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When using \textbf{text}, the length of text will be increased. Is there a way to make the text bold face without increasing its length?
edit:
Thanks to @Herbert and @Martin, here is a perfect solution for me:
\newsavebox\CBox
\newcommand<>*\textBF[1]{\sbox\CBox{#1}\resizebox{\wd\CBox}{\ht\CBox}{\textbf#2{#1}}}
\documentclass{article}
\usepackage{graphicx}
\newsavebox\CBox
\def\textBF#1{\sbox\CBox{#1}\resizebox{\wd\CBox}{\ht\CBox}{\textbf{#1}}}
\parindent=0pt
\begin{document}
foobarbaz y\\
\textbf{foobarbaz} y\\
\textBF{foobarbaz} y
\end{document}
The example for beamer
\documentclass{beamer}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\newsavebox\CBox
\newcommand<>*\textBF[1]{\only#2{\sbox\CBox{#1}\resizebox{\wd\CBox}{\ht\CBox}{\textbf{#1}}}}
\parindent=0pt
\begin{document}
\begin{frame}{foo}
\only<1>{foobarbaz y1}
\textbf<2->{foobarbaz y2}
\textBF<3>{foobarbaz y3}
\end{frame}
\end{document}
Another (better) possibility is to use the letter spacing option from the package microtype
beamer overlays? --e.g.\textBF<1>{text}
\only<1>{\textBF{text}} or put this definition into \def\textBFitself.
\newcommand<>\textBF[1]{\only#2{\sbox\CBox...}}, where the dots mean all the rest in Herbert's definition.
\only here will lead to a different effect in my situation --- i.e. the text will disappear in other slides.
\only<1-> so that it appears from slide 1 up to the end. Right?
You can use \fontseries{b}\selectfont to select a non-extended bold font, provided of course that the font family you're using contains such a font (as computer modern does). For comparison, note that \textbf uses \fontseries{bx}, where the xstands for “extended”.
This answer is just for adding overlay support to Herber's command, who should credited for it.
\newcommand<>\textBF[1]{\only#2{\dotextBF}{#1}}
\newcommand\dotextBF[1]{\sbox0{#1}\resizebox{\wd0}{\ht0}{\textbf{#1}}}
...
\textBF<2->{xyz}
"xyz" will be bold from the second screen onwards.
I don't think it's a good way to emphasize things on screen; colors are better.
You could use the following macro instead. It uses the size of the horizontal and vertical size of the normal text, but sets it as bold text which makes the bold text lap over the text which follows. The text is also not breakable any longer. For overlays of table cells this should be fine but I wouldn't use it in running text of course.
\newcommand*{\textBF}[1]{\rlap{\raisebox{0pt}[0pt][0pt]{\textbf{#1}}}\phantom{#1}}
If you want to support beamer overlays use:
\newcommand<>*{\textBF}[1]{\only#2{\rlap{\raisebox{0pt}[0pt][0pt]{\textbf{#1}}}\phantom}{#1}}
or
\newcommand<>*{\textBF}[1]{\alt#2{\rlap{\raisebox{0pt}[0pt][0pt]{\textbf{#1}}}\phantom{#1}}{\mbox{#1}}}
\textBF<1>{text}?
\newcommand*{\textBF}[2]{\rlap{\raisebox{0pt}[0pt][0pt]{\textbf<#1>{#2}}}\phantom{#2}} But it seems that it does not work.
text of the \textBF{text} is at the end, the length of the cell is still affected. BTW, it seems that I couldn't mention your name...
If you're willing to (or allowed to) switch to typewriter (monospaced) font, you won't encounter the problem: the regular and bold fonts have glyphs of the exact same widths.
The following MWE uses Courier (scaled 5% in order to equate the cap-heights of the mono and text fonts in use), because in that font the difference between medium weight and bold is particularly strong. The lmodern package has a bold mono font as well, but the difference to the medium weight isn't as pronounced.
\documentclass{article}
\usepackage[scaled=1.05]{couriers} %%
\begin{document}
\noindent
\texttt{The quick brown fox 012456789}\\
\texttt{\bfseries The quick brown fox 012456789}
\end{document}
Another font package possibility you may want to consider is arev. (Given that you seem to be preparing for a beamer presentation, using the arev package would be a good choice anyway.) In the arev package, the mono font harmonizes well with the text font (which is a sans-serif font), and the medium and bold mono fonts are quite different.
