82 lines, 10 of them comments · 660 tokens, written in 14 seconds for $0.0005

 1  function setup() {
 2    createCanvas(800, 600);
 3    colorMode(HSB, 360, 100, 100, 1);
 4    noStroke();
 5    
 6    // Array to store particles
 7    particles = [];
 8  }
 9  
10  function draw() {
11    // Semi-transparent background for trail effect
12    fill(0, 0.1);
13    rect(0, 0, width, height);
14    
15    // Add new particles based on mouse position
16    if (mouseIsPressed) {
17      for (let i = 0; i < 5; i++) {
18        particles.push(new Particle(mouseX, mouseY));
19      }
20    } else if (mouseX > 0 && mouseY > 0) {
21      // Add fewer particles when not pressing
22      if (frameCount % 3 === 0) {
23        particles.push(new Particle(mouseX, mouseY));
24      }
25    }
26    
27    // Update and display all particles
28    for (let i = particles.length - 1; i >= 0; i--) {
29      particles[i].update();
30      particles[i].display();
31      
32      // Remove dead particles
33      if (particles[i].isDead()) {
34        particles.splice(i, 1);
35      }
36    }
37  }
38  
39  // Particle class
40  class Particle {
41    constructor(x, y) {
42      this.pos = createVector(x, y);
43      this.vel = p5.Vector.random2D();
44      this.vel.mult(random(2, 5));
45      this.acc = createVector(0, 0);
46      this.life = 255;
47      this.decay = random(3, 7);
48      this.size = random(3, 8);
49      this.hue = random(360);
50    }
51    
52    update() {
53      this.vel.add(this.acc);
54      this.pos.add(this.vel);
55      this.acc.mult(0);
56      this.life -= this.decay;
57      
58      // Add slight gravity
59      this.applyForce(createVector(0, 0.05));
60      
61      // Slowly drift apart
62      this.vel.mult(0.97);
63    }
64    
65    applyForce(force) {
66      this.acc.add(force);
67    }
68    
69    display() {
70      fill(this.hue, 80, 90, this.life / 255);
71      ellipse(this.pos.x, this.pos.y, this.size);
72    }
73    
74    isDead() {
75      return this.life <= 0;
76    }
77  }
78  
79  // Reset particles on key press
80  function keyPressed() {
81    particles = [];
82  }