Horizontal grid lines

Question

I have a problem with horizontal grid lines in a graph (I am trying to overlay a 1cm x 1cm grid to my pages, and stumbled upon this in the process):

\documentclass{standalone}
\usepackage{tikz}
\begin{document}   
\tikz[]{%
    \draw [help lines,red,ystep=1cm,xstep=1cm] (0,0) node{A} grid +(3cm, -3cm) node{B};
        }   
\tikz[]{%
    \draw [help lines,blue,ystep=1cm,xstep=1cm] (0,0) node{A} grid +(3cm, 3cm) node{B};
        }  
\tikz[]{%
    \draw [help lines,green,ystep=-1cm,xstep=1cm] (0,0) node{A} grid +(3cm, -3cm) node{B};
        }
\end{document}

with this result:

Notice that the green grid has a negative ystep as suggested in Grid missing horizontal lines, but still I have no lines.

So I decided that I probably do not understand how grids are generated; can someone shed some light here?

Answer 1

Please update your TikZ version. You should not use negative steps if your vectors are not defined in negative directions. Just do like the following in order to span the grid:

% arara: pdflatex

\documentclass[tikz]{standalone}

\begin{document}
\begin{tikzpicture}
    \begin{scope} % south west to north east
        \draw [help lines,red,ystep=1cm,xstep=1cm] (0,0) node{A} grid +(3,3) node{B};
    \end{scope}
    \begin{scope} % north west to south east
        \draw [help lines,blue,ystep=1cm,xstep=1cm] (4,3) node{A} grid +(3,-3) node{B};
    \end{scope}
    \begin{scope} % north east to south west
        \draw [help lines,green,ystep=1cm,xstep=1cm] (11,3) node{A} grid +(-3,-3) node{B};
    \end{scope}
    \begin{scope} % south east to north west
        \draw [help lines,ystep=1cm,xstep=1cm] (15,0) node{A} grid +(-3,+3) node{B};
    \end{scope}
\end{tikzpicture}   
\end{document}