import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
//components
import { AppComponent } from './app.component';
import { Bubbles } from './bubbles.component';

@NgModule({
 declarations: [
  AppComponent,
  Bubbles
 ],
 imports: [
  BrowserModule,
  FormsModule
 ],
 providers: [],
 bootstrap: [AppComponent]
})
export class AppModule { }

 开始刷新气泡图
 停止刷新气泡图
 

import { Component, OnDestroy, OnInit } from '@angular/core';
@Component({
 selector: 'app-root',
 templateUrl: './app.component.html',
 styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit, OnDestroy {
 intervalId = 0;
 numArray = [];
 // 清除定时器
 private clearTimer() {
  console.log('stop refreshing');
  clearInterval(this.intervalId);
 }
 // 生成指定范围内的随机数
 private getRandom(begin, end) {
  return Math.floor(Math.random() * (end - begin));
 }
 ngOnInit() {
  for (let i in this.numArray) {
   this.numArray[i] = this.getRandom(0, 100000000); // "0", "1", "2",
  };
 }
 // 元素关闭清除定时器
 ngOnDestroy() { this.clearTimer(); }
 // 启动定时刷新数组
 refreshArr() {
  this.clearTimer()
  this.intervalId = window.setInterval(() => {
   this.numArray = [];
   for (let i=0;i<8;i++)
   {
    this.numArray.push(this.getRandom(0, 100000000));
   }
  }, 3000);
 }
 // 停止定时刷新数组
 stopRefresh() {
  this.clearTimer();
 }
}

import { Component, Input, OnChanges, AfterViewInit, ViewChild} from '@angular/core';
import {BubblesChart} from './bubbles.chart';
declare var d3;
@Component({
  selector: 'bubbles',
  template: '',
})
export class Bubbles implements OnChanges, AfterViewInit {
  @Input() values: number[];
  chart: BubblesChart;
  @ViewChild('target') target;//获得子组件的引用
  constructor() {
  }
  // 每当元素对象上绑定的数据 输入属性值 values 发生变化时，执行下列函数，实现图表动态变化
  ngOnChanges(changes) {
    if (this.chart) {
      // 先清空汽泡图，再重新调用汽泡图对象的render方法，根据变动后的值绘制图形
      this.chart.destroy();
      this.chart.render(changes.values.currentValue);
    }
  }
  
   ngAfterViewInit() {
      // 初始化汽泡图
      this.chart = new BubblesChart(this.target.nativeElement);
      this.chart.render(this.values);
    }
}

declare var d3;
// define a bubble chart class 
// Exports the visualization module
export class BubblesChart {
  target: HTMLElement;
  //构造函数， 基于一个 HTML元素对象内部来绘制
  constructor(target: HTMLElement) {
    this.target = target;
  }
  // 渲染 入参为数值 完成基于一个数组的 汽泡图的绘制
  render(values: number[]) {
    console.log('start rendering');
    console.log(values);
    d3.select(this.target)
      // Get the old circles
      .selectAll('circle')
      .data(values)
      .enter()
      // For each new data point, append a circle to the target SVG
      .append('circle')
      // Apply several style attributes to the circle
      .attr('r', d => Math.log(d)) // 半径
      .attr('fill', '#5fc') // 颜色
      .attr('stroke', '#333') // 轮廓颜色
      .attr('transform', (d, i) => { // 移动位置
        var offset = i * 30 + 3 * Math.log(d);
        return `translate(${offset}, ${offset})`;
      });
  }

  destroy() {
    d3.select(this.target).selectAll('circle').remove();
  }
}