91 lines, 8 of them comments · 1,230 tokens, written in 16 seconds for $0.0055

 1  let particles = [];
 2      const NUM_PARTICLES = 800;
 3      let noiseScale = 0.005;
 4      let hueOffset = 0;
 5  
 6      function setup() {
 7        createCanvas(windowWidth, windowHeight);
 8        colorMode(HSB, 360, 100, 100, 100);
 9        background(0);
10  
11        for (let i = 0; i < NUM_PARTICLES; i++) {
12          particles.push({
13            x: random(width),
14            y: random(height),
15            speed: random(0.5, 2.5),
16            life: random(100, 300),
17            maxLife: 300,
18            size: random(1, 3)
19          });
20        }
21      }
22  
23      function draw() {
24        // Semi-transparent background for trail effect
25        noStroke();
26        fill(0, 0, 0, 3);
27        rect(0, 0, width, height);
28  
29        hueOffset += 0.2;
30  
31        for (let i = 0; i < particles.length; i++) {
32          let p = particles[i];
33  
34          // Calculate angle from noise field
35          let angle = noise(p.x * noiseScale, p.y * noiseScale, frameCount * 0.003) * TWO_PI * 2;
36  
37          // Mouse influence
38          let dx = mouseX - p.x;
39          let dy = mouseY - p.y;
40          let distToMouse = sqrt(dx * dx + dy * dy);
41          let mouseInfluence = map(distToMouse, 0, 300, 0.8, 0);
42          mouseInfluence = constrain(mouseInfluence, 0, 0.8);
43  
44          let mouseAngle = atan2(dy, dx);
45          angle = lerp(angle, mouseAngle, mouseInfluence);
46  
47          // Update position
48          p.x += cos(angle) * p.speed;
49          p.y += sin(angle) * p.speed;
50          p.life--;
51  
52          // Calculate color
53          let hue = (hueOffset + noise(p.x * 0.003, p.y * 0.003) * 120) % 360;
54          let alpha = map(p.life, 0, 100, 0, 80);
55          alpha = constrain(alpha, 0, 80);
56  
57          // Draw particle
58          noStroke();
59          fill(hue, 80, 95, alpha);
60          circle(p.x, p.y, p.size);
61  
62          // Reset particle if out of bounds or life ended
63          if (p.x < 0 || p.x > width || p.y < 0 || p.y > height || p.life <= 0) {
64            p.x = random(width);
65            p.y = random(height);
66            p.life = p.maxLife;
67            p.speed = random(0.5, 2.5);
68          }
69        }
70  
71        // Draw mouse glow
72        if (mouseIsPressed) {
73          for (let r = 80; r > 0; r -= 5) {
74            fill((hueOffset + 180) % 360, 60, 100, map(r, 0, 80, 15, 0));
75            circle(mouseX, mouseY, r);
76          }
77        }
78      }
79  
80      function mousePressed() {
81        noiseScale = 0.01;
82      }
83  
84      function mouseReleased() {
85        noiseScale = 0.005;
86      }
87  
88      function windowResized() {
89        resizeCanvas(windowWidth, windowHeight);
90        background(0);
91      }