51 lines, no comments · 1,281 tokens, written in 9 seconds for $0.013

 1  let particles = [];
 2  let seed = 0;
 3  
 4  class P {
 5    constructor() { this.reset(); }
 6    reset() {
 7      this.x = random(width);
 8      this.y = random(height);
 9      this.life = random(80, 300);
10    }
11    update() {
12      let a = noise(this.x * 0.003 + seed, this.y * 0.003, frameCount * 0.002) * TWO_PI * 2;
13      let px = this.x;
14      let py = this.y;
15      this.x += cos(a) * 1.6;
16      this.y += sin(a) * 1.6;
17      let h = (a * 40 + frameCount * 0.2) % 360;
18      stroke(h, 70, 100, 14);
19      line(px, py, this.x, this.y);
20      this.life--;
21      if (this.life < 0 || this.x < 0 || this.x > width || this.y < 0 || this.y > height) this.reset();
22    }
23  }
24  
25  function setup() {
26    createCanvas(windowWidth, windowHeight);
27    colorMode(HSB, 360, 100, 100, 100);
28    strokeWeight(1.2);
29    background(240, 30, 5);
30    for (let i = 0; i < 1500; i++) particles.push(new P());
31  }
32  
33  function draw() {
34    if (frameCount % 6 === 0) {
35      noStroke();
36      fill(240, 30, 5, 3);
37      rect(0, 0, width, height);
38    }
39    for (let p of particles) p.update();
40  }
41  
42  function mousePressed() {
43    seed = random(1000);
44    background(240, 30, 5);
45    for (let p of particles) p.reset();
46  }
47  
48  function windowResized() {
49    resizeCanvas(windowWidth, windowHeight);
50    background(240, 30, 5);
51  }