flashlight(color: String, time: any): Promise<any> {
    return new Promise(resolve => {
      setTimeout(function() {
        // this.drawLight(color);
        const c: any = document.getElementById('flashlight');
        const ctx = c.getContext('2d');
        ctx.beginPath();
        ctx.arc(c.width / 2, c.height - 50, 50, 0, 2 * Math.PI);
        ctx.fillStyle = color;
        ctx.fill();
        ctx.stroke();
        resolve(true);
      }, time);
    });
  }