# Smooth connection between tikz lines in foreach loop

I am trying to draw a diagram of a square wave. To do this easily I used a foreach loop to recreate a part several times. However, the flat line before and after the square wave pulse does not connect with a smooth transition, as shown on the left in the figure.

What I try to accomplish is the smooth connection as one would get when not using the foreach loop.

The code:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[line join=round, x=1pt, y=1pt, thick]
\draw (0,0) -- (30,0);
\foreach \x in {2,...,9}{
\draw[yscale=2] (\x*15,0) -- (\x*15,50) -- (\x*15+7.5,50)
-- (\x*15+7.5,-50) -- (\x*15+15,-50) -- (\x*15+15, 0);
}
\draw (150,0) -- (200,0);
\end{tikzpicture}
\end{document}


What is a proper way to get the result on the right in the figure above?

-

You can make it all in one path so that path is not broken.

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[line join=round, x=1pt, y=1pt, thick]
\draw (0,0) -- (30,0);
\draw[yscale=2] foreach \x in {2,...,9}{
(\x*15,0) -- (\x*15,50) -- (\x*15+7.5,50)
-- (\x*15+7.5,-50) -- (\x*15+15,-50) -- (\x*15+15, 0)
}
-- (200,0);
\end{tikzpicture}
\end{document}

-
oops I forgot the first part of the path but it's the same idea. – percusse Feb 28 at 11:49
Thanks, that was much more simple than I expected. I had tried this, but ending with --, and then starting with (..,..) on the new line, but that of course didn't work... – Douwe66 Feb 28 at 11:53