如何使用 TikZ 绘制鸡蛋？

Question

我想绘制一个蛋形格式的元素，但我只找到了绘制椭圆的方法。

Answer 1

这是使用的唯一解决方案完美的(!) 鸡蛋的参数方程（参见蛋形曲线方程）：

• X=H× 0.78 × 余弦（吨× 0.25) × 正弦(吨）
• 是=H× 余弦(吨）

（在哪里H是鸡蛋的高度，吨位于[-π,π]）

\documentclass[margin=3mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
  \def\eggheight{3cm}
  \path[ball color=orange!60!gray]
  plot[domain=-pi:pi,samples=100]
  ({.78*\eggheight *cos(\x/4 r)*sin(\x r)},{-\eggheight*(cos(\x r))})
  -- cycle;
\end{tikzpicture}
\end{document}

编辑：第二个版本色彩更佳。

\documentclass[margin=3mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
  \def\eggheight{3cm}
  \path[preaction={fill=orange!50!white},
  ball color=orange!60!gray,fill opacity=.5]
  plot[domain=-pi:pi,samples=100]
  ({.78*\eggheight *cos(\x/4 r)*sin(\x r)},{-\eggheight*(cos(\x r))})
  -- cycle;
\end{tikzpicture}
\end{document}

Answer 2

和球阴影结构to[in=angle,out=angle]对此很有帮助：

代码

\documentclass[tikz,border=5mm]{standalone}
\begin{document}
\begin{tikzpicture}
\draw[looseness=0.75,ball color=orange!70!gray] (-2,0) arc (180:360:2) to[out=90,in=0] (0,3) to[out=180,in=90] (-2,0) -- cycle;
\end{tikzpicture}
\end{document}

结果

---

编辑1：我觉得这个布丁太夸张了。

代码

\documentclass[tikz,border=5mm]{standalone}
\begin{document}
\begin{tikzpicture}
\draw[looseness=0.9,ball color=orange!70!gray!50,draw=none] (-2,0) arc (180:360:2) to[out=90,in=0] (0,3) to[out=180,in=90] (-2,0) -- cycle;
\end{tikzpicture}
\end{document}

结果

---

编辑2：下列的敲击的想法，我加了几个雀斑：

代码

\documentclass[tikz,border=5mm]{standalone}

\begin{document}

\begin{tikzpicture}
    \colorlet{myEgg}{orange!70!gray!50}
    \draw[looseness=0.9,ball color=orange!70!gray!50,draw=none,clip] (-2,0) arc (180:360:2) to[out=90,in=0] (0,3) to[out=180,in=90] (-2,0) -- cycle;
    %\fill[blue] (-3,-3) rectangle (3,3);
    \foreach \x in {1,...,100}
    {   \pgfmathsetmacro{\rDot}{random()/50}
        \pgfmathsetmacro{\xCoo}{rand*2}
        \pgfmathsetmacro{\yCoo}{rand*2.5+0.5}
        \pgfmathsetmacro{\dColor}{100-60*sqrt(pow(\xCoo+0.5,2)+pow(\yCoo-1.4,2))/2.6}
        \fill[myEgg!\dColor!black] (\xCoo,\yCoo) circle (\rDot);
    }
\end{tikzpicture}

\end{document}

结果

---

编辑3：特殊要求ガベージコレクタ：这里有 512 只蛙卵（浸在水中）：

代码

\documentclass[tikz,border=5mm]{standalone}
\usepackage{xifthen}
\usepackage{fp}

\newcommand{\frogegg}[2]%
{ \draw[ball color=black!80] (#1) circle (#2*0.25cm);
    \draw[ball color=cyan!5!gray,opacity=0.1] (#1) circle (#2*1cm);
}

\pgfdeclarelayer{background layer}
\pgfsetlayers{background layer,main}

\begin{document}

\begin{tikzpicture}
[   x={(-27:1cm)},
    y={(203:1cm)},
    z={(95:1cm)},
]
\foreach \x in {0,...,7}
{ \foreach \y in {0,...,7}
    {   \foreach \z in {0,...,7}
        {   \pgfmathsetmacro{\xco}{\x+rand/3}
            \pgfmathsetmacro{\yco}{\y+rand/3}
            \pgfmathsetmacro{\zco}{\z+rand/3}
            \pgfmathsetmacro{\rad}{1+rand/3}
            \frogegg{\xco,\yco,\zco}{\rad}
        }
    }
}
\begin{pgfonlayer}{background layer}
    \fill[blue!50!gray] (current bounding box.south west) rectangle (current bounding box.north east);
\end{pgfonlayer}
\end{tikzpicture}

\end{document}

结果

Answer 3

快速修复 egreg 的 egg。感谢 MATLAB 运行如此缓慢。

我尝试寻找灰尘遮罩，但找不到能产生更逼真效果的东西。此外，阴影着色有点偏离，但原始渲染也不正确。

\documentclass[tikz]{standalone}
\usetikzlibrary{shadings}
\definecolor{eggshell}{RGB}{252,230,201}
\pgfdeclareradialshading{eggshading}{\pgfpoint{1cm}{1cm}}%
{color(0cm)=(eggshell!80);
color(0.5cm)=(brown!75!eggshell);
color(0.7cm)=(brown);
color(0.9cm)=(brown!70!black);
color(1.2cm)=(black)
}
\pgfdeclareradialshading{eggshadow}{\pgfpointorigin}%
{color(0cm)=(black);
color(2mm)=(gray!80);
color(3mm)=(gray!40);
%color(0.3cm)=(black!5!white);
color(7mm)=(white)
}

\begin{document}
\begin{tikzpicture}
\begin{scope}[yscale=0.93,transform shape]
    \node[xscale=2,yscale=0.3,shading=eggshadow,circle,minimum size=7mm] at (0,2.75mm){};
    \shade[shading=eggshading] (0,2.7mm)..controls (9mm,0.25cm) and (7mm,2cm)%
    ..(0,20.5mm)..controls(-7mm,2cm) and (-9mm,2.5mm)..(0,2.7mm)--cycle;
\end{scope}
    \node[anchor=south] at (2,0) {\includegraphics[height=2cm]{brownegg}};
\end{tikzpicture}
\end{document}

Answer 4

用 PSTricks 弄碎的鸡蛋。

\documentclass[pstricks,border=12pt]{standalone}
\begin{document}
\begin{pspicture}(4.5,4.5)
    \pscircle*[linecolor=orange](2,2){1}
    \psccurve(0.5,0.5)(0.25,2)(1,3)(2,4)(4,4)(4.5,3)(4,1)(0.8,0.2)(0.5,0.5)
\end{pspicture}
\end{document}

动画版：

在煎锅上……

\documentclass[pstricks]{standalone}
\usepackage{pst-node,pst-plot}

\begin{document}
\pstVerb{realtime srand}%
\psLoop{25}{%
\begin{pspicture}(-2,-2)(2,2)
    \pscircle*[linecolor=orange]{0.75}
    \curvepnodes[plotpoints=73]{0}{360}{rand 101 mod 1000 div 1.50 add t PtoC}{P}
    \def\points{}%
    \multido{\i=0+1}{\Pnodecount}{\xdef\points{\points (P\i)}}
    \expandafter\psccurve\points
\end{pspicture}}
\end{document}