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% Copyright 2003 by Till Tantau <tantau@cs.tu-berlin.de>.
%
% This program can be redistributed and/or modified under the terms
% of the LaTeX Project Public License Distributed from CTAN
% archives in directory macros/latex/base/lppl.txt.
\section{Quick Commands}
This section explains the ``quick'' commands of \pgfname. These
commands are executed more quickly than the normal commands of
\pgfname, but offer less functionality. You should use these commands
only if you either have a very large number of commands that need to
be processed or if you expect your commands to be executed very often.
\subsection{Quick Path Construction Commands}
The difference between the quick and the normal path commands is that
the quick path commands
\begin{itemize}
\item
do not keep track of the bounding boxes,
\item
do not allow you to arc corners,
\item
do not apply coordinate transformations.
\end{itemize}
However, they do use the soft-path subsystem (see
Section~\ref{section-soft-paths} for details), which allows you to mix
quick and normal path commands arbitrarily.
All quick path construction commands start with |\pgfpathq|.
\begin{command}{\pgfpathqmoveto\marg{x dimension}\marg{y dimension}}
Either starts a path or starts a new part of a path at the coordinate
$(\meta{x dimension},\meta{y dimension})$. The coordinate is
\emph{not} transformed by the current coordinate transformation
matrix. However, any low-level transformations apply.
\begin{codeexample}[]
\begin{tikzpicture}
\draw[help lines] (0,0) grid (3,2);
\pgftransformxshift{1cm}
\pgfpathqmoveto{0pt}{0pt} % not transformed
\pgfpathqlineto{1cm}{1cm} % not transformed
\pgfpathlineto{\pgfpoint{2cm}{0cm}}
\pgfusepath{stroke}
\end{tikzpicture}
\end{codeexample}
\end{command}
\begin{command}{\pgfpathqlineto\marg{x dimension}\marg{y dimension}}
The quick version of the line-to operation.
\end{command}
\begin{command}{\pgfpathqcurveto\marg{$s^1_x$}\marg{$s^1_y$}\marg{$s^2_x$}\marg{$s^2_y$}\marg{$t_x$}\marg{$t_y$}}
The quick version of the curve-to operation. The first support point
is $(s^1_x,s^1_y)$, the second support point is $(s^2_x,s^2_y)$,
and the target is $(t_x,t_y)$.
\begin{codeexample}[]
\begin{tikzpicture}
\draw[help lines] (0,0) grid (3,2);
\pgfpathqmoveto{0pt}{0pt}
\pgfpathqcurveto{1cm}{1cm}{2cm}{1cm}{3cm}{0cm}
\pgfusepath{stroke}
\end{tikzpicture}
\end{codeexample}
\end{command}
\begin{command}{\pgfpathqcircle\marg{radius}}
Adds a radius around the origin of the given \meta{radius}. This
command is orders of magnitude faster than
|\pgfcircle{\pgfpointorigin}{|\meta{radius}|}|.
\begin{codeexample}[]
\begin{tikzpicture}
\draw[help lines] (0,0) grid (1,1);
\pgfpathqcircle{10pt}
\pgfsetfillcolor{examplefill}
\pgfusepath{stroke,fill}
\end{tikzpicture}
\end{codeexample}
\end{command}
\subsection{Quick Path Usage Commands}
The quick path usage commands perform similar tasks as |\pgfusepath|,
but they
\begin{itemize}
\item
do not add arrows,
\item
do not modify the path in any way, in particular,
\item
ends are not shortened,
\item
corners are not replaced by arcs.
\end{itemize}
Note that you \emph{have to} use the quick versions in the code of
arrow tip definitions since, inside these definition, you obviously do
not want arrows to be drawn.
\begin{command}{\pgfusepathqstroke}
Strokes the path without further ado. No arrows are drawn, no
corners are arced.
\begin{codeexample}[]
\begin{pgfpicture}
\pgfpathqcircle{5pt}
\pgfusepathqstroke
\end{pgfpicture}
\end{codeexample}
\end{command}
\begin{command}{\pgfusepathqfill}
Fills the path without further ado.
\end{command}
\begin{command}{\pgfusepathqfillstroke}
Fills and then strokes the path without further ado.
\end{command}
\begin{command}{\pgfusepathqclip}
Clips all subsequent drawings against the current path. The path is
not processed.
\end{command}
\subsection{Quick Text Box Commands}
\begin{command}{\pgfqbox\marg{box number}}
This command inserts a \TeX\ box into a |{pgfpicture}| by
``escaping'' to \TeX, inserting the box number \meta{box number} at
the origin, and then returning to the typesetting the picture.
\end{command}
\begin{command}{\pgfqboxsynced\marg{box number}}
This command works similarly to the |\pgfqbox| command. However,
before inserting the text in \meta{box number}, the current
coordinate transformation matrix is applied to the current canvas
transformation matrix (is it ``synced'' with this matrix, hence the
name).
Thus, this command basically has the same effect as if you first
called |\pgflowlevelsynccm| followed by |\pgfqbox|. However, this
command will use |\hskip| and |\raise| commands for the
``translational part'' of the coordinate transformation matrix,
instead of adding the translational part to the current
canvas transformation matrix directly. Both methods have the same
effect (box \meta{box number} is translated where it should), but
the method used by |\pgfqboxsynced| ensures that hyperlinks are
placed correctly. Note that scaling and rotation will not (cannot,
even) apply to hyperlinks.
\end{command}
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