when constellations fold

let r = 300;
let peeps = [];
let thresh = 50;
let t1 = 0;
let t2 = 0;
function setup() {
  cnv = createCanvas(600, 600);
  noStroke();
  peeps = [];
  r = min(width, height) / 3;
  n = random(1000, 3000);
  describe(
    "a constellation on a sphere that twists slowly into a torus. lines are light on a dark slate-teal background. the size and density is randomized"
  );
  thresh = r / 10 + random(0, r / 10);
  for (let i = 0; i < n; i++) {
    a = acos(random(-1, 1));
    b = random(0, 2 * PI);
    x = r * Math.sin(a) * Math.cos(b);
    y = r * Math.sin(a) * Math.sin(b);
    z = r * Math.cos(a);
    peeps.push(new Peep(a, b, x, y, z));
  }

  for (let i = 0; i < peeps.length; i++) {
    cnt = 0;
    cnt2 = 0;
    while (cnt < 1) {
      int1 = int(random(0, peeps.length));

      dx = peeps[int1].x - peeps[i].x;
      dy = peeps[int1].y - peeps[i].y;
      dz = peeps[int1].z - peeps[i].z;
      dist1 = sqrt(dx * dx + dy * dy + dz * dz);
      if (dist1 < thresh) {
        peeps[i].n1 = int1;
        cnt++;
      } else {
        cnt2++;
      }
      if (cnt2 > peeps.length * 2) {
        cnt = 1;
        peeps[i].n1 = i;
      }
    }
    cnt = 0;
    cnt2 = 0;
    while (cnt < 1) {
      int1 = int(random(0, peeps.length));

      dx = peeps[int1].x - peeps[i].x;
      dy = peeps[int1].y - peeps[i].y;
      dz = peeps[int1].z - peeps[i].z;
      dist1 = sqrt(dx * dx + dy * dy + dz * dz);
      if (dist1 < thresh) {
        peeps[i].n2 = int1;
        cnt++;
      } else {
        cnt2++;
      }
      if (cnt2 > peeps.length * 2) {
        cnt = 1;
        peeps[i].n2 = i;
      }
    }
    cnt = 0;
    cnt2 = 0;
    while (cnt < 1) {
      int1 = int(random(0, peeps.length));

      dx = peeps[int1].x - peeps[i].x;
      dy = peeps[int1].y - peeps[i].y;
      dz = peeps[int1].z - peeps[i].z;
      dist1 = sqrt(dx * dx + dy * dy + dz * dz);
      if (dist1 < thresh) {
        peeps[i].n3 = int1;
        cnt++;
      } else {
        cnt2++;
      }
      if (cnt2 > peeps.length * 2) {
        cnt = 1;
        peeps[i].n3 = i;
      }
    }
    cnt = 0;
    cnt2 = 0;
    while (cnt < 1) {
      int1 = int(random(0, peeps.length));

      dx = peeps[int1].x - peeps[i].x;
      dy = peeps[int1].y - peeps[i].y;
      dz = peeps[int1].z - peeps[i].z;
      dist1 = sqrt(dx * dx + dy * dy + dz * dz);
      if (dist1 < thresh) {
        peeps[i].n4 = int1;
        cnt++;
      } else {
        cnt2++;
      }
      if (cnt2 > peeps.length * 2) {
        cnt = 1;
        peeps[i].n4 = i;
      }
    }
  }
}

function draw() {
  if (!mouseIsPressed) {
    t1 += 0.005;
    t2 += 0.005;
  } else {
    t1 += 0.01;
    t2 += 0.01;
  }

  translate(width / 2, height / 2);
  background(20, 40, 50);

  for (let i = 0; i < peeps.length; i++) {
    peeps[i].play();
  }
  for (let i = 0; i < peeps.length; i++) {
    push();

    fill(100, 100, 200);
    circle(peeps[i].x, peeps[i].y, 2);

    pop();
    push();
    stroke(
      100 - 50 * (peeps[i].z / r),
      140 - 50 * (peeps[i].z / r),
      160 - 50 * (peeps[i].z / r)
    );
    strokeWeight(0.5 + 0.4 * (peeps[i].z / (2 * r)));
    line(
      peeps[i].x,
      peeps[i].y,
      peeps[peeps[i].n1].x,
      peeps[peeps[i].n1].y
    );
    line(
      peeps[i].x,
      peeps[i].y,
      peeps[peeps[i].n2].x,
      peeps[peeps[i].n2].y
    );
    line(
      peeps[i].x,
      peeps[i].y,
      peeps[peeps[i].n3].x,
      peeps[peeps[i].n3].y
    );
    line(
      peeps[i].x,
      peeps[i].y,
      peeps[peeps[i].n4].x,
      peeps[peeps[i].n4].y
    );
    pop();
  }
}

class Peep {
  constructor(a, b, x, y, z) {
    this.a = a;
    this.b = b;
    this.x = x;
    this.y = y;
    this.z = z;
    this.n1 = 0;
    this.n2 = 0;
    this.n3 = 0;
    this.n4 = 0;
  }
  play() {
    this.x = r * Math.sin(this.a + t2 / 8) * Math.cos(this.b + t2 / 2);
    this.y = r * Math.sin(this.a + t2 / 4) * Math.sin(this.b + t2);
    this.z = r * Math.cos(this.a + t2 / 4);
  }
}

function keyPressed() {
  if (keyCode === 32) {
    setup();
    draw();
  } else if (keyCode === 83) {
    save(cnv, "wcf", "png");
  } else {
    t1 = 0;
    t2 = 0;
  }
}