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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="arrowschanging" NAME="tex2html267" HREF="node16.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previous.gif"></A><A NAME="tex2html271" HREF="node16.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previoussection.gif"></A><A NAME="tex2html273" HREF="node11.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="up" SRC="./up.gif"></A><A NAME="tex2html269" HREF="node18.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="next" SRC="./nextsection.gif"></A><A NAME="tex2html275" HREF="node18.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="next" SRC="./next.gif"></A></P><H2><A NAME="SECTION00046000000000000000">2.6 Changing the target</A></H2> It is possible to overwrite a target with another by
appending something of the form <code>*</code><em>object</em> to it. This
has the effect of typesetting the <em>object</em> at the current
position, thus effectively on top of the target, and then use what
was typeset as the target.
<P>
A target may also have its position changed by one of the
following constructions:
<UL>
<LI><code>+</code><em>vector</em> or <code>-</code><em>vector</em> which changes the
target to be a zero-sized one at the position obtained by adding or
subtracting the <em>vector</em> to its center, or
<LI><code>!</code><em>vector</em> which moves the center of the target by the
<em>vector</em>;
<P>
</UL>
where a <em>vector</em> should have the form
<UL>
<LI><IMG WIDTH=82 HEIGHT=29 ALIGN=MIDDLE ALT="tex2html_wrap_inline2648" SRC="img48.gif"> , where <IMG WIDTH=60 HEIGHT=29 ALIGN=MIDDLE ALT="tex2html_wrap_inline2650" SRC="img49.gif"> are TeX dimensions, is the
vector with those coordinates,
<LI>the following "corner offsets" of a target are vectors as shown:
<P><CENTER><BR><IMG WIDTH=244 HEIGHT=128 ALIGN=BOTTOM ALT="displaymath740" SRC="img50.gif"><BR></CENTER><P>
(they must be specified in upper case), and
<LI><code>/</code><I>d</I> <em>dimen</em><code>/</code> is the <em>vector</em> going
<em>dimen</em> in the particular direction <I>d</I> which can be either the eight simple ones in
section <A HREF="node9.html#basicsbends">1.6</A>, empty to denote that the
<em>current direction</em> (the last direction of an arrow)
should be used, or one of the following:
<P><CENTER><TABLE BORDER=BASIC CELLPADDING=3 COLS=2><TR><TD> <code>va(</code><IMG WIDTH=12 HEIGHT=10 ALIGN=BOTTOM ALT="tex2html_wrap_inline2656" SRC="img51.gif"><code>)</code> <TD> absolute angle <TR><TD>
<I>d</I><code>:a(</code><IMG WIDTH=12 HEIGHT=10 ALIGN=BOTTOM ALT="tex2html_wrap_inline2656" SRC="img51.gif"><code>)</code> <TD> relative angle in degrees <TR><TD>
<I>d</I><code>:(</code><I>x</I>,<I>y</I><code>)</code> <TD> relative vector <TR><TD>
<I>d</I><code>^</code> / <I>d</I><code>_</code> <TD> short for <code>:a(90)</code> / <code>:a(-90)</code>
</TABLE></CENTER><P>
<P>
where the <I>d</I> in the last four may be empty to denote the "current
direction."
<LI><code>0</code> is the zero vector.
<P>
</UL>
Many, many more possibilities are described in the reference
manual [<A HREF="node34.html#RM95:Xy-picRM">8</A>].
<P>
<A NAME="Exercise11"> </A><H4><A NAME="SECTION00046010000000000000">Exercise 11.</A></H4> What is the difference between a target <I>t</I> and the target <I>t</I><code>+0</code>?
<P>
<A HREF="node33.html#Answer11">Answer.</A>
<P>
<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="tex2html267" HREF="node16.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previous.gif"></A><A NAME="tex2html271" HREF="node16.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="previous" SRC="./previoussection.gif"></A><A NAME="tex2html273" HREF="node11.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="up" SRC="./up.gif"></A><A NAME="tex2html269" HREF="node18.html"><IMG WIDTH=27 HEIGHT=27 BORDER=0 ALIGN=ABSMIDDLE ALT="next" SRC="./nextsection.gif"></A><A NAME="tex2html275" HREF="node18.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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