Angular Google 图表 - 树形图

树形图是数据树的可视化呈现，其中每个节点可能具有零个或多个子节点，并且一个父节点（根节点除外）。每个节点显示为一个矩形，可以根据我们分配的值进行大小和颜色调整。大小和颜色相对于图表中的所有其他节点进行估值。以下是树形图表的示例。

我们已经在“Google 图表配置语法”一章中看到了用于绘制图表的配置。现在，让我们看一个树形图表的示例。

配置

我们使用 **TreeMap** 类显示树形图表。

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;
}

结果

验证结果。

打印页面