Angular Google 圖表 - 樹形圖

樹形圖是資料樹的視覺化呈現，其中每個節點可能具有零個或多個子節點，並且一個父節點（根節點除外）。每個節點顯示為一個矩形，可以根據我們分配的值進行大小和顏色調整。大小和顏色相對於圖表中的所有其他節點進行估值。以下是樹形圖表的示例。

我們已經在“Google 圖表配置語法”一章中看到了用於繪製圖表的配置。現在，讓我們看一個樹形圖表的示例。

配置

我們使用 **TreeMap** 類顯示樹形圖表。

type = 'TreeMap';

示例

app.component.ts

import { Component } from '@angular/core';
@Component({
   selector: 'app-root',
   templateUrl: './app.component.html',
   styleUrls: ['./app.component.css']
})
export class AppComponent {
   title = '';
   type='TreeMap';
   data = [
      ["Global",null,0,0],
      ["America","Global",0,0],
      ["Europe","Global",0,0],
      ["Asia","Global",0,0],
      ["Australia","Global",0,0],
      ["Africa","Global",0,0],

      ["USA","America",52,31],
      ["Mexico","America",24,12],
      ["Canada","America",16,-23],

      ["France","Europe",42,-11],
      ["Germany","Europe",31,-2],
      ["Sweden","Europe",22,-13],

      ["China","Asia",36,4],
      ["Japan","Asia",20,-12],
      ["India","Asia",40,63],

      ["Egypt","Africa",21,0],
      ["Congo","Africa",10,12],
      ["Zaire","Africa",8,10],
          
   ];
   columnNames = ["Location", "Parent","Market trade volume (size)","Market increase/decrease (color)"];
   options = { 
      minColor:"#ff7777",
      midColor:'#ffff77',
      maxColor:'#77ff77',
      headerHeight:15,
      showScale:true
   };
   width = 550;
   height = 400;
}

結果

驗證結果。

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