How to draw random circles
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How to draw random circles
by Rouben Rostamian-3
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Here is latex file in its entirety:
%--- begin ----------------------- \documentclass{article} \usepackage{tikz} \begin{document} \begin{tikzpicture} \draw (0,0) circle (rnd); \draw (2,0) circle (rnd); \draw (4,0) circle (rnd); \end{tikzpicture} \end{document} %--- end ----------------------- The idea is to draw 3 circles with random radii. My reading of the documentation is that rnd returns a random number in the range 0 to 1. Then I don't know why instead of getting circles, the code above produces ellipses of various sizes and aspect ratios. This is with tikz from the CVS that I checked out in June. -- Rouben Rostamian ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ pgf-users mailing list pgf-users@... https://lists.sourceforge.net/lists/listinfo/pgf-users |
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Re: How to draw random circles
by Alain Matthes-2
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Le 27 sept. 2009 à 07:55, Rouben Rostamian a écrit : > \documentclass{article} > \usepackage{tikz} > \begin{document} > > \begin{tikzpicture} > \draw (0,0) circle (rnd); > \draw (2,0) circle (rnd); > \draw (4,0) circle (rnd); > \end{tikzpicture} > > \end{document} Hi Rouben, Perhaps "circle" is a shortcut for "ellipse" and the new syntax uses "x radius" and "y radius" For example \draw (1,0) circle [x radius=1cm, y radius=5mm, rotate=30]; gives an ellipse. Perhaps (???) with rnd you gives x radius=rnd, y radius=rnd A solution \documentclass{article} \usepackage{tikz} \begin{document} \begin{tikzpicture} \pgfmathparse{random()} \pgfmathsetmacro{\mynb}{\pgfmathresult} \draw (rnd,rnd) circle (\mynb); \end{tikzpicture} \end{document} Remark : \documentclass{article} \usepackage{tikz} \begin{document} \begin{tikzpicture} \tikzset{r/.style={radius=#1},rx/.style={x radius=#1},ry/.style={y radius=#1}} \draw (1,0) circle [r=rnd]; \end{tikzpicture} \end{document} gives an ellipse So you need to fix the argument but I'm not sure of my explanation !! Best Regards Hope this helps Alain Matthes ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ pgf-users mailing list pgf-users@... https://lists.sourceforge.net/lists/listinfo/pgf-users |
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Re: How to draw random circles
by Mark Wibrow-2
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Hi,
Yes, rightly or wrongly (probably wrongly), rnd is calculated once for the x radius and once for the y radius. The calc library provides another way around: \documentclass{article} \usepackage{tikz} \usetikzlibrary{calc} \begin{document} \begin{tikzpicture} \foreach \i in {1,...,5} \draw let \n1={rnd} in (rnd,rnd) circle (\n1); \end{tikzpicture} \end{document} To take advantage of the newer syntax (can't actually remember when it was introduced), you can hack into the radius key: \documentclass{article} \usepackage{tikz} \begin{document} \makeatletter \tikzset{ radius/.code={% \pgfmathparse{#1}\let\tikz@temp@value=\pgfmathresult% \tikzset{x radius=\tikz@temp@value,y radius=\tikz@temp@value}% } } \makeatother \begin{tikzpicture} \foreach \i in {1,...,5} \draw (rnd,rnd) circle [radius=rnd]; \end{tikzpicture} \end{document} regards Mark 2009/9/27 Alain Matthes <alain.matthes@...>: > > Le 27 sept. 2009 à 07:55, Rouben Rostamian a écrit : > >> \documentclass{article} >> \usepackage{tikz} >> \begin{document} >> >> \begin{tikzpicture} >> \draw (0,0) circle (rnd); >> \draw (2,0) circle (rnd); >> \draw (4,0) circle (rnd); >> \end{tikzpicture} >> >> \end{document} > > Hi Rouben, > > Perhaps "circle" is a shortcut for "ellipse" and the new syntax > uses "x radius" and "y radius" > For example > \draw (1,0) circle [x radius=1cm, y radius=5mm, rotate=30]; > gives an ellipse. > > Perhaps (???) with rnd you gives x radius=rnd, y radius=rnd > > A solution > > \documentclass{article} > \usepackage{tikz} > \begin{document} > > \begin{tikzpicture} > \pgfmathparse{random()} > \pgfmathsetmacro{\mynb}{\pgfmathresult} > \draw (rnd,rnd) circle (\mynb); > \end{tikzpicture} > \end{document} > > Remark : > > \documentclass{article} > \usepackage{tikz} > \begin{document} > > \begin{tikzpicture} > \tikzset{r/.style={radius=#1},rx/.style={x radius=#1},ry/.style={y > radius=#1}} > \draw (1,0) circle [r=rnd]; > \end{tikzpicture} > > \end{document} > > gives an ellipse > > So you need to fix the argument but I'm not sure of my explanation !! > > Best Regards > > Hope this helps > > Alain Matthes > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry® Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9-12, 2009. Register now! > http://p.sf.net/sfu/devconf > _______________________________________________ > pgf-users mailing list > pgf-users@... > https://lists.sourceforge.net/lists/listinfo/pgf-users > ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ pgf-users mailing list pgf-users@... https://lists.sourceforge.net/lists/listinfo/pgf-users |
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Re: How to draw random circles
by Alain Matthes-2
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Le 27 sept. 2009 à 14:53, Mark Wibrow a écrit : > To take advantage of the newer syntax (can't actually remember when it > was introduced), you can hack into the radius key: > > \documentclass{article} > \usepackage{tikz} > > \begin{document} > > \makeatletter > \tikzset{ > radius/.code={% > \pgfmathparse{#1}\let\tikz@temp@value=\pgfmathresult% > \tikzset{x radius=\tikz@temp@value,y radius=\tikz@temp@value}% > } > } > \makeatother Thanks for this hack. It's very interesting to know the possibility to use /.code like this. When I wrote my answer, I thought a few seconds to do something like that but We can do a lot of things with \tikzset ! Best Regards Alain Matthes ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ pgf-users mailing list pgf-users@... https://lists.sourceforge.net/lists/listinfo/pgf-users |
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Re: How to draw random circles
by Rouben Rostamian-3
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On Sun, Sep 27, 2009 at 01:53:32PM +0100, Mark Wibrow wrote:
>> \begin{tikzpicture} >> \draw (0,0) circle (rnd); >> \draw (2,0) circle (rnd); >> \draw (4,0) circle (rnd); >> \end{tikzpicture} >> >> \end{document} > > Yes, rightly or wrongly (probably wrongly), rnd is calculated once for > the x radius and once for the y radius. The calc library provides > another way around: > > \documentclass{article} > \usepackage{tikz} > \usetikzlibrary{calc} > \begin{document} > > \begin{tikzpicture} > \foreach \i in {1,...,5} > \draw let \n1={rnd} in (rnd,rnd) circle (\n1); > \end{tikzpicture} > > \end{document} Thank you Mark, and Alain, for your explanations and the workaround. Till, if you read this message, you may want to look into the unexpected behavior that started out this thread and fix it if possible. Rouben ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ pgf-users mailing list pgf-users@... https://lists.sourceforge.net/lists/listinfo/pgf-users |
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