23 lines, no comments · 1,963 tokens, written in 14 seconds for $0.0040

 1  function setup() {
 2    createCanvas(600, 400);
 3  }
 4  
 5  let x = 100;
 6  let y = 100;
 7  let dx = 4;
 8  let dy = 3;
 9  
10  function draw() {
11    background(0, 30);
12    fill(255, 100, 100);
13    noStroke();
14    ellipse(x, y, 40, 40);
15    x += dx;
16    y += dy;
17    if (x >= width || x <= 0) {
18      dx = -dx;
19    }
20    if (y >= height || y <= 0) {
21      dy = -dy;
22    }
23  }