Cfrgtkky

There are two things wrong with the qtree version of the MWE. What I want is to have three nodes horizontally aligned (the root 1SA, the 1st level child "0--7 HL" and the second level child "Various distributions4") and having straight line connectors with the same y-coordinate so that they look like a single straight line. In the more complex source from which I've extracted the MWE, the first two happen automatically since there is only one 1st level child - somehow I've turned the latter into a second level child in preparing the MWE :-(

I'm including a forest version where that problem is resolved but horizontal alignment is still an issue.

Qtree MWE:

RequirePackage{tikz}

RequirePackage{tikz-qtree}

usetikzlibrary{fit, positioning, shapes, trees}



documentclass{article}



begin{document}

tikzset{frontier/.style={distance from root=10baselineskip}}

tikzset{edge from parent/.style= 

            {draw, edge from parent fork right},

            every tree node/.style = 

            {anchor=base west, shape=rectangle, rounded corners, draw=red, align=left, top color=white, bottom color=blue!20, minimum width = 2mm, minimum height = 4mm}

            }



begin{tikzpicture}[thick, every node/.style={transform shape}, grow=right]

begin{scope}[font=small, color=black, ultra thick, node distance=25mm, level distance=25mm, sibling distance=5mm]

Tree         

    [.{1SA} 

        [node (1) {0--7 HL};

            [.{underline{textbf{Various distributions1}}\Stayman Takis} ]

            [.{underline{textbf{Various distributions2 }}\Texas} ]

            [.{underline{textbf{Various distributions3}}\Stayman normal, if a single major\Texas, otherwise} ]

            [node (2) [right=of 1] {underline{textbf{Various distributions4}}\Pass, with bad suit\Texas, otherwise}; ]

            [.{underline{textbf{Various distributions5}}\Pass, 0--4 HL\Texas M 5--7 HL} ]

            [.{underline{textbf{Various distributions6}}\Pass, 0--4 HL\Texas M 5--7 HL} ]

            [.{underline{textbf{Various distributions7}}\Pass} ]

        ] 

    ]

end{scope}

end{tikzpicture}

end{document}

Forest MWE:

RequirePackage{tikz}

usetikzlibrary{fit, positioning, shapes, trees}

RequirePackage[edges]{forest}



documentclass{article}



begin{document}   

begin{forest}  

for tree={rounded corners,

grow'=0, l=0, l sep=2em, 

         child anchor=west, anchor=west,  

          parent anchor=east, 

          tier/.pgfmath=level(),

         shape=rectangle, rounded corners, draw=red, align=left, top color=white, bottom color=blue!20, minimum width = 2mm, minimum height = 4mm,

          edge path={noexpandpath[forestoption{edge}](!u.parent anchor)|-(.child anchor)forestoption{edge label};},

          }

[{1SA}, calign=child,  calign child=2

        [{0--7 HL}

            [{underline{textbf{Various distributions1}}\Stayman Takis} ]

            [{underline{textbf{Various distributions2}}\Texas} ]

            [{underline{textbf{Various distributions3}}\Stayman normal, if a single major\Texas, otherwise} ]

            [{underline{textbf{Various distributions4}}\Pass, with bad suit\Texas, otherwise} ]

            [{underline{textbf{Various distributions5}}\Pass, 0--4 HL\Texas M 5--7 HL} ]

            [{underline{textbf{Various distributions6}}\Pass, 0--4 HL\Texas M 5--7 HL} ]

            [{underline{textbf{Various distributions7}}\Pass} ]

        ] 

    ]

end{forest}

end{document}

To get the horizontal alignment, one needs to specify calign=child for the second level as well. In the code below I simply set it for the entire tree.

Actually, the code sets calign=child edge. This yields the desired result even when child/parent anchor differs from anchor. (calign=child aligns anchors, while calign=child edge aligns parent anchor and child anchor.)

I have also included the automatic computatation of the middle child: calign child=(n_children()+1)/2. (Maybe having calign=mid-child and calign=mid-child edge is not a bad idea?)

RequirePackage{tikz}

usetikzlibrary{fit, positioning, shapes, trees}

RequirePackage[edges]{forest}



documentclass{article}



begin{document}   

begin{forest}  

for tree={rounded corners,

grow'=0, l=0, l sep=2em, 

         child anchor=west, anchor=west,  

         parent anchor=east, 

         tier/.pgfmath=level(),

         shape=rectangle, rounded corners, draw=red, align=left, top color=white, bottom color=blue!20, minimum width = 2mm, minimum height = 4mm,

         edge path={noexpandpath[forestoption{edge}](!u.parent anchor)|-(.child anchor)forestoption{edge label};},

         calign=child edge, calign child=(n_children()+1)/2,

          }

[{1SA}, 

        [{0--7 HL}, 

            [{underline{textbf{Various distributions1}}\Stayman Takis} ]

            [{underline{textbf{Various distributions2}}\Texas} ]

            [{underline{textbf{Various distributions3}}\Stayman normal, if a single major\Texas, otherwise} ]

            [{underline{textbf{Various distributions4}}\Pass, with bad suit\Texas, otherwise} ]

            [{underline{textbf{Various distributions5}}\Pass, 0--4 HL\Texas M 5--7 HL} ]

            [{underline{textbf{Various distributions6}}\Pass, 0--4 HL\Texas M 5--7 HL} ]

            [{underline{textbf{Various distributions7}}\Pass} ]

        ] 

    ]

end{forest}

end{document}