Graphics, Figures & Tables ⇒ Filling of bounded area - Tikz

[TobiWanKenobias]

Hello

Can someone help me cut this brown area, so it is only inside the dashed lines?

Code: Select all

\documentclass{memoir}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
    \draw[style=help lines] (-0.5,-0.2) grid (8,6.5);
    \centering
    \clip(-0.5,-0.2) rectangle (8,6.5);
    \draw[black,very thick,-latex] (-0.2,0) -- (7,0) node[right] {$x_1$}; 
    \draw[black,very thick,-latex] (0,-0.2) -- (0,6) node[left] {$x_2$};
    
    %Line :
    \draw [dashed,thin] plot [smooth, tension=1] coordinates {(0.2,5)  (3.15,5.5)  (6.5,5)};
    \draw [dashed,thin] plot [smooth, tension=1] coordinates {(5.7,5.7)  (5.5,3)  (4.5,0.1)};
    \draw [dashed,thin] plot [smooth, tension=1] coordinates {(-0.2,3)  (2.65,1.1)  (5.5,0.4)};
    \draw [dashdotted,thin] plot [smooth, tension=1] coordinates {(0.5,0)  (0.5,6.2)};
    \draw [dashdotted,thin] plot [smooth, tension=1] coordinates {(0,1)  (8,1)};
    
    \fill[color=brown, opacity=0.3] (0.5,1) rectangle (6,6) ;
    
    %Text :
    \draw[black,ultra thin] (0.5,4) -- (2,6) node[above] {Side constraint};
    \draw[black,ultra thin] (5.3,2) -- (5.8,1.5) node[right,text width=2cm] {Behaviour constraint};
    \draw[black, ultra thin] (3,3.75) -- (3,3.75) node[below] {Feasible region};
\end{tikzpicture}
\end{document}

[Bartman]

I'm not sure what effect you're hoping for from the \centering command at this place.

My proposed solution uses Mr. Feuersänger's answer to a related question from a German-speaking forum.

Since the first and third curves don't intersect, the adopted source code leads to an error message, which also offers the solution right away.

I chose the same class as the answerer in order to limit the output to the essentials. The example should also create the same drawing with your class.

Code: Select all

\documentclass{standalone}
\usepackage{pgfplots}

\pgfplotsset{compat=1.18}

\usepgfplotslibrary{fillbetween}
\usetikzlibrary{arrows.meta,backgrounds}

\begin{document}
\begin{tikzpicture}[>=Latex]
\draw[style=help lines] (-0.5,-0.2) grid (8,6.5);
\path[very thick,->,at end] 
  (-0.2,0) edge node[right] {$x_1$} (7,0)
  (0,-0.2) edge node[left] {$x_2$} (0,6)
;
        
%Line :
\begin{scope}[dashed,smooth,tension=1]
\draw [name path global=curve1] plot coordinates {(0.2,5)  (3.15,5.5)  (6.5,5)};
\draw [name path global=curve2] plot coordinates {(5.7,5.7)  (5.5,3)  (4.5,0.1)};
\draw [name path global=curve3] plot coordinates {(-0.2,3)  (2.65,1.1)  (5.5,0.4)};
\end{scope}
	
\draw [dashdotted] 
  (0.5,0) -- (0.5,6.2) coordinate (above left)
  (0,1) -- (8,1) coordinate (below right)
;
    
\path [
  name path=1and3,
  intersection segments={
    of=curve1 and curve3,
    sequence={A*[reverse] -- B*}% changed
  }
];
   
\begin{scope}[on background layer]
\clip (above left) rectangle (below right);% added
\fill [
  brown, 
  opacity=0.3,
  intersection segments={
    of=1and3 and curve2,
    sequence={A1 -- B1[reverse]}
  }
];
\end{scope}
    
%Text :
\draw [ultra thin] 
  (0.5,4) -- (2,6) node [above] {Side constraint}
  (5.3,2) -- (5.8,1.5) node [right,align=left] {Behaviour\\constraint}
  (3,3.75) node [below] {Feasible region}
;
\end{tikzpicture}
\end{document}