The problem occurs that the the background is drawn without any rounded corners if you set the option topline=true. However you can hack the test:
\makeatletter
\let\mdf@putbox@single@orig\mdf@putbox@single
\mdfapptodefinestyle{definition}{%
settings={%
\def\mdf@putbox@single{%
\let\mdf@test@t\@gobbletwo
\let\mdf@test@noline\@firstoftwo
\mdf@putbox@single@orig
}%
}%
}
\makeatother
After the hack you must expand the option singlextra by the following line:
\path[draw=white,line width=1.7em,overlay] (O|-P) -- (P);
to draw a white background of your title.
The odd corner of the second page a can't reproduce.
Here the output:
Here the complete code:
\documentclass{scrartcl}
\usepackage{times}
\usepackage{lipsum}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage{tikz}
\usetikzlibrary{calc,arrows,shadows}
\usepackage[framemethod=tikz]{mdframed}
\tikzset{
title/.style={
fill=white,
font=\normalfont,
text=black,
anchor=base west,
},
contour/.style = {
line width = 0.6pt,
draw = black,
rounded corners = 2ex,
},
fakeshadow/.style = {
line width = 4.5pt,
draw = white,
},
}
\newcommand{\definitiontitle}{
{\scshape \bfseries \Large Definition}
}
\mdfdefinestyle{definition}{%
singleextra={%
%% Store (O) in \p1, store (P) in \p2. Now \p1=(\x1,\y1) and \p2=(\x2,\y2). From that, define (Q) = (\x1,\y2).
\path let \p1=(O), \p2=(P) in (\x1,\y2) coordinate (Q);
\path let \p1=(O), \p2=(P) in (\x2,\y1) coordinate (R);
\path let \p1=(O), \p2=(Q) in (\x1,{(\y1+\y2)/2}) coordinate (M);
\path[draw=white,line width=1.7em,overlay] (O|-P) -- (P);
\path[contour,] (M) |- (P) |- (O) -- (M);
\node[title, anchor=west, xshift=18pt - 5pt] at (Q) {\definitiontitle};
},
firstextra={%
\path let \p1=(O), \p2=(P) in (\x1,\y2) coordinate (Q);
\path let \p1=(O), \p2=(P) in (\x2,\y1) coordinate (R);
\path[contour] (O) -- (Q) -- (P) -- (R);
\node[title, anchor=west, xshift=18pt - 5pt] at (Q) {\definitiontitle};
\path[fakeshadow] ($(O)+(1pt,-1.5pt)$) -- ($(R)+(-1pt,-1.5pt)$); %% Hide the bottom shadow
},
secondextra={%
\path let \p1=(O), \p2=(P) in (\x1,\y2) coordinate (Q);
\path let \p1=(O), \p2=(P) in (\x2,\y1) coordinate (R);
\path[contour] (Q) -- (O) -- (R) -- (P);
},
middleextra={%
\path let \p1=(O), \p2=(P) in (\x1,\y2) coordinate (Q);
\path let \p1=(O), \p2=(P) in (\x2,\y1) coordinate (R);
\path[contour] (O) -- (Q);
\path[contour] (P) -- (R);
\path[fakeshadow] ($(O)+(1pt,-1.5pt)$) -- ($(R)+(-1pt,-1.5pt)$); %% Hide the bottom shadow
},
align=center,
backgroundcolor=yellow,
userdefinedwidth=.9\textwidth,
middlelinewidth=1.7em,middlelinecolor=white,
hidealllines=true,topline=true,
innertopmargin=6pt,
innerbottommargin=18pt,
innerleftmargin=18pt,
innerrightmargin=18pt,
splitbottomskip=8pt,
splittopskip=16pt,
roundcorner=2ex,
% shadow=true,
shadowsize=5,
shadowcolor=black!40,
%% Experimental
needspace=3em,
ignorelastdescenders=true,
}
\makeatletter
\let\mdf@putbox@single@orig\mdf@putbox@single
\mdfapptodefinestyle{definition}{%
settings={%
\def\mdf@putbox@single{%
\let\mdf@test@t\@gobbletwo
\let\mdf@test@noline\@firstoftwo
\mdf@putbox@single@orig
}%
}%
}
\makeatother
\begin{document}
\lipsum[3]
\vspace{1\baselineskip}
\begin{mdframed}[style=definition]
\lipsum[1]
\end{mdframed}
\vspace{1\baselineskip}
\lipsum[3]
\vspace{1\baselineskip}
\begin{mdframed}[style=definition]
\lipsum[1-2]
\end{mdframed}
\vspace{1\baselineskip}
\lipsum[3]
\vspace{1\baselineskip}
\begin{mdframed}[style=definition]
\lipsum[1-8]
\end{mdframed}
\end{document}
I don't really get the question so I hope this is what you wanted. If you include a full document (such that we copy paste and see the problem on our systems) things are much more easier.
Here, you can change the default setting within a scope but your block style had a node distance which was resetting every time it is issued. I've made it 2mm such that we can see the difference easier.
\documentclass[tikz]{standalone}
\usetikzlibrary{arrows,shapes.geometric,positioning}
\begin{document}
\begin{tikzpicture}[decision/.style={diamond, draw, text width=4.5em, text badly centered, node distance=3.5cm, inner sep=0pt},
block/.style ={rectangle, draw, text width=6em, text centered, rounded corners, minimum height=4em, minimum height=2em},
cloud/.style ={draw, ellipse, minimum height=2em},
line/.style ={draw,-latex'},
node distance = 1cm,
auto]
\node [block] (1st) {1st};
\node [block, right= of 1st] (2nd1) {2nd1};
\begin{scope}[node distance=2mm and 10mm]%Here we change it for everything inside this scope
\node [block, above= of 2nd1] (2nd2) {2nd2};
\node [block, below= of 2nd1] (2nd3) {2nd3};
\node [block, right= of 2nd1] (3rd1) {3rd1};
\node [block, above= of 3rd1] (3rd2) {3rd2};
\node [block, above= of 3rd2] (3rd3) {3rd3};
\end{scope}
\node [block, below= of 3rd1] (3rd4) {3rd4};
\node [block, below= of 3rd4] (3rd5) {3rd5};
\path [line] (1st) -- (2nd1);
\path [line] (2nd1) -- (2nd2);
\path [line] (2nd1) -- (2nd3);
\path [line] (2nd2) -- (3rd3);
\path [line] (2nd1) -- (3rd1);
\path [line] (1st) -- (2nd1);
\end{tikzpicture}
\end{document}
Best Answer
Well, you can always save the default unit in a macro and write
rounded corners=<number>\macroname. Or you could use a wrapper style definition which automates this. For example: