平行四边形TikZ作图

  %!TEX program = pdflatex

 \documentclass[varwidth=true, border=2pt]{standalone}

 \usepackage{tikz}

 \usepackage{mathpazo}

 \usetikzlibrary{arrows}

 \usetikzlibrary{decorations.markings}

 \begin{document}

 \begin{tikzpicture}[x=.5cm,y=.5cm]

 \draw [<->,>=stealth'] (0,8) node [label = left:{$y$}]{} -- (0,0) -- (12,0) node[label = below:{$x$}]{};

     grid[xstep=.5cm, ystep=.5cm] (,);

     \draw (,) -- (5*1.414,0) -- (5+5*1.414,5) -- (5,5) -- cycle;

     \draw[fill=green!] (,) -- (5*1.414,0) -- (5+5*1.414,5) -- (5,5) -- cycle;

     \draw (,)node[label = below:{$(,)$}]{};

     \draw (*1.414,)node[label = below:{$(\sqrt{},)$}]{};

     \draw (+*1.414,)node[label = above:{$(\sqrt{}+,)$}]{};

     \draw (,)node[label = above:{$(,)$}]{};

   \end{tikzpicture}

 \end{document}

Parallelogram Drawing