d3js 移动节点旁边的标签

分类：编程问答

如何解决d3js 移动节点旁边的标签

我正在开发一个关于通过图形表示模式的项目。我是来从 json 中检索数据以生成图形并定位与节点关联的标签（我也想定位与链接对应的标签）。但是，在移动节点时，我无法移动标签。有什么帮助吗？ See the code here：

var width = 960,height = 500,resolution = 150,r = 15;

var graph = {
    "nodes":  [
        {"task": "1","label": "1","social": "I","id": 1,"x": 150,"y": 450},{"task": "2","label": "2","social": "G","id": 2,"x": 300,"y": 150},{"task": "3","label": "3","social": "T","id": 3,"x": 450,"y": 300}
        ],"links": [
        {"source": "1","target": "2","type": "N:1"},{"source": "2","target": "3","type": "1:N"},{"source": "1","type": "1:1"}
        ]
}

var margin = {
    top: -5,right: -5,bottom: -5,left: -5
};

var colors = d3.scale.category20();

var svg = d3.select('body').append('svg')
    .attr('width',width)
    .attr('height',height);

var force = d3.layout.force()
    .charge(-200)
    .linkDistance(50)
    .size([width + margin.left + margin.right,height + margin.top + margin.bottom])
    .nodes(graph.nodes);

var drag = d3.behavior.drag()
    .origin(function(d) { return d; })
    .on('drag',dragged);

svg.selectAll('.vertical')
    .data(d3.range(1,width / resolution))
    .enter().append('line')
    .attr('class','vertical')
    .attr('x1',function(d) { return d * resolution; })
    .attr('y1',0)
    .attr('x2',function(d) { return d * resolution; })
    .attr('y2',height);

svg.selectAll('.horizontal')
    .data(d3.range(1,height / resolution))
    .enter().append('line')
    .attr('class','horizontal')
    .attr('x1',0)
    .attr('y1',function(d) { return d * resolution; })
    .attr('x2',width)
    .attr('y2',function(d) { return d * resolution; });

svg.append('defs').append('marker')
    .attr({'id':'arrowhead','viewBox':'-0 -5 10 10','refX':25,'refY':0,'orient':'auto','markerWidth':5,'markerHeight':5,'xoverflow':'visible'})
    .append('svg:path')
    .attr('d','M 0,-5 L 10,0 L 0,5')
    .attr('fill','#777')
    .style('stroke','none');


var link = svg.selectAll("svg.link")
    .data(graph.links)
    .enter().append("line")
    .attr("class","link")
    .attr('marker-end','url(#arrowhead)')

    .attr("data-source",function (d) {
          return d.source;
        })
    .attr("data-target",function (d) {
          return d.target;
        })
    .attr("x1",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.source)
                return node.x;
        }
    })
    .attr("x2",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.target)
                return node.x;
        }
    })
    .attr("y1",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.source)
                return node.y;
        }
    })
    .attr("y2",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.target)
                return node.y;
        }
    })
    .style("stroke-width",function(d) {
        return Math.sqrt(d.value);
});

var node = svg.selectAll("svg.node")
    .data(graph.nodes)
    .enter().append('g');

node.append("circle")
    .attr("class","node")
    .attr('cx',function(d) { return d.x; })
    .attr('cy',function(d) { return d.y; })
    .attr('r',r)
    .call(drag);//
    
//text element
node.append("title")
    .text(function (d) {return d.social});

node.append("text")
    //.attr("dx",)
    //.attr("dy",6)
    .attr("class","font")
    .attr('dx',function(d) { return d.x-6; })
    .attr('dy',function(d) { return d.y+6; })
    .text(function(d) { return d.social; });

force.on("tick",function () {
    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("transform",function(d) { return "translate(" + d.x + "," + d.y + ")"; });

});

function dragged(d) {
  var x = d3.event.x,y = d3.event.y,gridX = round(Math.max(r,Math.min(width - r,x)),resolution),gridY = round(Math.max(r,Math.min(height - r,y)),resolution);

      d3.select(this).attr('cx',d.x = gridX).attr('cy',d.y = gridY);
      d3.select(this).attr('dx',d.x = gridX).attr('dy',d.y = gridY);

      d3.selectAll(`[data-source='${d.task}']`).attr('x1',d.x).attr('y1',d.y);
      d3.selectAll(`[data-target='${d.task}']`).attr('x2',d.x).attr('y2',d.y);
}

function round(p,n) {
  return p % n < n / 2 ? p - (p % n) : p + n - (p % n);
}
.node {
    fill:#ccc;
    stroke: #fff;
    stroke-width: 2px;
}
.node-active {
    stroke: #555;
    stroke-width: 1.5px;
}
link-active {
    stroke: #555;
    stroke-opacity: 5;
}
line {
  stroke: rgb(212,212,212);
  stroke-width: 1px;
  shape-rendering: crispEdges;
}
.overlay {
    fill: none;
    pointer-events: all;
}
.link{
    stroke: #ccc;
    stroke-width: 2px;
    }
svg {
  box-sizing: border-box;
  border: 1px solid rgb(212,212);
}
 <!DOCTYPE html>
<html>
<head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>[D3]</title>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <meta name="robots" content="noindex,nofollow">
  <meta name="googlebot" content="noindex,nofollow">
  <meta name="viewport" content="width=device-width,initial-scale=1">
  
  <body>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</body>

解决方法

向 <circle> 和 <text> 元素添加标识属性：

...attr('node-id',d => d.social)

随着圆圈移动文本：

d3.select(`text[node-id='${d.social}']`).attr('dx',d.x).attr('dy',d.y)

对 <text> 标签使用文本锚和对齐基线而不是偏移量 (+6/-6)：

...attr('text-anchor','middle')
  .attr('alignment-baseline','middle')
  .attr('dx',function(d) { return d.x; })
  .attr('dy',function(d) { return d.y; })

我还放大了 <circle> 以使其易于拖动...

var width = 960,height = 500,resolution = 150,r = 15;

var graph = {
    "nodes":  [
        {"task": "1","label": "1","social": "I","id": 1,"x": 150,"y": 450},{"task": "2","label": "2","social": "G","id": 2,"x": 300,"y": 150},{"task": "3","label": "3","social": "T","id": 3,"x": 450,"y": 300}
        ],"links": [
        {"source": "1","target": "2","type": "N:1"},{"source": "2","target": "3","type": "1:N"},{"source": "1","type": "1:1"}
        ]
}

var margin = {
    top: -5,right: -5,bottom: -5,left: -5
};

var colors = d3.scale.category20();

var svg = d3.select('body').append('svg')
    .attr('width',width)
    .attr('height',height);

var force = d3.layout.force()
    .charge(-200)
    .linkDistance(50)
    .size([width + margin.left + margin.right,height + margin.top + margin.bottom])
    .nodes(graph.nodes);

var drag = d3.behavior.drag()
    .origin(function(d) { return d; })
    .on('drag',dragged);

svg.selectAll('.vertical')
    .data(d3.range(1,width / resolution))
    .enter().append('line')
    .attr('class','vertical')
    .attr('x1',function(d) { return d * resolution; })
    .attr('y1',0)
    .attr('x2',function(d) { return d * resolution; })
    .attr('y2',height);

svg.selectAll('.horizontal')
    .data(d3.range(1,height / resolution))
    .enter().append('line')
    .attr('class','horizontal')
    .attr('x1',0)
    .attr('y1',function(d) { return d * resolution; })
    .attr('x2',width)
    .attr('y2',function(d) { return d * resolution; });

svg.append('defs').append('marker')
    .attr({'id':'arrowhead','viewBox':'-0 -5 10 10','refX':40,'refY':0,'orient':'auto','markerWidth':5,'markerHeight':5,'xoverflow':'visible'})
    .append('svg:path')
    .attr('d','M 0,-5 L 10,0 L 0,5')
    .attr('fill','#777')
    .style('stroke','none');


var link = svg.selectAll("svg.link")
    .data(graph.links)
    .enter().append("line")
    .attr("class","link")
    .attr('marker-end','url(#arrowhead)')

    .attr("data-source",function (d) {
          return d.source;
        })
    .attr("data-target",function (d) {
          return d.target;
        })
    .attr("x1",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.source)
                return node.x;
        }
    })
    .attr("x2",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.target)
                return node.x;
        }
    })
    .attr("y1",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.source)
                return node.y;
        }
    })
    .attr("y2",function (d) {
        for (let node of graph.nodes) {
            if (node.task === d.target)
                return node.y;
        }
    })
    .style("stroke-width",function(d) {
        return Math.sqrt(d.value);
});

var node = svg.selectAll("svg.node")
    .data(graph.nodes)
    .enter().append('g');

node.append("circle")
    .attr("class","node")
    .attr('node-id',d => d.social)
    .attr('cx',function(d) { return d.x; })
    .attr('cy',function(d) { return d.y; })
    .attr('r',r * 2)
    .call(drag);//
    
node.append("text")
    .attr("class","label")
    .attr('node-id',d => d.social)
    .attr('text-anchor','middle')
    .attr('alignment-baseline','middle')
    .attr('dx',function(d) { return d.x; })
    .attr('dy',function(d) { return d.y; })
    .text(function(d) { return d.social; });

force.on("tick",function () {
    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("transform",function(d) { return "translate(" + d.x + "," + d.y + ")"; });

});

function dragged(d) {
  var x = d3.event.x,y = d3.event.y,gridX = round(Math.max(r,Math.min(width - r,x)),resolution),gridY = round(Math.max(r,Math.min(height - r,y)),resolution);

      d3.select(this).attr('cx',d.x = gridX).attr('cy',d.y = gridY);
      d3.select(this).attr('dx',d.x = gridX).attr('dy',d.y = gridY);

      d3.selectAll(`[data-source='${d.task}']`).attr('x1',d.x).attr('y1',d.y);
      d3.selectAll(`[data-target='${d.task}']`).attr('x2',d.x).attr('y2',d.y);
      d3.select(`text[node-id='${d.social}']`).attr('dx',d.y)
}

function round(p,n) {
  return p % n < n / 2 ? p - (p % n) : p + n - (p % n);
}
.node {
    fill:#ccc;
    stroke: #fff;
    stroke-width: 2px;
}
.node-active {
    stroke: #555;
    stroke-width: 1.5px;
}
link-active {
    stroke: #555;
    stroke-opacity: 5;
}
line {
  stroke: rgb(212,212,212);
  stroke-width: 1px;
  shape-rendering: crispEdges;
}
.overlay {
    fill: none;
    pointer-events: all;
}
.link{
    stroke: #ccc;
    stroke-width: 2px;
    }
svg {
  box-sizing: border-box;
  border: 1px solid rgb(212,212);
}
 <!DOCTYPE html>
<html>
<head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>[D3]</title>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <meta name="robots" content="noindex,nofollow">
  <meta name="googlebot" content="noindex,nofollow">
  <meta name="viewport" content="width=device-width,initial-scale=1">
  
  <body>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</body>

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