I am definitely unfamiliar with both beamer
and tikz
(do not quite get what the \only
are supposed to do) but perhaps this could go in the direction you want:
\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{chains}
\newcounter{count}
% helper macro:
\long\def\GobToSemiColon #1;{}
\newcommand\myPicture{
\begin{tikzpicture}
\begin{scope}[start chain = going below]
\ifnum\value{count}<1 \expandafter\GobToSemiColon\fi
\ifnum\value{count}>3 \expandafter\GobToSemiColon\fi
\node[draw, rectangle, on chain] {display only when counter is between
1 and 3};
\ifnum\value{count}>-1 \expandafter\GobToSemiColon\fi
\node[draw, rectangle, on chain] {display only when counter is
negative};
\ifnum\value{count}<100 \expandafter\GobToSemiColon\fi
\ifnum\value{count}>200 \expandafter\GobToSemiColon\fi
\node[draw, rectangle, on chain] {display only if counter is between
100 and 200};
\ifnum\value{count}<3 \expandafter\GobToSemiColon\fi
\ifnum\value{count}>20 \expandafter\GobToSemiColon\fi
\node[draw, circle, on chain] {only when counter is in the range 3 to 20};
\end{scope}
\end{tikzpicture}
}
\begin{document}
\begin{frame}
\only{\setcounter{count}{-3}\myPicture}
\only{\setcounter{count}{105}\myPicture}
\only{\setcounter{count}{39}\myPicture}
\only{\setcounter{count}{2}\myPicture}
\only{\setcounter{count}{5}\myPicture}
\end{frame}
\end{document}
![beamer](https://i.stack.imgur.com/h1oev.png)
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](https://i.stack.imgur.com/OVWVC.png)
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 L
eft 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](https://i.stack.imgur.com/91jCt.png)
Best Answer
The code can be adapted very easily to not get the warning anymore:
EDIT: I think I also have an explanation: Each time
tikz
draws a line, it uses 2 bounding boxes (cf. PGF manual v 2.10 - page 579):Section 7.13 details these parameters.
What I think is happening, is that regardless of the way how the line ends (
line cap
), its bounding box protrudes by\pgflinewidth
beyond the edge of the text area by this length. This is probably necessary to accommodate the whole line in case of nicely rounded line caps. Since this requires in fact.5\pgflinewidth
on each end and the bounding box of the line starts at exactly(0,0)
the overhang will be\pgflinewidth
at the end of the line.