// 程序化"素描"生成器：用带手绘抖动的线条绘制各条目的速写。
// 同一词条每次渲染结果一致（基于名称的种子），供 3D 页背与 HTML 面板复用。

const INK = '#3a2d22';
const INK_SOFT = 'rgba(58,45,34,0.55)';
const INK_FAINT = 'rgba(58,45,34,0.28)';
const WASH = 'rgba(150,120,80,0.10)';

// 确定性伪随机数（mulberry32）
function prng(seedStr) {
  let a = 0;
  for (let i = 0; i < seedStr.length; i++) {
    a = (a * 31 + seedStr.charCodeAt(i)) >>> 0;
  }
  a = a || 123456789;
  return function () {
    a |= 0; a = (a + 0x6D2B79F5) | 0;
    let t = Math.imul(a ^ (a >>> 15), 1 | a);
    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
  };
}

export function renderSketch(entry, size = 760) {
  const canvas = document.createElement('canvas');
  canvas.width = size;
  canvas.height = size;
  const ctx = canvas.getContext('2d');
  const rand = prng(entry.name + entry.sketch);

  ctx.clearRect(0, 0, size, size);
  const cx = size / 2;
  const cy = size / 2;
  const r = size * 0.48;

  const P = (x, y) => [cx + x * r, cy + y * r];

  // 手绘折线
  function line(pts, { color = INK, lw = 2.4, passes = 2, wobble = 0.015, close = false, dash = null } = {}) {
    ctx.strokeStyle = color;
    ctx.lineWidth = lw * (size / 760);
    ctx.lineCap = 'round';
    ctx.lineJoin = 'round';
    if (dash) ctx.setLineDash(dash);
    else ctx.setLineDash([]);
    for (let p = 0; p < passes; p++) {
      ctx.beginPath();
      pts.forEach((pt, i) => {
        const [x, y] = P(pt[0], pt[1]);
        const jx = wobble * r * (rand() - 0.5) * 2;
        const jy = wobble * r * (rand() - 0.5) * 2;
        if (i === 0) ctx.moveTo(x + jx, y + jy);
        else ctx.lineTo(x + jx, y + jy);
      });
      if (close) ctx.closePath();
      ctx.stroke();
    }
    ctx.setLineDash([]);
  }

  // 形状填充（可选淡淡水彩底）
  function fill(pts, color = WASH) {
    ctx.fillStyle = color;
    ctx.beginPath();
    pts.forEach((pt, i) => {
      const [x, y] = P(pt[0], pt[1]);
      if (i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y);
    });
    ctx.closePath();
    ctx.fill();
  }

  // 阴影排线（在裁剪区域内）
  function hatch(pts, { spacing = 0.035, angle = -45, color = INK_SOFT, lw = 1.1, box = 2.4 } = {}) {
    ctx.save();
    ctx.beginPath();
    pts.forEach((pt, i) => {
      const [x, y] = P(pt[0], pt[1]);
      if (i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y);
    });
    ctx.closePath();
    ctx.clip();
    ctx.save();
    ctx.translate(cx, cy);
    ctx.rotate((angle * Math.PI) / 180);
    ctx.strokeStyle = color;
    ctx.lineWidth = lw * (size / 760);
    ctx.beginPath();
    const L = box * r;
    const s = spacing * r;
    for (let i = -60; i < 60; i++) {
      ctx.moveTo(i * s, -L);
      ctx.lineTo(i * s, L);
    }
    ctx.stroke();
    ctx.restore();
    ctx.restore();
  }

  function circle(cx0, cy0, rad, opts = {}) {
    const { color = INK, lw = 2.2, passes = 1, fill: f = null } = opts;
    const [x, y] = P(cx0, cy0);
    const rr = rad * r;
    if (f) { ctx.fillStyle = f; ctx.beginPath(); ctx.arc(x, y, rr, 0, Math.PI * 2); ctx.fill(); }
    ctx.strokeStyle = color;
    ctx.lineWidth = lw * (size / 760);
    for (let p = 0; p < passes; p++) {
      ctx.beginPath();
      const j = (rand() - 0.5) * r * 0.02;
      ctx.arc(x + j, y + j, rr, 0, Math.PI * 2);
      ctx.stroke();
    }
  }

  function dot(x, y, rad, color = INK) {
    const [px, py] = P(x, y);
    ctx.fillStyle = color;
    ctx.beginPath();
    ctx.arc(px, py, rad * r, 0, Math.PI * 2);
    ctx.fill();
  }

  // 各类型速写
  const types = {
    fossil() {
      // 头骨
      fill([[0, 0.35], [-0.55, 0.05], [-0.5, -0.5], [-0.2, -0.78], [0.3, -0.75], [0.58, -0.4], [0.5, 0.0], [0.3, 0.1]], 'rgba(150,120,80,0.12)');
      line([[0, 0.32], [-0.52, 0.05], [-0.5, -0.42], [-0.3, -0.66], [0.0, -0.74], [0.32, -0.68], [0.55, -0.4], [0.5, 0.0], [0.32, 0.12]], { lw: 2.8 });
      // 眼窝
      circle(-0.22, -0.18, 0.16, { lw: 2 });
      circle(0.28, -0.18, 0.15, { lw: 2 });
      // 鼻腔
      line([[-0.02, -0.05], [0.0, 0.14], [-0.16, 0.14]], { lw: 2 });
      line([[-0.02, -0.05], [0.0, 0.14], [0.14, 0.14]], { lw: 1.4 });
      // 上颌与牙齿
      line([[0.05, 0.12], [0.22, 0.1], [0.32, 0.12]], { lw: 2.2 });
      for (let i = 0; i < 5; i++) {
        line([[-0.42 + i * 0.16, 0.02], [-0.42 + i * 0.16, 0.16]], { lw: 1.2, passes: 1, wobble: 0.004 });
      }
      // 骨裂纹理
      line([[-0.1, -0.7], [-0.16, -0.55], [-0.05, -0.45]], { color: INK_FAINT, lw: 1 });
      line([[0.2, -0.66], [0.1, -0.55], [0.18, -0.42]], { color: INK_FAINT, lw: 1 });
      // 下方地平线与年代波纹
      line([[-0.6, 0.5], [0.6, 0.5]], { color: INK_FAINT, lw: 1.2, passes: 1 });
      line([[-0.45, 0.62], [0.45, 0.62]], { color: INK_FAINT, lw: 1, passes: 1 });
    },

    tablet() {
      fill([[-0.5, -0.5], [0.5, -0.5], [0.5, 0.5], [-0.5, 0.5]], 'rgba(170,140,95,0.16)');
      line([[-0.5, -0.5], [0.5, -0.5], [0.5, 0.5], [-0.5, 0.5], [-0.5, -0.5]], { lw: 3, wobble: 0.01 });
      // 楔形文字符号：小三角
      for (let row = 0; row < 5; row++) {
        for (let col = 0; col < 6; col++) {
          const x = -0.36 + col * 0.15;
          const y = -0.34 + row * 0.18;
          const s = 0.04 + rand() * 0.02;
          line([[x, y], [x - s, y - s * 1.4]], { lw: 1.6, passes: 1, wobble: 0.005 });
          line([[x, y], [x + s, y - s * 1.4]], { lw: 1.6, passes: 1, wobble: 0.005 });
          line([[x, y], [x, y - s * 1.8]], { lw: 1.6, passes: 1, wobble: 0.005 });
        }
      }
      // 裂缝
      line([[-0.1, 0.44], [0.02, 0.2], [-0.08, -0.05], [0.05, -0.3]], { color: INK_SOFT, lw: 1.4, passes: 1 });
      line([[-0.44, -0.1], [-0.25, -0.15]], { color: INK_SOFT, lw: 1.2, passes: 1 });
    },

    pyramid() {
      // 地平线
      line([[-0.72, 0.42], [0.72, 0.42]], { lw: 2 });
      // 主金字塔
      fill([[-0.52, 0.42], [0.0, -0.62], [0.55, 0.42]], 'rgba(160,120,70,0.12)');
      line([[-0.52, 0.42], [0.0, -0.62], [0.55, 0.42], [-0.52, 0.42]], { lw: 3 });
      // 石砌纹理
      for (let i = 1; i <= 5; i++) {
        const t = i / 6;
        const xl = -0.52 + (0.52) * t;
        const xr = 0.55 - (0.55) * t;
        const y = 0.42 - (1.04) * t;
        line([[xl, y], [xr, y]], { color: INK_SOFT, lw: 1.1, passes: 1, wobble: 0.004 });
      }
      // 小金字塔
      line([[-0.72, 0.42], [-0.5, 0.0], [-0.28, 0.42]], { lw: 2 });
      line([[-0.72, 0.42], [-0.5, 0.0], [-0.28, 0.42], [-0.72, 0.42]], { lw: 2, color: INK_SOFT });
      // 太阳
      circle(0.55, -0.55, 0.16, { lw: 2.4 });
      for (let i = 0; i < 10; i++) {
        const a = (i / 10) * Math.PI * 2 + 0.3;
        line([[0.55 + Math.cos(a) * 0.2, -0.55 + Math.sin(a) * 0.2], [0.55 + Math.cos(a) * 0.28, -0.55 + Math.sin(a) * 0.28]], { lw: 1.6, passes: 1 });
      }
      // 沙丘波纹
      line([[-0.7, 0.62], [-0.2, 0.62]], { color: INK_FAINT, lw: 1.2, passes: 1 });
      line([[0.1, 0.66], [0.65, 0.66]], { color: INK_FAINT, lw: 1.2, passes: 1 });
    },

    figure() {
      // 圆形徽章背景
      circle(0, 0, 0.85, { color: INK_FAINT, lw: 1.4, passes: 1 });
      circle(0, 0, 0.72, { color: INK_FAINT, lw: 1, passes: 1 });
      // 头部轮廓（侧影）
      fill([[0.18, -0.28], [0.18, -0.1], [0.24, 0.04], [0.3, 0.14], [0.26, 0.24], [0.2, 0.3], [0.24, 0.5], [0.05, 0.55], [-0.05, 0.5], [-0.02, 0.34], [0.0, 0.24], [-0.05, 0.12], [-0.04, -0.1], [-0.05, -0.4], [0.02, -0.6], [0.12, -0.66], [0.18, -0.28]], 'rgba(120,95,70,0.12)');
      line([[0.05, -0.62], [0.16, -0.56], [0.18, -0.3], [0.2, -0.12], [0.25, 0.02], [0.3, 0.12], [0.27, 0.22], [0.21, 0.3], [0.25, 0.46], [0.14, 0.55], [0.02, 0.56], [-0.04, 0.5], [-0.02, 0.34], [0.0, 0.24], [-0.05, 0.14], [-0.05, -0.08], [-0.04, -0.3], [0.0, -0.52], [0.05, -0.62]], { lw: 2.8 });
      // 发髻 / 头发
      line([[0.05, -0.62], [-0.02, -0.5], [0.02, -0.38], [-0.03, -0.26], [0.0, -0.14]], { lw: 2, color: INK_SOFT });
      hatch([[0.02, -0.6], [0.16, -0.56], [0.18, -0.3], [0.0, -0.52], [0.02, -0.6]], { spacing: 0.03, angle: 60, color: INK_SOFT, lw: 1 });
      // 眼睛、眉、耳
      line([[0.2, -0.02], [0.28, -0.02], [0.25, 0.04], [0.2, -0.02]], { lw: 1.8, passes: 1 });
      line([[0.19, -0.1], [0.3, -0.07]], { lw: 1.8, passes: 1 });
      line([[-0.05, -0.08], [-0.02, -0.2]], { lw: 1.6, passes: 1 });
      // 肩部与衣领
      line([[-0.28, 0.55], [0.0, 0.55]], { lw: 2.6 });
      line([[-0.55, 0.85], [0.0, 0.55], [0.6, 0.85]], { lw: 2.4 });
      line([[-0.42, 0.7], [0.05, 0.58]], { lw: 1.6, color: INK_SOFT, passes: 1 });
    },

    temple() {
      // 台基
      line([[-0.7, 0.6], [0.7, 0.6]], { lw: 2.6 });
      line([[-0.64, 0.66], [0.64, 0.66]], { lw: 2 });
      // 柱子
      for (let i = 0; i < 6; i++) {
        const x = -0.5 + i * 0.2;
        line([[x, 0.58], [x, -0.1]], { lw: 2 });
        line([[x - 0.02, 0.58], [x - 0.02, -0.1]], { lw: 1, color: INK_SOFT, passes: 1 });
      }
      // 柱顶横梁
      line([[-0.6, -0.1], [0.6, -0.1]], { lw: 2.4 });
      line([[-0.58, -0.18], [0.58, -0.18]], { lw: 2 });
      // 三角楣
      fill([[-0.58, -0.18], [0.0, -0.66], [0.58, -0.18]], 'rgba(140,110,70,0.10)');
      line([[-0.58, -0.18], [0.0, -0.66], [0.58, -0.18], [-0.58, -0.18]], { lw: 2.6 });
      // 楣内浮雕圆
      circle(0, -0.4, 0.1, { lw: 1.8, passes: 1 });
      // 山门台阶
      for (let i = 1; i <= 3; i++) {
        line([[-0.3 - i * 0.08, 0.66 + i * 0.05], [0.3 + i * 0.08, 0.66 + i * 0.05]], { lw: 1.6, color: INK_SOFT, passes: 1 });
      }
    },

    crown() {
      // 冠身
      fill([[-0.55, 0.5], [-0.55, -0.1], [0.55, -0.1], [0.55, 0.5]], 'rgba(160,120,50,0.14)');
      line([[-0.55, 0.5], [-0.55, -0.1], [0.55, -0.1], [0.55, 0.5]], { lw: 3 });
      // 齿尖与宝珠
      const peaks = [-0.55, -0.28, 0.0, 0.28, 0.55];
      peaks.forEach((px, i) => {
        const h = 0.5 + (i % 2 === 0 ? 0.26 : 0.4);
        line([[px, 0.5], [px + (i % 2 === 0 ? 0.02 : 0), h]], { lw: 2.4 });
        dot(px, h + 0.07, 0.05, '#a03a2a');
      });
      // 冠带
      line([[-0.58, 0.28], [0.58, 0.28]], { lw: 2, color: INK_SOFT });
      // 中央纹饰
      circle(0, 0.12, 0.14, { lw: 2, passes: 1 });
      dot(0, 0.12, 0.05, '#a03a2a');
      // 底部绒边
      for (let i = 0; i < 14; i++) {
        const x = -0.55 + i * 0.085;
        dot(x, -0.12, 0.02, INK_SOFT);
      }
      hatch([[-0.55, 0.5], [-0.55, -0.1], [0.55, -0.1], [0.55, 0.5]], { spacing: 0.035, angle: -60, color: INK_FAINT, lw: 1 });
    },

    colosseum() {
      // 底层地面
      line([[-0.75, 0.6], [0.75, 0.6]], { lw: 2 });
      // 三层椭圆拱券
      const tiers = [
        { y: 0.12, rw: 0.68, rh: 0.16, n: 7 },
        { y: -0.1, rw: 0.74, rh: 0.15, n: 8 },
        { y: -0.32, rw: 0.8, rh: 0.14, n: 9 },
      ];
      tiers.forEach((t) => {
        // 顶部线（略残缺）
        line([[-t.rw, t.y - t.rh], [t.rw, t.y - t.rh]], { lw: 2.2 });
      });
      tiers.forEach((t) => {
        for (let i = 0; i <= t.n; i++) {
          const a = -0.9 + (i / t.n) * 1.8; // 参数 -0.9..0.9
          const x = a * t.rw;
          const y = t.y;
          // 拱券（简化小竖线 + 弧）
          line([[x, y], [x, y + t.rh * 0.7]], { lw: 1.6, color: INK_SOFT, passes: 1 });
          if (i < t.n) {
            const x2 = (a + 0.9 / t.n) * t.rw;
            const mx = (x + x2) / 2;
            line([[x, y + t.rh * 0.7], [mx, y + t.rh * 1.15], [x2, y + t.rh * 0.7]], { lw: 1.4, color: INK_SOFT, passes: 1 });
          }
        }
      });
      // 残破上缘
      line([[-0.82, -0.48], [-0.6, -0.42], [-0.4, -0.55], [-0.1, -0.4], [0.2, -0.52], [0.5, -0.4], [0.82, -0.46]], { lw: 2.2, passes: 1 });
      line([[-0.82, 0.56], [-0.85, -0.3]], { lw: 2, passes: 1 });
      line([[0.82, 0.56], [0.85, -0.3]], { lw: 2, passes: 1 });
    },

    scroll() {
      // 卷轴两端
      circle(-0.52, 0, 0.09, { lw: 2.2 });
      circle(0.52, 0, 0.09, { lw: 2.2 });
      // 展开的纸
      fill([[-0.52, -0.28], [0.52, -0.28], [0.52, 0.28], [-0.52, 0.28]], 'rgba(210,190,150,0.20)');
      line([[-0.52, -0.28], [0.52, -0.28]], { lw: 2.4 });
      line([[-0.52, 0.28], [0.52, 0.28]], { lw: 2.4 });
      // 竖排文字行
      for (let i = 0; i < 7; i++) {
        const x = -0.38 + i * 0.13;
        line([[x, -0.18], [x, 0.18]], { lw: 1.3, color: INK_SOFT, passes: 1, wobble: 0.005 });
      }
      // 毛笔
      line([[0.05, -0.6], [0.02, -0.9]], { lw: 2.2 });
      line([[0.0, -0.92], [0.14, -0.98], [0.05, -0.72]], { lw: 2, color: INK_SOFT, passes: 1 });
      // 墨滴
      dot(0.3, 0.42, 0.03, INK_SOFT);
      dot(0.36, 0.46, 0.02, INK_FAINT);
    },

    horseman() {
      // 地平线
      line([[-0.75, 0.55], [0.75, 0.55]], { lw: 1.8, color: INK_FAINT });
      // 马（剪影线条）
      fill([[0.2, 0.5], [0.32, 0.05], [0.55, 0.0], [0.6, 0.3], [0.42, 0.42], [0.2, 0.5]], 'rgba(90,65,45,0.10)');
      line([[0.25, 0.5], [0.35, 0.15], [0.42, 0.05], [0.58, 0.05], [0.6, 0.28], [0.45, 0.4], [0.25, 0.5]], { lw: 2.6 });
      // 马腿
      line([[0.3, 0.45], [0.26, 0.55]], { lw: 2 });
      line([[0.44, 0.42], [0.42, 0.55]], { lw: 2 });
      line([[0.55, 0.3], [0.6, 0.55]], { lw: 2 });
      // 马尾
      line([[0.25, 0.5], [0.08, 0.35], [0.02, 0.5]], { lw: 2, color: INK_SOFT });
      // 骑手
      line([[-0.05, 0.4], [-0.02, 0.15], [0.05, 0.05], [0.12, 0.15], [0.1, 0.4]], { lw: 2.4 });
      circle(-0.02, -0.02, 0.09, { lw: 1.8, passes: 1 });
      // 弓
      line([[-0.05, 0.18], [-0.3, 0.28]], { lw: 1.6, passes: 1 });
      line([[-0.3, 0.28], [-0.32, 0.1]], { lw: 1.6, color: INK_SOFT, passes: 1 });
      // 箭
      line([[-0.28, 0.24], [-0.55, 0.14]], { lw: 1.4, passes: 1 });
      // 旗帜
      line([[0.1, 0.15], [0.4, -0.3]], { lw: 1.8 });
      line([[0.4, -0.3], [0.32, -0.32], [0.38, -0.4], [0.42, -0.28]], { lw: 1.6, passes: 1 });
    },

    ship() {
      // 波浪
      line([[-0.75, 0.5], [-0.4, 0.5], [-0.2, 0.42], [0.0, 0.5], [0.3, 0.42], [0.55, 0.5], [0.75, 0.5]], { lw: 1.6, color: INK_SOFT, passes: 1 });
      line([[-0.7, 0.66], [0.7, 0.66]], { lw: 1.4, color: INK_FAINT, passes: 1 });
      // 船体
      fill([[-0.5, 0.12], [0.5, 0.12], [0.38, 0.4], [-0.4, 0.4]], 'rgba(80,60,40,0.14)');
      line([[-0.5, 0.12], [0.5, 0.12], [0.4, 0.38], [-0.42, 0.38], [-0.5, 0.12]], { lw: 2.6 });
      // 桅杆
      line([[0.0, 0.1], [0.0, -0.7]], { lw: 2.2 });
      line([[-0.35, 0.14], [-0.35, -0.45]], { lw: 1.8 });
      line([[0.35, 0.14], [0.35, -0.45]], { lw: 1.8 });
      // 帆（鼓风）
      fill([[0.0, -0.62], [0.42, -0.5], [0.3, -0.2], [0.0, -0.28]], 'rgba(200,180,140,0.22)');
      line([[0.0, -0.62], [0.4, -0.5], [0.3, -0.2], [0.0, -0.28], [0.0, -0.62]], { lw: 1.8 });
      fill([[-0.35, -0.4], [-0.05, -0.45], [-0.08, -0.2], [-0.35, -0.15]], 'rgba(200,180,140,0.18)');
      line([[-0.35, -0.4], [-0.06, -0.44], [-0.1, -0.18], [-0.35, -0.14], [-0.35, -0.4]], { lw: 1.6 });
      fill([[0.35, -0.4], [0.65, -0.48], [0.62, -0.2], [0.35, -0.15]], 'rgba(200,180,140,0.18)');
      line([[0.35, -0.4], [0.62, -0.48], [0.6, -0.18], [0.35, -0.14], [0.35, -0.4]], { lw: 1.6 });
      // 旗帜
      line([[0.0, -0.7], [0.0, -0.78]], { lw: 1.6 });
      line([[0.0, -0.76], [0.2, -0.74], [0.0, -0.7]], { lw: 1.4, passes: 1 });
      // 海鸟
      line([[-0.6, -0.4], [-0.5, -0.46], [-0.4, -0.4]], { lw: 1.2, color: INK_SOFT, passes: 1 });
      line([[-0.3, -0.55], [-0.2, -0.61], [-0.1, -0.55]], { lw: 1.2, color: INK_SOFT, passes: 1 });
    },

    globe() {
      circle(0, 0, 0.66, { lw: 2.6 });
      // 经纬线
      circle(0, 0, 0.66, { lw: 1, color: INK_FAINT, passes: 1 });
      for (const k of [0.3, 0.6]) {
        ctx.save();
        ctx.translate(cx, cy);
        ctx.strokeStyle = INK_FAINT;
        ctx.lineWidth = 1 * (size / 760);
        ctx.beginPath();
        ctx.ellipse(0, 0, 0.66 * r * Math.sqrt(1 - k * k), 0.66 * r, 0, 0, Math.PI * 2);
        ctx.stroke();
        ctx.beginPath();
        ctx.ellipse(0, 0, 0.66 * r, 0.66 * r * Math.sqrt(1 - k * k), 0, 0, Math.PI * 2);
        ctx.stroke();
        ctx.restore();
      }
      // 大陆点阵
      for (let i = 0; i < 60; i++) {
        const a = rand() * Math.PI * 2;
        const rr = Math.sqrt(rand()) * 0.6;
        dot(Math.cos(a) * rr, Math.sin(a) * rr, 0.012, INK_SOFT);
      }
      // 航线（虚线）与箭头
      line([[0.3, -0.3], [0.55, -0.15], [0.6, 0.1], [0.45, 0.35], [0.15, 0.45]], { color: '#a03a2a', lw: 2, passes: 1, dash: [14, 9] });
      line([[0.15, 0.45], [0.02, 0.52]], { color: '#a03a2a', lw: 2, passes: 1 });
      line([[0.15, 0.45], [0.22, 0.55]], { color: '#a03a2a', lw: 2, passes: 1 });
      // 起止点
      dot(0.3, -0.3, 0.04, '#a03a2a');
      dot(0.15, 0.45, 0.04, '#a03a2a');
    },

    apple() {
      // 苹果
      fill([[0, -0.55], [0.35, -0.42], [0.42, -0.1], [0.28, 0.22], [0.0, 0.42], [-0.3, 0.2], [-0.4, -0.15], [-0.3, -0.44]], 'rgba(150,60,40,0.14)');
      line([[0.02, -0.5], [0.36, -0.4], [0.44, -0.08], [0.28, 0.24], [0.0, 0.44], [-0.3, 0.2], [-0.42, -0.16], [-0.32, -0.42]], { lw: 2.6 });
      line([[0.02, -0.5], [0.36, -0.4]], { lw: 2.6 });
      // 咬痕
      circle(-0.52, -0.05, 0.18, { lw: 2, passes: 1, color: INK_SOFT });
      // 果柄与叶
      line([[0.0, -0.5], [0.02, -0.72]], { lw: 2.2 });
      fill([[0.02, -0.72], [0.28, -0.78], [0.2, -0.58]], 'rgba(60,90,50,0.16)');
      line([[0.02, -0.72], [0.28, -0.76], [0.2, -0.6], [0.02, -0.72]], { lw: 1.8 });
      // 下落的轨迹（引力）
      line([[-0.1, 0.55], [-0.25, 0.72]], { color: INK_SOFT, lw: 1.6, passes: 1, dash: [10, 8] });
      dot(-0.3, 0.78, 0.03, INK_SOFT);
      line([[0.55, 0.5], [0.62, 0.62]], { color: INK_FAINT, lw: 1.2, passes: 1 });
    },

    machine() {
      // 底座
      line([[-0.7, 0.55], [0.7, 0.55]], { lw: 2.4 });
      // 锅炉
      fill([[-0.45, -0.2], [0.1, -0.2], [0.1, 0.1], [-0.45, 0.1]], 'rgba(90,70,50,0.14)');
      line([[-0.45, -0.2], [0.1, -0.2], [0.1, 0.1], [-0.45, 0.1], [-0.45, -0.2]], { lw: 2.4 });
      // 铆钉
      for (let i = 0; i < 5; i++) dot(-0.4 + i * 0.12, -0.2, 0.02, INK_SOFT);
      for (let i = 0; i < 5; i++) dot(-0.4 + i * 0.12, 0.1, 0.02, INK_SOFT);
      // 活塞杆
      line([[0.1, -0.05], [0.42, -0.05]], { lw: 2.2 });
      line([[0.42, -0.1], [0.42, 0.0]], { lw: 1.6 });
      // 飞轮
      circle(0.5, -0.05, 0.3, { lw: 2.4 });
      circle(0.5, -0.05, 0.08, { lw: 1.8, passes: 1 });
      for (let i = 0; i < 6; i++) {
        const a = (i / 6) * Math.PI * 2;
        line([[0.5 + Math.cos(a) * 0.08, -0.05 + Math.sin(a) * 0.08], [0.5 + Math.cos(a) * 0.3, -0.05 + Math.sin(a) * 0.3]], { lw: 1.4, passes: 1 });
      }
      // 蒸汽
      line([[-0.3, -0.32], [-0.2, -0.45], [-0.32, -0.6]], { color: INK_SOFT, lw: 1.8, passes: 1 });
      line([[-0.1, -0.4], [0.0, -0.55], [-0.08, -0.72]], { color: INK_SOFT, lw: 1.8, passes: 1 });
      line([[0.1, -0.34], [0.22, -0.48], [0.14, -0.62]], { color: INK_FAINT, lw: 1.6, passes: 1 });
      // 传动带
      line([[0.1, -0.05], [0.2, -0.1], [0.5, -0.32]], { lw: 1.2, color: INK_SOFT, passes: 1, dash: [9, 7] });
    },

    bell() {
      // 钟轭
      line([[-0.5, -0.55], [0.5, -0.55]], { lw: 2.6 });
      line([[-0.5, -0.55], [-0.42, -0.28]], { lw: 2 });
      line([[0.5, -0.55], [0.42, -0.28]], { lw: 2 });
      // 钟身
      fill([[-0.42, -0.28], [0.42, -0.28], [0.55, 0.45], [0.3, 0.5], [-0.3, 0.5], [-0.55, 0.45]], 'rgba(120,95,70,0.12)');
      line([[-0.42, -0.28], [0.42, -0.28], [0.55, 0.45], [0.3, 0.5], [-0.3, 0.5], [-0.55, 0.45], [-0.42, -0.28]], { lw: 2.6 });
      // 底口线
      line([[-0.55, 0.45], [0.55, 0.45]], { lw: 2 });
      // 裂纹（自由钟标志）
      line([[-0.05, -0.1], [0.02, 0.05], [-0.08, 0.22], [0.0, 0.42]], { lw: 2, color: '#a03a2a', passes: 1 });
      // 铭文带
      line([[-0.36, 0.05], [0.36, 0.05]], { lw: 1.4, color: INK_SOFT, passes: 1 });
      // 钟舌
      line([[0.0, -0.1], [0.0, 0.3]], { lw: 1.8 });
      circle(0, 0.32, 0.07, { lw: 1.6, passes: 1 });
    },

    tree() {
      // 树干
      line([[-0.0, 0.55], [0.0, 0.2], [0.02, -0.1]], { lw: 2.6 });
      // 树根
      line([[-0.15, 0.55], [0.0, 0.35]], { lw: 2 });
      line([[0.15, 0.55], [0.0, 0.35]], { lw: 2 });
      // 递归枝干
      const branch = (x, y, ang, len, depth) => {
        const ex = x + Math.cos(ang) * len;
        const ey = y + Math.sin(ang) * len;
        line([[x, y], [ex, ey]], { lw: Math.max(0.8, 2.4 * (len / 0.4)), passes: 1, wobble: 0.006 });
        if (depth > 0) {
          branch(ex, ey, ang + 0.5, len * 0.68, depth - 1);
          branch(ex, ey, ang - 0.5, len * 0.68, depth - 1);
          branch(ex, ey, ang + 0.2, len * 0.55, depth - 1);
        }
      };
      branch(0.02, -0.1, -Math.PI / 2, 0.42, 3);
      // 叶点
      for (let i = 0; i < 90; i++) {
        const a = rand() * Math.PI * 2;
        const rr = Math.sqrt(rand()) * 0.5;
        dot(Math.cos(a) * rr * 1.2, -0.5 + Math.sin(a) * rr * 0.8, 0.012 + rand() * 0.012, INK_SOFT);
      }
      // 地面
      line([[-0.6, 0.6], [0.6, 0.6]], { lw: 1.8, color: INK_FAINT });
    },

    atom() {
      // 原子核
      circle(0, 0, 0.1, { lw: 2 });
      dot(0.03, 0.03, 0.03, '#a03a2a');
      dot(-0.04, -0.02, 0.02, '#a03a2a');
      // 轨道
      const orbit = (rx, ry, rot) => {
        ctx.save();
        ctx.translate(cx, cy);
        ctx.rotate(rot);
        ctx.strokeStyle = INK_SOFT;
        ctx.lineWidth = 1.6 * (size / 760);
        ctx.beginPath();
        ctx.ellipse(0, 0, rx * r, ry * r, 0, 0, Math.PI * 2);
        ctx.stroke();
        // 电子
        const ea = rand() * Math.PI * 2;
        const ex = Math.cos(ea) * rx * r;
        const ey = Math.sin(ea) * ry * r;
        ctx.fillStyle = '#a03a2a';
        ctx.beginPath();
        ctx.arc(ex, ey, 0.045 * r, 0, Math.PI * 2);
        ctx.fill();
        ctx.restore();
      };
      orbit(0.66, 0.3, 0.2);
      orbit(0.66, 0.3, 2.2);
      orbit(0.5, 0.66, 1.2);
      // 公式
      ctx.save();
      ctx.translate(cx, cy + 0.86 * r);
      ctx.fillStyle = INK;
      ctx.font = `${Math.round(0.16 * r)}px Georgia, serif`;
      ctx.textAlign = 'center';
      ctx.fillText('E = mc²', 0, 0);
      ctx.restore();
    },

    dove() {
      // 鸽身（飞翔剪影）
      fill([[-0.4, 0.1], [-0.2, -0.1], [0.0, -0.12], [0.2, -0.1], [0.35, 0.05], [0.1, 0.18], [-0.2, 0.2]], 'rgba(200,190,170,0.22)');
      line([[-0.42, 0.08], [-0.2, -0.1], [0.0, -0.14], [0.2, -0.1], [0.34, 0.05], [0.1, 0.18], [-0.2, 0.2], [-0.42, 0.08]], { lw: 2.4 });
      // 翅膀
      line([[-0.1, -0.06], [-0.3, -0.5], [-0.05, -0.62]], { lw: 2.2 });
      line([[-0.3, -0.5], [-0.02, -0.28]], { lw: 1.4, color: INK_SOFT });
      // 眼与喙
      dot(-0.34, 0.02, 0.03, INK);
      line([[-0.42, 0.06], [-0.52, 0.12], [-0.42, 0.12]], { lw: 1.6, passes: 1 });
      // 橄榄枝
      line([[-0.52, 0.12], [-0.62, 0.3]], { lw: 1.8 });
      for (let i = 0; i < 5; i++) {
        const a = -0.4 + i * 0.5;
        const bx = -0.62 + Math.cos(a) * 0.1;
        const by = 0.3 + Math.sin(a) * 0.05 + i * 0.01;
        line([[-0.62 + (i * 0.02), 0.28 + i * 0.005], [bx, by]], { lw: 1.2, passes: 1 });
      }
      // 光芒
      for (let i = 0; i < 8; i++) {
        const a = (i / 8) * Math.PI * 2;
        line([[Math.cos(a) * 0.72, Math.sin(a) * 0.72], [Math.cos(a) * 0.82, Math.sin(a) * 0.82]], { lw: 1.4, color: INK_FAINT, passes: 1 });
      }
    },

    rocket() {
      // 星空
      for (let i = 0; i < 30; i++) {
        dot(-0.85 + rand() * 1.7, -0.85 + rand() * 1.4, 0.008 + rand() * 0.01, INK_FAINT);
      }
      // 火箭主体
      fill([[-0.14, -0.7], [0.14, -0.7], [0.14, 0.5], [-0.14, 0.5]], 'rgba(200,200,205,0.20)');
      line([[-0.14, -0.7], [0.14, -0.7], [0.14, 0.5], [-0.14, 0.5], [-0.14, -0.7]], { lw: 2.4 });
      // 头锥
      line([[-0.14, -0.7], [0.0, -0.92], [0.14, -0.7]], { lw: 2.4 });
      // 舷窗
      circle(0, -0.3, 0.07, { lw: 1.6, passes: 1 });
      // 尾翼
      line([[-0.14, 0.2], [-0.3, 0.5]], { lw: 2 });
      line([[-0.14, 0.2], [-0.16, 0.5]], { lw: 1.2, color: INK_SOFT });
      line([[0.14, 0.2], [0.3, 0.5]], { lw: 2 });
      line([[0.14, 0.2], [0.16, 0.5]], { lw: 1.2, color: INK_SOFT });
      // 喷焰
      line([[-0.08, 0.5], [0.0, 0.72], [0.08, 0.5]], { lw: 2, color: '#a03a2a' });
      line([[-0.05, 0.5], [0.0, 0.62], [0.05, 0.5]], { lw: 1.4, color: '#c9a227' });
      // 月球
      circle(0.62, -0.6, 0.22, { lw: 2.2, fill: 'rgba(210,200,180,0.16)' });
      circle(0.55, -0.66, 0.05, { lw: 1.2, passes: 1, color: INK_FAINT });
      circle(0.68, -0.55, 0.035, { lw: 1.2, passes: 1, color: INK_FAINT });
      // 旗帜
      line([[0.4, 0.5], [0.4, 0.3]], { lw: 1.4 });
      line([[0.4, 0.3], [0.56, 0.34], [0.4, 0.4]], { lw: 1.4, passes: 1 });
    },

    book() {
      // 摊开的书
      fill([[-0.5, -0.1], [0.0, -0.2], [0.5, -0.1], [0.5, 0.4], [0.0, 0.5], [-0.5, 0.4]], 'rgba(210,190,150,0.18)');
      line([[-0.5, -0.1], [0.0, -0.2], [0.5, -0.1], [0.5, 0.4], [0.0, 0.5], [-0.5, 0.4], [-0.5, -0.1]], { lw: 2.4 });
      line([[0.0, -0.2], [0.0, 0.5]], { lw: 2 });
      for (let i = 0; i < 4; i++) {
        const y = -0.05 + i * 0.14;
        line([[-0.4, y], [-0.08, y]], { lw: 1.2, color: INK_SOFT, passes: 1, wobble: 0.004 });
        line([[0.08, y], [0.4, y]], { lw: 1.2, color: INK_SOFT, passes: 1, wobble: 0.004 });
      }
      hatch([[-0.5, -0.1], [0.0, -0.2], [0.5, -0.1], [0.5, 0.4], [0.0, 0.5], [-0.5, 0.4]], { spacing: 0.04, angle: -45, color: INK_FAINT, lw: 1 });
    },

    bridge() {
      line([[-0.7, 0.45], [0.7, 0.45]], { lw: 1.6, color: INK_SOFT, passes: 1 });
      line([[-0.6, 0.6], [0.6, 0.6]], { lw: 1.2, color: INK_FAINT, passes: 1 });
      fill([[-0.5, 0.45], [-0.5, -0.05], [0.5, -0.05], [0.5, 0.45]], 'rgba(150,140,130,0.10)');
      line([[-0.5, 0.45], [-0.5, 0.05], [-0.35, -0.2], [0.0, -0.35], [0.35, -0.2], [0.5, 0.05], [0.5, 0.45]], { lw: 2.6 });
      line([[-0.55, 0.45], [-0.55, 0.28], [0.55, 0.28], [0.55, 0.45]], { lw: 1.6, color: INK_SOFT });
      for (let i = 0; i < 7; i++) {
        const x = -0.45 + i * 0.15;
        line([[x, 0.28], [x, 0.4]], { lw: 1.2, passes: 1, color: INK_SOFT });
      }
      line([[-0.3, 0.52], [0.0, 0.56], [0.3, 0.52]], { lw: 1, color: INK_FAINT, passes: 1 });
    },

    flag() {
      line([[-0.4, 0.6], [-0.4, -0.7]], { lw: 2.4 });
      fill([[-0.4, -0.65], [-0.1, -0.6], [0.05, -0.45], [-0.25, -0.5]], 'rgba(160,58,42,0.16)');
      line([[-0.4, -0.65], [-0.1, -0.6], [0.05, -0.45], [-0.25, -0.5], [-0.4, -0.65]], { lw: 2.2 });
      line([[-0.32, -0.55], [0.0, -0.48]], { lw: 1.4, color: INK_SOFT, passes: 1 });
      line([[-0.25, -0.5], [-0.15, -0.32]], { lw: 1.4, color: INK_SOFT, passes: 1 });
      line([[-0.6, 0.62], [0.6, 0.62]], { lw: 1.6, color: INK_FAINT });
      for (let i = 0; i < 7; i++) {
        const a = -0.5 + i * 0.3;
        line([[0.05 + Math.cos(a) * 0.3, -0.3 + Math.sin(a) * 0.2], [0.05 + Math.cos(a) * 0.42, -0.3 + Math.sin(a) * 0.3]], { lw: 1.2, color: INK_FAINT, passes: 1 });
      }
    },

    scale() {
      line([[0.0, 0.6], [0.0, -0.15]], { lw: 2.4 });
      line([[-0.55, -0.05], [0.55, -0.05]], { lw: 2.2 });
      circle(0.0, -0.1, 0.06, { lw: 1.8, passes: 1 });
      line([[-0.55, -0.05], [-0.55, 0.2]], { lw: 1.6, passes: 1 });
      line([[0.55, -0.05], [0.55, 0.2]], { lw: 1.6, passes: 1 });
      line([[-0.72, 0.2], [-0.38, 0.2]], { lw: 2 });
      line([[0.38, 0.2], [0.72, 0.2]], { lw: 2 });
      line([[-0.7, 0.2], [-0.72, 0.34], [-0.38, 0.34], [-0.4, 0.2]], { lw: 1.6, color: INK_SOFT, passes: 1 });
      line([[0.38, 0.2], [0.4, 0.34], [0.7, 0.34], [0.72, 0.2]], { lw: 1.6, color: INK_SOFT, passes: 1 });
      line([[-0.3, 0.6], [0.3, 0.6]], { lw: 2.6 });
      line([[-0.2, 0.68], [0.2, 0.68]], { lw: 2 });
    },

    sword() {
      line([[0.1, -0.6], [0.0, -0.05], [-0.02, 0.15]], { lw: 2.6 });
      line([[0.1, -0.6], [0.05, -0.05], [0.02, 0.15]], { lw: 1.4, color: INK_SOFT, passes: 1 });
      fill([[0.1, -0.6], [0.0, -0.05], [0.05, -0.05]], 'rgba(150,150,160,0.10)');
      line([[-0.25, 0.05], [0.22, -0.02]], { lw: 3 });
      line([[-0.02, 0.15], [0.05, 0.42]], { lw: 2.4 });
      circle(0.02, 0.45, 0.05, { lw: 1.6, passes: 1 });
      line([[-0.5, 0.6], [0.5, 0.6]], { lw: 1.4, color: INK_FAINT, passes: 1 });
      line([[0.15, -0.5], [0.28, -0.42]], { lw: 1.2, color: INK_FAINT, passes: 1 });
      line([[0.18, -0.3], [0.32, -0.22]], { lw: 1, color: INK_FAINT, passes: 1 });
    },
  };

  const draw = types[entry.sketch] || types.fossil;
  draw();
  return canvas;
}