D3 v4 同时移动圆圈和文本

Question

作为起点，我使用此代码使用 D3 v4 创建有向图。

我想在每个圆圈上附加一个文本。我最初的想法是为数据中的每个节点创建一个节点元素，并向它们添加一个圆圈和文本元素（将来可能还会添加更多内容）。

然而，即使我更改刻度函数来更新它们的位置，圆圈和文本似乎根本没有渲染，如下所示：

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

我的实现可以在这个 jsfiddle和下面找到：

// Create somewhere to put the force directed graph
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

var radius = 20;

// DATA
var nodes_data =  [
    {"id": "Lillian", "sex": "F"},
    {"id": "Gordon", "sex": "M"},
    {"id": "Sylvester", "sex": "M"},
    {"id": "Mary", "sex": "F"},
    {"id": "Helen", "sex": "F"},
    {"id": "Jamie", "sex": "M"},
    {"id": "Jessie", "sex": "F"},
    {"id": "Ashton", "sex": "M"},
    {"id": "Duncan", "sex": "M"},
    {"id": "Evette", "sex": "F"},
    {"id": "Mauer", "sex": "M"},
    {"id": "Fray", "sex": "F"},
    {"id": "Duke", "sex": "M"},
    {"id": "Baron", "sex": "M"},
    {"id": "Infante", "sex": "M"},
    {"id": "Percy", "sex": "M"},
    {"id": "Cynthia", "sex": "F"},
    {"id": "Feyton", "sex": "M"},
    {"id": "Lesley", "sex": "F"},
    {"id": "Yvette", "sex": "F"},
    {"id": "Maria", "sex": "F"},
    {"id": "Lexy", "sex": "F"},
    {"id": "Peter", "sex": "M"},
    {"id": "Ashley", "sex": "F"},
    {"id": "Finkler", "sex": "M"},
    {"id": "Damo", "sex": "M"},
    {"id": "Imogen", "sex": "F"}];
var links_data = [
    {"source": "Sylvester", "target": "Gordon", "type":"A" },
    {"source": "Sylvester", "target": "Lillian", "type":"A" },
    {"source": "Sylvester", "target": "Mary", "type":"A"},
    {"source": "Sylvester", "target": "Jamie", "type":"A"},
    {"source": "Sylvester", "target": "Jessie", "type":"A"},
    {"source": "Sylvester", "target": "Helen", "type":"A"},
    {"source": "Helen", "target": "Gordon", "type":"A"},
    {"source": "Mary", "target": "Lillian", "type":"A"},
    {"source": "Ashton", "target": "Mary", "type":"A"},
    {"source": "Duncan", "target": "Jamie", "type":"A"},
    {"source": "Gordon", "target": "Jessie", "type":"A"},
    {"source": "Sylvester", "target": "Fray", "type":"E"},
    {"source": "Fray", "target": "Mauer", "type":"A"},
    {"source": "Fray", "target": "Cynthia", "type":"A"},
    {"source": "Fray", "target": "Percy", "type":"A"},
    {"source": "Percy", "target": "Cynthia", "type":"A"},
    {"source": "Infante", "target": "Duke", "type":"A"},
    {"source": "Duke", "target": "Gordon", "type":"A"},
    {"source": "Duke", "target": "Sylvester", "type":"A"},
    {"source": "Baron", "target": "Duke", "type":"A"},
    {"source": "Baron", "target": "Sylvester", "type":"E"},
    {"source": "Evette", "target": "Sylvester", "type":"E"},
    {"source": "Cynthia", "target": "Sylvester", "type":"E"},
    {"source": "Cynthia", "target": "Jamie", "type":"E"},
    {"source": "Mauer", "target": "Jessie", "type":"E"},
    {"source": "Duke", "target": "Lexy", "type":"A"},
    {"source": "Feyton", "target": "Lexy", "type":"A"},
    {"source": "Maria", "target": "Feyton", "type":"A"},
    {"source": "Baron", "target": "Yvette", "type":"E"},
    {"source": "Evette", "target": "Maria", "type":"E"},
    {"source": "Cynthia", "target": "Yvette", "type":"E"},
    {"source": "Maria", "target": "Jamie", "type":"E"},
    {"source": "Maria", "target": "Lesley", "type":"E"},
    {"source": "Ashley", "target": "Damo", "type":"A"},
    {"source": "Damo", "target": "Lexy", "type":"A"},
    {"source": "Maria", "target": "Feyton", "type":"A"},
    {"source": "Finkler", "target": "Ashley", "type":"E"},
    {"source": "Sylvester", "target": "Maria", "type":"E"},
    {"source": "Peter", "target": "Finkler", "type":"E"},
    {"source": "Ashley", "target": "Gordon", "type":"E"},
    {"source": "Maria", "target": "Imogen", "type":"E"}];

// Set up the simulation and add forces
var simulation = d3.forceSimulation()
                    .nodes(nodes_data);

var link_force =  d3.forceLink(links_data)
                        .id(function(d) { return d.id; });

var charge_force = d3.forceManyBody()
    .strength(-200);

var center_force = d3.forceCenter(width / 2, height / 2);

simulation
    .force("charge_force", charge_force)
    .force("center_force", center_force)
    .force("links",link_force);


// Add tick instructions:
simulation.on("tick", tickActions );

// Add encompassing group for the zoom
var g = svg.append("g")
    .attr("class", "everything");

// Draw lines for the links
var link = g.append("g")
        .attr("class", "links")
            .selectAll("line")
            .data(links_data)
            .enter()
                .append("line")
                    .attr("stroke-width", 2)
                    .style("stroke", linkColour);

// Draw circles and texts for the nodes
var nodes = g.append("g")
        .attr("class", "nodes");

var node = nodes.selectAll("node")
        .data(nodes_data)
        .enter()
            .append("node");

var circle = node.append("circle")
        .attr("r", radius)
        .attr("fill", circleColour)
        .attr("cx", function(d){return d.x})
        .attr("cy", function(d){return d.y});

var text = node.append("text")
        .text("asdasdasdas")
        .attr("cx", function(d){return d.x})
        .attr("cy", function(d){return d.y});

// Add drag capabilities
var drag_handler = d3.drag()
    .on("start", drag_start)
    .on("drag", drag_drag)
    .on("end", drag_end);

drag_handler(node);

// Add zoom capabilities
var zoom_handler = d3.zoom()
    .on("zoom", zoom_actions);

zoom_handler(svg);

/** Functions **/

function circleColour(d){
    if(d.sex == "M"){
        return "blue";
    } else {
        return "pink";
    }
}

// Function to choose the line colour and thickness
function linkColour(d){
    return "black";
}

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

// Make sure you can't drag the circle outside the box
function drag_drag(d) {
  d.fx = d3.event.x;
  d.fy = d3.event.y;
}

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

// Zoom functions
function zoom_actions(){
    g.attr("transform", d3.event.transform)
}

function tickActions() {
    // update node positions each tick of the simulation
    node
        .attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });

    // update link positions
    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; });
  }

Answer 1

您的代码中存在三个问题：

1. 没有名为 的 SVG 元素<node>。因此，而不是...

   .append("node");
   

   ... 它应该是：

   .append("g");
   

2. 文本元素没有cxorcy属性。

3. 您不必更改cxor cyof node，它没有任何内容（因为它是一个<g>元素），您必须翻译它：

   node.attr("transform", function(d) {
       return "translate(" + d.x + "," + d.y + ")"
   });
   

总而言之，这是您更新的代码：

.append("node");

.append("g");