[Tex/LaTex] Bounding box vs. xshift

bounding boxtikz-pgf

The xshift in the following figure breaks the bounding box:

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{scopes}
\usetikzlibrary{chains}
\usetikzlibrary{backgrounds} % used only for testing with "framed"

\newcommand{\parlistrdeepseq}{
  \begin{tikzpicture}
    [start chain=going below, 
     every on chain/.append style={join},
     every join/.style={->},
     framed]

     \node[on chain] { map f (28:28:28:28:[]) };
     \node(x1)[on chain] { f 28 : (map f (28:28:28:[])) };
     % \node(y1)[below=of \tikzchainprevious.south, xshift=-3cm] {|f 28|};
     { [start chain=t1 going below]
       \node(y1)[on chain, left=of x1, yshift=-1cm] {f 28};
       \node[on chain] {514229};
       \path (x1.south west) edge[->] (y1);
     }
     \node(x2)[on chain] {  y : f 28 : (map f (28:28:[])) };
     { [start chain=t2 going below, transform canvas={xshift=1cm}]
       \node(y2)[on chain, left=of x2, yshift=-1cm] {f 28};
       \node[on chain] {514229};
       \path (x2.south west) edge[->] (y2);
     }
     \node[on chain] {  y : y : y : y []};
   \end{tikzpicture}}

\begin{document}
\parlistrdeepseq
\end{document}

The output with the wrong bounding box is:
enter image description here

Best Answer

It's not the xshift, it's the transform canvas that causes this behaviour. As it says in the pgfmanual:

when you use canvas transformations pgf loses track of positions of nodes and of picture sizes since it does not take the effect of canvas transformations into account when it computes coordinates of nodes

You should put the xshift into the options for the y2 node instead:

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{scopes}
\usetikzlibrary{chains}
\usetikzlibrary{backgrounds} % used only for testing with "framed"

\newcommand{\parlistrdeepseq}{
  \begin{tikzpicture}
    [start chain=going below, 
     every on chain/.append style={join},
     every join/.style={->},
     framed]

     \node[on chain] { map f (28:28:28:28:[]) };
     \node(x1)[on chain] { f 28 : (map f (28:28:28:[])) };
     % \node(y1)[below=of \tikzchainprevious.south, xshift=-3cm] {|f 28|};
     { [start chain=t1 going below]
       \node(y1)[on chain, left=of x1, yshift=-1cm] {f 28};
       \node[on chain] {514229};
       \path (x1.south west) edge[->] (y1);
     }
     \node(x2)[on chain] {  y : f 28 : (map f (28:28:[])) };
     { [start chain=t2 going below]
       \node(y2)[on chain, left=of x2, xshift=1cm, yshift=-1cm] {f 28};
       \node[on chain] {514229};
       \path (x2.south west) edge[->] (y2);
     }
     \node[on chain] {  y : y : y : y []};
   \end{tikzpicture}}

\begin{document}
\parlistrdeepseq
\end{document}

Related Solutions

[Tex/LaTex] TikZ: Cropping the Bounding Box

The code adds some completely useless invisible (or rather white) stuff. The lines

\clip(0pt,403pt) -- (389.957pt,403pt) -- (389.957pt,99.6166pt) -- (0pt,99.6166pt) -- (0pt,403pt);
\color[rgb]{1,1,1}
\fill(3.76406pt,399.236pt) -- (380.923pt,399.236pt) -- (380.923pt,253.19pt) -- (3.76406pt,253.19pt) -- (3.76406pt,399.236pt);
\fill(53.4497pt,394.719pt) -- (374.901pt,394.719pt) -- (374.901pt,289.325pt) -- (53.4497pt,289.325pt) -- (53.4497pt,394.719pt);

draw a white background that is larger than the actual picture. TikZ sees that and thinks it is part of the picture. Simply removing/uncommenting these lines removes most of the whitespace.

Near the end of the first scope,

\color[rgb]{1,1,1}
\fill(3.76406pt,249.426pt) -- (386.193pt,249.426pt) -- (386.193pt,103.381pt) -- (3.76406pt,103.381pt) -- (3.76406pt,249.426pt);

does the same. Additionally (near the end of the second scope),

\pgftext[center, base, at={\pgfpoint{220.95pt}{106.392pt}}]{\sffamily\fontsize{9}{0}\selectfont{\textbf{ }}}

adds a blank node below the picture, again enlarging the bounding box.

Removing all those lines gives a tight bounding box.

As far as I know, TikZ cannot do the cropping for you, as it can't know whether the white stuff is intentional or not (there might for example be a dark background behind the image so that white is visible).

[Tex/LaTex] TikZ/PGF bounding box too large

You need to set the inner sep to zero. It's the separation between the inner content and the outer frame (which is only visible if you use draw). There is also outer sep which is by default half of the drawing line width (.5\pgflinewidth) and places the anchors at the outer side of the frame lines, not it the middle. You might want to set it also to zero to get exactly the border of the image.

\begin{tikzpicture} 
\node [inner sep=0pt,outer sep=0pt] at (0,0) {\includegraphics[width=1.0\linewidth]{figure.pdf}};
\draw (current bounding box.south west) rectangle (current bounding box.north east);
\end{tikzpicture}

See also the related question Drawing on an image with TikZ.

Best Answer

Related Solutions

[Tex/LaTex] TikZ: Cropping the Bounding Box

[Tex/LaTex] TikZ/PGF bounding box too large

Related Question