problem with making simple lines

Question

I tried to make two lines:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw (1,1) -- (2,1);
\draw (1,1) -- (1,2);
\end{tikzpicture}
\end{document}

To my surprice, only lines are drawn that are at an angle of about 45 degrees. I tried many other things, but I cannot find the clue to solve this. Can somebody help me ? (the first time using TikZ).

Extra info: Now I found out that the problem only occurs if the output profile is LATEX --> DVI. If the output Profile is LATEX --> PDF, then there is no problem (the pdf-output are the two orthogonal lines as expected). Thus the question now becomes: Why are the lines I see in the DVI-output not the same as in the PDF-output?

Answer 1

I have inserted a grid. Maybe it could help you solve your problem? Let me know if I have helped you.

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[domain=-5:5, scale=0.65, baseline=0, >=stealth]
\draw (0,0)--(5,0);
\foreach \x in {0,...,5}
\draw (\x,0)--(\x,-.1) node[anchor=north] {\x};
\draw (0,0)--(0,5);
\foreach \y in {0,...,5}
\draw (0,\y)--(-.1,\y) node[anchor=east] {\y};
\draw[step=1cm, draw=lightgray, thin] (-5,-5) grid (5,5);
\draw (1,1) -- (2,1);
\draw (1,1) -- (1,2);
\end{tikzpicture}
\end{document}

Answer 2

Nobody cannot reproduce your issue. I think it is related to applying different scaling factors on horizontal and vertical directions.

\documentclass[border=12pt]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw[ultra thin,green] (0,-1) grid (3,3);
\draw (1,1) -- (2,2);
\draw (1,1) -- (2,0);
\end{tikzpicture}
\begin{tikzpicture}[xscale=.25]
\draw[ultra thin,green] (0,-1) grid (3,3);
\draw (1,1) -- (2,2);
\draw (1,1) -- (2,0);
\end{tikzpicture}
\end{document}