[Tex/LaTex] Annotating picture with tikz and positioning

tikz-pgf

I am annotating a picture with tikz.

I have tried

\documentclass[tikz]{standalone}

\usetikzlibrary{shapes,arrows,positioning,decorations.pathreplacing}

\begin{document}

\tikzset{%
    box/.style = {red, thick, rounded corners},
    arrow/.style = {->, green, ultra thick},
}

\begin{tikzpicture}[node distance=0.1cm, auto]
    % image
    \node[anchor=south west,inner sep=0] (image) at (0,0) {%
        \includegraphics[width=0.9\textwidth]{img/navbar.PNG}
    };

    % annotate
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        \draw[box] (0.02,0.15) rectangle (0.1,0.9);
        \node at (-0.02,-1) {Home};
        \draw[arrow] (0,-0.8) -- (0.02,0.15);
    \end{scope}
\end{tikzpicture}

\end{document}

My code works but I have manually placed my node with text "Home". I have to draw multiple boxes with text to each box. I also want an arrow from the text to the box to which the text belongs.

Can I use some positioning magic? I have tried naming the drawn rectangle with \draw[box] (home) (0.02,0.15) rectangle (0.1,0.9); but it's apparently not allowed to name rectangles like I can name nodes.

Best Answer

You can add a coordinate at one corner of the rectangle, draw a line with the end point relative to this with the ++(x,y) syntax, and add the Home node at the end of the line. Adjust the value for shorten < to your liking.

enter image description here

\documentclass[tikz,border=3mm]{standalone}

\usetikzlibrary{shapes,arrows,positioning,decorations.pathreplacing}

\begin{document}

\tikzset{%
    box/.style = {red, thick, rounded corners},
    arrow/.style = {->, green, ultra thick},
}

\begin{tikzpicture}[node distance=0.1cm, auto]
    % image
    \node[anchor=south west,inner sep=0] (image) at (0,0) {%
        \includegraphics[width=0.9\textwidth]{example-image}
    };

    % annotate
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        \draw[box] (0.02,0.15) coordinate(box1) rectangle (0.1,0.9);
        \draw [arrow,shorten <=1pt] (box1) -- ++(-0.1,-0.7) node[below,black]{Home};
    \end{scope}
\end{tikzpicture}

\end{document}

Related Solutions

[Tex/LaTex] How to avoid superfluous space in the initial state of a tikz automaton

It's because when you clear the text of the initial node you don't actually decrease the node size. I've added a draw to the node options to make it obvious that your guess is correct:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{automata}
\tikzset{initial text={}}
\makeatletter
\tikzstyle{initial by arrow}=   [after node path=
{
  {
    [to path=
    {
      [->,double=none,every initial by arrow]
      ([shift=(\tikz@initial@angle:\tikz@initial@distance)]\tikztostart.\tikz@initial@angle)
          node [shape=rectangle,anchor=\tikz@initial@anchor,draw] {\tikz@initial@text}
        -- (\tikztostart)}]
    edge ()
  }
}]
\makeatother

\begin{document}

\begin{tikzpicture}
    \node[state, initial] {};
    \draw[red, dashed] (current bounding box.south west) rectangle (current bounding box.north east);
\end{tikzpicture}

\end{document}

enter image description here

Instead of draw you can put an inner sep=0 which is a good approximation, or delete the node or add overlay to keep the node but not include it in the bounding box.

[Tex/LaTex] How to define the default vertical distance between nodes

I don't really get the question so I hope this is what you wanted. If you include a full document (such that we copy paste and see the problem on our systems) things are much more easier.

Here, you can change the default setting within a scope but your block style had a node distance which was resetting every time it is issued. I've made it 2mm such that we can see the difference easier.

\documentclass[tikz]{standalone}
\usetikzlibrary{arrows,shapes.geometric,positioning}

\begin{document}
\begin{tikzpicture}[decision/.style={diamond, draw, text width=4.5em, text badly centered, node distance=3.5cm, inner sep=0pt},
                    block/.style   ={rectangle, draw, text width=6em, text centered, rounded corners, minimum height=4em, minimum height=2em},
                    cloud/.style   ={draw, ellipse, minimum height=2em},
                    line/.style    ={draw,-latex'},
                    node distance = 1cm, 
                    auto]
    \node [block] (1st) {1st};
    \node [block, right= of 1st]  (2nd1) {2nd1};
\begin{scope}[node distance=2mm and 10mm]%Here we change it for everything inside this scope
    \node [block, above= of 2nd1] (2nd2) {2nd2};
    \node [block, below= of 2nd1] (2nd3) {2nd3};
    \node [block, right= of 2nd1] (3rd1) {3rd1};
    \node [block, above= of 3rd1] (3rd2) {3rd2};
    \node [block, above= of 3rd2] (3rd3) {3rd3};
\end{scope}
    \node [block, below= of 3rd1] (3rd4) {3rd4};
    \node [block, below= of 3rd4] (3rd5) {3rd5};

    \path [line] (1st) -- (2nd1);
    \path [line] (2nd1) -- (2nd2);
    \path [line] (2nd1) -- (2nd3);
    \path [line] (2nd2) -- (3rd3);
    \path [line] (2nd1) -- (3rd1);
    \path [line] (1st) -- (2nd1);
\end{tikzpicture}
\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] How to avoid superfluous space in the initial state of a tikz automaton

[Tex/LaTex] How to define the default vertical distance between nodes

Related Question