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Swrls

  1. const canvas = document.createElement("canvas");
  2. const c = canvas.getContext("2d");
  3.  
  4. canvas.width = innerWidth;
  5. canvas.height = innerHeight;
  6. document.body.append(canvas); 
  7.  
  8. const TWO_PI = 2 * Math.PI;
  9.  
  10. class Dot {
  11.   constructor(id, x, y, theta, parent) {
  12.     this.x = x;
  13.     this.y = y;
  14.     this.t = theta;
  15.     this.vx = Math.cos(this.t) * Math.random() * 2;
  16.     this.vy = Math.sin(this.t) * Math.random() * 2;
  17.     this.life = 30;
  18.     this.col = parent.col;
  19.  
  20.     if (Math.random() < 0.005) this.other = true;
  21.     if (this.other) {
  22.       this.life = 1000;
  23.       this.t = Math.random() * 7;
  24.       this.vx = Math.cos(this.t) * Math.random() * 2;
  25.       this.vy = Math.sin(this.t) * Math.random() * 2;
  26.       this.col = "black";
  27.     }
  28.     this.iter = 0;
  29.     this.parent = parent;
  30.     this.id = id;
  31.     this.alpha = 0.25;
  32.  
  33.     if (Math.random() < 0.3) this.alpha = 0.25;
  34.   }
  35.  
  36.   draw() {
  37.     this.x += this.vx;
  38.     this.y += this.vy;
  39.     this.iter++;
  40.     if (this.iter > this.life) {
  41.       delete this.parent.dots[this.id];
  42.     }
  43.     c.fillStyle = this.col;
  44.     c.globalAlpha = this.alpha;
  45.     if (!this.no) this.alpha -= 0.00125;
  46.     c.fillRect(this.x, this.y, this.parent.size, this.parent.size);
  47.   }
  48. }
  49.  
  50. class Stain {
  51.   constructor(x = innerWidth, y = innerHeight) {
  52.     this.x = x / 2;
  53.     this.y = y / 2;
  54.     this.num = 1;
  55.     this.step = TWO_PI / this.num;
  56.  
  57.     this.size = 1 + Math.random() * Math.random() * 2;
  58.     this.rad = Math.random() * 300;
  59.     this.dots = {};
  60.     this.dotId = 0;
  61.     this.col = Math.random() < 0.8 ? "white" : "black";
  62.     this.to = Math.random() * 7;
  63.     this.S = 20 + Math.random() * 50;
  64.     this.R = 100 + Math.random() * 300;
  65.     this.rr = 50 + Math.random() * 300;
  66.     this.dir = Math.random() < 0.6 ? 1 : Math.random() * 10 - 5;
  67.     this.v = 1;
  68.     this.tt = 0;
  69.     if (Math.random() * 0.25) this.v = Math.random() * 5;
  70.   }
  71.  
  72.   draw() { 
  73.     const circ = this.rad * TWO_PI;
  74.     this.rad -= this.v;
  75.  
  76.     this.step = TWO_PI / circ;
  77.  
  78.     if (this.rad > 0) {
  79.       for (let i = 1; i <= this.R; i += this.S) {
  80.         let t = (i * this.step + this.to) * this.dir;
  81.         let x = this.x + this.rad * Math.cos(t);
  82.         let y = this.y + this.rad * Math.sin(t);
  83.         this.dots[this.dotId] = new Dot(this.dotId, x, y, t, this);
  84.         this.dotId++;
  85.       }
  86.     }
  87.     for (let i in this.dots) {
  88.       if (this.dots[i]) this.dots[i].draw();
  89.     }
  90.   }
  91. }
  92.  
  93. onresize = e => {
  94.   canvas.width = innerWidth;
  95.   canvas.height = innerHeight;
  96.   c.fillStyle = "black";
  97.   c.fillRect(0, 0, innerWidth, innerHeight)
  98. }
  99.  
  100. onresize()
  101.  
  102. let ss = [new Stain()];
  103.  
  104. function loop() {
  105.   if (Math.random() < 0.05) {
  106.     ss.push(
  107.       new Stain(Math.random() * innerWidth * 2, Math.random() * innerHeight * 2)
  108.     );
  109.   }
  110.   ss.forEach((s) => s.draw());
  111.   c.globalAlpha = 0.05;
  112.   c.drawImage(canvas, 0, 3, canvas.width + 0.2, canvas.height - 6);
  113.   c.globalAlpha = 1;
  114.   requestAnimationFrame(loop);
  115. }
  116. loop();

Speed coding for some recent youtube shorts…

snippet.zone ~ 2021-24 /// {s/z}