I'm creating a beamertemplate (for beamerposter, actually) and I want to increase the radius of a block. According to the beamer manual (12.3) I can pass the [rounded] option to a block or the beamertemplate blocks in order to make the borders round. But the rounded corners look really small, so I'd like to play around with the radius of the circle that specifies the round corner. How can I do that?
[Tex/LaTex] manipulate the rounded-ness of blocks
beamerrounded-corners
Related Solutions
I stumbled in a similar problem and solved it with the tcolorbox package.
Here is the code:
\documentclass[final]{beamer}
\usepackage[orientation=portrait,size=a0,scale=1.4,debug]{beamerposter}
\usepackage{tcolorbox} %
\tcbuselibrary{skins} % preamble
\usepackage{tikz} %
\usetikzlibrary{shadows,shadings} %
\tikzset{myshadow/.style={ % custom shadow with tikz
opacity=.85,
shadow xshift=0.15,
shadow yshift=-0.15,
shade,
shading=axis,
shading angle=230}
}
\tcbset{ % set a custom tcolorbox
skin=enhanced, % enables use of shadows
frame style={fill=gray,drop shadow={myshadow}}, % sets the frame color and the shadow properties
bottom=7mm, % distance between the body text and the bottom frame
top=14mm, % distance between the body text and the top frame
boxrule=0mm, % frame width
bottomtitle=5mm, % distance between the title text and the bottom title frame
toptitle=5mm, % distance between the title text and the top title frame
lefttitle=1cm % title text left margin
}
\begin{document}
\begin{frame}
\begin{columns}
\begin{column}{.3\textwidth}
\begin{tcolorbox}[title=\large Fontsizes]
\centering
{\tiny tiny}\par
{\scriptsize scriptsize}\par
{\footnotesize footnotesize}\par
{\normalsize normalsize}\par
\end{tcolorbox}
\end{column}
\end{columns}
\end{frame}
\end{document}
the result is this:
for comparison:
I tried to explain everything in the code. If you want all the tcolorboxes to be like this, just put the \tcbset code in the preamble, otherwise start a group just before the tcolorboxes you want to customize in that way.
The only thing that doesn't really look the same is the shadow (my shadow isn't blurred), but with some tweaks and the shadows.blur tikzlibrary it should be possible to obtain the exact same result.
(Unfortunately \usecolortheme{structure} does not work for me, so I could only try the rest)
\documentclass{beamer}
\usetheme{Madrid}
\useinnertheme{rectangles}
\usefonttheme{professionalfonts}
%\usecolortheme{structure}
\usepackage{times}
\setbeamertemplate{blocks}[default]
\begin{document}
\begin{frame}
\begin{block}{Block 1: Guguck}
Hallo du da, im Radio!
\end{block}
\begin{columns}[t, totalwidth=1.02\textwidth]
\begin{column}{0.45\linewidth}
\begin{block}{Block 2a: Guguck und eine laengere Ueberschrift}
\begin{itemize}
\item a
\item b
\item c
\end{itemize}
\end{block}
\end{column}
\begin{column}{0.45\linewidth}
\begin{block}{Block 2b: Guguck}
Hallo du da, im Radio!
\end{block}
\end{column}
\end{columns}
\end{frame}
\end{document}
Best Answer
The document class
beamerinternally uses\pgfpathqmoveto,\pgfpathqcurvetoand\pgfpathlinetoto build the rounded boxes, so you can play with the values used in the original definition (it can be found in the filebeamerbaseboxes.sty).In the code below I show a variation in which I changed the values for the rounded corners for the upper part of the blocks (these changes have to be made in the definition of
\beamerboxesrounded, which builds the upper part of the blocks); the original definitions appear commented out and marked with% originalat the end of the lines; the modified lines appear right afterwards and are marked with% NEW.To change the rounded corners for the bottom of the blocks you will have to make similar changes in some lines of
\endbeamerboxesrounded(which builds the lower part of the blocks); the lines in which changes will have to be made are marked with% original:change.