Drawing tree in latex with horizontal bars

Question

I want to draw the following tree in latex. But, I don't know how to do it. Over searching on internet I found other kinds of tree but not this kind. I will be glad if someone can help me drawing this.

Answer 1

With the forest package and the edges library you can use the option forked edges.

\documentclass{article}
\usepackage{forest}
\useforestlibrary{edges}
\begin{document}
\begin{forest}
forked edges
[Constraint
    [Holonomic
        [Rhenomic][Scleronomic]
    ]
    [Non-holonomic]
]
\end{forest}
\end{document}

Equivalently, you can place forked edge in a for tree, which also allows you to control fork sep and many other options:

\documentclass{article}
\usepackage{forest}
\useforestlibrary{edges}
\begin{document}
\begin{forest}
for tree={
forked edge, fork sep=2.5mm, s sep=5mm
}
[Constraint
    [Holonomic
        [Rhenomic][Scleronomic]
    ]
    [Non-holonomic]
]
\end{forest}
\end{document}