Kdtyjb

I use this manual for help with the drawing of game trees using TikZ (http://www.sfu.ca/~haiyunc/notes/Game_Trees_with_TikZ.pdf).

However, I have a challenge I cannot seem to overcome. Some of my end-nodes require line breaks in the labels. In the concrete example below, in the end node on the left in the second branch (after "Not Resist"), I would like the equation after the two vertical lines (||) to be placed below the first equation. In other words split the line between the X and the U_S.

I have tried by specifying "align=centre" and using \ but it did not work. Similarly, I tried specifying an equation environment within the label, but it did not work either.

Any help would be most appreciated.

An MWE:

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{tikz}

begin{document}



tikzset{

    solid node/.style={circle,draw,inner sep=1.5,fill=black},

    hollow node/.style={circle,draw,inner sep=1.5}

}



begin{tikzpicture}[scale=1.5,font=footnotesize]

    tikzstyle{level 1}=[level distance=15mm, sibling distance=20mm]

    tikzstyle{level 2}=[level distance=15mm, sibling distance=20mm]

          node(0)[solid node,label=above:{textbf{Sender}}]{}

              child{node(1)[hollow node, label=below:{$U_S(SQ)$}]{}

              edge from parent node[left,xshift=-3,yshift=5]{textit{Not Threaten}}

              }

              child{node(2)[solid node, label=above right:{textbf{Target}}]{}

                  child{node[hollow node, label=below:{$U_S(TS)=X$ \ $||U_T(TS)=Y$}]{} edge from parent node[left,xshift=-3,yshift=0]{textit{Not Resist}}}

                  child{node[hollow node, label=below:{$TF$}]{} edge from parent node[right,xshift=3,yshift=0]{textit{Resist}}}

                  edge from parent node[right,xshift=3,yshift=5]{textit{Threaten}}

                  };

  end{tikzpicture}



end{document}

You may use makecell:

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{tikz}

usepackage{makecell}

begin{document}



tikzset{

    solid node/.style={circle,draw,inner sep=1.5,fill=black},

    hollow node/.style={circle,draw,inner sep=1.5}

}



begin{tikzpicture}[scale=1.5,font=footnotesize]

    tikzstyle{level 1}=[level distance=15mm, sibling distance=20mm]

    tikzstyle{level 2}=[level distance=15mm, sibling distance=20mm]

          node(0)[solid node,label=above:{textbf{Sender}}]{}

              child{node(1)[hollow node, label=below:{$U_S(SQ)$}]{}

              edge from parent node[left,xshift=-3,yshift=5]{textit{Not Threaten}}

              }

              child{node(2)[solid node, label=above right:{textbf{Target}}]{}

                  child{node[hollow node, label=below:{makecell{$U_S(TS)=X$ \ $||U_T(TS)=Y$}}]{} edge from parent node[left,xshift=-3,yshift=0]{textit{Not Resist}}}

                  child{node[hollow node, label=below:{$TF$}]{} edge from parent node[right,xshift=3,yshift=0]{textit{Resist}}}

                  edge from parent node[right,xshift=3,yshift=5]{textit{Threaten}}

                  };

  end{tikzpicture}



end{document}

Stack it!

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{stackengine}

usepackage{tikz}

begin{document}



tikzset{

    solid node/.style={circle,draw,inner sep=1.5,fill=black},

    hollow node/.style={circle,draw,inner sep=1.5}

}



begin{tikzpicture}[scale=1.5,font=footnotesize]

    tikzstyle{level 1}=[level distance=15mm, sibling distance=20mm]

    tikzstyle{level 2}=[level distance=15mm, sibling distance=20mm]

          node(0)[solid node,label=above:{textbf{Sender}}]{}

              child{node(1)[hollow node, label=below:{$U_S(SQ)$}]{}

              edge from parent node[left,xshift=-3,yshift=5]{textit{Not Threaten}}

              }

              child{node(2)[solid node, label=above right:{textbf{Target}}]{}

                  child{node[hollow node, label=below:{stackunder{$U_S(TS)=X ||$}{%

                     $U_T(TS)=Y$}}]{} edge from parent node[left,xshift=-3,yshift=0]{textit{Not Resist}}}

                  child{node[hollow node, label=below:{$TF$}]{} edge from parent node[right,xshift=3,yshift=0]{textit{Resist}}}

                  edge from parent node[right,xshift=3,yshift=5]{textit{Threaten}}

                  };

  end{tikzpicture}



end{document}

If you want it aligned, tabstack it (note: for some reason, the || needed additional grouping inside the slignstackunder):

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{tabstackengine}

stackMath

usepackage{tikz}

begin{document}



tikzset{

    solid node/.style={circle,draw,inner sep=1.5,fill=black},

    hollow node/.style={circle,draw,inner sep=1.5}

}



begin{tikzpicture}[scale=1.5,font=footnotesize]

    tikzstyle{level 1}=[level distance=15mm, sibling distance=20mm]

    tikzstyle{level 2}=[level distance=15mm, sibling distance=20mm]

          node(0)[solid node,label=above:{textbf{Sender}}]{}

              child{node(1)[hollow node, label=below:{$U_S(SQ)$}]{}

              edge from parent node[left,xshift=-3,yshift=5]{textit{Not Threaten}}

              }

              child{node(2)[solid node, label=above right:{textbf{Target}}]{}

                  child{node[hollow node, label=below:{alignstackunder{U_S(TS)=&X {||}}{%

                     U_T(TS)=&Y}}]{} edge from parent node[left,xshift=-3,yshift=0]{textit{Not Resist}}}

                  child{node[hollow node, label=below:{$TF$}]{} edge from parent node[right,xshift=3,yshift=0]{textit{Resist}}}

                  edge from parent node[right,xshift=3,yshift=5]{textit{Threaten}}

                  };

  end{tikzpicture}



end{document}

You can use amsmath and gathered; the reason for ! is explained elsewhere in the site.

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{amsmath}

usepackage{tikz}

begin{document}



tikzset{

  solid node/.style={circle,draw,inner sep=1.5,fill=black},

  hollow node/.style={circle,draw,inner sep=1.5}

}



begin{tikzpicture}[scale=1.5,font=footnotesize]

tikzset{

  level 1/.style={level distance=15mm, sibling distance=20mm},

  level 2/.style={level distance=15mm, sibling distance=20mm},

}

node(0)[solid node,label=above:{textbf{Sender}}]{}

  child{

    node(1)[hollow node, label=below:{$U_S(SQ)$}]{}

    edge from parent node[left,xshift=-3,yshift=5]{textit{Not Threaten}}

  }

  child{

    node(2)[solid node, label=above right:{textbf{Target}}]{}

    child{

      node[hollow node, label=below:{

        $!begin{gathered}U_S(TS)=X \ ||U_T(TS)=Yend{gathered}$}]{} 

      edge from parent node[left,xshift=-3,yshift=0]{textit{Not Resist}}}

      child{

        node[hollow node, label=below:{$TF$}]{} 

        edge from parent node[right,xshift=3,yshift=0]{textit{Resist}}}

        edge from parent node[right,xshift=3,yshift=5]{textit{Threaten}}

  };

end{tikzpicture}



end{document}

Note that tikzstyle is deprecated.

you only need add to label style align=center:

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{tikz}



tikzset{

    solid node/.style={circle,draw,inner sep=1.5,fill=black},

    hollow node/.style={circle,draw,inner sep=1.5},

    every label/.append style={align=center}% <--- added

}

begin{document}



begin{tikzpicture}[scale=1.5,font=footnotesize]

    tikzstyle{level 1}=[level distance=15mm, sibling distance=20mm]

    tikzstyle{level 2}=[level distance=15mm, sibling distance=20mm]

          node(0)[solid node,label=above:{textbf{Sender}}]{}

              child{node(1)[hollow node, label=below:{$U_S(SQ)$}]{}

              edge from parent node[left,xshift=-3,yshift=5]{textit{Not Threaten}}

              }

              child{node(2)[solid node, label=above right:{textbf{Target}}]{}

                  child{node[hollow node, label=below:{$U_S(TS)=X$ \ $||U_T(TS)=Y$}]{} edge from parent node[left,xshift=-3,yshift=0]{textit{Not Resist}}}

                  child{node[hollow node, label=below:{$TF$}]{} edge from parent node[right,xshift=3,yshift=0]{textit{Resist}}}

                  edge from parent node[right,xshift=3,yshift=5]{textit{Threaten}}

                  };

  end{tikzpicture}

end{document}

Edit: istgame v2.0 (codes improved for tree parts)

With the istgame v2.0, you can easily control the input modes and fonts for important labels using a new macro setistmathTF*.

documentclass{standalone}



usepackage{istgame}

usepackage{makecell}



begin{document}



begin{istgame}[scale=1.5,font=footnotesize]

setistmathTF*001<textbf>

xtShowEndPoints[oval node]

setistSolidNodeStyle{4pt}

xtdistance{15mm}{20mm}

istroot(0){Sender}

  istb{Not Threaten}[al]{U_S(SQ)}

  istb*{Threaten}[ar]

  endist

istroot(1)(0-2)<45>{Target}

  istb{Not Resist}[al]{mbox{makecell{$U_S(TS)=X$\$|U_T(TS)=Y$}}}

  istb{Resist}[ar]{TF}

  endist

end{istgame}



end{document}

Original answer (istgame v1.0)

This is an example that uses the istgame package to draw the game tree and the makecell pacakage for the line break.

documentclass{standalone}



usepackage{istgame}

usepackage{makecell}



begin{document}



begin{istgame}[scale=1.5,font=footnotesize]

xtShowEndPoints[oval node]

setistSolidNodeStyle{4pt}

xtdistance{15mm}{20mm}

istroot(0)

  istb{Not Threaten}[al]{U_S(SQ)}

  istb*{Threaten}[ar]

  endist

istroot(1)(0-2)

  istb{Not Resist}[al]{mbox{makecell{$U_S(TS)=X$\$|U_T(TS)=Y$}}}

  istb{Resist}[ar]{TF}

  endist

xtOwner(0){textbf{Sender}}

xtOwner(1){textbf{Target}}[ar]

end{istgame}



end{document}