50 lines, no comments · 2,424 tokens, written in 35 seconds for $0.015

 1  function setup() {
 2    createCanvas(windowWidth, windowHeight);
 3    colorMode(HSB, 360, 100, 100, 100);
 4    noStroke();
 5  }
 6  
 7  let particles = [];
 8  
 9  function draw() {
10    background(0, 12);
11    particles.push(new Particle(mouseX, mouseY));
12    if (particles.length > 120) {
13      particles.shift();
14    }
15    for (let p of particles) {
16      p.update();
17      p.show();
18    }
19  }
20  
21  function windowResized() {
22    resizeCanvas(windowWidth, windowHeight);
23  }
24  
25  class Particle {
26    constructor(x, y) {
27      this.pos = createVector(x + random(-8, 8), y + random(-8, 8));
28      this.vel = p5.Vector.random2D().mult(random(0.3, 1.8));
29      this.acc = createVector(0, 0);
30      this.hue = (frameCount * 1.5) % 360;
31      this.life = 100;
32    }
33  
34    update() {
35      let mouse = createVector(mouseX, mouseY);
36      let force = p5.Vector.sub(mouse, this.pos);
37      force.setMag(0.04);
38      this.acc.add(force);
39      this.vel.add(this.acc);
40      this.vel.limit(2.5);
41      this.pos.add(this.vel);
42      this.acc.mult(0);
43      this.life -= 0.8;
44    }
45  
46    show() {
47      fill(this.hue, 75, 95, this.life);
48      ellipse(this.pos.x, this.pos.y, 7);
49    }
50  }