Btukfyl

I'm a beginner at latex and I've been reading everything I found about curl braces. I managed to positioned it where I wanted it but now my curly brace appears as a straight line. When I write the code in a new different file with just this diagram, the curly brace shows, only in another position. what can I do to fix it? Thanks!!

 documentclass{beamer}

 usetheme{Frankfurt}

 setbeamercovered{transparent}

 usepackage{pgf,tikz}

 usetikzlibrary{positioning, arrows, automata}



 begin{document}

    scalebox{1.1}

    {

    begin{tikzpicture}

    [node distance= 1cm,auto,

    every node/.style={text=white,rounded corners=0.05cm},

    grande/.style={rectangle,  fill=green!60!blue, font=large, minimum width= 7cm, minimum height=0.8cm},

    peque/.style={rectangle, fill=green!30!black, font=large, minimum width=3.5cm, minimum height= 0.4cm}]



    node[grande, xshift=1.5cm]  (oracion){Oración};

    node[grande, below of=oracion] (evento) {Evento};

    node[grande, below of=evento] (EPA) {EPA};



    node[peque, below of= EPA, anchor=east, minimum width=3.5cm](syntax){Sintaxis};

    node[peque, right=0.03cm of syntax,minimum width=3.5cm](semantics){Semántica};

    node[peque, below of=syntax, yshift=0.4cm](funciones){scriptsize F. sintácticas};

    node[peque, right=0.03cm of funciones, minimum width=1.73cm, yshift=0cm](roles){tiny R. temáticos};

    node[peque, right=0.03cm of roles, minimum width=1.73cm](rasgos){tiny R. semánticos};



    draw [decorate,decoration={brace,amplitude=10pt},xshift=-0.5cm,yshift=-5cm] (-2,1.0) -- (-2,2.5) node [black,midway,xshift=-0.6cm, yshift=0cm]  {footnotesize Diátesis};



    end{tikzpicture}}

end{document}

You need to load decorations.pathreplacing library to use the decoration.

documentclass{beamer}

usetheme{Frankfurt}

 setbeamercovered{transparent}

 usepackage{pgf,tikz}

 usetikzlibrary{positioning, arrows, automata, decorations.pathreplacing}



 begin{document}

    scalebox{1.1}

    {

    begin{tikzpicture}

    [node distance= 1cm,auto,

    every node/.style={text=white,rounded corners=0.05cm},

    grande/.style={rectangle,  fill=green!60!blue, font=large, minimum width= 7cm, minimum height=0.8cm},

    peque/.style={rectangle, fill=green!30!black, font=large, minimum width=3.5cm, minimum height= 0.4cm}]



    node[grande, xshift=1.5cm]  (oracion){Oración};

    node[grande, below of=oracion] (evento) {Evento};

    node[grande, below of=evento] (EPA) {EPA};



    node[peque, below of= EPA, anchor=east, minimum width=3.5cm](syntax){Sintaxis};

    node[peque, right=0.03cm of syntax,minimum width=3.5cm](semantics){Semántica};

    node[peque, below of=syntax, yshift=0.4cm](funciones){scriptsize F. sintácticas};

    node[peque, right=0.03cm of funciones, minimum width=1.73cm, yshift=0cm](roles){tiny R. temáticos};

    node[peque, right=0.03cm of roles, minimum width=1.73cm](rasgos){tiny R. semánticos};



    draw [decorate,decoration={brace,amplitude=10pt},xshift=-0.5cm,yshift=-5cm] (-2,1.0) -- (-2,2.5) node [black,midway,xshift=-0.6cm, yshift=0cm]  {footnotesize Diátesis};



    end{tikzpicture}}

end{document}

off-topic (sine your main problem is solved by @JouleV answer), but it can be helpful:

• image is enclosed in frame environment (since you use beamer document class


• for positioning of nodes is used syntax from the positioning packages


• used are only relative coordinates,


• nodes are in two chains


• in nodes are used only two different font sizes and their definition is moved inside nodes styles


• 
  

  for brace is used calligraphic brace defined in the package calligraphy

  
  
  

  documentclass{beamer}
  
  usetheme{Frankfurt}
  
  setbeamercovered{transparent}
  
  usepackage{tikz}
  
  usetikzlibrary{arrows, automata,
  
                  calc, chains,
  
                  decorations.pathreplacing,
  
                  calligraphy,
  
                  positioning}
  
  
  
  begin{document}
  
  begin{frame}[fragile]
  
  frametitle{My image}
  
      begin{tikzpicture}[
  
       node distance = 2mm and 1mm,
  
         start chain = A going right,
  
         start chain = B going above,
  
         base/.style = {rounded corners=0.5mm, text=white},
  
       grande/.style = {base, fill=green!60!blue, font=large,
  
                        minimum width=87mm, minimum height=8mm,
  
                        on chain=B},
  
   peque/.style args = {#1/#2}{base, fill=green!30!black,
  
                               minimum width=#1, minimum height= 5mm,
  
                               font=#2,
  
                               on chain=A},
  
           BC/.style = {decorate,
  
              decoration={calligraphic brace, amplitude=5pt,
  
              pre =moveto, pre  length=1pt,
  
              post=moveto, post length=1pt,
  
              raise=5pt}, % for mirroring of brace
  
              very thick,
  
              pen colour=black},
  
                         ]
  
  node[peque=43mm/scriptsize]   (funciones) {F. sintácticas};
  
  node[peque=21mm/scriptsize]               {R. temáticos};
  
  node[peque=21mm/scriptsize]               {R. semánticos};
  
  node[peque=43mm/large,
  
        above=of funciones]       (syntax)    {Sintaxis};
  
  node[peque=43mm/large]        (semantics) {Semántica};
  
  node[grande,
  
        above=of $(syntax.north)!0.5!(semantics.north)$]  {EPA};
  
  node[grande]   {Evento};
  
  node[grande]   {Oración};
  
  %
  
  draw[BC]   (funciones.south west) --
  
            node[left=9pt,font=footnotesize] {Diátesis}
  
              (syntax.north west);
  
      end{tikzpicture}
  
  end{frame}