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<P ALIGN=RIGHT><FONT SIZE=1>Xy-pic User's Guide</FONT> <A HREF="18pt.html"><IMG SRC="./quest.gif" ALIGN=TOP HEIGHT=27 WIDTH=21 BORDER=0 ALT="?"></A><A NAME="arrowsbend" NAME="tex2html291" HREF="node18.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previous.gif"></A><A NAME="tex2html295" HREF="node18.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previoussection.gif"></A><A NAME="tex2html297" HREF="node11.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="up" SRC="./up.gif"></A><A NAME="tex2html293" HREF="node20.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="next" SRC="./nextsection.gif"></A><A NAME="tex2html299" HREF="node20.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="next" SRC="./next.gif"></A></P><H2><A NAME="SECTION00048000000000000000">2.8 More bending arrows</A></H2> Finally, arrows can bend around entries: just insert
<code>`</code><IMG WIDTH=21 HEIGHT=15 ALIGN=BOTTOM ALT="tex2html_wrap_inline2688" SRC="img54.gif">, <I>i.e.</I>, a backquote and a direction <I>d</I> followed by
a target <I>t</I>, for each "turn" that starts out in the
<I>d</I>-direction and ends in a quarter turn towards the
target <I>t</I>. This is different from the curving described
earlier in that all turns consist of a straight part ending in a turn
which is a multiple of 18 circle segments, and each
segment allows separate labels.
<P>
The possible directions are those of section <A HREF="node9.html#basicsbends">1.6</A> and
<A HREF="node17.html#arrowschanging">2.6</A>, and the possible targets include all those
discussed above. Actually the direction is only required for the
first in a series of turns since the final direction of one turn is
the obvious choice for the following turn. Furthermore, turns can be
changed from the default by adding either <code>^</code><I>d</I> for
anticlockwise turn to <I>d</I> or <code>_</code><I>d</I> for clockwise turn to <I>d</I>,
where <I>d</I> is the "exit direction" of the turn.
<P>
Finally, the turns will have radius 10pt by default, but this
can be changed to any dimension <I>R</I> from a particular turn and
onwards by inserting <code>/</code><I>R</I> immediately after the <code>"</code> of the
turn. Here is an example involving all of
these features:
<BLOCKQUOTE><PRE>\xymatrix{
{\circ} \ar `r[d] ^a
`[rr] ^b
`/4pt[rr] ^c
`[rrr] ^d
`_dl[drrr]^e
[drrr]^f
& {\circ} & {\circ} & {\circ} \\
{\circ} & {\circ} & {\circ} & {\circ} }</PRE></BLOCKQUOTE>
<P>
typesets
<P><CENTER><BR><IMG WIDTH=285 HEIGHT=84 ALIGN=BOTTOM ALT="displaymath857" SRC="img55.gif"><BR></CENTER><P>
The example illustrates the following points:
<UL>
<LI>If the segment can not be made as short as required then it will
point `past" the target. This is useful for "going around"
entries.
<LI>There is <em>one <code>`</code> per turn</em> thus each target appears as many
times as there are turns towards it, except the last target that
appears one more time namely both with <code>`</code> for each turn towards it
<em>and</em> once as an "ordinary" target to set the final stretch.
<LI>The sizes of the intermediate targets are ignored.
<P>
</UL>
<P>
<A NAME="Exercise13"> </A><H4><A NAME="SECTION00048010000000000000">Exercise 13.</A></H4> Typeset <IMG WIDTH=82 HEIGHT=50 ALIGN=BOTTOM ALT="tex2html_wrap2716" SRC="img56.gif"> .
<P>
<A HREF="node33.html#Answer13">Answer.</A>
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<P> <P ALIGN=RIGHT><FONT SIZE=1>Xy-pic User's Guide</FONT> <A HREF="18pt.html"><IMG SRC="./quest.gif" ALIGN=TOP HEIGHT=27 WIDTH=21 BORDER=0 ALT="?"></A><A NAME="tex2html291" HREF="node18.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previous.gif"></A><A NAME="tex2html295" HREF="node18.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previoussection.gif"></A><A NAME="tex2html297" HREF="node11.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="up" SRC="./up.gif"></A><A NAME="tex2html293" HREF="node20.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="next" SRC="./nextsection.gif"></A><A NAME="tex2html299" HREF="node20.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="next" SRC="./next.gif"></A><P><ADDRESS>
<BR><HR>
<a href="COPYING/index.html">�/a> <a href="http://www.brics.dk/~krisrose/">Kristoffer H. Rose</a>
<<a href="mailto:[email protected]">[email protected]</a>>
January 6, 1997
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