A \node
does understand a kind of a clip
of its path, the path picture
(which actually exists for every path).
This is great if you want to create a node shape without defining a new shape.
The path picture
key provides a path picture bounding box
pseudo-node that is installed only for the path picture and has the properties of a rectangular node (it is a node of the shape rectangle
).
Both a blessing and a curse, it inherits every property of the parental node.
It is a blessing for defining variations of the diamond
shape that simply inherits the color information of its parent.
It is a curse for such complexity that you would have with the last example of percusse’s answer. The line width as well as the minimum width and height do need to be reset. The additional \pgftransformreset
is needed as the local coordinate system has its center in the center of the path picture/node.
Code
\documentclass[tikz,convert=false]{standalone}
\usetikzlibrary{shapes.callouts,shapes.geometric}
\tikzset{
left diamond/.style={shape=diamond,
path picture={\fill[#1] (path picture bounding box.south west) rectangle
(path picture bounding box.north);}},
right diamond/.style={shape=diamond,
path picture={\fill[#1] (path picture bounding box.south east) rectangle
(path picture bounding box.north);}},
square diamond/.style={shape=diamond,
path picture={
\path (path picture bounding box.south west) --
(path picture bounding box.north east) coordinate[pos=.15] (@aux1)
coordinate[pos=.85] (@aux2);
\fill[#1] (@aux1) rectangle (@aux2);}},
stripe diamond/.style={shape=diamond,
path picture={
\path (path picture bounding box.south west) --
(path picture bounding box.north west) coordinate[near start] (@aux1)
coordinate[near end] (@aux2);
\fill[#1] (@aux1) rectangle (path picture bounding box.north east |- @aux2);}}}
\begin{document}
\begin{tikzpicture}[every diamond node/.append style={draw,minimum size=+1cm}]
\matrix[row sep=.5cm,column sep=.5cm] {
\node[diamond] {}; & \node[left diamond] {}; \\
\node[left diamond, green] {}; & \node[right diamond=red, blue] {}; \\
\node[square diamond] {}; & \node[stripe diamond] {}; \\
};
\end{tikzpicture}
\begin{tikzpicture}
\draw[top color= black!50] (-2,-2) rectangle (5,4);
\node[
shape=cloud callout,
draw,
fill=white,
minimum width=5cm,
minimum height=3cm,
line width=1mm,
anchor=center,
path picture={
\pgftransformreset
\fill[red] (0cm,0cm) rectangle (1.5cm, 1.5cm);
\fill[yellow] (2cm,2cm) circle (1cm);
\node[fill=blue,rotate=90,isosceles triangle,draw,
thin,minimum width=0pt,minimum height=1.5cm] at (2.5cm,1cm) {};
}
] (nodename) at (1.5cm, 1.5cm) {};
\node[align=center,draw,anchor=north west] (a) at (nodename.pointer) {Geometric\\Thinker};
\end{tikzpicture}
\end{document}
Output

