Contents of Arrows

Arrows

The command for drawing arrows is drawarrow. The syntax is similar to the command:

\drawarrow[<direction><configuration>]
          (<(x,y) co-ordinates of the arrow>)

An arrowhead is produced at the specified (x,y) co-ordinates, generally at the end or middle of a line. The direction is one of the usual compass point directions:

             \N   \NE   \E   \SE   \S   \SW   \W   \NW

If LDIR or LINEDIRECTION is used instead then the direction of the last drawn line will automatically be used (pre-supposing that a line has been drawn in the current picture). If the previous line was drawn by the command (see next chapter) then the initially specified vertex direction will be used. The configuration is one of the following:

                  \ATTIP                 \ATBASE

These specify whether the co-ordinates which you've input refer to the position of the base of the arrow or the tip of the arrow. Arrows may be drawn boldly if thicklines is in operation. The length of an arrow is given by the variable arrowlength. When an arrow is attached to the end of a line the particlelengthx,y are not altered (and neither is gluonlengthx ) however the variables boxlengthx and boxlengthy, mentioned in subsection 2.10.2, assume a different meaning now. The tip of the arrow will always have co-ordinates ( boxlengthx, boxlengthy), whether it is drawn with ATTIP or ATBASE. The following examples should illustrate these features.

\documentstyle [12pt]{article}
\input FEYNMAN
\begin {document}
\bigphotons
\centerline{ARROWS using FEYNMAN.TEX}
\begin{picture}(10000,10000)(0,0)             % PICTURE 1
\drawline\fermion[\NE\REG](0,0)[8000] 
\drawarrow[\LDIR\ATTIP](\pmidx,\pmidy)
\drawline\fermion[\E\REG](\fermionbackx,\fermionbacky)[2000]
\drawline\fermion[\N\REG](\fermionfrontx,\fermionfronty)[2000]
\drawline\fermion[\W\REG](0,0)[2000]
\drawline\fermion[\S\REG](0,0)[2000]
\drawarrow[\S\ATBASE](0,-2000)
\drawarrow[\W\ATBASE](-2000,0)
\end{picture}
\hskip -0.4in
\begin{picture}(10000,10000)(0,0)             % PICTURE 2
\drawline\fermion[\SW\REG](0,0)[8000] 
\thicklines
\drawarrow[\SW\ATTIP](\pbackx,\pbacky)
\thinlines
\drawline\fermion[\W\REG](\fermionbackx,\fermionbacky)[2000]
\drawline\fermion[\S\REG](\fermionfrontx,\fermionfronty)[2000]
\drawline\fermion[\E\REG](0,0)[2000]
\drawline\fermion[\N\REG](0,0)[2000]
\drawarrow[\E\ATBASE](2000,0)
\drawarrow[\N\ATBASE](0,2000)
\end{picture}
\hskip -0.4in
\begin{picture}(10000,10000)(0,0)             % PICTURE 3 
\drawline\scalar[\SW\REG](0,0)[6] 
\drawarrow[\SW\ATTIP](\pbackx,\pbacky)
\drawline\fermion[\E\REG](0,0)[2000]
\drawline\fermion[\N\REG](0,0)[2000]
\drawarrow[\E\ATBASE](2000,0)
\drawarrow[\E\ATTIP](2000,0)
\drawarrow[\N\ATBASE](0,2000)
\drawarrow[\N\ATTIP](0,2000)
\drawline\fermion[\W\REG](\scalarbackx,\scalarbacky)[2000]
\drawline\fermion[\S\REG](\scalarbackx,\scalarbacky)[2000]
\drawarrow[\E\ATTIP](\scalarbackx,\scalarbacky)
\drawarrow[\N\ATTIP](\scalarbackx,\scalarbacky)
\end{picture}
\begin{picture}(10000,10000)(0,0)             % PICTURE 4 
\thicklines
\drawline\fermion[\NW\REG](0,0)[8000] 
\drawline\fermion[\W\REG](\fermionbackx,\fermionbacky)[2000]
\drawline\fermion[\N\REG](\fermionfrontx,\fermionfronty)[2000]
\drawarrow[\NW\ATBASE](-1000,1000)
\drawarrow[\NW\ATBASE](-2000,2000)
\drawarrow[\NW\ATBASE](-3000,3000)
\drawarrow[\NW\ATTIP](-4000,4000)
\drawarrow[\NW\ATTIP](-5000,5000)
\drawline\fermion[\E\REG](0,0)[2000]
\drawline\fermion[\S\REG](0,0)[2000]
\end{picture}
\begin{picture}(10000,10000)(0,0)             % PICTURE 5 
\drawline\photon[\E\REG](0,0)[8]
\drawline\fermion[\E\REG](\pbackx,\pbacky)[200]
\drawarrow[\E\ATBASE](\pbackx,\pbacky)
\drawline\fermion[\SW\REG](0,0)[2000]
\drawline\fermion[\NW\REG](0,0)[2000]
\end{picture}
\vskip 0.5in
\begin{picture}(10000,10000)(0,0)             % PICTURE 6 
\drawline\gluon[\E\REG](0,0)[8]
\drawarrow[\E\ATBASE](\pbackx,\pbacky)
\drawline\fermion[\SW\REG](0,0)[2000]
\drawline\fermion[\NW\REG](0,0)[2000]
\end{picture}
\hskip 0.42in
\begin{picture}(10000,10000)(0,0)             % PICTURE 7 
\drawline\photon[\SE\REG](0,0)[8] 
\drawarrow[\E\ATBASE](\pmidx,\pmidy)
\drawarrow[\E\ATBASE](\pbackx,\pbacky)
\drawline\fermion[\W\REG](0,0)[2000]
\drawline\fermion[\N\REG](0,0)[2000]
\end{picture}
\begin{picture}(10000,10000)(0,0)             % PICTURE 8 
\drawline\gluon[\SE\REG](0,0)[7] 
\drawarrow[\E\ATTIP](\pmidx,\pmidy)
\drawarrow[\S\ATBASE](\pbackx,\pbacky)
\drawline\fermion[\W\REG](0,0)[2000]
\drawline\fermion[\N\REG](0,0)[2000]
\end{picture}

giving

ARROWS using FEYNMAN.TEX

$\begin{picture}(10000,10000)(0,0) \drawline\fermion[\NE\REG](0,0)[8000] \drawar... ...000] \drawarrow[\S\ATBASE](0,-2000) \drawarrow[\W\ATBASE](-2000,0) \end{picture}$

$\begin{picture}(10000,10000)(0,0) \drawline\fermion[\SW\REG](0,0)[8000]\thick... ...ze 2}} \drawarrow[\E\ATBASE](2000,0) \drawarrow[\N\ATBASE](0,2000) \end{picture}$

$\begin{picture}(10000,10000)(0,0) \drawline\scalar[\SW\REG](0,0)[6] \drawarrow[... ...ackx,\scalarbacky) \drawarrow[\N\ATTIP](\scalarbackx,\scalarbacky) \end{picture}$

$\begin{picture}(10000,10000)(0,0)\thicklines \drawline\fermion[\NW\REG](0,0)[... ...ne\fermion[\E\REG](0,0)[2000] \drawline\fermion[\S\REG](0,0)[2000] \end{picture}$

$\begin{picture}(10000,10000)(0,0) \drawline\photon[\E\REG](0,0)[8] \global\advan... ...\fermion[\SW\REG](0,0)[2000] \drawline\fermion[\NW\REG](0,0)[2000] \end{picture}$

$\begin{picture}(10000,10000)(0,0) \drawline\gluon[\E\REG](0,0)[8] \global\advanc... ...\fermion[\SW\REG](0,0)[2000] \drawline\fermion[\NW\REG](0,0)[2000] \end{picture}$

$\begin{picture}(10000,10000)(0,0) \drawline\photon[\SE\REG](0,0)[8] \drawarrow[... ...ne\fermion[\W\REG](0,0)[2000] \drawline\fermion[\N\REG](0,0)[2000] \end{picture}$

$\begin{picture}(10000,10000)(0,0) \drawline\gluon[\SE\REG](0,0)[7] \drawarrow[\... ...ne\fermion[\W\REG](0,0)[2000] \drawline\fermion[\N\REG](0,0)[2000] \end{picture}$