Mein LaTeX-Forum

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{shapes,backgrounds}
\newcommand{\tstar}[5]{% inner radius, outer radius, tips, rot angle, options
   \pgfmathsetmacro{\starangle}{360/#3}
   \draw[#5] (#4:#1)
   \foreach \x in {1,...,#3}
   { -- (#4+\x*\starangle-\starangle/2:#2) -- (#4+\x*\starangle:#1)
   }
   -- cycle;
}

\begin{document}
   \begin{tikzpicture}
   \tstar{2}{4}{5}{-17}{thick,fill, top color=black, bottom color=yellow, middle color=red};
   \end{tikzpicture}
\end{document}

\documentclass[margin=5pt]{standalone}
\usepackage{tikz}
\newcommand{\tstar}[5]{% inner radius, outer radius, tips, rot angle, options
   \pgfmathsetmacro{\starangle}{360/#3}
   \path[#5]% eventuell path statt draw
  (#4:#1)
   \foreach \x in {1,...,#3}
   { -- (#4+\x*\starangle-\starangle/2:#2) -- (#4+\x*\starangle:#1)
   }
   -- cycle;
}

\begin{document}
\begin{tikzpicture}
  \tstar{2}{4}{5}{-17}{
    thick,
    %draw,
    path picture={%
      \path(current path bounding box.north west)--(current path bounding box.south east)
        coordinate[pos=0]    (temp1)
        coordinate[pos=.3333](temp2)
        coordinate[pos=.6666](temp3)
        coordinate           (temp4)
      ;
      \fill[black]  (temp1)        rectangle (temp2-|temp4);
      \fill[red]    (temp1|-temp2) rectangle (temp3-|temp4);
      \fill[yellow] (temp1|-temp3) rectangle (temp4);
    }
  }
\end{tikzpicture}
\end{document}

\documentclass[margin=5pt]{standalone}
\usepackage{tikz}
\newcommand{\tstar}[5]{% inner radius, outer radius, tips, rot angle, options
   \pgfmathsetmacro{\starangle}{360/#3}
   \path[#5]% eventuell path statt draw
   (#4:#1)
   \foreach \x in {1,...,#3}
   { -- (#4+\x*\starangle-\starangle/2:#2) -- (#4+\x*\starangle:#1)
   }
   -- cycle;
}

\begin{document}

   \begin{tikzpicture}
   \tstar{2}{5}{5}{180}{
      thick,
      rotate=90,  
      draw,
      path picture={%
         \path(current path bounding box.north west)--(current path bounding box.south east)
         coordinate[pos=0]    (temp1)
         coordinate[pos=.375](temp2) %Anpassung der Position an der oberen Sternbreite, nicht mathematisch genau 1/3.
         coordinate[pos=.625](temp3)
         coordinate           (temp4)
         ;
         \fill[blue]  (temp1)        rectangle (temp2-|temp4);
         \fill[yellow]    (temp1|-temp2) rectangle (temp3-|temp4);
         \fill[red] (temp1|-temp3) rectangle (temp4);
      }
   }
   \end{tikzpicture}          
\end{document}

\documentclass[margin=5pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes}

\begin{document}
\begin{tikzpicture}
\node [name=D,star,star point height=.5cm, minimum size=2cm] at (1,1){};
\fill[black] (D.outer point 2) -- (D.inner point 1) -- (D.outer point 1) -- (D.inner point 5) -- (D.outer point 5);
\fill[red] (D.outer point 2) -- (D.outer point 5) -- (D.inner point 4) -- (D.inner point 2);
\fill[yellow] (D.inner point 2) -- (D.inner point 4) -- (D.outer point 4) -- (D.inner point 3) -- (D.outer point 3);
\end{tikzpicture}

\begin{tikzpicture}
\node [name=R,star,star point height=.5cm, minimum size=2cm] at (1,1){};
\fill[blue] (R.inner point 1) -- (R.outer point 2) -- (R.inner point 2) -- (R.outer point 3) -- ([yshift=-1.07cm]R.inner point 1);
\fill[yellow] (R.inner point 1) -- (D.north) -- (D.inner point 5) -- ([yshift=-1.07cm]D.inner point 5) -- (R.south) -- ([yshift=-1.07cm]R.inner point 1);
\fill[red] (R.inner point 5) -- (R.outer point 5) -- (R.inner point 4) -- (R.outer point 4) -- ([yshift=-1.07cm]R.inner point 5);
\end{tikzpicture}
\end{document}
   

\documentclass[tikz, border=1pt]{standalone}
\usetikzlibrary{shapes, intersections}

\begin{document}
\begin{tikzpicture}
\node [name=R, star, star point height=.5cm, minimum size=2cm] {};

\path [name path=left vertical] (R.inner point 1) |- (R.outer point 3);
\path [name path=left diagonal] (R.south) -- (R.outer point 3);
\path [name intersections={of=left vertical and left diagonal, by=left intersection}];

\path [name path=right vertical] (R.inner point 5) |- (R.outer point 4);
\path [name path=right diagonal] (R.south) -- (R.outer point 4);
\path [name intersections={of=right vertical and right diagonal, by=right intersection}];

\fill [blue] (R.inner point 1) -- (R.outer point 2) -- (R.inner point 2) -- (R.outer point 3) -- (left intersection);
\fill [yellow] (R.inner point 1) -- (R.north) -- (R.inner point 5) -- (right intersection) -- (R.south) -- (left intersection);
\fill [red] (R.inner point 5) -- (R.outer point 5) -- (R.inner point 4) -- (R.outer point 4) -- (right intersection);
\end{tikzpicture}
\end{document}