Node shapes in TikZ

Question

I want to draw a block diagram for a software app and I need two shapes which I couldn't find on the Internet. The shapes are a parallelogram and a rectangle with double side margins.

One is for data and the other for a predefined process. They look like this:

Does anyone know how could I draw those two shapes (maybe using TikZ)?

Answer 1

The double side margin rectangle can be created using a rectangle split, the parallelogram using a trapezium:

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{shapes,shapes.multipart}
\begin{document}

\begin{tikzpicture}
\node [draw,trapezium,trapezium left angle=70,trapezium right angle=-70,minimum height=1cm] {Data};

\node at (0,-2)[draw,rectangle split, rectangle split horizontal,rectangle split parts=3,minimum height=1cm] {\nodepart{two}\shortstack{Predefined\\Process}};

\end{tikzpicture}
\end{document}

Answer 2

You could use a trapezium for the data:

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\begin{document}
\begin{tikzpicture}[datashape/.style={
  trapezium, draw, trapezium left angle=60,
  trapezium right angle=-60}]
\node[datashape] {Data};
\end{tikzpicture}
\end{document}

Answer 3

A very easy way for the parallelogram "data" is using the xslant option:

\node [rectangle, draw, xslant=0.4] at (0,0) {Data};

Don't forget the draw option for borders. This way doesn't even need the shapes library and is shorter than the trapezium variant.

Answer 4

Have a look at What is the easiest way to draw 3D cube with TikZ? (and my answer to it) to see how to define new node shapes in PGF. It should not be too hard to adapt a rectangle shape to get your predefined process node.

I am on a bus right now so I can't do it for you, maybe later.