思维导图究竟是什么以及如何在小程序中用 F6 绘制

why 544 2024-06-25

什么是思维导图？怎么在小程序中绘制思维导图？下面本篇文章给大家介绍一下使用f6在小程序中绘制思维导图的方法，希望对大家有所帮助！

什么是思维导图？怎么使用F6在小程序中绘制思维导图？

什么是思维导图？

思维导图（英语：mind map），又称脑图、心智地图、头脑风暴图、心智图、灵感触发图、概念地图、或思维地图，是一种用图像整理信息的图解。它用一个中央关键词或想法以辐射线形连接所有的代表字词、想法、任务或其它关联项目。它可以利用不同的方式去表现人们的想法，如引题式、可见形象化式、建构系统式和分类式。它普遍地用作在研究、组织、解决问题和政策制定中。《维基百科》

思维导图是由英国的托尼·博赞于1970年代提出的一种辅助思考工具。以目标主题为中心节点不断向外延展关联，不断分解和探索，最终形成一张完整的树状图。从具体的操作过程来看，也可以理解为对探索过程的可视化，完整记录了每一次关联的结果。这种形式更加符合人的思考方式，最后的图也让我们对主题更有体感和整体的了解。

正因为思维导图的关注点在于思考，而我们的正常活动离不开思考，所以思维导图有非常广泛的使用场景。比如总结归纳、报告演示、头脑风暴等。实施起来只需要纸笔足以，当然也有丰富的在线、独立应用可以支持到图的制作。如果我们的产品需要展示围绕一个主题的多层关联信息的时候，便可以采用思维导图的形式。F6可以很方便地在小程序中绘制脑图，比如上图的效果，有相关需求的同学值得一试。

F6中如何绘制

演示示例可以参考f6.antv.vision/zh/docs/exa…本节代码已经开源，感兴趣可以查看

支付宝 github.com/antvis/F6/t…
微信 github.com/antvis/F6/t…

支付宝中

首先安装

1	`npm install @antv/f6 @antv/f6-alipay -S`

data.js

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export default {
  id: &#39;Modeling Methods&#39;,
  children: [
    {
      id: &#39;Classification&#39;,
      children: [
        {
          id: &#39;Logistic regression&#39;,
        },
        {
          id: &#39;Linear discriminant analysis&#39;,
        },
        {
          id: &#39;Rules&#39;,
        },
        {
          id: &#39;Decision trees&#39;,
        },
        {
          id: &#39;Naive Bayes&#39;,
        },
        {
          id: &#39;K nearest neighbor&#39;,
        },
        {
          id: &#39;Probabilistic neural network&#39;,
        },
        {
          id: &#39;Support vector machine&#39;,
        },
      ],
    },
    {
      id: &#39;Consensus&#39;,
      children: [
        {
          id: &#39;Models diversity&#39;,
          children: [
            {
              id: &#39;Different initializations&#39;,
            },
            {
              id: &#39;Different parameter choices&#39;,
            },
            {
              id: &#39;Different architectures&#39;,
            },
            {
              id: &#39;Different modeling methods&#39;,
            },
            {
              id: &#39;Different training sets&#39;,
            },
            {
              id: &#39;Different feature sets&#39;,
            },
          ],
        },
        {
          id: &#39;Methods&#39;,
          children: [
            {
              id: &#39;Classifier selection&#39;,
            },
            {
              id: &#39;Classifier fusion&#39;,
            },
          ],
        },
        {
          id: &#39;Common&#39;,
          children: [
            {
              id: &#39;Bagging&#39;,
            },
            {
              id: &#39;Boosting&#39;,
            },
            {
              id: &#39;AdaBoost&#39;,
            },
          ],
        },
      ],
    },
    {
      id: &#39;Regression&#39;,
      children: [
        {
          id: &#39;Multiple linear regression&#39;,
        },
        {
          id: &#39;Partial least squares&#39;,
        },
        {
          id: &#39;Multi-layer feedforward neural network&#39;,
        },
        {
          id: &#39;General regression neural network&#39;,
        },
        {
          id: &#39;Support vector regression&#39;,
        },
      ],
    },
  ],
};

index.json

{
  "defaultTitle": "mindMap",
  "usingComponents": {
    "f6-canvas": "@antv/f6-alipay/es/container/container"
  }
}

index.js

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import F6 from &#39;@antv/f6&#39;;
import TreeGraph from &#39;@antv/f6/dist/extends/graph/treeGraph&#39;;
import { wrapContext } from &#39;../../../common/utils/context&#39;;
 
import data from &#39;./data&#39;;
 
/**
 * 脑图-自节点自动两侧分布
 */
 
Page({
  canvas: null,
  ctx: null,
  renderer: &#39;&#39;, // mini、mini-native等，F6需要，标记环境
  isCanvasInit: false, // canvas是否准备好了
  graph: null,
 
  data: {
    width: 375,
    height: 600,
    pixelRatio: 2,
    forceMini: false,
  },
 
  onLoad() {
    // 注册自定义树，节点等
    F6.registerGraph(&#39;TreeGraph&#39;, TreeGraph);
 
    // 同步获取window的宽高
    const { windowWidth, windowHeight, pixelRatio } = my.getSystemInfoSync();
 
    this.setData({
      width: windowWidth,
      height: windowHeight,
      pixelRatio,
    });
  },
 
  /**
   * 初始化cnavas回调，缓存获得的context
   * @param {*} ctx 绘图context
   * @param {*} rect 宽高信息
   * @param {*} canvas canvas对象，在render为mini时为null
   * @param {*} renderer 使用canvas 1.0还是canvas 2.0，mini | mini-native
   */
  handleInit(ctx, rect, canvas, renderer) {
    this.isCanvasInit = true;
    this.ctx = wrapContext(ctx);
    this.renderer = renderer;
    this.canvas = canvas;
    this.updateChart();
  },
 
  /**
   * canvas派发的事件，转派给graph实例
   */
  handleTouch(e) {
    this.graph && this.graph.emitEvent(e);
  },
 
  updateChart() {
    const { width, height, pixelRatio } = this.data;
 
    // 创建F6实例
    this.graph = new F6.TreeGraph({
      context: this.ctx,
      renderer: this.renderer,
      width,
      height,
      pixelRatio,
      fitView: true,
      modes: {
        default: [
          {
            type: &#39;collapse-expand&#39;,
            onChange: function onChange(item, collapsed) {
              const model = item.getModel();
              model.collapsed = collapsed;
              return true;
            },
          },
          &#39;drag-canvas&#39;,
          &#39;zoom-canvas&#39;,
        ],
      },
      defaultNode: {
        size: 26,
        anchorPoints: [
          [0, 0.5],
          [1, 0.5],
        ],
      },
      defaultEdge: {
        type: &#39;cubic-horizontal&#39;,
      },
      layout: {
        type: &#39;mindmap&#39;,
        direction: &#39;H&#39;,
        getHeight: function getHeight() {
          return 16;
        },
        getWidth: function getWidth() {
          return 16;
        },
        getVGap: function getVGap() {
          return 10;
        },
        getHGap: function getHGap() {
          return 50;
        },
      },
    });
    let centerX = 0;
    this.graph.node(function(node) {
      if (node.id === &#39;Modeling Methods&#39;) {
        centerX = node.x;
      }
 
      // position的取值（由于ESlint禁止嵌套的三元表达，所以单独提取出来写）
      let position_value = null;
      if (node.children && node.children.length > 0) {
        position_value = &#39;left&#39;;
      } else if (node.x > centerX) position_value = &#39;right&#39;;
      else position_value = &#39;left&#39;;
 
      return {
        label: node.id,
        labelCfg: {
          offset: 5,
          position: position_value,
        },
      };
    });
 
    this.graph.data(data);
    this.graph.render();
    this.graph.fitView();
  },
});

index.axml

<f6-canvas
  width="{{width}}"
  height="{{height}}"
  forceMini="{{forceMini}}"
  pixelRatio="{{pixelRatio}}"
  onTouchEvent="handleTouch"
  onInit="handleInit"
></f6-canvas>

微信中

首先安装

1	`npm install @antv/f6-wx -S`

@antv/f6-wx 由于微信对npm包不是很友好，所以我们分装了 @antv/f6-wx 帮助用户简化操作。

data.js 同上

index.json

{
  "defaultTitle": "脑图",
  "usingComponents": {
    "f6-canvas": "@antv/f6-wx/canvas/canvas"
  }
}

index.wxml

<f6-canvas
  width="{{width}}"
  height="{{height}}"
  forceMini="{{forceMini}}"
  pixelRatio="{{pixelRatio}}"
  bind:onTouchEvent="handleTouch"
  bind:onInit="handleInit"
></f6-canvas>

index.js

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import F6 from &#39;@antv/f6-wx&#39;;
import TreeGraph from &#39;@antv/f6-wx/extends/graph/treeGraph&#39;;
 
 
import data from &#39;./data&#39;;
 
/**
 * 脑图-自节点自动两侧分布
 */
 
Page({
  canvas: null,
  ctx: null,
  renderer: &#39;&#39;, // mini、mini-native等，F6需要，标记环境
  isCanvasInit: false, // canvas是否准备好了
  graph: null,
 
  data: {
    width: 375,
    height: 600,
    pixelRatio: 1,
    forceMini: false,
  },
 
  onLoad() {
    // 注册自定义树，节点等
    F6.registerGraph(&#39;TreeGraph&#39;, TreeGraph);
 
    // 同步获取window的宽高
    const { windowWidth, windowHeight, pixelRatio } = wx.getSystemInfoSync();
 
    this.setData({
      width: windowWidth,
      height: windowHeight,
      // pixelRatio,
    });
  },
 
  /**
   * 初始化cnavas回调，缓存获得的context
   * @param {*} ctx 绘图context
   * @param {*} rect 宽高信息
   * @param {*} canvas canvas对象，在render为mini时为null
   * @param {*} renderer 使用canvas 1.0还是canvas 2.0，mini | mini-native
   */
  handleInit(event) {
    const {ctx, rect, canvas, renderer} = event.detail
    this.isCanvasInit = true;
    this.ctx = ctx;
    this.renderer = renderer;
    this.canvas = canvas;
    this.updateChart();
  },
 
  /**
   * canvas派发的事件，转派给graph实例
   */
  handleTouch(e) {
    this.graph && this.graph.emitEvent(e.detail);
  },
 
  updateChart() {
    const { width, height, pixelRatio } = this.data;
 
    // 创建F6实例
    this.graph = new F6.TreeGraph({
      context: this.ctx,
      renderer: this.renderer,
      width,
      height,
      pixelRatio,
      fitView: true,
      modes: {
        default: [
          {
            type: &#39;collapse-expand&#39;,
            onChange: function onChange(item, collapsed) {
              const model = item.getModel();
              model.collapsed = collapsed;
              return true;
            },
          },
          &#39;drag-canvas&#39;,
          &#39;zoom-canvas&#39;,
        ],
      },
      defaultNode: {
        size: 26,
        anchorPoints: [
          [0, 0.5],
          [1, 0.5],
        ],
      },
      defaultEdge: {
        type: &#39;cubic-horizontal&#39;,
      },
      layout: {
        type: &#39;mindmap&#39;,
        direction: &#39;H&#39;,
        getHeight: function getHeight() {
          return 16;
        },
        getWidth: function getWidth() {
          return 16;
        },
        getVGap: function getVGap() {
          return 10;
        },
        getHGap: function getHGap() {
          return 50;
        },
      },
    });
    let centerX = 0;
    this.graph.node(function(node) {
      if (node.id === &#39;Modeling Methods&#39;) {
        centerX = node.x;
      }
 
      // position的取值（由于ESlint禁止嵌套的三元表达，所以单独提取出来写）
      let position_value = null;
      if (node.children && node.children.length > 0) {
        position_value = &#39;left&#39;;
      } else if (node.x > centerX) position_value = &#39;right&#39;;
      else position_value = &#39;left&#39;;
 
      return {
        label: node.id,
        labelCfg: {
          offset: 5,
          position: position_value,
        },
      };
    });
 
    this.graph.data(data);
    this.graph.render();
    this.graph.fitView();
  },
});

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思维导图究竟是什么以及如何在小程序中用 F6 绘制

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