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authorKarl Berry <karl@freefriends.org>2006-11-01 23:50:14 +0000
committerKarl Berry <karl@freefriends.org>2006-11-01 23:50:14 +0000
commitbcec5cf9be8a366b39aab4c13fa9e455b6e724ca (patch)
tree10af70bab7eedf89d55be20d1a3b9c334ad80ea3 /Master/texmf-dist/doc/latex/beamer/beamerug-tricks.tex
parent8cdb9ebeb89ec677972e7a568938c6a0dd313145 (diff)
beamer update to get solutions/ et al. (reported by gerben)
git-svn-id: svn://tug.org/texlive/trunk@2379 c570f23f-e606-0410-a88d-b1316a301751
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-% $Header: /cvsroot/latex-beamer/latex-beamer/doc/beamerug-tricks.tex,v 1.6 2004/11/01 16:18:45 tantau Exp $
-
-% Copyright 2003, 2004 by Till Tantau <tantau@users.sourceforge.net>.
-%
-% This program can be redistributed and/or modified under the terms
-% of the GNU Public License, version 2.
-
-
-
-\section{How To Uncover Things Piecewise}
-
-
-\subsection{Uncovering an Enumeration Piecewise}
-
-A common usage of overlays is to show a list of points in an
-enumeration in a piecewise fashion. The easiest and most flexible way
-to do this is the following:
-
-\begin{verbatim}
-\begin{itemize}
-\item<1-> First point.
-\item<2-> Second point.
-\item<3-> Third point.
-\end{itemize}
-\end{verbatim}
-
-The advantage of this approach is that you retain total control over
-the order in which items are shown. By changing, for example, the last
-specification to |<2->|, you can have the last two points uncovered at
-the same time.
-
-A disadvantage of the approach is that you will have to renumber
-everything if you add a new item. This is usually not such a big
-problem, but it can be a nuisance.
-
-To automatize the uncovering, you can use the following code:
-
-\begin{verbatim}
-\begin{itemize}[<+->]
-\item First point.
-\item Second point.
-\item Third point.
-\end{itemize}
-\end{verbatim}
-
-The effect of the |[<+->]| is to install a \emph{default overlay
- specification}, see the definition of |itemize| for details.
-
-Now, suppose you wish the second and third point to be shown at the
-same time. You could achieve this by adding the specification |<2->|
-to either the second or third |\item| command. However, then you still
-have to do some renumbering if you add a new item at the beginning. A
-better approach is to temporarily use a different overlay
-specification and the dot-notation:
-
-\begin{verbatim}
-\begin{itemize}[<+->]
-\item First point.
-\item[<.->] Second point.
-\item Third point.
-\end{itemize}
-\end{verbatim}
-
-You might wish to build your own macros based on these ideas (like an
-|itemstep| environment or a |\itemlikeprevious| command).
-
-
-
-\subsection{Hilighting the Current Item in an Enumeration}
-
-If you uncover an enumeration piecewise, it is sometimes a good idea
-to hilight the last uncovered point to draw the audience's attention
-to it. This is best achieved as follows:
-
-
-\begin{verbatim}
-\begin{itemize}
-\item<1-| alert@1> First point.
-\item<2-| alert@2> Second point.
-\item<3-| alert@3> Third point.
-\end{itemize}
-\end{verbatim}
-
-or
-
-\begin{verbatim}
-\begin{itemize}[<+-| alert@+>]
-\item First point.
-\item Second point.
-\item Third point.
-\end{itemize}
-\end{verbatim}
-
-Note that this will draw the little item symbol also in red.
-
-
-
-\subsection{Changing Symbol Before an Enumeration}
-
-When uncovering a list of tasks or problems, you may desire that the
-symbol in front of the last uncovered symbol is, say, a ballot~X,
-while for the previous items it is a check mark (you'll find these
-characters in some Dingbats fonts).
-
-The best way to achieve this is to implement a new action
-environment. If this action is activated, it temporarily changes the
-item symbol template to the other symbol:
-
-\begin{verbatim}
-\newenvironment{ballotenv}
-{\only{%
- \setbeamertemplate{itemize item}{code for showing a ballot}%
- \setbeamertemplate{itemize subitem}{code for showing a smaller ballot}%
- \setbeamertemplate{itemize subsubitem}{code for showing a smaller ballot}}}
-{}
-
-\setbeamertemplate{itemize item}{code for showing a check mark}
-\setbeamertemplate{itemize subitem}{code for showing a smaller check mark}
-\setbeamertemplate{itemize subsubitem}{code for showing a smaller check mark}
-\end{verbatim}
-
-The effect of the code is to install a check mark as the default
-template. If the action |ballot| is now requested for some item, this
-template will temporarily be replaced by the ballot templates.
-
-Note that the |ballotenv| is invoked with the overlay specification
-given for the action directly following it. This causes the |\only| to
-be invoked exactly for the specified overlays.
-
-Here are example usages:
-
-\begin{verbatim}
-\begin{itemize}
-\item<1-| ballot@1> First point.
-\item<2-| ballot@2> Second point.
-\item<3-| ballot@3> Third point.
-\end{itemize}
-\end{verbatim}
-
-and
-
-\begin{verbatim}
-\begin{itemize}[<+-| ballot@+>]
-\item First point.
-\item Second point.
-\item Third point.
-\end{itemize}
-\end{verbatim}
-
-In the following example, more and more items become ``checked'' from
-slide to slide:
-
-\begin{verbatim}
-\begin{itemize}[<ballot@+-| visible@1-,+(1)>]
-\item First point.
-\item Second point.
-\item Third point.
-\end{itemize}
-\end{verbatim}
-
-The important point is |ballot@+|. The funny |visible@1-,+(1)| has the
-following effect: Although it has no effect with respect to what is
-shown (after all, it applies to all slides), it ensures that in
-the enumeration the slide number 4 is mentioned. Thus there will also
-be a slide in which all three points are checked.
-
-
-\subsection{Uncovering Tagged Formulas Piecewise}
-
-Suppose you have a three-line formula as the following:
-\begin{verbatim}
-\begin{align}
- A &= B \\
- &= C \\
- &= D
-\end{align}
-\end{verbatim}
-
-Uncovering this formula line-by-line is a little tricky. A first idea
-is to use the |\pause| or |\onslide| commands. Unfortunately, these do
-not work since |align| internally reprocesses its input several times,
-which messes up the delicate internals of the commands. The next idea
-is the following, which works a little better:
-\begin{verbatim}
-\begin{align}
- A &= B \\
- \uncover<2->{&= C \\}
- \uncover<3->{&= D}
-\end{align}
-\end{verbatim}
-Unfortunately, this does not work in the presence of tags (so it works
-for the |align*| environment). What happens is that the tag of the
-last line is shown on all slides. The problem here is that the tag is
-created when |\\| is encountered or when |\end{align}| is
-encountered. In the last line these are already ``behind'' the
-|\uncover|.
-
-To solve this problem, you can add an empty line without a tag and then
-insert a negative vertical skip to undo the last line:
-\begin{verbatim}
-\begin{align}
- A &= B \\
- \uncover<2->{&= C \\}
- \uncover<3->{&= D \\}
- \notag
- \end{align}
-\vskip-1.5em
-\end{verbatim}
-
-
-\subsection{Uncovering a Table Rowwise}
-
-When you wish to uncover a table line-by-line, you will run into all
-sorts of problems if there are vertical and horizontal lines in the
-table. The reason is that the first vertical line at the left end is
-drawn before the line is even read (and thus, in particular, before
-any |\onslide| command can be read). However, placing a |\pause| or
-|\uncover| at the end of the line before is also not helpful since it
-will then suppress the horizontal line below the last uncovered line.
-
-A possible way to solve this problem is not to use either horizontal
-or vertical lines. Instead, colouring the lines using the |colortbl|
-package is a good alternative to structure the table. Here is an
-optically pleasing example, where the table is uncovered line-wise:
-
-\begin{verbatim}
-\rowcolors[]{1}{blue!20}{blue!10}
-\begin{tabular}{l!{\vrule}cccc}
- Class & A & B & C & D \\\hline
- X & 1 & 2 & 3 & 4 \pause\\
- Y & 3 & 4 & 5 & 6 \pause\\
- Z & 5 & 6 & 7 & 8
-\end{tabular}
-\end{verbatim}
-
-By using |\onslide| instead of |\pause|, you can get more fine-grained
-control over which line is shown on which slide.
-
-
-\subsection{Uncovering a Table Columnwise}
-
-The same problems as for uncovering a table linewise arise for
-uncovering it columnwise.
-
-Once more, using the |colortbl| package offers a solution. In the
-following example, the |tabular| header is used to insert |\onslide|
-commands, one for each column, that cover the entries in the column
-from a certain slide on. At the end of the last column, the |\onslide|
-without a specification ensures that the first column on the next row
-is once more shown normally.
-
-Inserting a horizontal line is tricky since it will protrude over the
-full width of the table also in the covered version. The best idea is
-just not to use horizontal bars.
-
-\begin{verbatim}
-\rowcolors[]{1}{blue!20}{blue!10}
-\begin{tabular}{l!{\vrule}c<{\onslide<2->}c<{\onslide<3->}c<{\onslide<4->}c<{\onslide}c}
- Class & A & B & C & D \\
- X & 1 & 2 & 3 & 4 \\
- Y & 3 & 4 & 5 & 6 \\
- Z & 5 & 6 & 7 & 8
-\end{tabular}
-\end{verbatim}
-
-
-
-%%% Local Variables:
-%%% mode: latex
-%%% TeX-master: "beameruserguide"
-%%% End: