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Hamaca

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// «Hamaca» · gpt-6-sol (medium)
// A playground swing set: a sturdy A-frame of red metal tubes with a horizontal top bar, two swings hanging from it on chains, each with a flat yellow seat. Wide along x, with the swings facing -y.

// Concrete pads beneath the four feet.
const pad = "#b8b9b3", padTop = "#d6d5c9", padEdge = "#92958f";
for (const x of [6, 41]) {
  for (const y of [11, 37]) {
    box(x - 4, y - 3, 0, x + 4, y + 3, 0, padEdge);
    box(x - 3, y - 2, 0, x + 3, y + 2, 0, padTop);
    for (let i = 0; i < 9; i++) {
      const px = x - 3 + Math.floor(rand() * 7);
      const py = y - 2 + Math.floor(rand() * 5);
      set(px, py, 0, pad);
    }
  }
}

const darkRed = "#a72d35";
const red = "#e24b49";
const brightRed = "#fa7770";

function redTube(x0, y0, z0, x1, y1, z1, r) {
  line(x0, y0, z0, x1, y1, z1, r + 0.45, darkRed);
  line(x0, y0, z0, x1, y1, z1, r, red);
}

// Four splayed legs make two sturdy A-frames.
for (const x of [6, 41]) {
  for (const footY of [11, 37]) {
    redTube(x, footY, 2, x, 24, 36, 1.15);

    // Foot plate, with exposed fastening bolts.
    box(x - 2, footY - 2, 1, x + 2, footY + 2, 2, darkRed);
    box(x - 1, footY - 1, 2, x + 1, footY + 1, 2, red);
    set(x - 2, footY - 2, 2, "#f2c76b");
    set(x + 2, footY + 2, 2, "#f2c76b");
  }

  // Crosspiece completes the readable A silhouette.
  redTube(x, 16, 13, x, 32, 13, 0.9);
  set(x, 23, 14, brightRed);
  set(x, 24, 14, "#ffd371");
  set(x, 25, 14, brightRed);
}

// Long horizontal top rail, shaded like painted tubular steel.
line(4, 24, 36, 43, 24, 36, 1.85, darkRed);
line(4, 24, 36, 43, 24, 36, 1.3, red);
line(5, 23, 37, 42, 23, 37, 0, brightRed);
for (const x of [4, 6, 24, 41, 43]) {
  box(x, 23, 35, x, 25, 37, darkRed);
  set(x, 23, 37, "#ffb16c");
}

// Fixed hanging brackets and dark pivot pins.
for (const cx of [15, 32]) {
  for (const chainX of [cx - 5, cx + 5]) {
    box(chainX - 1, 22, 34, chainX + 1, 25, 35, "#73383a");
    box(chainX, 22, 33, chainX, 24, 34, "#444e50");
    set(chainX, 21, 34, "#f4bf61");
  }
}

// Each complete swing rotates around its own point on the top bar.
function makeSwing(name, cx, speed) {
  part(name, [cx, 24, 35]);

  const steelDark = "#526467";
  const steelLight = "#abbdbc";
  for (const chainX of [cx - 5, cx + 5]) {
    line(chainX, 24, 11, chainX, 24, 33, 0, steelDark);

    // Alternating bright links give the chains texture at small scale.
    for (let z = 12; z <= 32; z += 3) {
      set(chainX, 23, z, steelLight);
      set(chainX, 24, z + 1, "#82999b");
    }
  }

  // Chunky, flat yellow seat with a warm orange underside.
  box(cx - 6, 21, 9, cx + 6, 27, 9, "#b87027");
  box(cx - 6, 21, 10, cx + 6, 27, 10, "#f4b935");
  box(cx - 5, 22, 10, cx + 5, 25, 10, "#ffe272");
  box(cx - 6, 21, 10, cx + 6, 21, 10, "#ffd053");
  for (const chainX of [cx - 5, cx + 5]) {
    box(chainX - 1, 23, 10, chainX + 1, 25, 11, "#d68b2e");
    set(chainX, 23, 11, "#ffe88d");
  }

  animate(name, { type: "swing", axis: "x", speed, amplitude: 0.5 });
}

makeSwing("left swing", 15, 2);
makeSwing("right swing", 32, -2);
part("body", [24, 24, 0]);