43 lines, 3 of them comments · 380 tokens, written in 2 seconds for $0.0002

 1  let x, y;
 2  let xSpeed, ySpeed;
 3  let diameter;
 4  let r, g, b;
 5  
 6  function setup() {
 7    createCanvas(400, 400);
 8    diameter = 50;
 9    x = width / 2;
10    y = height / 2;
11    xSpeed = 3;
12    ySpeed = 2;
13    r = random(255);
14    g = random(255);
15    b = random(255);
16  }
17  
18  function draw() {
19    background(220);
20    
21    // Move the ball
22    x += xSpeed;
23    y += ySpeed;
24    
25    // Check for collisions with walls
26    if (x + diameter / 2 > width || x - diameter / 2 < 0) {
27      xSpeed *= -1;
28      r = random(255);
29      g = random(255);
30      b = random(255);
31    }
32    if (y + diameter / 2 > height || y - diameter / 2 < 0) {
33      ySpeed *= -1;
34      r = random(255);
35      g = random(255);
36      b = random(255);
37    }
38    
39    // Draw the ball
40    fill(r, g, b);
41    noStroke();
42    ellipse(x, y, diameter, diameter);
43  }