42 lines, no comments · 1,213 tokens, written in 8 seconds for $0.013

 1  let particles = [];
 2  function setup() {
 3    createCanvas(windowWidth, windowHeight);
 4    colorMode(HSB, 360, 100, 100, 100);
 5    background(0, 0, 5);
 6    for (let i = 0; i < 900; i++) particles.push(new Particle());
 7  }
 8  class Particle {
 9    constructor() { this.reset(); }
10    reset() {
11      this.x = random(width);
12      this.y = random(height);
13      this.life = random(100, 300);
14    }
15    update() {
16      let a = noise(this.x * 0.003, this.y * 0.003, frameCount * 0.002) * TWO_PI * 2;
17      let nx = this.x + cos(a) * 1.6;
18      let ny = this.y + sin(a) * 1.6;
19      let h = (degrees(a) + frameCount * 0.2) % 360;
20      stroke(h, 80, 100, 30);
21      strokeWeight(1.2);
22      line(this.x, this.y, nx, ny);
23      this.x = nx;
24      this.y = ny;
25      this.life--;
26      if (this.life < 0 || this.x < 0 || this.x > width || this.y < 0 || this.y > height) this.reset();
27    }
28  }
29  function draw() {
30    noStroke();
31    fill(0, 0, 5, 3);
32    rect(0, 0, width, height);
33    for (let p of particles) p.update();
34  }
35  function mousePressed() {
36    background(0, 0, 5);
37    noiseSeed(floor(random(100000)));
38  }
39  function windowResized() {
40    resizeCanvas(windowWidth, windowHeight);
41    background(0, 0, 5);
42  }