[Tex/LaTex] How to label these dots in Tikz image

graphicstikz-pgftikz-styles

I got this drawing of the Desarguesean configuration of the net, and I want to be able to label specific dots with different letters.
I have next to no experience using tikz. Here's the code so far:

\begin{tikzpicture}
\tikzstyle{point1}=[ball color=cyan, circle, draw=black, inner sep=0.1cm]
\tikzstyle{point2}=[ball color=green, circle, draw=black, inner sep=0.1cm]
\tikzstyle{point3}=[ball color=red, circle, draw=black, inner sep=0.1cm]

\node (v1) at (0,8) [ball color=blue, circle, draw=black, inner sep=0.1cm] {};
\node (v2) at (0,6) [point1] {};
\node (v3) at (2,5.5) [point1] {};
\node (v4) at (1.5,4) [point1] {};
\node (v5) at (0,0) [point2] {};
\node (v6) at (2.75*2,8-2.75*2.5) [point2] {};
\node (v7) at (1.5*1.5,8-1.5*4) [point2] {};

\draw (v1) -- (v2) -- (v5);
\draw (v1) -- (v3) -- (v6);
\draw (v1) -- (v4) -- (v7);
\draw (v2) -- (v3) -- (v4) -- (v2);
\draw (v5) -- (v6) -- (v7) -- (v5);

\node (v8) at (intersection of v2--v3 and v5--v6) [point3] {};
\node (v9) at (intersection of v2--v4 and v5--v7) [point3] {};
\node (v10) at (intersection of v3--v4 and v6--v7) [point3] {};

\draw (v3) -- (v8) -- (v6);
\draw (v4) -- (v9) -- (v7);
\draw (v4) -- (v10) -- (v7);
\draw (v8) -- (v9) -- (v10);
\end{tikzpicture}

Best Answer

like this?

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

\begin{document}
\begin{tikzpicture}[
point/.style = {circle, draw=black, inner sep=0.1cm,
                ball color=#1,
                node contents={}},
every label/.append style = {font=\footnotesize}
                    ]
\node (v1) at (0,8)     [point=blue, label=left:v1];
\node (v2) at (0,6)     [point=cyan, label=left:v2];
\node (v3) at (2,5.5)   [point=cyan, label=above right:v3];
\node (v4) at (1.5,4)   [point=cyan, label=left:v4];
\node (v5) at (0,0)     [point=green,label=left:v5];
\node (v6) at (2.75*2,8-2.75*2.5)   [point=green, label=below:v6];
\node (v7) at (1.5*1.5,8-1.5*4)     [point=green, label=below:v7];
%
\draw   (v1) -- (v2) -- (v5)
        (v1) -- (v3) -- (v6)
        (v1) -- (v4) -- (v7)
        (v2) -- (v3) -- (v4) -- (v2)
        (v5) -- (v6) -- (v7) -- (v5);

\node (v8)  at (intersection of v2--v3 and v5--v6) [point=red];
\node (v9)  at (intersection of v2--v4 and v5--v7) [point=red];
\node (v10) at (intersection of v3--v4 and v6--v7) [point=red];

\draw   (v3) -- (v8)  -- (v6)
        (v4) -- (v9)  -- (v7)
        (v4) -- (v10) -- (v7)
        (v8) -- (v9)  -- (v10);
\end{tikzpicture}
\end{document}

or you like to have labels in nodes?

Related Solutions

[Tex/LaTex] How to label an image inside tikz

How about this:

\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}

\parindent0mm

\begin{document}

\begin{tikzpicture}
    \draw (-3,-1) rectangle (3,1) (-2,-2) rectangle (2,2);
    \node[below right] at (current bounding box.south west) {\textbf{Image 1: rectangles}};
\end{tikzpicture}

\lipsum[1]

\begin{tikzpicture}
    \draw (-3,-1) circle (1) (-2,-2) circle (2);
    \node[below right] at (current bounding box.south west) {\textbf{Image 2: circles}};
\end{tikzpicture}

\end{document}

enter image description here

Edit 1: Probably like this (the icon are taken from here):

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
    \node (cal) at (0,0) {\includegraphics[scale=4]{Calendar2.png}};
    \node (dow) at (7,0) {\includegraphics[scale=1.7]{Downloads.png}};  
    \node (fol) at (7,7) {\includegraphics[scale=1.7]{Folder.png}};
    \node (emo) at (0,7) {\includegraphics[scale=1.7]{Emoticons.png}};

    \node[below right] at (emo.south west) {\textbf{Img 1:} Emoticon};
    \node[below right] at (fol.south west) {\textbf{Img 2:} Folder};
    \node[below right] at (cal.south west) {\textbf{Img 3:} Calendar};
    \node[below right] at (dow.south west) {\textbf{Img 4:} Downloads};
\end{tikzpicture}

\end{document}

enter image description here

[Tex/LaTex] TikZ: Drawing an arc from an intersection to an intersection

A solution which allows to draw intersection segments of any two intersections is available as tikz library fillbetween.

This library works as general purpose tikz library, but it is shipped with pgfplots and you need to load pgfplots in order to make it work:

\documentclass{standalone}

\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{fillbetween}

\begin{document}

\begin{tikzpicture}

\draw [name path=red,red] (120:1.06) circle (1.9);
%\draw [name path=yellow,yellow] (0:1.06) circle (2.12);
\draw [name path=green,green!50!black] (0:0.77) circle (2.41);
\draw [name path=blue,blue] (0:0) circle (1.06);

% substitute this temp path by `\path` to make it invisible:
\draw[name path=temp1, intersection segments={of=red and blue,sequence=L1}];
\draw[red,-stealth,ultra thick, intersection segments={of=temp1 and green,sequence=L3}];

\end{tikzpicture}

\end{document}

enter image description here

The key intersection segments is described in all detail in the pgfplots reference manual section "5.6.6 Intersection Segment Recombination"; the key idea in this case is to

create a temporary path temp1 which is the first intersection segment of red and blue, more precisely, it is the first intersection segment in the Left argument in red and blue : red. This path is drawn as thin black path. Substitute its \draw statement by \path to make it invisible.
Compute the desired intersection segment by intersecting temp1 and green and use the correct intersection segment. By trial and error I figured that it is the third segment of path temp1 which is written as L3 (L = left argument in temp1 and green and 3 means third segment of that path).

The argument involves some trial and error because fillbetween is unaware of the fact that end and startpoint are connected -- and we as end users do not see start and end point.

Note that you can connect these path segments with other paths. If such an intersection segment should be the continuation of another path, use -- as before the first argument in sequence. This allows to fill paths segments:

\documentclass{standalone}

\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{fillbetween}

\begin{document}

\begin{tikzpicture}

\draw [name path=red,red] (120:1.06) circle (1.9);
%\draw [name path=yellow,yellow] (0:1.06) circle (2.12);
\draw [name path=green,green!50!black] (0:0.77) circle (2.41);
\draw [name path=blue,blue] (0:0) circle (1.06);

% substitute this temp path by `\path` to make it invisible:
\draw[name path=temp1, intersection segments={of=red and blue,sequence=L1}];
\draw[red,fill=blue,-stealth,ultra thick, intersection segments={of=temp1 and green,sequence=L3}]  
    [intersection segments={of=temp1 and green, sequence={--R2}}]
;

\end{tikzpicture}

\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] How to label an image inside tikz

[Tex/LaTex] TikZ: Drawing an arc from an intersection to an intersection

Related Question