mr-crocs-adventures/js/effects/SnowEffect.js

import {FullscreenEffect} from "./FullscreenEffect.js";

export class SnowEffect extends FullscreenEffect
{
	static NAME = 'snow';

	constructor()
	{
		super();
		this.image = new Image();
		this.image.src = 'js/effects/snow.png';
		this.offset = 0;
	}

	update(timestamp)
	{
		super.update(timestamp);
		this.offset = timestamp % 512;
	}

	render(context)
	{
		super.render(context);

		for (let y = -1; y < Math.ceil(context.canvas.height / 512); y++) {
			for (let x = -1; x < Math.ceil(context.canvas.width / 512); x++) {
				context.drawImage(this.image, this.offset + 512 * x, this.offset + 512 * y);
			}
		}
	}
}