D3.js实现拓扑图的示例代码

const fontSize = 10;
const symbolSize = 40;
const padding = 10;

/*
* 调用 new Togo(svg,option).render();
* */
class Togo {
 /**/
 constructor(svg, option) {
  this.data = option.data;
  this.edges = option.edges;
  this.svg = d3.select(svg);

 }

 //主渲染方法
 render() {
  this.scale = 1;
  this.width');
  this.height');
  this.container = this.svg.append('g')
  .attr('transform', 'scale(' + this.scale + ')');


  this.initPosition();
  this.initDefineSymbol();
  this.initLink();
  this.initNode();
  this.initZoom();

 }

 //初始化节点位置
 initPosition() {
  let origin = [this.width / 2, this.height / 2];
  let points = this.getVertices(origin, Math.min(this.width, this.height) * 0.3, this.data.length);
  this.data.forEach((item, i) => {
   item.x = points[i].x;
   item.y = points[i].y;
  })
 }

 //根据多边形获取定位点
 getVertices(origin, r, n) {
  if (typeof n !== 'number') return;
  var ox = origin[0];
  var oy = origin[1];
  var angle = 360 / n;
  var i = 0;
  var points = [];
  var tempAngle = 0;
  while (i < n) {
   tempAngle = (i * angle * Math.PI) / 180;
   points.push({
    x: ox + r * Math.sin(tempAngle),
    y: oy + r * Math.cos(tempAngle),
   });
   i++;
  }
  return points;
 }

 //两点的中心点
 getCenter(x1, y1, x2, y2) {
  return [(x1 + x2) / 2, (y1 + y2) / 2]
 }

 //两点的距离
 getDistance(x1, y1, x2, y2) {
  return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
 }

 //两点角度
 getAngle(x1, y1, x2, y2) {
  var x = Math.abs(x1 - x2);
  var y = Math.abs(y1 - y2);
  var z = Math.sqrt(x * x + y * y);
  return Math.round((Math.asin(y / z) / Math.PI * 180));
 }


 //初始化缩放器
 initZoom() {
  let self = this;
  let zoom = d3.zoom()
  .scaleExtent([0.7, 3])
  .on('zoom', function () {
   self.onZoom(this)
  });
  this.svg.call(zoom)
 }

 //初始化图标
 initDefineSymbol() {
  let defs=this.container.append('svg:defs');

  //箭头
  const marker = defs
  .selectAll('marker')
  .data(this.edges)
  .enter()
  .append('svg:marker')
  .attr('id', (link, i) => 'marker-' + i)
  .attr('markerUnits', 'userSpaceOnUse')
  .attr('viewBox', '0 -5 10 10')
  .attr('refX', symbolSize / 2 + padding)
  .attr('refY', 0)
  .attr('markerWidth', 14)
  .attr('markerHeight', 14)
  .attr('orient', 'auto')
  .attr('stroke-width', 2)
  .append('svg:path')
  .attr('d', 'M2,0 L0,-3 L9,0 L0,3 M2,0 L0,-3')
  .attr('class','arrow')


  //数据库
  let database =defs.append('g')
   .attr('id','database')
  .attr('transform','scale(0.042)');

  database.append('path')
  .attr('d','M512 800c-247.42 0-448-71.63-448-160v160c0 88.37 200.58 160 448 160s448-71.63 448-160V640c0 88.37-200.58 160-448 160z')

  database.append('path')
  .attr('d','M512 608c-247.42 0-448-71.63-448-160v160c0 88.37 200.58 160 448 160s448-71.63 448-160V448c0 88.37-200.58 160-448 160z') ;

  database.append('path')
  .attr('d','M512 416c-247.42 0-448-71.63-448-160v160c0 88.37 200.58 160 448 160s448-71.63 448-160V256c0 88.37-200.58 160-448 160z') ;

  database.append('path')
  .attr('d','M64 224a448 160 0 1 0 896 0 448 160 0 1 0-896 0Z');

  //云
  let cloud=defs.append('g')
  .attr('id','cloud')
  .attr('transform','scale(0.042)')
  .append('path')
  .attr('d','M709.3 285.8C668.3 202.7 583 145.4 484 145.4c-132.6 0-241 102.8-250.4 233-97.5 27.8-168.5 113-168.5 213.8 0 118.9 98.8 216.6 223.4 223.4h418.9c138.7 0 251.3-118.8 251.3-265.3 0-141.2-110.3-256.2-249.4-264.5z')



 }

 //初始化链接线
 initLink() {
  this.drawLinkLine();
  this.drawLinkText();
 }

 //初始化节点
 initNode() {
  var self = this;
  //节点容器
  this.nodes = this.container.selectAll(".node")
  .data(this.data)
  .enter()
  .append("g")
  .attr("transform", function (d) {
   return "translate(" + d.x + "," + d.y + ")";
  })
  .call(d3.drag()
   .on("drag", function (d) {
    self.onDrag(this, d)
   })
  )
  .on('click', function () {
   alert()
  })

  //节点背景默认覆盖层
  this.nodes.append('circle')
  .attr('r', symbolSize / 2 + padding)
  .attr('class', 'node-bg');

  //节点图标
  this.drawNodeSymbol();
  //节点标题
  this.drawNodeTitle();
  //节点其他说明
  this.drawNodeOther();
  this.drawNodeCode();

 }

 //画节点语言标识
 drawNodeCode() {
  this.nodeCodes = this.nodes.filter(item => item.type == 'app')
  .append('g')
  .attr('class','node-code')
  .attr('transform', 'translate(' + -symbolSize / 2 + ',' + symbolSize / 3 + ')')

  this.nodeCodes
  .append('circle')
  .attr('r', d => fontSize / 2 * d.code.length / 2 + 3)

  this.nodeCodes
  .append('text')
  .attr('dy', fontSize / 2)
  .text(item => item.code);

 }

 //画节点图标
 drawNodeSymbol() {
  //绘制节点
  this.nodes.filter(item=>item.type=='app')
  .append("circle")
  .attr("r", symbolSize / 2)
  .attr("fill", '#fff')
  .attr('class', function (d) {
   return 'health'+d.health;
  })
  .attr('stroke-width', '5px')


  this.nodes.filter(item=>item.type=='database')
  .append('use')
  .attr('xlink:href','#database')
  .attr('x',function () {
   return -this.getBBox().width/2
  })
  .attr('y',function () {
   return -this.getBBox().height/2
  })

  this.nodes.filter(item=>item.type=='cloud')
  .append('use')
  .attr('xlink:href','#cloud')
  .attr('x',function () {
   return -this.getBBox().width/2
  })
  .attr('y',function () {
   return -this.getBBox().height/2
  })
 }

 //画节点右侧信息
 drawNodeOther() {
  //如果是应用的时候
  this.nodeOthers = this.nodes.filter(item => item.type == 'app')
  .append("text")
  .attr("x", symbolSize / 2 + padding)
  .attr("y", -5)
  .attr('class','node-other')

  this.nodeOthers.append('tspan')
  .text(d => d.time + 'ms');

  this.nodeOthers.append('tspan')
  .text(d => d.rpm + 'rpm')
  .attr('x', symbolSize / 2 + padding)
  .attr('dy', '1em');

  this.nodeOthers.append('tspan')
  .text(d => d.epm + 'epm')
  .attr('x', symbolSize / 2 + padding)
  .attr('dy', '1em')
 }

 //画节点标题
 drawNodeTitle() {
  //节点标题
  this.nodes.append("text")
  .attr('class','node-title')
  .text(function (d) {
   return d.name;
  })
  .attr("dy", symbolSize)

  this.nodes.filter(item => item.type == 'app').append("text")
  .text(function (d) {
   return d.active + '/' + d.total;
  })
  .attr('dy', fontSize / 2)
  .attr('class','node-call')

 }

 //画节点链接线
 drawLinkLine() {
  let data = this.data;
  if (this.lineGroup) {
   this.lineGroup.selectAll('.link')
   .attr(
    'd', link => genLinkPath(link),
   )
  } else {
   this.lineGroup = this.container.append('g')


   this.lineGroup.selectAll('.link')
   .data(this.edges)
   .enter()
   .append('path')
   .attr('class', 'link')
   .attr(
    'marker-end', (link, i) => 'url(#' + 'marker-' + i + ')'
   ).attr(
    'd', link => genLinkPath(link),
   ).attr(
    'id', (link, i) => 'link-' + i
   )
   .on('click', () => { alert() })
  }

  function genLinkPath(d) {
   let sx = data[d.source].x;
   let tx = data[d.target].x;
   let sy = data[d.source].y;
   let ty = data[d.target].y;
   return 'M' + sx + ',' + sy + ' L' + tx + ',' + ty;
  }
 }


 drawLinkText() {
  let data = this.data;
  let self = this;
  if (this.lineTextGroup) {
   this.lineTexts
   .attr('transform', getTransform)

  } else {
   this.lineTextGroup = this.container.append('g')

   this.lineTexts = this.lineTextGroup
   .selectAll('.linetext')
   .data(this.edges)
   .enter()
   .append('text')
   .attr('dy', -2)
   .attr('transform', getTransform)
   .on('click', () => { alert() })

   this.lineTexts
   .append('tspan')
   .text((d, i) => this.data[d.source].lineTime + 'ms,' + this.data[d.source].lineRpm + 'rpm');

   this.lineTexts
   .append('tspan')
   .text((d, i) => this.data[d.source].lineProtocol)
   .attr('dy', '1em')
   .attr('dx', function () {
    return -this.getBBox().width / 2
   })
  }

  function getTransform(link) {
   let s = data[link.source];
   let t = data[link.target];
   let p = self.getCenter(s.x, s.y, t.x, t.y);
   let angle = self.getAngle(s.x, s.y, t.x, t.y);
   if (s.x > t.x && s.y < t.y || s.x < t.x && s.y > t.y) {
    angle = -angle
   }
   return 'translate(' + p[0] + ',' + p[1] + ') rotate(' + angle + ')'
  }
 }


 update(d) {
  this.drawLinkLine();
  this.drawLinkText();
 }

 //拖拽方法
 onDrag(ele, d) {
  d.x = d3.event.x;
  d.y = d3.event.y;
  d3.select(ele)
  .attr('transform', "translate(" + d3.event.x + "," + d3.event.y + ")")
  this.update(d);
 }

 //缩放方法
 onZoom(ele) {
  var transform = d3.zoomTransform(ele);
  this.scale = transform.k;
  this.container.attr('transform', "translate(" + transform.x + "," + transform.y + ")scale(" + transform.k + ")")
 }

}

let __options={
 data:[{
  type:'app',
  name: 'monitor-web-server',
  time: 30,
  rpm: 40,
  epm: 50,
  active: 3,
  total: 5,
  code: 'java',
  health: 1,
  lineProtocol: 'http',
  lineTime: 12,
  lineRpm: 34,
 }, {
  type:'database',
  name: 'Mysql',
  time: 30,
  rpm: 40,
  epm: 50,
  active: 3,
  total: 5,
  code: 'java',
  health: 2,
  lineProtocol: 'http',
  lineTime: 12,
  lineRpm: 34,

 },
  {
   type:'app',
   name: 'Redis',
   time: 30,
   rpm: 40,
   epm: 50,
   active: 3,
   total: 5,
   code: 'java',
   health: 3,
   lineProtocol: 'http',
   lineTime: 12,
   lineRpm: 34,

  }, {
   type:'cloud',
   name: 'ES',
   time: 30,
   rpm: 40,
   epm: 50,
   active: 3,
   total: 5,
   code: 'java',
   health: 1,
   lineProtocol: 'http',
   lineTime: 12,
   lineRpm: 34,
   value: 100
  }
 ],
 edges: [
   {
   source: 0,
   target: 3,
  }, {
   source: 1,
   target: 2,
  }
  , {
   source: 1,
   target: 3,
  },
  {
   source: 0,
   target: 1,
  },
  {
   source: 0,
   target: 2,
  }
  // {
  //  source: 3,
  //  target: 2,
  // },
 ]
}