ujs/src/js/scene.js

import { Pointer } from './pointer.js';

export class Scene {
  constructor(width, height) {
    this.init(width, height);
  }

  init = async (width, height) => {
    this.canvas = document.querySelector('canvas');
    this.context = this.canvas.getContext('2d');

    this.setScreenSize(width, height);
  }

  #clearCanvas() {
    this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
  }

  run() {
    // clear canvas
    this.#clearCanvas();

    // fill canvas
    this.context.fillStyle = '#523c4e';
    this.context.fillRect(0, 0, this.canvas.width, this.canvas.height);

    // draw border
    this.context.strokeStyle = '#8bd0ba';
    this.context.lineWidth = 1;
    this.context.strokeRect(5, 5, this.canvas.width - 10, this.canvas.height - 10);

    // draw rect in center
    this.context.fillStyle = '#d44e52';
    this.context.fillRect(this.canvas.width / 2 - 50, this.canvas.height / 2 - 50, 100, 100);
  }

  setScreenSize(w, h) {
    this.canvas.width = w;
    this.canvas.height = h;
  }
}