Tree structure and topology diagram optimization of Vue statistical charts

Tree structure and topology diagram optimization of Vue statistical charts

In web development, statistical charts are one of the most common functions. As a popular JavaScript framework, Vue also provides a wealth of tools and components to implement various complex charts.

In this article, we will focus on two common statistical chart structures: tree structure and topology chart, and introduce how to use Vue for optimization.

1. Tree structure

Tree structure is a way of organizing data into hierarchical relationships. In statistical charts, the tree structure can clearly display the hierarchical structure and correlation relationships of data, and is often used to display organizational structures, department relationships, etc.

The following is an example of a simple tree structure written in Vue:

<template>
  <div>
    <ul>
      <li v-for="item in treeData" :key="item.id">
        {{ item.label }}
        <ul v-if="item.children.length > 0">
          <tree :treeData="item.children"></tree>
        </ul>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  name: 'Tree',
  props: {
    treeData: {
      type: Array,
      default: () => []
    }
  }
}
</script>

In the above example, we created a component named Tree for display Tree. Pass the tree data through props, and then use the v-for directive to traverse the data and render it on the page. When a node has child nodes, we recursively use the Tree component to render.

2. Topological diagram

Topological diagram is a chart structure used to display the relationship between data. In statistical analysis, topology diagrams are often used to display physical and logical topology, flow charts, etc.

The following is an example of a simple topology map written in Vue:

<template>
  <div>
    <svg>
      <line v-for="link in links" :key="link.id" :x1="link.source.x" :y1="link.source.y" :x2="link.target.x" :y2="link.target.y" stroke="black" />
      <circle v-for="node in nodes" :key="node.id" :cx="node.x" :cy="node.y" r="5" fill="blue" />
    </svg>
  </div>
</template>

<script>
export default {
  name: 'Topology',
  data() {
    return {
      nodes: [
        { id: 1, x: 50, y: 50 },
        { id: 2, x: 100, y: 100 }
      ],
      links: [
        { id: 1, source: { x: 50, y: 50 }, target: { x: 100, y: 100 } }
      ]
    }
  }
}
</script>

In the above example, we created a component named Topology, using The SVG element implements the drawing of topological diagrams. Store the data of nodes and connections through the data attribute, and use the v-for directive to traverse the data and render it on the page.

3. Optimization

When the amount of data is large, tree structures and topology maps may encounter performance problems. To optimize performance, we can use virtual scrolling and caching techniques.

For example, for a tree structure, we can use the vue-virtual-scroller plug-in to implement virtual scrolling and only render nodes in the currently visible area, thus improving performance.

<template>
  <div>
    <vue-virtual-scroller class="tree-container">
      <ul>
        <li v-for="item in treeData" :key="item.id">
          {{ item.label }}
          <ul v-if="item.children.length > 0">
            <tree :treeData="item.children"></tree>
          </ul>
        </li>
      </ul>
    </vue-virtual-scroller>
  </div>
</template>

For topology diagrams, we can use the vis-network library to implement caching of nodes and connections, and only render the data in the currently visible area instead of all nodes and connections.

<template>
  <div>
    <vis-network ref="network">
      <vis-node v-for="node in visibleNodes" :key="node.id" :node="node"></vis-node>
      <vis-edge v-for="link in visibleLinks" :key="link.id" :link="link"></vis-edge>
    </vis-network>
  </div>
</template>

<script>
export default {
  name: 'Topology',
  mounted() {
    // 初始化vis-network
    const container = this.$refs.network.$el
    const data = {
      nodes: this.nodes,
      edges: this.links
    }
    new vis.Network(container, data, {})
  },
  computed: {
    visibleNodes() {
      // 根据可见区域计算出当前可见的节点
    },
    visibleLinks() {
      // 根据可见区域计算出当前可见的连接
    }
  }
}
</script>

Through the above optimization methods, we can significantly improve the rendering performance of tree structures and topology maps, and better adapt to the display of large-scale data.

Summary

This article introduces the common tree structures and topology diagrams in Vue statistical charts, and provides corresponding code examples. We also discussed how to optimize performance through virtual scrolling and caching techniques. I hope this content can help you better develop and optimize statistical chart functions.

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