Making multiple lines connected by nodes to appear as one continuous line?

Question

I've never used TikZ and certainly not for drawing graphs. Based on your experience with TikZ, would you say I shouldn't try to draw the graph below with it?

Look at the combinations of lines consisting of an arrowed line, a dotted line and a line ending with a black dot (e.g. there's one between A1 and Q1). I assume that I could draw such by drawing 3 different lines, but can I keep them aligned so that they would appear as a straight and continuous path? Or will there be visible joints?

I'd prefer simplicity, so it might be easiest to somehow group lines together, but is that even possible?

Answer 1

If you are going to be making many of these complex arrows (as you seem to be doing) you can also use path replacing to automate your arrow style:

\documentclass[tikz, border=5pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc, arrows, decorations.pathreplacing}
\tikzset{
  myarrow/.style={
    decoration={show path construction, lineto code={
      \path (\tikzinputsegmentfirst) to coordinate[pos=.2] (mid1) coordinate[pos=.75] (mid2) (\tikzinputsegmentlast);
      \draw[-stealth] (\tikzinputsegmentfirst) to (mid1);
      \draw[dashed, shorten <=3pt] (mid1) to (mid2);
      \draw[-*, shorten >=2pt] (mid2) to (\tikzinputsegmentlast);
      }},
    decorate
    },
  label1/.style={pos=.2, font=\footnotesize},
  label2/.style={pos=.9, font=\tiny}
  }

\begin{document}
\begin{tikzpicture}
\node (C) at (0,0)  [draw=red, circle, fill=gray!50]{C} ;
\node (X) at (1,4)  [draw=black, circle]{X} ;
\node (Y) at (25:4)  [draw=black, circle]{Y} ;
\draw[myarrow] (C) to node[label1, right] {0,7} node[label2, right] {0,65} (X);
\draw[myarrow] (C) to node[label1, below] {0,4} node[label2, below] {0,35} (Y);
\end{tikzpicture}
\end{document}

Answer 2

The following has a 2cm arrow, a one cm line ending in a circle in a straight line between two nodes, with the remainder drawn with dots.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepgflibrary{arrows.meta}

\begin{document}
\begin{tikzpicture}
\node (C) at (0,0)  [draw=red,circle, fill=gray!50, align=center, text width=30pt,line width=2pt,outer sep = 2pt]{C} ;
\node (X) at (3,7)  [draw=black,circle,  align=center, text width=20pt,line width=2pt,outer sep = 2pt]{X} ;
\draw [->] (C) --  ($(C)!2cm!(X)$);
\draw [dotted] ($(C)!2.1cm!(X)$) -- ($(X)!2.1cm!(C)$);
\draw [-{Circle}] ($(X)!2cm!(C)$) --  (X);
\end{tikzpicture}
\end{document}