You have to put the node
at appropriate places:
\draw[red,line width=1pt,smooth, tension=1.9,samples=1000] (2.13,5.1) --
node[sloped,inner sep=0cm,above,pos=.5, anchor=south west,
minimum height=2cm,minimum width=1cm](N){}(2.86,6.4) -- (3.62,7.5) -- (4.42,8.4) --
(5.30,9.1) -- (6.34,9.6) -- (7.13,9.8) -- (8.42,9.9)node[black,above,anchor=west]
{Frontwant};
You can use rounded corners=<dimension>
. Choose proper <dimension>
.
Using calc
library, add x
value to (N.east)
. Reverse the arrow direction:
\path (N.south west) edge[stealth-,red!50!black,shorten <=2pt] ($(N.east) +
(0.3,0)$) node[above=1.4cm] {$\hat{S}$};
Change 0.3
in ($(N.east) + (0.3,0)$)
to suit the angle you want.
With all the above, and lot of additions, the full code:
\documentclass[]{scrartcl}
\usepackage{tikz}
\usetikzlibrary{arrows,calc,positioning}
\begin{document}
\begin{tikzpicture}[allow upside down, scale=1]
%(0,0)(0.70,1.9)(1.41,3.6)
%\draw plot [smooth, tension=0.5] coordinates{(2.13,5.1)(2.86,6.4)(3.62,7.5)(4.42,8.4)(5.30,9.1)(6.34,9.6)(7.13,9.8)(8.42,9.9)}
\draw [red,line width=1pt,smooth, tension=1.9,samples=1000,rounded corners=15pt] (2.13,5.1) -- node[sloped,inner sep=0cm,above,pos=.5,
anchor=south west,
minimum height=1cm,minimum width=0.5cm](N){}(2.86,6.4) -- (3.62,7.5) -- (4.42,8.4) -- (5.30,9.1) -- (6.34,9.6) -- (7.13,9.8) -- (8.42,9.9)node[black,above,anchor=west] {Frontwand}
;
%% vectors
\path (N.south west)
edge[-stealth,blue] node[below,pos=0.9] {$\vec{ n}$} (N.north west);
\path (N.south west) edge[stealth-,red!50!black,shorten <=2pt] node[above,pos=1,text=red!50!black] {$\hat{S}$ } ($(N.east) + (0,0.5)$);
%% horizontal lines and coordinates...
\path[draw,red!70!green] ($(N.south west) + (-2,0)$) -- ($(N.south west) + (7,0)$)node[coordinate, pos=0] (a){} node[coordinate,pos=1,label=right:{\color{black}$z$}] (b){} node[pos=.3,above=-0.1cm,black] {$A(z)$};
\path[draw,red!70!green] (a |- 2.86,6.4 ) -- (b |- 2.86,6.4)node[pos=1,anchor=west,black](c) {$z-1$}node[pos=.38,above=-0.1cm,black] {$A(z-1)$};
%% Co ordinate system
\node [right=1.5cm of b,scale=0.9] (O) {$\bigotimes$};
\draw[-latex](O.center) -- (c -| O)node[above]{$z$};
\draw[-latex](O.center) -- +(0:.7cm)node[right]{$x$};
\draw[-latex,shorten >= -5pt] (O.center) -- (O.north east) node[pos=1.8]{$y$};
\fill (N.south west) circle (2pt);
\fill (2.86,6.4) circle (2pt);
\end{tikzpicture}
\end{document}

While I did not optimize the code, lot of typing could have been saved. I left it more verbose.