calculations correct

31 January 2017

We recently watched The Martian — just a year behind everyone else — and one scene in particular stood out. For your use with Beamer, I give you \kwcalculationscorrect:


\makeatletter
\def\ft@overlay{}
\definecolor{RGB}{123,175,212}
\addtobeamertemplate{footline}{}{%
	\lineskiplimit0pt
	\begin{tikzpicture}[remember picture,overlay]%
	\ft@overlay
	\end{tikzpicture}%
	\gdef\ft@overlay{}%
}
\newcommand<>{\kwcalculationscorrect}{%
	\pause
	\only<.(1)>{\gdef\ft@overlay{
		\lineskip=4pt
		\draw[fill=black,opacity=0.50]
			(current page.north east)
			rectangle (current page.south west);
		\node[
			align=center,
			draw=carolinablue!80!white,
			fill=black,
			font=\Large,
			inner sep=8pt,
			line width=4pt,
			text=carolinablue!30!white,
		] at (current page.center) {\bf CALCULATIONS\\\bf CORRECT};
	}}%
}
\makeatother

Example usage:


\begin{frame}{Integral of a constant function}
	What is $\int_{x_1}^{x_2} c dx$?
	\pause
	\[
		\int_{x_1}^{x_2} c dx = \left( x_2 - x_1 \right) c.
	\]
	\vspace{4cm}
	\kwcalculationscorrect
\end{frame}

Hat tip to this LaTeX Stack Exchange post.

All included LaTeX graphics are generated at LaTeX to png .

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