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% !TeX root = tcolorbox.tex
% include file of tcolorbox.tex (manual of the LaTeX package tcolorbox)
\clearpage
\section{Library \mylib{raster}}\label{sec:raster}%
\tcbset{external/prefix=external/raster_}%
The library is loaded by a package option or inside the preamble by:
\begin{dispListing}
\tcbuselibrary{raster}
\end{dispListing}
%This also loads the package |xparse| \cite{latexproject:2015a}.

%The purpose of this library is to give comfortable access to the
%powerful document command production with |xparse| for |tcolorbox|.
%See the |xparse| package documentation \cite{latexproject:2015a}
%for details about the argument \meta{specification} used in this section.

\subsection{Concept of Rasters}\label{subsec:raster_overview}

A \emph{raster} is used to align several colored boxes in a regular way.
It can be seen as a far related counterpart to the |matrix| construct
of \tikzname, but it differs in many aspects.

In principle, |tcolorbox|es are arranged in rows and columns when put
inside a \refEnv{tcbraster} environment. The boxes are fluently added to the
raster like adding text to a paragraph.
Especially, line/row breaks are done
automatically and one cannot end a line/row ahead of schedule.
Further, a \emph{raster} is not restricted to a single page but may
break into an arbitrary series of pages.

\bigskip
\begin{tcolorbox}[enhanced,size=tight,boxrule=0pt,frame hidden,
  top=5mm,bottom=5mm,colback=yellow!20!white,
  borderline={0.4pt}{0pt}{dashed,yellow!50!black},
  finish={
  \draw[thick,<->] ([yshift=-1.3cm]frame.north west)-- node[below]{\refKey{/tcb/raster width}}
    ([yshift=-1.3cm]frame.north east);
  \draw[thick,<->] ([xshift=5mm,yshift=-5mm]frame.north east)-- node[left,pos=.75]{\refKey{/tcb/raster height}}
    ([xshift=5mm,yshift=5mm]frame.south east);
  }]
  \begin{tcbitemize}[enhanced,fontupper=\tiny,
    title={Box \#\thetcbrasternum},
    colframe=red!50!black!30!white,colback=red!10!white!40!white,
    colupper=black!20!white,
    raster equal height=rows,
    raster left skip=5mm,raster right skip=5mm,
    raster before skip=5mm,raster after skip=5mm,
    raster row skip=3mm,raster column skip=3mm,
    ]
  \tcbitem[finish={%
    \draw[thick,<->] (frame.west)-- node[below right]{\refKey{/tcb/raster left skip}}+(-0.5,0);
    \draw[thick,<->] (frame.north)-- node[right]{\refKey{/tcb/raster before skip}} +(0,0.5);
    \draw[thick,<->] (frame.south)-- node[above]{\refKey{/tcb/raster row skip}} +(0,-0.3);
    }] \lipsum[1]
  \tcbitem[finish={
    \draw[thick,<->] (frame.east)-- node[below left]{\refKey{/tcb/raster right skip}}+(0.5,0);
    \draw[thick,<->] ([yshift=5mm]frame.south west)-- node[above]{\refKey{/tcb/raster column skip}}+(-0.3,0);
    }] \lipsum[2]
  \tcbitem[finish={%
    \draw[thick,<->] (frame.south)-- node[right]{\refKey{/tcb/raster after skip}} +(0,-0.5);
    }] \lipsum[3]
  \tcbitem \lipsum[4]
  \end{tcbitemize}
\end{tcolorbox}

\clearpage
\begin{tcboutputlisting}
\begin{tcbraster}[raster columns=3,raster rows=3,raster height=\linewidth,
  enhanced,size=small,sharp corners,arc=8mm,colframe=red!50!black,
  colback=yellow!10!white,watermark overzoom=1.0,fit algorithm=hybrid* ]
  \begin{tcolorbox}[rounded corners=northwest,boxrule=0pt,
    watermark graphics=lichtspiel.jpg]\end{tcolorbox}
  \tcboxfit{\lipsum[1]}
  \begin{tcolorbox}[rounded corners=northeast,boxrule=0pt,
    watermark graphics=goldshade.png]\end{tcolorbox}
  \tcboxfit{\lipsum[2]}
  \begin{tcolorbox}[valign=center,halign=center]Nine Boxes.\end{tcolorbox}
  \tcboxfit{\lipsum[3]}
  \begin{tcolorbox}[rounded corners=southwest,boxrule=0pt,
    watermark graphics=goldshade.png]\end{tcolorbox}
  \tcboxfit{\lipsum[4]}
  \begin{tcolorbox}[rounded corners=southeast,boxrule=0pt,
    watermark graphics=lichtspiel.jpg]\end{tcolorbox}
\end{tcbraster}
\end{tcboutputlisting}

\tcbinputlisting{base example,listing only,listing style=mydocumentation}

\bigskip
{\tcbuselistingtext}

\clearpage
\subsection{Macros of the Library}\label{subsec:raster_macros}

\begin{docEnvironment}[doc new=2014-11-10]{tcbraster}{\oarg{options}}
A raster arranges enclosed boxes in a regular way, mainly into rows and
columns. The \meta{options} are used to control the raster
parameters and to set the properties for the enclosed boxes.
\begin{itemize}
\item The \emph{raster} is only allowed to contain a series of
  \refEnv{tcolorbox} environments or derived constructs.
  With some small restrictions, boxes created with \refCom{tcboxfit} can also be added.
  Boxes created with \refCom{tcbox} are not reasonable here, but may be
  used to a certain degree.
\item Do not add anything else between the boxes inside the raster with
  exception of white\-space. Especially, do not use |\\| or |\par| to end
  a row; row breaks are done automatically.
\item The boxes inside a raster are numbered automatically.
  \docAuxCommand{thetcbrasternum} may be used inside a box to access
  this number.
\end{itemize}

\begin{dispExample}
\begin{tcbraster}[raster columns=3, raster equal height,
  size=small,colframe=red!50!black,colback=red!10!white,colbacktitle=red!50!white,
  title={Box \# \thetcbrasternum}]
  \begin{tcolorbox}First box\end{tcolorbox}
  \begin{tcolorbox}Second box\end{tcolorbox}
  \begin{tcolorbox}This is a box\\with a second line\end{tcolorbox}
  \begin{tcolorbox}Another box\end{tcolorbox}
  \begin{tcolorbox}A box again\end{tcolorbox}
\end{tcbraster}
\end{dispExample}

\begin{dispExample}
\begin{tcbraster}[raster columns=2, raster equal height=rows,
  size=small,colframe=red!50!black,colback=red!10!white,colbacktitle=red!50!white,
  title={Box \# \thetcbrasternum}]
  \begin{tcolorbox}First box\end{tcolorbox}
  \begin{tcolorbox}Second box\end{tcolorbox}
  \begin{tcolorbox}This is a box\\with a second line\end{tcolorbox}
  \begin{tcolorbox}Another box\end{tcolorbox}
  \begin{tcolorbox}A box again\end{tcolorbox}
\end{tcbraster}
\end{dispExample}
\end{docEnvironment}


\clearpage

\begin{docEnvironment}[doc new=2014-11-10]{tcbitemize}{\oarg{options}}
This is a special case of a \refEnv{tcbraster} with the given \meta{options}.
\begin{itemize}
\item Here, the enclosed boxes are created using \refCom{tcbitem}.
\item There has to be at least one \refCom{tcbitem}.
\item One cannot use anything else than \refCom{tcbitem} to add something
  to the \emph{raster}.
\end{itemize}
This leads to a very compact syntax.

\begin{dispExample}
\begin{tcbitemize}[raster columns=2, raster equal height=rows,
  size=small,colframe=red!50!black,colback=red!10!white,colbacktitle=red!50!white,
  title={Box \# \thetcbrasternum}]
  \tcbitem First box
  \tcbitem Second box
  \tcbitem This is a box\\with a second line
  \tcbitem[colback=yellow,colbacktitle=yellow!50!black] Another box
  \tcbitem A box again
\end{tcbitemize}
\end{dispExample}

\bigskip

\begin{marker}
\refEnv{tcbitemize} has more restrictions than \refEnv{tcbraster}.
Especially, the \refKey{/tcb/capture} mode has to be \docValue{minipage}.
For example, \refKey{/tcb/fit} cannot be used safely.
If \refKey{/tcb/fit} should be used, turn over to \refEnv{tcbraster}.
\end{marker}
\end{docEnvironment}


\begin{docCommand}[doc new=2014-11-10]{tcbitem}{\oarg{options}}
  Used inside \refEnv{tcbitemize} to create a new \refEnv{tcolorbox}
  with the given \meta{options}.
\end{docCommand}


\clearpage
\subsection{Option Keys of the Library}\label{subsec:raster_options}

\begin{docTcbKey}[][doc new=2014-11-10]{raster columns}{=\meta{number}}{no default, initially |2|}
  Sets the \meta{number} of columns for a \emph{raster}.
\begin{dispExample}
\begin{tcbitemize}[raster columns=3,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\begin{tcbitemize}[raster columns=4,
  size=small,colframe=blue!50!black,colback=blue!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}

\begin{docTcbKey}[][doc new=2014-11-10]{raster rows}{=\meta{number}}{no default, initially |2|}
  Sets the \meta{number} of rows for a \emph{raster}.
  Note that this is only relevant in connection with setting \refKey{/tcb/raster height}
  to a value greater than |0pt|. Then, it defines the number of rows \emph{per} given
  height.
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster width}{=\meta{length}}{no default, initially \cs{linewidth}}
  Sets the total raster width to the given \meta{length}.
  \refKey{/tcb/raster left skip} and \refKey{/tcb/raster right skip} are part
  of the total width.
\begin{dispExample}
\begin{tcbitemize}[raster width=\linewidth/2,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\clearpage
\begin{docTcbKey}[][doc new=2014-11-10]{raster height}{=\meta{length}}{no default, initially |0pt|}
  Sets the raster height \emph{per} \refKey{/tcb/raster rows} to the given \meta{length}.
  This forces an appropriate height for the enclosed boxes.
  \refKey{/tcb/raster before skip} and \refKey{/tcb/raster after skip}
  are not part of this calculation.
  If the \meta{length} is set to |0pt|, this feature is deactivated.
\begin{dispExample}
\begin{tcbitemize}[raster height=4cm, raster rows=2,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem[enhanced,
    finish={\draw[blue,very thick,<->] (frame.south)
      -- node[right,pos=.75]{4cm} +(0,4); }]
    Three
  \tcbitem Four
  \tcbitem Five
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\begin{docTcbKey}[][doc new and updated={2014-11-10}{2014-12-16}]{raster before skip}{=\meta{glue}}{no default, initially |2mm|}
  Space of the given \meta{glue} is inserted vertically before the \emph{raster}.
  This space is discardable.
\end{docTcbKey}

\begin{docTcbKey}[][doc new and updated={2014-11-10}{2014-12-16}]{raster after skip}{=\meta{glue}}{no default, initially |2mm|}
  Space of the given \meta{glue} is inserted vertically after the \emph{raster}.
  This space is discardable.
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2015-01-08]{raster equal skip}{=\meta{length}}{style, no default}
  Shortcut to set
  \refKey{/tcb/raster before skip},
  \refKey{/tcb/raster after skip},
  \refKey{/tcb/raster column skip}, and
  \refKey{/tcb/raster row skip}
  to the same \meta{length} value.
\begin{dispExample}
\begin{tcbitemize}[raster equal skip=4mm,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\clearpage

\begin{docTcbKey}[][doc new=2014-11-10]{raster left skip}{=\meta{length}}{no default, initially |0pt|}
  Space of the given \meta{length} is inserted horizontally left of the \emph{raster}.
\begin{dispExample}
\begin{tcbitemize}[raster left skip=2cm,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster right skip}{=\meta{length}}{no default, initially |0pt|}
  Space of the given \meta{length} is inserted horizontally right of the \emph{raster}.
\begin{dispExample}
\begin{tcbitemize}[raster right skip=2cm,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}

\enlargethispage*{1cm}

\begin{docTcbKey}[][doc new=2014-11-10]{raster column skip}{=\meta{length}}{no default, initially |2mm|}
 Space of the given \meta{length} is inserted horizontally between the columns.
\begin{dispExample}
\begin{tcbitemize}[raster column skip=2cm,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}

\begin{docTcbKey}[][doc new=2014-11-10]{raster row skip}{=\meta{length}}{no default, initially |2mm|}
 Space of the given \meta{length} is inserted vertically between the rows.
\begin{dispExample}
\begin{tcbitemize}[raster row skip=0pt,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}

\clearpage

\begin{docTcbKey}[][doc new=2014-11-10]{raster halign}{=\meta{alignment}}{no default, initially \docValue{left}}
  Defines the horizontal alignment for the boxes of the rows of a \emph{raster},
  if these rows are not completely filled (mainly: the last one).

  Feasible values for \meta{alignment} are:
  \begin{itemize}
  \item\docValue{left}: align to the left side,
  \item\docValue{center}: align to the center,
  \item\docValue{right}: align to the right side.
  \end{itemize}

\begin{dispExample}
\begin{tcbitemize}[raster halign=center,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster valign}{=\meta{alignment}}{no default, initially \docValue{center}}
  Defines the vertical alignment for the boxes of a row,
  if the boxes do not have equal height. This sets the
  \refKey{/tcb/box align} option.

  Feasible values for \meta{alignment} are:
  \begin{itemize}
  \item\docValue{top}: align to the top side,
  \item\docValue{center}: align to the center,
  \item\docValue{bottom}: align to the bottom side.
  \end{itemize}

\begin{dispExample}
\begin{tcbitemize}[raster valign=top, raster columns=3,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem \Huge One
  \tcbitem \Large Two
  \tcbitem Three
\end{tcbitemize}
\begin{tcbitemize}[raster valign=center, raster columns=3,
  size=small,colframe=blue!50!black,colback=blue!10!white]
  \tcbitem \Huge One
  \tcbitem \Large Two
  \tcbitem Three
\end{tcbitemize}
\begin{tcbitemize}[raster valign=bottom, raster columns=3,
  size=small,colframe=green!50!black,colback=green!10!white]
  \tcbitem \Huge One
  \tcbitem \Large Two
  \tcbitem Three
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\clearpage
\begin{docTcbKey}[][doc new=2014-11-10]{raster equal height}{=\meta{type}}{default \docValue{all}, initially \docValue{none}}
  Puts the enclosed boxes into a common \refKey{/tcb/equal height group}.
  The \meta{id} of the equal height group is chosen automatically, but
  it may be set manually by \refKey{/tcb/raster equal height group}.

  Feasible values for \meta{type} are:
  \begin{itemize}
  \item\docValue{none}: no equal height setting,
  \item\docValue{rows}: all boxes in a row are set to equal height,
  \item\docValue{all}: all boxes in the raster are set to equal height.
  \end{itemize}
  Note that you have to compile twice to see changes.

\begin{dispExample}
\begin{tcbitemize}[raster equal height=rows,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem \Huge Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\begin{dispExample}
\begin{tcbitemize}[raster equal height,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem \Huge Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster equal height group}{=\meta{id}}{no default}
  Overwrites the automatically chosen id with the given \meta{id}.
  If this is used to share a common height between the \emph{raster} and
  another raster or box, the \refKey{/tcb/raster equal height} option
  should be set to \docValue{all}.
\begin{dispExample}
\tcbset{size=small,colframe=red!50!black,colback=red!10!white}
\begin{tcolorbox}[equal height group=raster-manual-id]
  A single box
\end{tcolorbox}
\begin{tcbitemize}[raster equal height,raster equal height group=raster-manual-id]
  \tcbitem One
  \tcbitem \Huge Two
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\clearpage

\begin{docTcbKey}[][doc new=2014-11-10]{raster force size}{\colOpt{=true\textbar false}}{default |true|, initially |true|}
  Enforces the raster size computations onto the enclosed boxes.
  If set to \docValue{false}, individual settings can be used (for the better or worse).
\begin{dispExample}
\begin{tcbitemize}[raster force size=false, raster halign=center,
  size=small,colframe=red!50!black,colback=red!10!white]
  \tcbitem One
  \tcbitem Two
  \tcbitem[add to width=-3cm] Three
  \tcbitem[add to width=-3cm] Four
  \tcbitem[add to width=-3cm] Five
  \tcbitem[add to width=3cm] Six
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}



\begin{docTcbKey}[][doc new=2014-11-10]{raster reset}{}{no value}
  Sets all raster settings back to their default values.
  Note that \refKey{/tcb/reset} does not execute this option.
  Style settings like \refKey{/tcb/raster odd column} etc. are not
  touched by \refKey{/tcb/raster reset}.
\end{docTcbKey}



\subsection{Adding Styles for Specific Boxes}\label{subsec:raster_styles}

The following styles can be defined to address certain boxes inside
a \emph{raster}. Note that such style definitions are not removed by
\refKey{/tcb/reset} or \refKey{/tcb/raster reset}.
The style definitions are used in the order given below.

\begin{docTcbKey}[][doc new=2014-11-24]{raster every box}{}{style}
This style is used for every box.
\end{docTcbKey}

\begin{docTcbKey}[][doc new=2014-11-10]{raster odd column}{}{style}
This style is used for every box in an odd column.
\begin{dispExample}
\begin{tcbitemize}[size=small,colframe=red!50!black,colback=red!10!white,
  raster odd column/.style={colframe=blue!50!black,colback=blue!10!white}]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}

\begin{docTcbKey}[][doc new=2014-11-10]{raster even column}{}{style}
This style is used for every box in an even column.
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster column n}{}{style}
This style is used for every box in the |n|-th column.
|n| has to be replaced by a number.
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster odd row}{}{style}
This style is used for every box in an odd row.
\end{docTcbKey}

\begin{docTcbKey}[][doc new=2014-11-10]{raster even row}{}{style}
This style is used for every box in an even row.
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster row m}{}{style}
This style is used for every box in the |m|-th row.
|m| has to be replaced by a number.
\begin{dispExample}
\begin{tcbitemize}[size=small,colframe=red!50!black,colback=red!10!white,
  raster row 2/.style={colframe=blue!50!black,colback=blue!10!white}]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}

\begin{docTcbKey}[][doc new=2014-11-10]{raster odd number}{}{style}
This style is used for every box with an odd number.
\end{docTcbKey}

\begin{docTcbKey}[][doc new=2014-11-10]{raster even number}{}{style}
This style is used for every box with an even number.
\begin{dispExample}
\begin{tcbitemize}[size=small,colframe=red!50!black,colback=red!10!white,
  raster columns=3,
  raster even number/.style={colframe=blue!50!black,colback=blue!10!white}]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
  \tcbitem Five
  \tcbitem Six
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster row m column n}{}{style}
This style is used for the box in the
|m|-th row and |n|-th column.
|m| and |n| have to be replaced by numbers.
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2014-11-10]{raster number n}{}{style}
This style is used for the box with number |n|.
|n| has to be replaced by a number.
\begin{dispExample}
\begin{tcbitemize}[size=small,colframe=red!50!black,colback=red!10!white,
  raster number 4/.style={colframe=blue!50!black,colback=blue!10!white}]
  \tcbitem One
  \tcbitem Two
  \tcbitem Three
  \tcbitem Four
\end{tcbitemize}
\end{dispExample}
\end{docTcbKey}