使用joinjs繪製流程圖（七）-實戰-繪製流程圖+節點設定樣式+節點新增事件

效果圖

原理

joinjs中透過svg來繪製流程圖，然後我們可以使用localToClientRect這個方法對節點（element）複製，它會在原來的element在svg位置上生成一個html元素，但是這樣會造成原來的element節點監聽的點選事件無法觸發，我們可以使用原生來操作對這個元素（比如樣式的設定和事件的監聽）

程式碼

<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)',
      },
      // 禁止互動
      interactive: false, // disable default interaction (e.g. dragging)
      // 當mousemove事件的數量超過clickThreshold時，在mouseup之後不會觸發pointerclick事件
      clickThreshold: 10,
    })

    this.paper = paper

    // const element = new joint.shapes.standard.Rectangle()
    // element.position(100, 50)
    // element.resize(100, 40)
    // element.addTo(this.graph)

    // Draw an HTML rectangle above the element.
    // var bbox = element.getBBox()
    // var clientRect1 = 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'>哈哈哈</span>`
    // $(div).click(() => {
    //   console.log('發生了點選')
    // })
    // paper.el.appendChild(div)

    // 整合
    const node1 = this.drawRect({ x: 50, y: 30 }, '流程-1')
    const node2 = this.drawRect({ x: 200, y: 30 }, '流程-2')
    const node3 = this.drawRect({ x: 350, y: 30 }, '流程-3')
    const node4 = this.drawRect({ x: 500, y: 30 }, '流程-4')
    const node5 = this.drawRect({ x: 50, y: 100 }, '流程-1.1')
    const node6 = this.drawRect({ x: 350, y: 100 }, '流程-2.1')
    const node7 = this.drawRect({ x: 350, y: 150 }, '流程-2.2')

    const node2_to_node6_vetices = [new joint.g.Point(250, 100)]
    const node2_to_node7_vetices = [new joint.g.Point(250, 150)]

    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: {
          fill: '#2c3e50',
        },
        label: {
          text,
          fill: '#3498DB',
          fontSize: 18,
          fontWeight: 'bold',
          fontVariant: 'Microsoft YaHei',
        },
      })
      rect.addTo(this.graph)

      this.transformHtml(rect, text)
      return rect
    },
    drawLine(node1, node2, vertices) {
      var link = new joint.shapes.standard.Link()
      link.source(node1)
      link.target(node2)
      link.addTo(this.graph)

      if (vertices) {
        link.vertices(vertices)
        link.router('orthogonal')
        // link.connector('rounded')
      }
      // link.vertices([
      //   new joint.g.Point(250, 100),
      //   new joint.g.Point(280, 100),
      //   new joint.g.Point(300, 120),
      // ])
      //
      link.attr({
        line: {
          stroke: 'gray',
        },
      })
    },
    transformHtml(element, text) {
      var bbox = element.getBBox()
      // NOTE:重點方法  繪製一個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>