ujs/src/js/app.js

import { Scene } from './scene.js';
import { Settings } from './settings.js';
import { Pointer } from './pointer.js';

export class App {
  constructor(
    canvas,
    w,
    h,
    options = {
      backgroundColor: '#ffcc68',
    }
  ) {
    this.view = document.createElement('canvas');

    this.canvas = this.view;
    this.context = this.canvas.getContext('2d');
    this.options = options;

    this.scene = new Scene(this.canvas, this.context, w, h);
    this.prevTime = Date.now();

    Pointer.init();

    this.run();
  }

  run = () => {
    let newTime = Date.now();
    Settings.delta = (newTime - this.prevTime) / 1000;
    this.prevTime = newTime;

    // clear canvas
    this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);

    // fill canvas
    this.context.fillStyle = this.options.backgroundColor;
    this.context.fillRect(0, 0, this.canvas.width, this.canvas.height);

    // draw border
    this.context.strokeStyle = '#101024';
    this.context.lineWidth = 1;
    this.context.strokeRect(5, 5, this.canvas.width - 10, this.canvas.height - 10);

    this.scene.run();

    requestAnimationFrame(this.run);
  };
}