[Tex/LaTex] mdframed with tikz-framework: roundcorner-keyword seem not to work completely

beamermdframedtikz-pgf

I got a similar problem to How to draw frame with rounded corners around box

I try to make round boxex for a poster presentation, I could nearly succeed using mdframed-package with tikz-option. But the innerline is almost not rounded and I can't see the reason why. Some small example-code:

\documentclass{beamer}
\usepackage[orientation=portrait,size=a0,scale=1.4,debug]{beamerposter}

\usepackage[absolute,overlay]{textpos}
\usepackage[framemethod=tikz]{mdframed}

\tikzset{contour/.style = {rounded corners = 2ex}}

\definecolor{posterbackground}{RGB}{255,245,225}    %beige
%\definecolor{blockborder}{RGB}{0,128,0}    %green
%\definecolor{blockborder}{RGB}{0,0,0}      %black
\definecolor{blockborder}{RGB}{235,235,235} %light grey

\mdfdefinestyle{frameborderstyle}%
{innerlinewidth=0.1em, innerlinecolor=black, middlelinewidth=1.0em, middlelinecolor=blockborder, outerlinewidth=0.1em, outerlinecolor=black, frametitlerule=false, innertopmargin=\topskip, backgroundcolor=posterbackground, roundcorner=0.5em}
%{outerlinecolor=blockborder, outerlinewidth=10pt, innerlinewidth=5pt, backgroundcolor=posterbackground, roundcorner=50pt}
\newenvironment{textframe}[4][]%
{\colorlet{currentcolor}{.} \fboxrule0.2em\fboxsep1.0em \begin{textblock*}{#2}(#3,#4) \begin{mdframed}[style=frameborderstyle, frametitle=#1]}
{\end{mdframed} \end{textblock*} \vspace{2.0ex}}

\begin{document}
 \begin{frame}{blabla}
 \begin{textframe}{1500pt}{50pt}{670pt}
  this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame this is written in a textpos-frame
 \end{textframe}
 \end{frame}
\end{document}

inner corners stay edged even after using of roundcorner-keyword

What am I doing wrong?

Best Answer

You have to understand the calculation of the arc by TikZ. This is important because mdframed has no extra modification for the inner arc. Of course I can implement it.

Let's take the following mwe:

\documentclass{article}

\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
 \draw[line width=2ex,rounded corners = 1ex] (0,0) rectangle (7,4);
\end{tikzpicture}
\end{document}

The line width is 2ex and the arc is 1ex. The result is:

As you can see the inner arc isn't there. If you you increase rounded corners greater than 2ex you will get:

\documentclass{article}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
 \draw[line width=2ex,rounded corners = 3ex] (0,0) rectangle (7,4);
\end{tikzpicture}
\end{document}

Related to your example: Your are using innerlinewidth=0.1em, middlelinewidth=1.0em and outerlinewidth=0.1em which leads to the width 1.2em. On the other hand you are specifying roundcorner=0.5em. As explained 0.5em is too small.

So you can either use a greater dimension for roundcorner or you redefine some internal commands to specify an inner arc.

Related Solutions

[Tex/LaTex] TikZ: Cropping the Bounding Box

The code adds some completely useless invisible (or rather white) stuff. The lines

\clip(0pt,403pt) -- (389.957pt,403pt) -- (389.957pt,99.6166pt) -- (0pt,99.6166pt) -- (0pt,403pt);
\color[rgb]{1,1,1}
\fill(3.76406pt,399.236pt) -- (380.923pt,399.236pt) -- (380.923pt,253.19pt) -- (3.76406pt,253.19pt) -- (3.76406pt,399.236pt);
\fill(53.4497pt,394.719pt) -- (374.901pt,394.719pt) -- (374.901pt,289.325pt) -- (53.4497pt,289.325pt) -- (53.4497pt,394.719pt);

draw a white background that is larger than the actual picture. TikZ sees that and thinks it is part of the picture. Simply removing/uncommenting these lines removes most of the whitespace.

Near the end of the first scope,

\color[rgb]{1,1,1}
\fill(3.76406pt,249.426pt) -- (386.193pt,249.426pt) -- (386.193pt,103.381pt) -- (3.76406pt,103.381pt) -- (3.76406pt,249.426pt);

does the same. Additionally (near the end of the second scope),

\pgftext[center, base, at={\pgfpoint{220.95pt}{106.392pt}}]{\sffamily\fontsize{9}{0}\selectfont{\textbf{ }}}

adds a blank node below the picture, again enlarging the bounding box.

Removing all those lines gives a tight bounding box.

As far as I know, TikZ cannot do the cropping for you, as it can't know whether the white stuff is intentional or not (there might for example be a dark background behind the image so that white is visible).

[Tex/LaTex] Access mdframed node coordinates with TikZ

Update: To let mdframed know the right dimensions of the frame to calculate the page breaks we must give them as invisible margins (middleline) and adjust everything according to these. See the updated code below.

Marco’s comment lead me to the relevant parts in the manual. Here is my code

\documentclass{scrartcl}

\usepackage{tikz}
   \usetikzlibrary{calc,arrows}
\usepackage{etoolbox}
\usepackage[framemethod=tikz]{mdframed}

\tikzstyle{excursus arrow}=[%
   line width=4pt,
   draw=blue,
   rounded corners=2ex
]
\tikzstyle{excursus head}=[%
   fill=white,
   font={\bfseries\sffamily},
   text=blue,
   anchor=base,
]

\makeatletter
\newcommand{\drawexcursusarrow}{%
   \patchcmd{\mdf@putbox@single}{\mdfcreateextratikz}{
      \path let \p1=(P), \p2=(O) in (\x2,\y1) coordinate (Q);
      \path let \p1=(Q), \p2=(O) in (\x1,{(\y1-\y2)/2}) coordinate (M);
      \path [excursus arrow, round cap->]
         ($(O)+(5em,0ex)$) -| (M) |- %
         ($(Q)+(6em,0ex)$) .. controls +(0:16em) and +(185:6em) .. %
         ++(23em,2ex);
      \node [excursus head] at ($(Q)+(4.5em,-2pt)$) {Excursus};
   }{}{}%
   \patchcmd{\mdf@putbox@first}{\mdfcreateextratikz}{
      \path let \p1=(P), \p2=(O) in (\x2,\y1) coordinate (Q);
      \path [excursus arrow,->]
         (O) |- %
         ($(Q)+(6em,0ex)$) .. controls +(0:16em) and +(185:6em) .. %
         ++(23em,2ex);
      \node [excursus head] at ($(Q)+(4.5em,-2pt)$) {Excursus};
   }{}{}%
   \patchcmd{\mdf@putbox@second}{\mdfcreateextratikz}{
      \path let \p1=(P), \p2=(O) in (\x2,\y1) coordinate (Q);
      \path [excursus arrow,round cap-]
         ($(O)+(5em,0ex)$) -| (Q);
   }{}{}%
   \patchcmd{\mdf@putbox@middle}{\mdfcreateextratikz}{
      \path let \p1=(P), \p2=(O) in (\x2,\y1) coordinate (Q);
      \path [excursus arrow]
         (O) -- (Q);
   }{}{}%
}
\makeatother
\newmdenv[%
   middlelinewidth=24pt,
   middlelinecolor=green,
   rightline=false,
   innertopmargin=0ex,
   innerbottommargin=0ex,
   innerrightmargin=2pt,
   innerleftmargin=0ex,
   leftmargin=-11pt,
   skipabove=12pt,
   skipbelow=-1pt,%=12-24/2-2/2
   settings=\drawexcursusarrow,
]{excursus}

\usepackage{lipsum}

\begin{document}
\lipsum[3]
\begin{excursus}
   \lipsum[1]
\end{excursus}
\lipsum[3]
\end{document}

I used \pathcmd to differentiate between the broken and unbroken frames. Furthermore I draw the arrow with \drawexcursusarrow and apply this via the settings key only to the {excursus} environment, so my changes don’t effect the other frames.

Bonus question

is it possible to let mdframed ignore the descenders of the last line in the frame? Otherwise the (optical) innerbottomsep depends on these.

Best Answer

Related Solutions

[Tex/LaTex] TikZ: Cropping the Bounding Box

[Tex/LaTex] Access mdframed node coordinates with TikZ

Bonus question

Related Question