绘制流程图

技术
字数统计: 2k   |   阅读时长≈ 10 分钟

场景：不同的审批流程，对应不同的流程图。通过动态获取流程数据，动态绘制流程图

流程数据类似于：

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[
  {
    "nextname": "公司领导审批",
    "currNodeCode": "377",
    "id": 21256,
    "currname": "业务管理中心领导审批",
    "nextNodeCode": "389"
  },
  {
    "nextname": "部门科室主管或县市部门领导审批",
    "currNodeCode": "999",
    "id": 21260,
    "currname": "退回发起人",
    "nextNodeCode": "102"
  },
  {
    "nextname": "发起人确认",
    "currNodeCode": "389",
    "id": 21262,
    "currname": "公司领导审批",
    "nextNodeCode": "108"
  },
  {
    "nextname": "部门科室主管或县市部门领导审批",
    "currNodeCode": "100",
    "id": 21245,
    "currname": "发起人申请",
    "nextNodeCode": "102"
  },
  {
    "nextname": "政企部内分管领导",
    "currNodeCode": "441",
    "id": 21251,
    "currname": "政企业务接口人",
    "nextNodeCode": "442"
  },
  {
    "nextname": "业务管理中心领导审批",
    "currNodeCode": "442",
    "id": 21253,
    "currname": "政企部内分管领导",
    "nextNodeCode": "377"
  },
  {
    "nextname": "发起人确认",
    "currNodeCode": "377",
    "id": 21255,
    "currname": "业务管理中心领导审批",
    "nextNodeCode": "108"
  },
  {
    "nextname": "流程正常归档",
    "currNodeCode": "108",
    "id": 21258,
    "currname": "发起人确认",
    "nextNodeCode": "888"
  },
  {
    "nextname": "部门分管领导审批",
    "currNodeCode": "102",
    "id": 21246,
    "currname": "部门科室主管或县市部门领导审批",
    "nextNodeCode": "153"
  },
  {
    "nextname": "发起人确认",
    "currNodeCode": "153",
    "id": 21248,
    "currname": "部门分管领导审批",
    "nextNodeCode": "108"
  },
  {
    "nextname": "政企业务接口人",
    "currNodeCode": "153",
    "id": 21249,
    "currname": "部门分管领导审批",
    "nextNodeCode": "441"
  }
]

主要功能点：自动生成流程节点、自动排列、点击全屏查看、缩放、整体拖动

主要技术：@antv/x6 和@antv/layout

一、安装插件

@antv/x6 使用的是 2.18.1 版本，@antv/layout 对应的需要手动选择 0.3.25 版本，而不是最新版。否则其 layout 会报错，这是插件本身版本的问题

完整代码如下

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<template>
  <div class="flow-chart-container">
    <div ref="container" class="flow-chart" @click="openFullscreen"></div>
    <!-- 全屏预览模态框 -->
    <div
      v-if="isFullscreen"
      class="fullscreen-preview"
      @click.self="closeFullscreen"
    >
      <div class="preview-content">
        <div ref="fullscreenContainer" class="fullscreen-chart"></div>
        <div class="preview-toolbar">
          <el-button @click="zoomIn" circle
            ><el-icon> <ZoomIn /> </el-icon
          ></el-button>
          <el-button @click="zoomOut" circle
            ><el-icon> <ZoomOut /> </el-icon
          ></el-button>
          <el-button @click="zoomToFit" circle
            ><el-icon> <FullScreen /> </el-icon
          ></el-button>
          <el-button @click="closeFullscreen" circle
            ><el-icon> <Close /> </el-icon
          ></el-button>
          <span class="zoom-level">{{ zoomPercentage }}%</span>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { Graph } from '@antv/x6'
import { DagreLayout } from '@antv/layout'
import { ref, defineProps, onMounted, watch, computed, nextTick } from 'vue'
import { ZoomIn, ZoomOut, FullScreen, Close } from '@element-plus/icons-vue'
const props = defineProps({
  flowData: {
    type: Array,
    default: () => [],
  },
})
const fullscreenContainer = ref(null)
const isFullscreen = ref(false)
const fullscreenGraph = ref(null)
const currentZoom = ref(1)
const zoomPercentage = computed(() => {
  return Math.round(currentZoom.value * 100)
})
// 初始化全屏视图的图表
const initFullscreenGraph = () => {
  if (!fullscreenContainer.value) return

  fullscreenGraph.value = new Graph({
    container: fullscreenContainer.value,
    history: false,
    selecting: { enabled: true },
    panning: {
      enabled: true,
    },
    mousewheel: {
      enabled: true,
      minScale: 0.2,
      maxScale: 3,
    },
    background: { color: '#f5f5f5' },
  })

  // 监听缩放事件
  fullscreenGraph.value.on('scale', ({ sx }) => {
    currentZoom.value = sx
  })

  renderGraph(fullscreenGraph.value)
  fullscreenGraph.value.zoomToFit({ padding: 20 })
}
// 打开全屏预览
const openFullscreen = () => {
  isFullscreen.value = true
  nextTick(() => {
    initFullscreenGraph()
  })
}

// 关闭全屏预览
const closeFullscreen = () => {
  isFullscreen.value = false
  if (fullscreenGraph.value) {
    fullscreenGraph.value.dispose()
    fullscreenGraph.value = null
  }
}

// 缩放控制
const zoomIn = () => {
  if (fullscreenGraph.value) {
    const current = fullscreenGraph.value.zoom()
    const newZoom = Math.min(current + 0.2, 3)
    fullscreenGraph.value.zoomTo(newZoom)
  }
}

const zoomOut = () => {
  if (fullscreenGraph.value) {
    const current = fullscreenGraph.value.zoom()
    const newZoom = Math.max(current - 0.2, 0.2)
    fullscreenGraph.value.zoomTo(newZoom)
  }
}

const zoomToFit = () => {
  if (fullscreenGraph.value) {
    fullscreenGraph.value.zoomToFit({ padding: 20 })
  }
}
function processFlowData(flowData) {
  const nodes = []
  const edges = []
  const nodeMap = new Map()

  // 收集所有节点和边
  flowData.forEach((item) => {
    // 当前节点
    if (!nodeMap.has(item.curr_node_code)) {
      nodes.push({
        id: item.curr_node_code,
        label: item.curr,
        width: 120,
        height: 40,
      })
      nodeMap.set(item.curr_node_code, true)
    }

    // 下一个节点
    if (item.next_node_code && !nodeMap.has(item.next_node_code)) {
      nodes.push({
        id: item.next_node_code,
        label: item.nextn,
        width: item.nextn.length * 14,
        height: 40,
      })
      nodeMap.set(item.next_node_code, true)
    }

    // 添加边
    if (item.next_node_code) {
      edges.push({
        source: item.curr_node_code,
        target: item.next_node_code,
        labels: item.express_name ? [{ text: item.express_name }] : [],
      })
    }
  })

  const dagreLayout = new DagreLayout({
    type: 'dagre',
    rankdir: 'LR', // 布局方向：从左到右
    align: 'UL', // 对齐方式
    ranksep: 40, // 层级间距
    nodesep: 30, // 节点间距
    controlPoints: true, // 显示边控制点
  })

  const layoutData = dagreLayout.layout({
    nodes: nodes.map((node) => ({ ...node, size: [node.width, node.height] })),
    edges,
  })

  // 转换布局后的数据为X6格式
  return {
    nodes: layoutData.nodes.map((node) => ({
      id: node.id,
      x: node.x,
      y: node.y,
      label: node.label,
      type: 'rect',
      width: node.width,
      height: node.height,
      attrs: {
        body: {
          fill: '#fff',
          stroke: '#9254de',
          strokeWidth: 2,
          rx: 5,
          ry: 5,
        },
        label: {
          fontSize: 12,
          fill: '#333',
        },
      },
    })),
    edges: layoutData.edges.map((edge) => ({
      source: edge.source,
      target: edge.target,
      attrs: {
        line: {
          stroke: '#a0a0a0',
          strokeWidth: 2,
          targetMarker: {
            name: 'block',
            size: 6,
          },
        },
      },
      labels: edge.labels
        ? edge.labels.map((label) => ({
            attrs: {
              label: {
                text: label.text,
                fontSize: 10,
              },
            },
          }))
        : [],
    })),
  }
}
onMounted(() => {
  init()
})
watch(
  () => props.flowData,
  () => {
    renderGraph(graph.value)
    graph.value.zoomToFit({ padding: 20, maxScale: 1 })
  },
  { deep: true }
)
const container = ref(null)
const graph = ref(null)
const init = () => {
  if (!container.value) return
  graph.value = new Graph({
    container: container.value,
    history: false, // 禁用历史记录
    selecting: {
      enabled: false, // 禁用选择
      rubberband: false, // 禁用框选
    },
    panning: {
      enabled: true, // 启用平移
    },
    scroller: {
      enabled: false,
    },
    minimap: {
      enabled: true,
      container: container.value,
    },
    background: {
      color: '#ffff',
    },
    grid: {
      size: 10,
      visible: false,
    },
    interacting: {
      // 禁用交互
      nodeMovable: false, // 禁止节点移动
      edgeMovable: false, // 禁止边移动
      edgeLabelMovable: false, // 禁止边标签移动
      arrowheadMovable: false, // 禁止箭头移动
      vertexMovable: false, // 禁止顶点移动
      vertexAddable: false, // 禁止添加顶点
      vertexDeletable: false, // 禁止删除顶点
      useEdgeTools: false, // 禁止使用边工具
    },
  })

  renderGraph(graph.value)
  // 自动调整视图
  graph.value.zoomToFit({ padding: 20, maxScale: 1 })
}
const renderGraph = (graph) => {
  if (!graph) return

  graph.clearCells()
  const data = props.flowData.filter((item) => item.curr_node_code !== '999')
  const { nodes, edges } = processFlowData(data)

  // 添加节点
  nodes.forEach((node) => {
    graph.addNode({
      id: node.id,
      shape: node.type || 'rect',
      x: node.x,
      y: node.y,
      width: node.width,
      height: node.height,
      label: node.label,
      attrs: node.attrs,
    })
  })

  // 添加边
  edges.forEach((edge) => {
    graph.addEdge({
      source: edge.source,
      target: edge.target,
      attrs: edge.attrs,
      labels: edge.labels,
      // connector: 'rounded',
      router: {
        name: 'manhattan',
      },
    })
  })
}
</script>
<style scoped lang="less">
.flow-chart-container {
  width: 100%;
  height: 300px;
  border: 1px solid #e8e8e8;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
  cursor: pointer;

  &:hover {
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.1);
  }
}

.flow-chart {
  width: 100%;
  height: 100%;
}

.fullscreen-preview {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;

  .preview-content {
    width: 90%;
    height: 90%;
    background: white;
    border-radius: 4px;
    display: flex;
    flex-direction: column;

    .fullscreen-chart {
      flex: 1;
      width: 100%;
    }

    .preview-toolbar {
      padding: 10px;
      background: #f5f5f5;
      border-top: 1px solid #e8e8e8;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;

      .zoom-level {
        margin-left: 15px;
        font-size: 14px;
        color: #666;
      }
    }
  }
}
</style>

其他更多功能配置参考官网https://x6.antv.antgroup.com/tutorial/getting-started和DeepSeek官网https://chat.deepseek.com/

二、最终效果

image-20250428160841656

全屏预览

image-20250428160859700

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