Überarbeitungsverlauf[Zurück]
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Update auf PGF-Ebene
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Fangen wir mal mit was an.
Der Code definiert ein Shape mit dem Namen `rectangle with rounded corners`. Dazu nötig sind außerdem die Keys
- `rectangle with rounded corners mode` sowie
- `rectangle with rounded corners radius`.
Beim Modus werden unterschieden:
- `none`: keine Abrundung erfolgt.
- `inside`: eine klassische Abrundung wie mit der Option `rounded corners` erfolgt.
- `outside`: wie `inside` nur mit negativem Radius (ob das ein Feature von TikZ is, ist mir nicht bekannt, es kann also sein, dass das irgendwann nicht mehr geht).
- `vertical`: es entsteht ein Zipfel in vertikaler Richtung.
- `horizontal`: es entsteht ein Zipfel in horizontaler Richtung
Werden weniger als vier Einträge angegeben wird der letzte für alle folgende wiederholt. Der erste Eintrag gilt für die Nordost-Ecke, die anderen Ecken folgen gegen den Uhrzeigersinn (mathematisch positiv wie sonst auch in TikZ/PGF). Es kann auch nur der erste Buchstabe (`n`, `i`, `o`, `v`, `h`) angegeben werden, wobei alles andere als `n`, `i` `i`, `o`, `h` oder `v` als `h` `n` behandelt wird.
Der `radius`-Key funktioniert im Prinzip genauso. Er wird ignoriert, falls die Ecke im Modus `none` gezeichnet werden soll. Ein negativer Radius führt beim Der `outside`-Modus funktioniert wie der `inside`-Modus zu einem interessanten Effekt (der allerdings nur mit negativem Radius. Achtung: Das aktualisiert nicht die Bounding Box (wie das Beispiel unten auch mit der `rounded zeigt, da das Low-Level `\pgfsetcornersarced` verwendet wird (`rounded corners` entsteht). Ein negativer Radius im vertikalen Modus führt zu einer horizontalen Ecke und umgekehrt. Im Nachhinein hätte das Ganze etwas effektiver programmiert werden können:
in TikZ)).
- PGF-`rounded corners`-Option im `inside`-Modus verwenden (vermutlich im Low-Level effektiver).
- Der Fakt, dass der vertikale Modus und der horizontale Modus nur anhand des Radiusvorzeichen unterscheidbar ist, hätte das Ganze kürzer machen können.
Eventuell werde ich die obige Punkte noch updaten.
Ebenso fehlt Es fehlen dem Shape noch jegliche Anchors, die mit den abgerundeten Ecken zu tun haben, man kann also keine Koordinaten an den Enden der Bögen auswählen (das ist relativ einfach nachzuarbeiten). Genauso funktionieren die angulären Anchors nicht (die sogenannte Anchor-Border), das ist auch nicht so einfach nachzuarbeiten, da wie es mit Viertelkreisen zu tun haben. Vermutlich müsste man die `intersections`-Library dazu verwenden.
Achtung, es erfolgt keine Kontrolle auf Sinnhaftigkeit der Radien, sie sollten kleiner gewählt werden als die Hälfte der Breite und die Hälfte der Höhe der Node!
des Nodes!
## Code
\documentclass[tikz,convert=false]{standalone}
\makeatletter
\pgfset{
rectangle with rounded corners radius/.initial=4pt,
rectangle with rounded corners mode/.initial={i}
}
\def\pgf@lib@sh@rwrc@options@#1#2#3#4#5#6#7{%
\edef\pgf@lib@sh@rwrc@options@R{\csname rwrcpR#1\endcsname}%
\edef\pgf@lib@sh@rwrc@options@M{\csname rwrcpM#1\endcsname}%
\def\pgf@lib@sh@rwrc@options@A{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@#2\endcsname}{\pgfpoint{#4\outerxsep}{#5\outerysep}}}%
\def\pgf@lib@sh@rwrc@options@B{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@#3\endcsname}{\pgfpoint{#6\outerxsep}{#7\outerysep}}}%
}
\def\pgf@lib@sh@rwrc@options#1{%
\expandafter\pgf@lib@sh@rwrc@options@
\ifcase#1??????\or{ne}{north east}{north}--{0*}-\or
{nw}{north west}{west}+-+{0*}\or
{sw}{south west}{south}++{0*}+\or
{se}{south east}{east}-+-{0*}\or
??????\fi}
\def\pgfutil@firstofmany#1#2\pgf@stop{#1}
\def\pgf@lib@sh@rwrc@r#1,#2,#3,#4,#5\pgf@stop{%
\pgfmathsetlengthmacro\rwrcpRne{#1}%
\edef\pgf@temp{#2}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpRnw\rwrcpRne
\else
\pgfmathsetlengthmacro\rwrcpRnw{#2}%
\fi
\edef\pgf@temp{#3}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpRsw\rwrcpRnw
\else
\pgfmathsetlengthmacro\rwrcpRsw{#3}%
\fi
\edef\pgf@temp{#4}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpRse\rwrcpRsw
\else
\pgfmathsetlengthmacro\rwrcpRse{#4}%
\fi
}
\def\pgf@lib@sh@rwrc@m#1,#2,#3,#4,#5\pgf@stop{%
\edef\rwrcpMne{#1}%
\edef\pgf@temp{#2}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpMnw\rwrcpMne
\else
\let\rwrcpMnw\pgf@temp
\fi
\edef\pgf@temp{#3}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpMsw\rwrcpMnw
\else
\let\rwrcpMsw\pgf@temp
\fi
\edef\pgf@temp{#4}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpMse\rwrcpMsw
\else
\let\rwrcpMse\pgf@temp%
\fi
}
\pgfdeclareshape{rectangle with rounded corners}{%
\savedmacro\rectangleWithRoundedCornersParameters{
\pgfkeysgetvalue{/pgf/rectangle with rounded corners radius}\pgf@temp
\expandafter\pgf@lib@sh@rwrc@r\pgf@temp,,,,\pgf@stop
\pgfkeysgetvalue{/pgf/rectangle with rounded corners mode}\pgf@temp
\expandafter\pgf@lib@sh@rwrc@m\pgf@temp,,,,\pgf@stop
%
\addtosavedmacro\rwrcpRne
\addtosavedmacro\rwrcpRnw
\addtosavedmacro\rwrcpRsw
\addtosavedmacro\rwrcpRse
\addtosavedmacro\rwrcpMne
\addtosavedmacro\rwrcpMnw
\addtosavedmacro\rwrcpMsw
\addtosavedmacro\rwrcpMse
%
\pgfutil@tempdima.5\pgflinewidth
\edef\halflinewidth{\the\pgfutil@tempdima}%
\addtosavedmacro\halflinewidth
%
\pgf@x=\wd\pgfnodeparttextbox%
\pgfmathsetlength\pgf@xc{\pgfkeysvalueof{/pgf/inner xsep}}%
\advance\pgf@x by 2\pgf@xc%
\pgfmathsetlength\pgf@xb{\pgfkeysvalueof{/pgf/minimum width}}%
\ifdim\pgf@x>\pgf@xb%
\pgf@xb=\pgf@x%
\fi%
%
\pgf@y=\ht\pgfnodeparttextbox%
\advance\pgf@y by\dp\pgfnodeparttextbox%
\pgfmathsetlength\pgf@yc{\pgfkeysvalueof{/pgf/inner ysep}}%
\advance\pgf@y by 2\pgf@yc%
\pgfmathsetlength\pgf@yb{\pgfkeysvalueof{/pgf/minimum height}}%
\ifdim\pgf@y>\pgf@yb%
\pgf@yb=\pgf@y%
\fi%
%
\pgfextract@process\northeast{%
\pgf@y\pgf@yb
\pgf@x\pgf@xb
%
\pgf@x=.5\pgf@x%
\advance\pgf@x by.5\wd\pgfnodeparttextbox%
\pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/outer xsep}}%
\advance\pgf@x by\pgf@xa%
%
\pgf@y=.5\pgf@y%
\advance\pgf@y by-.5\dp\pgfnodeparttextbox%
\advance\pgf@y by.5\ht\pgfnodeparttextbox%
\pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/pgf/outer ysep}}%
\advance\pgf@y by\pgf@ya%
}
\addtosavedmacro\northeast
%
\pgfextract@process\southwest{%
\pgf@y\pgf@yb
\pgf@x\pgf@xb
%
\pgf@x=-.5\pgf@x%
\advance\pgf@x by.5\wd\pgfnodeparttextbox%
\pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/outer xsep}}%
\advance\pgf@x by-\pgf@xa%
%
\pgf@y=-.5\pgf@y%
\advance\pgf@y by-.5\dp\pgfnodeparttextbox%
\advance\pgf@y by.5\ht\pgfnodeparttextbox%
\pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/pgf/outer ysep}}%
\advance\pgf@y by-\pgf@ya%
}
\addtosavedmacro\southwest
}
\anchor{center}{
\rectangleWithRoundedCornersParameters
\pgf@process{\northeast}%
\pgf@xa=.5\pgf@x%
\pgf@ya=.5\pgf@y%
\pgf@process{\southwest}%
\pgf@x=.5\pgf@x%
\pgf@y=.5\pgf@y%
\advance\pgf@x by \pgf@xa%
\advance\pgf@y by \pgf@ya%
}
\anchor{mid}{\expandafter\csname \anchor{mid}{\csname pgf@anchor@rectangle with rounded corners@center\endcsname\pgfmathsetlength\pgf@y{.5ex}}
\anchor{base}{\expandafter\csname \anchor{base}{\csname pgf@anchor@rectangle with rounded corners@center\endcsname\pgf@y=0pt}
\anchor{north}{
\rectangleWithRoundedCornersParameters
\pgf@process{\southwest}%
\pgf@xa=.5\pgf@x%
\pgf@process{\northeast}%
\pgf@x=.5\pgf@x%
\advance\pgf@x by \pgf@xa%
}
\anchor{south}{
\rectangleWithRoundedCornersParameters
\pgf@process{\northeast}%
\pgf@xa=.5\pgf@x%
\pgf@process{\southwest}%
\pgf@x=.5\pgf@x%
\advance\pgf@x by \pgf@xa%
}
\anchor{west}{
\rectangleWithRoundedCornersParameters
\pgf@process{\northeast}%
\pgf@ya=.5\pgf@y%
\pgf@process{\southwest}%
\pgf@y=.5\pgf@y%
\advance\pgf@y by \pgf@ya%
}
\anchor{mid west}{\rectangleWithRoundedCornersParameters\southwest\pgfmathsetlength\pgf@y{.5ex}}
\anchor{base west}{\rectangleWithRoundedCornersParameters\southwest\pgf@y=0pt}
\anchor{north west}{
\rectangleWithRoundedCornersParameters
\southwest
\pgf@xa=\pgf@x
\northeast
\pgf@x=\pgf@xa}
\anchor{south west}{\rectangleWithRoundedCornersParameters\southwest}
\anchor{east}{%
\rectangleWithRoundedCornersParameters
\pgf@process{\southwest}%
\pgf@ya=.5\pgf@y%
\pgf@process{\northeast}%
\pgf@y=.5\pgf@y%
\advance\pgf@y by \pgf@ya%
}
\anchor{mid east}{\rectangleWithRoundedCornersParameters\northeast\pgfmathsetlength\pgf@y{.5ex}}
\anchor{base east}{\rectangleWithRoundedCornersParameters\northeast\pgf@y=0pt}
\anchor{north east}{\rectangleWithRoundedCornersParameters\northeast}
\anchor{south east}{
\rectangleWithRoundedCornersParameters
\northeast
\pgf@xa=\pgf@x
\southwest
\pgf@x=\pgf@xa
}
\backgroundpath{%
\rectangleWithRoundedCornersParameters
\pgfmathsetlengthmacro\outerxsep{\pgfkeysvalueof{/pgf/outer xsep}}%
\pgfmathsetlengthmacro\outerysep{\pgfkeysvalueof{/pgf/outer ysep}}%
\pgfpathmoveto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@east\endcsname}{\pgfqpoint{-\outerysep}{0pt}}}%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMne.\pgf@stop}
corners@east\endcsname}{\pgfqpoint{-\outerxsep}{0pt}}}%
\pgfmathloop
\ifnum\pgfmathcounter>4\relax
\pgfpathclose
\else
\pgf@lib@sh@rwrc@options\pgfmathcounter%
\pgfsetcornersarced{\pgfqpoint{\pgf@lib@sh@rwrc@options@R}{\pgf@lib@sh@rwrc@options@R}}%
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfqpoint{-\outerxsep}{-\outerysep}}}%
o\pgf@lib@sh@rwrc@options@M
\pgfsetcornersarced{\pgfqpoint{-\pgf@lib@sh@rwrc@options@R}{-\pgf@lib@sh@rwrc@options@R}}%
\edef\pgf@lib@sh@rwrc@options@R{-\pgf@lib@sh@rwrc@options@R}%
\def\pgf@lib@sh@rwrc@options@M{i}%
\fi %
\if i\pgf@lib@sh@rwrc@options@M
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfpoint{-\outerxsep}{-\outerysep-\rwrcpRne}}}%
\pgf@sh@rwrc@arc{\rwrcpRne}{1}{north east}{-\outerxsep-\rwrcpRne}{-\outerysep}%
h\pgf@lib@sh@rwrc@options@M
\ifcase\pgfmathcounter
\or % ne
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{\pgf@lib@sh@rwrc@options@R}{0pt}}}
\or % nw
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{-\pgf@lib@sh@rwrc@options@R}{0pt}}}
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\or % sw
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{-\pgf@lib@sh@rwrc@options@R}{0pt}}}
\or % se
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{\pgf@lib@sh@rwrc@options@R}{0pt}}}
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\fi
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfpoint{-\outerxsep}{-\outerysep+\rwrcpRne}}}%
\pgf@sh@rwrc@arc{\rwrcpRne}{0}{north east}{-\outerxsep-\rwrcpRne}{-\outerysep}%
\else v\pgf@lib@sh@rwrc@options@M
\ifcase\pgfmathcounter
\or % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfpointscale{-1}{\pgfpoint{\outerxsep}{\outerysep+\rwrcpRne}}}}%
\pgf@sh@rwrc@arc{\rwrcpRne}{0}{north east}{-\outerxsep+\rwrcpRne}{-\outerysep}%
ne
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{0pt}{\pgf@lib@sh@rwrc@options@R}}}
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\or % nw
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{0pt}{\pgf@lib@sh@rwrc@options@R}}}
\or % sw
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{0pt}{-\pgf@lib@sh@rwrc@options@R}}}
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\or % se
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\pgfpathlineto{\pgfpointadd{\pgf@lib@sh@rwrc@options@A}{\pgfqpoint{0pt}{-\pgf@lib@sh@rwrc@options@R}}}
\fi
\else
\pgfsetcornersarced{\pgfpointorigin}%
\pgfpathlineto{\pgf@lib@sh@rwrc@options@A}%
\fi
\fi
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north\endcsname}{\pgfqpoint{0pt}{-\outerysep}}}%
\fi
%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMnw.\pgf@stop}
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfqpoint{+\outerxsep}{-\outerysep}}}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfpoint{\outerxsep+\rwrcpRnw}{-\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRnw}{1}{north west}{\outerxsep}{-\outerysep-\rwrcpRnw}%
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfpoint{\outerxsep+\rwrcpRnw}{-\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRnw}{0}{north west}{\outerxsep}{-\outerysep+\rwrcpRnw}%
\else % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfpoint{\outerxsep-\rwrcpRnw}{-\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRnw}{0}{north west}{\outerxsep}{-\outerysep-\rwrcpRnw}%
\fi
\fi
\fi
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@west\endcsname}{\pgfqpoint{\outerxsep}{0pt}}}%
%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMsw.\pgf@stop}
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfqpoint{\outerxsep}{\outerysep}}}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfpoint{\outerxsep}{\outerysep+\rwrcpRsw}}}%
\pgf@sh@rwrc@arc{\rwrcpRsw}{1}{south west}{\outerxsep+\rwrcpRsw}{\outerysep}%
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfpoint{\outerxsep}{\outerysep-\rwrcpRsw}}}%
\pgf@sh@rwrc@arc{\rwrcpRsw}{0}{south west}{\outerxsep+\rwrcpRsw}{\outerysep}%
\else % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfpoint{\outerxsep}{\outerysep+\rwrcpRsw}}}%
\pgf@sh@rwrc@arc{\rwrcpRsw}{0}{south west}{\outerxsep-\rwrcpRsw}{\outerysep}%
\fi
\fi
\fi
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south\endcsname}{\pgfqpoint{0pt}{\outerysep}}}%
%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMse.\pgf@stop}
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfqpoint{-\outerxsep}{\outerysep}}}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfpoint{-\outerxsep-\rwrcpRse}{\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRse}{1}{south east}{-\outerxsep}{\outerysep+\rwrcpRse}%
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfpoint{-\outerxsep-\rwrcpRse}{\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRse}{0}{south east}{-\outerxsep}{\outerysep-\rwrcpRse}%
\else % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfpoint{-\outerxsep+\rwrcpRse}{\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRse}{0}{south east}{-\outerxsep}{\outerysep+\rwrcpRse}%
\fi
\fi
\fi
\pgfpathclose
\pgfpathlineto{\pgf@lib@sh@rwrc@options@B}%
\repeatpgfmathloop
}
}
\def\pgf@sh@rwrc@arc#1#2#3#4#5{%
\pgfpatharcto{#1}{#1}{0}{0}{#2}{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@#3\endcsname}{\pgfpoint{#4}{#5}}}}
\begingroup
\expandafter\def\expandafter\pgf@temp\expandafter{\expandafter\gdef\csname pgf@anchor@rectangle with rounded corners@border\endcsname##1}
\expandafter\pgf@temp\expandafter{\expandafter\rectangleWithRoundedCornersParameters\pgf@anchor@rectangle@border{#1}}
\endgroup
\makeatother
\tikzset{
shape example/.style={
color=black!30,
draw,
fill=yellow!30,
line width=.1cm,
inner xsep=2.5cm,
inner ysep=0.5cm}
}
\begin{document}
\begin{tikzpicture}[
rectangle with rounded corners mode={i,i,h,v},
mode={o,i,h,v},
rectangle with rounded corners radius={-40pt,10pt,20pt,30pt}
radius={40pt,10pt,20pt,30pt}
]\Huge
\node[shape example,rectangle with rounded corners,name=s]{Rectangle\vrule width 1pt height 2cm};
\foreach \anchor/\placement in {north west/above left, north/above, north east/above right,
west/left, center/above, east/right,
mid west/right, mid/above, mid east/left,
base west/left, base/below, base east/right,
south west/below left, south/below, south east/below right,
text/left, 10/right, 130/above%
}
\draw[shift=(s.\anchor)] plot[mark=x] coordinates{(0,0)} node[\placement] {\scriptsize\texttt{(s.\anchor)}};
\end{tikzpicture}
\end{document}
## Output
![alt text][1]
[1]: http://texwelt.de/wissen/upfiles/de1180-0.pnghttp://texwelt.de/wissen/upfiles/de1180-0_1.png
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Fangen wir mal mit was an.
Der Code definiert ein Shape mit dem Namen `rectangle with rounded corners`. Dazu nötig sind außerdem die Keys
- `rectangle with rounded corners mode` sowie
- `rectangle with rounded corners radius`.
Beim Modus werden unterschieden:
- `none`: keine Abrundung erfolgt.
- `inside`: eine klassische Abrundung wie mit der Option `rounded corners` erfolgt.
- `vertical`: es entsteht ein Zipfel in vertikaler Richtung.
- `horizontal`: es entsteht ein Zipfel in horizontaler Richtung
Werden weniger als vier Einträge angegeben wird der letzte für alle folgende wiederholt. Der erste Eintrag gilt für die Nordost-Ecke, die anderen Ecken folgen gegen den Uhrzeigersinn (mathematisch positiv wie sonst auch in TikZ/PGF). Es kann auch nur der erste Buchstabe (`n`, `i`, `v`, `h`) angegeben werden, wobei alles andere als `n`, `i` oder `v` als `h` behandelt wird.
Der `radius`-Key funktioniert im Prinzip genauso. Er wird ignoriert, falls die Ecke im Modus `none` gezeichnet werden soll. Ein negativer Radius führt beim `inside`-Modus zu einem interessanten Effekt (der allerdings auch mit der `rounded corners` entsteht). Ein negativer Radius im vertikalen Modus führt zu einer horizontalen Ecke und umgekehrt. Im Nachhinein hätte das Ganze etwas effektiver programmiert werden können:
- PGF-`rounded corners`-Option im `inside`-Modus verwenden (vermutlich im Low-Level effektiver).
- Der Fakt, dass der vertikale Modus und der horizontale Modus nur anhand des Radiusvorzeichen unterscheidbar ist, hätte das Ganze kürzer machen können.
Eventuell werde ich die obige Punkte noch updaten.
Ebenso fehlt dem Shape noch jegliche Anchors, die mit den abgerundeten Ecken zu tun haben, man kann also keine Koordinaten an den Enden der Bögen auswählen (das ist relativ einfach nachzuarbeiten). Genauso funktionieren die angulären Anchors nicht (die sogenannte Anchor-Border), das ist auch nicht so einfach nachzuarbeiten, da wie es mit Viertelkreisen zu tun haben. Vermutlich müsste man die `intersections`-Library dazu verwenden.
Achtung, es erfolgt keine Kontrolle auf Sinnhaftigkeit der Radien, sie sollten kleiner gewählt werden als die Hälfte der Breite und der Höhe der Node!
## Code
\documentclass[tikz,convert=false]{standalone}
\makeatletter
\pgfset{
rectangle with rounded corners radius/.initial=4pt,
rectangle with rounded corners mode/.initial={i}
}
\def\pgfutil@firstofmany#1#2\pgf@stop{#1}
\def\pgf@lib@sh@rwrc@r#1,#2,#3,#4,#5\pgf@stop{%
\pgfmathsetlengthmacro\rwrcpRne{#1}%
\edef\pgf@temp{#2}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpRnw\rwrcpRne
\else
\pgfmathsetlengthmacro\rwrcpRnw{#2}%
\fi
\edef\pgf@temp{#3}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpRsw\rwrcpRnw
\else
\pgfmathsetlengthmacro\rwrcpRsw{#3}%
\fi
\edef\pgf@temp{#4}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpRse\rwrcpRsw
\else
\pgfmathsetlengthmacro\rwrcpRse{#4}%
\fi
}
\def\pgf@lib@sh@rwrc@m#1,#2,#3,#4,#5\pgf@stop{%
\edef\rwrcpMne{#1}%
\edef\pgf@temp{#2}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpMnw\rwrcpMne
\else
\let\rwrcpMnw\pgf@temp
\fi
\edef\pgf@temp{#3}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpMsw\rwrcpMnw
\else
\let\rwrcpMsw\pgf@temp
\fi
\edef\pgf@temp{#4}%
\ifx\pgf@temp\pgfutil@empty
\let\rwrcpMse\rwrcpMsw
\else
\let\rwrcpMse\pgf@temp%
\fi
}
\pgfdeclareshape{rectangle with rounded corners}{%
\savedmacro\rectangleWithRoundedCornersParameters{
\pgfkeysgetvalue{/pgf/rectangle with rounded corners radius}\pgf@temp
\expandafter\pgf@lib@sh@rwrc@r\pgf@temp,,,,\pgf@stop
\pgfkeysgetvalue{/pgf/rectangle with rounded corners mode}\pgf@temp
\expandafter\pgf@lib@sh@rwrc@m\pgf@temp,,,,\pgf@stop
%
\addtosavedmacro\rwrcpRne
\addtosavedmacro\rwrcpRnw
\addtosavedmacro\rwrcpRsw
\addtosavedmacro\rwrcpRse
\addtosavedmacro\rwrcpMne
\addtosavedmacro\rwrcpMnw
\addtosavedmacro\rwrcpMsw
\addtosavedmacro\rwrcpMse
%
\pgfutil@tempdima.5\pgflinewidth
\edef\halflinewidth{\the\pgfutil@tempdima}%
\addtosavedmacro\halflinewidth
%
\pgf@x=\wd\pgfnodeparttextbox%
\pgfmathsetlength\pgf@xc{\pgfkeysvalueof{/pgf/inner xsep}}%
\advance\pgf@x by 2\pgf@xc%
\pgfmathsetlength\pgf@xb{\pgfkeysvalueof{/pgf/minimum width}}%
\ifdim\pgf@x>\pgf@xb%
\pgf@xb=\pgf@x%
\fi%
%
\pgf@y=\ht\pgfnodeparttextbox%
\advance\pgf@y by\dp\pgfnodeparttextbox%
\pgfmathsetlength\pgf@yc{\pgfkeysvalueof{/pgf/inner ysep}}%
\advance\pgf@y by 2\pgf@yc%
\pgfmathsetlength\pgf@yb{\pgfkeysvalueof{/pgf/minimum height}}%
\ifdim\pgf@y>\pgf@yb%
\pgf@yb=\pgf@y%
\fi%
%
\pgfextract@process\northeast{%
\pgf@y\pgf@yb
\pgf@x\pgf@xb
%
\pgf@x=.5\pgf@x%
\advance\pgf@x by.5\wd\pgfnodeparttextbox%
\pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/outer xsep}}%
\advance\pgf@x by\pgf@xa%
%
\pgf@y=.5\pgf@y%
\advance\pgf@y by-.5\dp\pgfnodeparttextbox%
\advance\pgf@y by.5\ht\pgfnodeparttextbox%
\pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/pgf/outer ysep}}%
\advance\pgf@y by\pgf@ya%
}
\addtosavedmacro\northeast
%
\pgfextract@process\southwest{%
\pgf@y\pgf@yb
\pgf@x\pgf@xb
%
\pgf@x=-.5\pgf@x%
\advance\pgf@x by.5\wd\pgfnodeparttextbox%
\pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/outer xsep}}%
\advance\pgf@x by-\pgf@xa%
%
\pgf@y=-.5\pgf@y%
\advance\pgf@y by-.5\dp\pgfnodeparttextbox%
\advance\pgf@y by.5\ht\pgfnodeparttextbox%
\pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/pgf/outer ysep}}%
\advance\pgf@y by-\pgf@ya%
}
\addtosavedmacro\southwest
}
\anchor{center}{
\rectangleWithRoundedCornersParameters
\pgf@process{\northeast}%
\pgf@xa=.5\pgf@x%
\pgf@ya=.5\pgf@y%
\pgf@process{\southwest}%
\pgf@x=.5\pgf@x%
\pgf@y=.5\pgf@y%
\advance\pgf@x by \pgf@xa%
\advance\pgf@y by \pgf@ya%
}
\anchor{mid}{\expandafter\csname pgf@anchor@rectangle with rounded corners@center\endcsname\pgfmathsetlength\pgf@y{.5ex}}
\anchor{base}{\expandafter\csname pgf@anchor@rectangle with rounded corners@center\endcsname\pgf@y=0pt}
\anchor{north}{
\rectangleWithRoundedCornersParameters
\pgf@process{\southwest}%
\pgf@xa=.5\pgf@x%
\pgf@process{\northeast}%
\pgf@x=.5\pgf@x%
\advance\pgf@x by \pgf@xa%
}
\anchor{south}{
\rectangleWithRoundedCornersParameters
\pgf@process{\northeast}%
\pgf@xa=.5\pgf@x%
\pgf@process{\southwest}%
\pgf@x=.5\pgf@x%
\advance\pgf@x by \pgf@xa%
}
\anchor{west}{
\rectangleWithRoundedCornersParameters
\pgf@process{\northeast}%
\pgf@ya=.5\pgf@y%
\pgf@process{\southwest}%
\pgf@y=.5\pgf@y%
\advance\pgf@y by \pgf@ya%
}
\anchor{mid west}{\rectangleWithRoundedCornersParameters\southwest\pgfmathsetlength\pgf@y{.5ex}}
\anchor{base west}{\rectangleWithRoundedCornersParameters\southwest\pgf@y=0pt}
\anchor{north west}{
\rectangleWithRoundedCornersParameters
\southwest
\pgf@xa=\pgf@x
\northeast
\pgf@x=\pgf@xa}
\anchor{south west}{\rectangleWithRoundedCornersParameters\southwest}
\anchor{east}{%
\rectangleWithRoundedCornersParameters
\pgf@process{\southwest}%
\pgf@ya=.5\pgf@y%
\pgf@process{\northeast}%
\pgf@y=.5\pgf@y%
\advance\pgf@y by \pgf@ya%
}
\anchor{mid east}{\rectangleWithRoundedCornersParameters\northeast\pgfmathsetlength\pgf@y{.5ex}}
\anchor{base east}{\rectangleWithRoundedCornersParameters\northeast\pgf@y=0pt}
\anchor{north east}{\rectangleWithRoundedCornersParameters\northeast}
\anchor{south east}{
\rectangleWithRoundedCornersParameters
\northeast
\pgf@xa=\pgf@x
\southwest
\pgf@x=\pgf@xa
}
\backgroundpath{%
\rectangleWithRoundedCornersParameters
\pgfmathsetlengthmacro\outerxsep{\pgfkeysvalueof{/pgf/outer xsep}}%
\pgfmathsetlengthmacro\outerysep{\pgfkeysvalueof{/pgf/outer ysep}}%
\pgfpathmoveto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@east\endcsname}{\pgfqpoint{-\outerysep}{0pt}}}%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMne.\pgf@stop}
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfqpoint{-\outerxsep}{-\outerysep}}}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfpoint{-\outerxsep}{-\outerysep-\rwrcpRne}}}%
\pgf@sh@rwrc@arc{\rwrcpRne}{1}{north east}{-\outerxsep-\rwrcpRne}{-\outerysep}%
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfpoint{-\outerxsep}{-\outerysep+\rwrcpRne}}}%
\pgf@sh@rwrc@arc{\rwrcpRne}{0}{north east}{-\outerxsep-\rwrcpRne}{-\outerysep}%
\else % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north east\endcsname}{\pgfpointscale{-1}{\pgfpoint{\outerxsep}{\outerysep+\rwrcpRne}}}}%
\pgf@sh@rwrc@arc{\rwrcpRne}{0}{north east}{-\outerxsep+\rwrcpRne}{-\outerysep}%
\fi
\fi
\fi
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north\endcsname}{\pgfqpoint{0pt}{-\outerysep}}}%
%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMnw.\pgf@stop}
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfqpoint{+\outerxsep}{-\outerysep}}}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfpoint{\outerxsep+\rwrcpRnw}{-\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRnw}{1}{north west}{\outerxsep}{-\outerysep-\rwrcpRnw}%
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfpoint{\outerxsep+\rwrcpRnw}{-\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRnw}{0}{north west}{\outerxsep}{-\outerysep+\rwrcpRnw}%
\else % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@north west\endcsname}{\pgfpoint{\outerxsep-\rwrcpRnw}{-\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRnw}{0}{north west}{\outerxsep}{-\outerysep-\rwrcpRnw}%
\fi
\fi
\fi
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@west\endcsname}{\pgfqpoint{\outerxsep}{0pt}}}%
%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMsw.\pgf@stop}
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfqpoint{\outerxsep}{\outerysep}}}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfpoint{\outerxsep}{\outerysep+\rwrcpRsw}}}%
\pgf@sh@rwrc@arc{\rwrcpRsw}{1}{south west}{\outerxsep+\rwrcpRsw}{\outerysep}%
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfpoint{\outerxsep}{\outerysep-\rwrcpRsw}}}%
\pgf@sh@rwrc@arc{\rwrcpRsw}{0}{south west}{\outerxsep+\rwrcpRsw}{\outerysep}%
\else % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south west\endcsname}{\pgfpoint{\outerxsep}{\outerysep+\rwrcpRsw}}}%
\pgf@sh@rwrc@arc{\rwrcpRsw}{0}{south west}{\outerxsep-\rwrcpRsw}{\outerysep}%
\fi
\fi
\fi
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south\endcsname}{\pgfqpoint{0pt}{\outerysep}}}%
%
\edef\pgf@sh@rwrcpM{\expandafter\pgfutil@firstofmany\rwrcpMse.\pgf@stop}
\if n\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfqpoint{-\outerxsep}{\outerysep}}}%
\else\if i\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfpoint{-\outerxsep-\rwrcpRse}{\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRse}{1}{south east}{-\outerxsep}{\outerysep+\rwrcpRse}%
\else\if v\pgf@sh@rwrcpM
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfpoint{-\outerxsep-\rwrcpRse}{\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRse}{0}{south east}{-\outerxsep}{\outerysep-\rwrcpRse}%
\else % must be horizontal
\pgfpathlineto{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@south east\endcsname}{\pgfpoint{-\outerxsep+\rwrcpRse}{\outerysep}}}%
\pgf@sh@rwrc@arc{\rwrcpRse}{0}{south east}{-\outerxsep}{\outerysep+\rwrcpRse}%
\fi
\fi
\fi
\pgfpathclose
}
}
\def\pgf@sh@rwrc@arc#1#2#3#4#5{%
\pgfpatharcto{#1}{#1}{0}{0}{#2}{\pgfpointadd{\csname pgf@anchor@rectangle with rounded corners@#3\endcsname}{\pgfpoint{#4}{#5}}}}
\begingroup
\expandafter\def\expandafter\pgf@temp\expandafter{\expandafter\gdef\csname pgf@anchor@rectangle with rounded corners@border\endcsname##1}
\expandafter\pgf@temp\expandafter{\expandafter\rectangleWithRoundedCornersParameters\pgf@anchor@rectangle@border{#1}}
\endgroup
\makeatother
\tikzset{
shape example/.style={
color=black!30,
draw,
fill=yellow!30,
line width=.1cm,
inner xsep=2.5cm,
inner ysep=0.5cm}
}
\begin{document}
\begin{tikzpicture}[
rectangle with rounded corners mode={i,i,h,v},
rectangle with rounded corners radius={-40pt,10pt,20pt,30pt}
]\Huge
\node[shape example,rectangle with rounded corners,name=s]{Rectangle\vrule width 1pt height 2cm};
\foreach \anchor/\placement in {north west/above left, north/above, north east/above right,
west/left, center/above, east/right,
mid west/right, mid/above, mid east/left,
base west/left, base/below, base east/right,
south west/below left, south/below, south east/below right,
text/left, 10/right, 130/above%
}
\draw[shift=(s.\anchor)] plot[mark=x] coordinates{(0,0)} node[\placement] {\scriptsize\texttt{(s.\anchor)}};
\end{tikzpicture}
\end{document}
## Output
![alt text][1]
[1]: http://texwelt.de/wissen/upfiles/de1180-0.png
