Angular 2 Example - How to use Canvas Element

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">    

    <!-- 1. Load libraries -->
    <!-- IE required polyfills, in this exact order -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/es6-shim/0.33.3/es6-shim.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.16/system-polyfills.js"></script>
    
    <script src="https://code.angularjs.org/2.0.0-beta.3/angular2-polyfills.js"></script>
    <script src="https://code.angularjs.org/tools/system.js"></script>
    <script src="https://code.angularjs.org/tools/typescript.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.3/Rx.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.3/angular2.dev.js"></script>

    <!-- 2. Configure SystemJS -->
    <script>
      System.config({
        transpiler: 'typescript', 
        typescriptOptions: { emitDecoratorMetadata: true }, 
        packages: {'app': {defaultExtension: 'ts'}} 
      });
      System.import('app/boot')
            .then(null, console.error.bind(console));
    </script>

  </head>

  <!-- 3. Display the application -->
  <body>
    <my-app>Loading...</my-app>
  </body>

</html>

import {bootstrap} from 'angular2/platform/browser'
import {Component} from "angular2/core";
import {ViewChild} from "angular2/core";
import {AfterViewInit} from "angular2/core";

@Component({
  selector: `my-app`,
  template: `
    <div>
      <canvas #myCanvas width="400" height="400" style="background:lightgray;"></canvas>
      <div>
        幅 <input type="range" min="1" max="400" [(ngModel)]="rectW" /><br />
        高さ <input type="range" min="1" max="400" [(ngModel)]="rectH" /><br />
        塗りの色 <input type="color" [(ngModel)]="rectColor" placeholder="color" value="{{rectColor}}" />
      </div>
    </div>
    `
})

export class AppComponent implements AfterViewInit {
  rectW:number = 100;
  rectH:number = 100;
  rectColor:string = "#FF0000";
  context:CanvasRenderingContext2D;

  @ViewChild("myCanvas") myCanvas;

  ngAfterViewInit() {
    // 参照をとれる
    let canvas = this.myCanvas.nativeElement;
    this.context = canvas.getContext("2d");

    this.tick();
  }

  tick() {
    // 本当はデータ変更時のみ呼び出したい
    requestAnimationFrame(()=> {
      this.tick()
    });

    var ctx = this.context;
    ctx.clearRect(0, 0, 400, 400);
    ctx.fillStyle = this.rectColor;
    ctx.fillRect(0, 0, this.rectW, this.rectH);
  }
}

bootstrap(AppComponent, []);