48 lines, no comments · 481 tokens, written in 6 seconds for $0.0075

 1  let balls = [];
 2  const NUM_BALLS = 20;
 3  
 4  function setup() {
 5    createCanvas(windowWidth, windowHeight);
 6    noStroke();
 7    for (let i = 0; i < NUM_BALLS; i++) {
 8      balls.push({
 9        x: random(width),
10        y: random(height),
11        vx: random(-2, 2),
12        vy: random(-2, 2),
13        r: random(8, 20),
14        c: color(random(100, 255), random(100, 255), random(100, 255), 180)
15      });
16    }
17  }
18  
19  function draw() {
20    background(10, 15, 30, 40);
21  
22    for (let i = 0; i < balls.length; i++) {
23      let b = balls[i];
24      b.x += b.vx;
25      b.y += b.vy;
26  
27      if (b.x < b.r || b.x > width - b.r) b.vx *= -1;
28      if (b.y < b.r || b.y > height - b.r) b.vy *= -1;
29  
30      fill(b.c);
31      circle(b.x, b.y, b.r * 2);
32  
33      for (let j = i + 1; j < balls.length; j++) {
34        let other = balls[j];
35        let d = dist(b.x, b.y, other.x, other.y);
36        if (d < 140) {
37          stroke(255, map(d, 0, 140, 120, 0));
38          strokeWeight(1);
39          line(b.x, b.y, other.x, other.y);
40          noStroke();
41        }
42      }
43    }
44  }
45  
46  function windowResized() {
47    resizeCanvas(windowWidth, windowHeight);
48  }