahlia","target":"Tholomyes","value":3},{"source":"Dahlia","target":"Listolier","value":3},{"source":"Dahlia","target":"Fameuil","value":3},{"source":"Dahlia","target":"Blacheville","value":3},{"source":"Dahlia","target":"Favourite","value":5},{"source":"Zephine","target":"Tholomyes","value":3},{"source":"Zephine","target":"Listolier","value":3},{"source":"Zephine","target":"Fameuil","value":3},{"source":"Zephine","target":"Blacheville","value":3},{"source":"Zephine","target":"Favourite","value":4},{"source":"Zephine","target":"Dahlia","value":4},{"source":"Fantine","target":"Tholomyes","value":3},{"source":"Fantine","target":"Listolier","value":3},{"source":"Fantine","target":"Fameuil","value":3},{"source":"Fantine","target":"Blacheville","value":3},{"source":"Fantine","target":"Favourite","value":4},{"source":"Fantine","target":"Dahlia","value":4},{"source":"Fantine","target":"Zephine","value":4},{"source":"Fantine","target":"Marguerite","value":2},{"source":"Fantine","target":"Valjean","value":9},{"source":"Mme.Thenardier","target":"Fantine","value":2},{"source":"Mme.Thenardier","target":"Valjean","value":7},{"source":"Thenardier","target":"Mme.Thenardier","value":13},{"source":"Thenardier","target":"Fantine","value":1},{"source":"Thenardier","target":"Valjean","value":12},{"source":"Cosette","target":"Mme.Thenardier","value":4},{"source":"Cosette","target":"Valjean","value":31},{"source":"Cosette","target":"Tholomyes","value":1},{"source":"Cosette","target":"Thenardier","value":1},{"source":"Javert","target":"Valjean","value":17},{"source":"Javert","target":"Fantine","value":5},{"source":"Javert","target":"Thenardier","value":5},{"source":"Javert","target":"Mme.Thenardier","value":1},{"source":"Javert","target":"Cosette","value":1},{"source":"Fauchelevent","target":"Valjean","value":8},{"source":"Fauchelevent","target":"Javert","value":1},{"source":"Bamatabois","target":"Fantine","value":1},{"source":"Bamatabois","target":"Javert","value":1},{"source":"Bamatabois","target":"Valjean","value":2},{"source":"Perpetue","target":"Fantine","value":1},{"source":"Simplice","target":"Perpetue","value":2},{"source":"Simplice","target":"Valjean","value":3},{"source":"Simplice","target":"Fantine","value":2},{"source":"Simplice","target":"Javert","value":1},{"source":"Scaufflaire","target":"Valjean","value":1},{"source":"Woman1","target":"Valjean","value":2},{"source":"Woman1","target":"Javert","value":1},{"source":"Judge","target":"Valjean","value":3},{"source":"Judge","target":"Bamatabois","value":2},{"source":"Champmathieu","target":"Valjean","value":3},{"source":"Champmathieu","target":"Judge","value":3},{"source":"Champmathieu","target":"Bamatabois","value":2},{"source":"Brevet","target":"Judge","value":2},{"source":"Brevet","target":"Champmathieu","value":2},{"source":"Brevet","target":"Valjean","value":2},{"source":"Brevet","target":"Bamatabois","value":1},{"source":"Chenildieu","target":"Judge","value":2},{"source":"Chenildieu","target":"Champmathieu","value":2},{"source":"Chenildieu","target":"Brevet","value":2},{"source":"Chenildieu","target":"Valjean","value":2},{"source":"Chenildieu","target":"Bamatabois","value":1},{"source":"Cochepaille","target":"Judge","value":2},{"source":"Cochepaille","target":"Champmathieu","value":2},{"source":"Cochepaille","target":"Brevet","value":2},{"source":"Cochepaille","target":"Chenildieu","value":2},{"source":"Cochepaille","target":"Valjean","value":2},{"source":"Cochepaille","target":"Bamatabois","value":1},{"source":"Pontmercy","target":"Thenardier","value":1},{"source":"Boulatruelle","target":"Thenardier","value":1},{"source":"Eponine","target":"Mme.Thenardier","value":2},{"source":"Eponine","target":"Thenardier","value":3},{"source":"Anzelma","target":"Eponine","value":2},{"source":"Anzelma","target":"Thenardier","value":2},{"source":"Anzelma","target":"Mme.Thenardier","value":1},{"source":"Woman2","target":"Valjean","value":3},{"source":"Woman2","target":"Cosette","value":1},{"source":"Woman2","target":"Javert","value":1},{"source":"MotherInnocent","target":"Fauchelevent","value":3},{"source":"MotherInnocent","target":"Valjean","value":1},{"source":"Gribier","target":"Fauchelevent","value":2},{"source":"Mme.Burgon","target":"Jondrette","value":1},{"source":"Gavroche","target":"Mme.Burgon","value":2},{"source":"Gavroche","target":"Thenardier","value":1},{"source":"Gavroche","target":"Javert","value":1},{"source":"Gavroche","target":"Valjean","value":1},{"source":"Gillenormand","target":"Cosette","value":3},{"source":"Gillenormand","target":"Valjean","value":2},{"source":"Magnon","target":"Gillenormand","value":1},{"source":"Magnon","target":"Mme.Thenardier","value":1},{"source":"Mlle.Gillenormand","target":"Gillenormand","value":9},{"source":"Mlle.Gillenormand","target":"Cosette","value":2},{"source":"Mlle.Gillenormand","target":"Valjean","value":2},{"source":"Mme.Pontmercy","target":"Mlle.Gillenormand","value":1},{"source":"Mme.Pontmercy","target":"Pontmercy","value":1},{"source":"Mlle.Vaubois","target":"Mlle.Gillenormand","value":1},{"source":"Lt.Gillenormand","target":"Mlle.Gillenormand","value":2},{"source":"Lt.Gillenormand","target":"Gillenormand","value":1},{"source":"Lt.Gillenormand","target":"Cosette","value":1},{"source":"Marius","target":"Mlle.Gillenormand","value":6},{"source":"Marius","target":"Gillenormand","value":12},{"source":"Marius","target":"Pontmercy","value":1},{"source":"Marius","target":"Lt.Gillenormand","value":1},{"source":"Marius","target":"Cosette","value":21},{"source":"Marius","target":"Valjean","value":19},{"source":"Marius","target":"Tholomyes","value":1},{"source":"Marius","target":"Thenardier","value":2},{"source":"Marius","target":"Eponine","value":5},{"source":"Marius","target":"Gavroche","value":4},{"source":"BaronessT","target":"Gillenormand","value":1},{"source":"BaronessT","target":"Marius","value":1},{"source":"Mabeuf","target":"Marius","value":1},{"source":"Mabeuf","target":"Eponine","value":1},{"source":"Mabeuf","target":"Gavroche","value":1},{"source":"Enjolras","target":"Marius","value":7},{"source":"Enjolras","target":"Gavroche","value":7},{"source":"Enjolras","target":"Javert","value":6},{"source":"Enjolras","target":"Mabeuf","value":1},{"source":"Enjolras","target":"Valjean","value":4},{"source":"Combeferre","target":"Enjolras","value":15},{"source":"Combeferre","target":"Marius","value":5},{"source":"Combeferre","target":"Gavroche","value":6},{"source":"Combeferre","target":"Mabeuf","value":2},{"source":"Prouvaire","target":"Gavroche","value":1},{"source":"Prouvaire","target":"Enjolras","value":4},{"source":"Prouvaire","target":"Combeferre","value":2},{"source":"Feuilly","target":"Gavroche","value":2},{"source":"Feuilly","target":"Enjolras","value":6},{"source":"Feuilly","target":"Prouvaire","value":2},{"source":"Feuilly","target":"Combeferre","value":5},{"source":"Feuilly","target":"Mabeuf","value":1},{"source":"Feuilly","target":"Marius","value":1},{"source":"Courfeyrac","target":"Marius","value":9},{"source":"Courfeyrac","target":"Enjolras","value":17},{"source":"Courfeyrac","target":"Combeferre","value":13},{"source":"Courfeyrac","target":"Gavroche","value":7},{"source":"Courfeyrac","target":"Mabeuf","value":2},{"source":"Courfeyrac","target":"Eponine","value":1},{"source":"Courfeyrac","target":"Feuilly","value":6},{"source":"Courfeyrac","target":"Prouvaire","value":3},{"source":"Bahorel","target":"Combeferre","value":5},{"source":"Bahorel","target":"Gavroche","value":5},{"source":"Bahorel","target":"Courfeyrac","value":6},{"source":"Bahorel","target":"Mabeuf","value":2},{"source":"Bahorel","target":"Enjolras","value":4},{"source":"Bahorel","target":"Feuilly","value":3},{"source":"Bahorel","target":"Prouvaire","value":2},{"source":"Bahorel","target":"Marius","value":1},{"source":"Bossuet","target":"Marius","value":5},{"source":"Bossuet","target":"Courfeyrac","value":12},{"source":"Bossuet","target":"Gavroche","value":5},{"source":"Bossuet","target":"Bahorel","value":4},{"source":"Bossuet","target":"Enjolras","value":10},{"source":"Bossuet","target":"Feuilly","value":6},{"source":"Bossuet","target":"Prouvaire","value":2},{"source":"Bossuet","target":"Combeferre","value":9},{"source":"Bossuet","target":"Mabeuf","value":1},{"source":"Bossuet","target":"Valjean","value":1},{"source":"Joly","target":"Bahorel","value":5},{"source":"Joly","target":"Bossuet","value":7},{"source":"Joly","target":"Gavroche","value":3},{"source":"Joly","target":"Courfeyrac","value":5},{"source":"Joly","target":"Enjolras","value":5},{"source":"Joly","target":"Feuilly","value":5},{"source":"Joly","target":"Prouvaire","value":2},{"source":"Joly","target":"Combeferre","value":5},{"source":"Joly","target":"Mabeuf","value":1},{"source":"Joly","target":"Marius","value":2},{"source":"Grantaire","target":"Bossuet","value":3},{"source":"Grantaire","target":"Enjolras","value":3},{"source":"Grantaire","target":"Combeferre","value":1},{"source":"Grantaire","target":"Courfeyrac","value":2},{"source":"Grantaire","target":"Joly","value":2},{"source":"Grantaire","target":"Gavroche","value":1},{"source":"Grantaire","target":"Bahorel","value":1},{"source":"Grantaire","target":"Feuilly","value":1},{"source":"Grantaire","target":"Prouvaire","value":1},{"source":"MotherPlutarch","target":"Mabeuf","value":3},{"source":"Gueulemer","target":"Thenardier","value":5},{"source":"Gueulemer","target":"Valjean","value":1},{"source":"Gueulemer","target":"Mme.Thenardier","value":1},{"source":"Gueulemer","target":"Javert","value":1},{"source":"Gueulemer","target":"Gavroche","value":1},{"source":"Gueulemer","target":"Eponine","value":1},{"source":"Babet","target":"Thenardier","value":6},{"source":"Babet","target":"Gueulemer","value":6},{"source":"Babet","target":"Valjean","value":1},{"source":"Babet","target":"Mme.Thenardier","value":1},{"source":"Babet","target":"Javert","value":2},{"source":"Babet","target":"Gavroche","value":1},{"source":"Babet","target":"Eponine","value":1},{"source":"Claquesous","target":"Thenardier","value":4},{"source":"Claquesous","target":"Babet","value":4},{"source":"Claquesous","target":"Gueulemer","value":4},{"source":"Claquesous","target":"Valjean","value":1},{"source":"Claquesous","target":"Mme.Thenardier","value":1},{"source":"Claquesous","target":"Javert","value":1},{"source":"Claquesous","target":"Eponine","value":1},{"source":"Claquesous","target":"Enjolras","value":1},{"source":"Montparnasse","target":"Javert","value":1},{"source":"Montparnasse","target":"Babet","value":2},{"source":"Montparnasse","target":"Gueulemer","value":2},{"source":"Montparnasse","target":"Claquesous","value":2},{"source":"Montparnasse","target":"Valjean","value":1},{"source":"Montparnasse","target":"Gavroche","value":1},{"source":"Montparnasse","target":"Eponine","value":1},{"source":"Montparnasse","target":"Thenardier","value":1},{"source":"Toussaint","target":"Cosette","value":2},{"source":"Toussaint","target":"Javert","value":1},{"source":"Toussaint","target":"Valjean","value":1},{"source":"Child1","target":"Gavroche","value":2},{"source":"Child2","target":"Gavroche","value":2},{"source":"Child2","target":"Child1","value":3},{"source":"Brujon","target":"Babet","value":3},{"source":"Brujon","target":"Gueulemer","value":3},{"source":"Brujon","target":"Thenardier","value":3},{"source":"Brujon","target":"Gavroche","value":1},{"source":"Brujon","target":"Eponine","value":1},{"source":"Brujon","target":"Claquesous","value":1},{"source":"Brujon","target":"Montparnasse","value":1},{"source":"Mme.Hucheloup","target":"Bossuet","value":1},{"source":"Mme.Hucheloup","target":"Joly","value":1},{"source":"Mme.Hucheloup","target":"Grantaire","value":1},{"source":"Mme.Hucheloup","target":"Bahorel","value":1},{"source":"Mme.Hucheloup","target":"Courfeyrac","value":1},{"source":"Mme.Hucheloup","target":"Gavroche","value":1},{"source":"Mme.Hucheloup","target":"Enjolras","value":1}]};
  
  var link = g.append("g")
    .attr("class", "links")
    .selectAll("line")
    .data(graph.links)
    .enter().append("line")
    .attr("stroke-width", function(d) {
      return Math.sqrt(d.value);
    });

  var node = g.append("g")
    .attr("class", "nodes")
    .selectAll("circle")
    .data(graph.nodes)
    .enter().append("circle")
    .attr("r", 5)
    .attr("fill", function(d) {
      return color(d.group);
    })
    .call(d3.drag()
      .on("start", dragstarted)
      .on("drag", dragged)
      .on("end", dragended));

  node.append("title")
    .text(function(d) {
      return d.id;
    });

  simulation
    .nodes(graph.nodes)
    .on("tick", ticked);

  simulation.force("link")
    .links(graph.links);

  function ticked() {
    link
      .attr("x1", function(d) {
        return d.source.x;
      })
      .attr("y1", function(d) {
        return d.source.y;
      })
      .attr("x2", function(d) {
        return d.target.x;
      })
      .attr("y2", function(d) {
        return d.target.y;
      });

    node
      .attr("cx", function(d) {
        return d.x;
      })
      .attr("cy", function(d) {
        return d.y;
      });
  }

  function dragstarted(d) {
    if (!d3.event.active) simulation.alphaTarget(0.3).restart();
    d.fx = d.x;
    d.fy = d.y;
  }

  function dragged(d) {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
  }

  function dragended(d) {
    if (!d3.event.active) simulation.alphaTarget(0);
    d.fx = null;
    d.fy = null;
  }

  function zoomed() {
    g.attr("transform", d3.event.transform);
    // Manually offsets the zoom to compensate for the initial position. Should get fixed asap or the position variables made global.
    //svg.attr("transform", "translate(" + (d3.event.transform.x + 400) + "," + (d3.event.transform.y + 325) + ")scale(" +  d3.event.transform.k + ")");
  }
</script>

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