效果图

代码

<template>
  <div class="app">
    <div ref="myholder" id="paper"></div>
  </div>
</template>

<script>
import * as joint from '@joint/core'
import $ from 'jquery'
export default {
  data() {
    return {
      graph: null,
    }
  },
  mounted() {
    const namespace = joint.shapes
    var graph = new joint.dia.Graph({}, { cellNamespace: namespace })
    this.graph = graph

    var paper = new joint.dia.Paper({
      el: this.$refs.myholder,
      model: this.graph,
      width: 800,
      height: 300,
      cellViewNamespace: namespace,
      drawGrid: true,
      gridSize: 10,
      background: {
        color: 'rgba(0, 255, 0, 0.3)',
      },
      // 禁止交互
      interactive: false, // disable default interaction (e.g. dragging)
      // 当mousemove事件的数量超过clickThreshold时，在mouseup之后不会触发pointerclick事件
      clickThreshold: 10,
    })

    this.paper = paper

    const node1 = this.drawRect({ x: 50, y: 30 }, '节点1')
    const node2 = this.drawRect({ x: 200, y: 30 }, '节点2')
    const node3 = this.drawRect({ x: 350, y: 30 }, '节点3')
    const node4 = this.drawRect({ x: 500, y: 30 }, '节点4')
    // const node5 = this.drawRect({ x: 50, y: 100 }, '流程-1.1')
    const node6 = this.drawRect({ x: 350, y: 100 }, '节点6')
    const node7 = this.drawRect({ x: 350, y: 150 }, '流程-2.2')

    //  自定义路径点
    const path_points = new joint.g.Path(
      'M 300 50 L 325 50 L 325 120 L 350 120'
    ).segments
    const points = path_points.map((item) => item.end)

    const path_points_2 = new joint.g.Path(
      'M 300 50 L 325 50 L 325 120 L 325 170 L 350 170'
    ).segments
    const points_2 = path_points_2.map((item) => item.end)

    const node2_to_node6_vetices = [...points]
    const node2_to_node7_vetices = [...points_2]

    this.drawLine(node1, node2)
    this.drawLine(node2, node3)
    this.drawLine(node3, node4)
    // this.drawLine(node1, node5)
    this.drawLine(node2, node6, node2_to_node6_vetices)
    this.drawLine(node2, node7, node2_to_node7_vetices)
  },
  methods: {
    drawRect({ x, y }, text) {
      var rect = new joint.shapes.standard.Rectangle()
      rect.position(x, y)
      rect.resize(100, 40)
      rect.attr({
        // body选择器修改的是 svg元素  [selector for the <rect> SVGElement]
        body: {
          fill: '#2c3e50',

          // strokeWidth: 0,
          // strokeDasharray: '10,2',
          // fill: 'transparent',
          // stroke: 'transparent',
        },

        // label选择器修改的是 text元素  [selector for the <text> SVGElement]
        label: {
          text,
          fill: '#3498DB',
          fontSize: 18,
          fontWeight: 'bold',
          fontVariant: 'Microsoft YaHei',
        },
      })
      rect.addTo(this.graph)

      // this.transformHtml(rect, text)
      return rect
    },
    // vertices 数组，从起始点到终点是否需要绕行  [https://resources.jointjs.com/tutorial/links]
    drawLine(node1, node2, vertices) {
      var link = new joint.shapes.standard.Link()
      link.source(node1)
      link.target(node2)
      link.addTo(this.graph)

      if (vertices && vertices.length) {
        link.vertices(vertices)
        // 注意：下面不能使用，使用下面后路径会自动去计算
        // link.router('orthogonal')
        // link.connector('rounded')
      }
      link.attr({
        line: {
          stroke: 'gray',
        },
      })
    },
    transformHtml(element, text) {
      var bbox = element.getBBox()
      // NOTE:重点方法  绘制一个html元素在element元素之上
      //  Draw an HTML rectangle above the element.
      var clientRect1 = this.paper.localToClientRect(bbox)
      var div = document.createElement('div')
      div.style.position = 'fixed'
      div.style.background = 'red'
      div.style.left = clientRect1.x + 'px'
      div.style.top = clientRect1.y + 'px'
      div.style.width = clientRect1.width + 'px'
      div.style.height = clientRect1.height + 'px'
      div.innerHTML = `<span class='yellow'>${text}</span>`
      $(div).click(function () {
        console.log(this)
      })
      this.paper.el.appendChild(div)
    },
  },
}
</script>

<style lang="less" scoped>
#paper {
  border: 1px solid;
}

/deep/.yellow {
  color: yellow;
}
</style>