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<TITLE>2.2 Plotting text strings</TITLE>
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<H1><A NAME="SECTION00420000000000000000">
2.2 Plotting text strings</A>
</H1>
<P>
In many situations we need to annotate plots or maps with text strings;
in <A NAME="tex2html187"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> this is done using <A NAME="tex2html188"
HREF="../pstext.html"><I><B>pstext</B></I></A><A NAME="2772"></A>. Apart from the common
switches, there are 7 options that are particularly useful (Table <A HREF="node56.html#tbl:pstext">2.4</A>).
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="1731"></A>
<TABLE>
<CAPTION><STRONG>Table 2.4:</STRONG>
Some of the most frequently used options in <A NAME="tex2html178"
HREF="../pstext.html"><I><B>pstext</B></I></A><A NAME="2790"></A></CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1">
<I>Option</I></FONT></TD>
<TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1"> <I>Purpose</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-C</B></FONT><FONT SIZE="-1"><I>dx</I>/</FONT><FONT SIZE="-1"><I>dy</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Spacing between text and the text box (see </FONT><FONT SIZE="-1"><B>-W</B>) </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-D</B></FONT><FONT SIZE="-1"><I>dx</I>/</FONT><FONT SIZE="-1"><I>dy</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Offsets the projected location of the strings </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-G</B></FONT><FONT SIZE="-1"><I>fill</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Sets the color of the text </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-L</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Lists the font ids and exits </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-N</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Deactivates clipping at the borders </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-S</B></FONT><FONT SIZE="-1"><I>pen</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Selects outline font and sets pen attributes </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-W</B>[</FONT><FONT SIZE="-1"><I>fill</I>][</FONT><FONT SIZE="-1"><B>o</B>[</FONT><FONT SIZE="-1"><I>pen</I>]] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Paint the text box; draw the outline if </FONT><FONT SIZE="-1"><B>o</B> is appended (also see </FONT><FONT SIZE="-1"><B>-C</B>) </FONT></TD>
</TR>
</TABLE><FONT SIZE="-1">
<A NAME="tbl:pstext"></A></FONT></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>
<P>
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_pstext_clearance"></A><A NAME="2799"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 2.1:</STRONG>
Relationship between the text box and the extra clearance</CAPTION>
<TR><TD><IMG
WIDTH="204" HEIGHT="82" BORDER="0"
SRC="img49.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_pstext_clearance.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
The input data to <A NAME="tex2html189"
HREF="../pstext.html"><I><B>pstext</B></I></A><A NAME="2804"></A> is expected to contain the following
information:
<BR><A NAME="1732"></A>
<P>
<I>x y size angle fontno justify text</I>
<BR>
<P>
The <I>size</I> argument is the font size in points, the <I>angle</I> is the
angle (measured counterclockwise) between the text's baseline and the
horizontal, <I>justify</I> indicates which point on the text-string should
correspond to the given <I>x, y</I> location, and <I>text</I> is the text
string or sentence to plot. Figure <A HREF="node56.html#fig:GMT_pstext_justify">2.2</A> illustrates these concepts and shows
the relevant two-character codes used for justification.
<A NAME="1098"></A>
<A NAME="1099"></A>
<P>
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_pstext_justify"></A><A NAME="2822"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 2.2:</STRONG>
Justification (and corresponding character codes) for text strings</CAPTION>
<TR><TD><IMG
WIDTH="241" HEIGHT="80" BORDER="0"
SRC="img50.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_pstext_justify.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
The text string can be one or several words and may include octal codes for
special characters and escape-sequences used to select subscripts or symbol
fonts. The following escape sequences are recognized:
<A NAME="1102"></A>
<A NAME="1103"></A>
<A NAME="1104"></A>
<A NAME="1105"></A>
<A NAME="1106"></A>
<A NAME="1107"></A>
<A NAME="1108"></A>
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="1120"></A>
<TABLE>
<CAPTION><STRONG>Table 2.5:</STRONG>
<A NAME="tex2html184"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> text escape sequences</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1">
<I>Code</I></FONT></TD>
<TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1"> <I>Effect</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@~</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Turns symbol font on or off </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@%</FONT><FONT SIZE="-1"><I>fontno</I>% </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Switches to another font; @%% resets to previous font </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@+ </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Turns superscript on or off </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@- </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Turns subscript on or off </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@# </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Turns small caps on or off </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@! </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Creates one composite character of the next two characters </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@@ </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Prints the @ sign itself </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@E @e </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Æ æ</FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@O @o </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Ø ø</FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
@A @a </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Å å</FONT></TD>
</TR>
</TABLE><FONT SIZE="-1">
<A NAME="tbl:escape"></A></FONT></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>
<P>
Note that these escape sequences (as well as octal codes) can be
used anywhere in <A NAME="tex2html190"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> including as arguments to the <B>-B</B> option.
A chart of octal codes can be found in Appendix F in the <A NAME="tex2html191"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> technical reference book. For accented European characters you must
set WANT_EURO_FONT to TRUE in your <U>.gmtdefaults</U> file.
<P>
We will demonstrate pstext with the following script:
<P>
<PRE>
cat << EOF | pstext -R0/7/0/7 -JX7i -P -B1g1 -G255/128/0 | ghostview -
1 1 30 0 4 BL Its P@al, not Pal!
1 2 30 0 4 BL Try @%33%ZapfChancery@%% today
1 3 30 0 4 BL @~D@~g@-b@- = 2@~pr@~G@~D@~h.
1 4 30 0 4 BL University of Hawaii at M@!a\305noa
EOF
</PRE>
<P>
<A NAME="1127"></A>
<P>
Here we have used the ``here document'' notation in <I>UNIX</I>: The <IMG
WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img8.gif"
ALT="$<$"><IMG
WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img8.gif"
ALT="$<$"> EOF
will treat the following lines as the input file until it detects the
word EOF. We pipe the <I>PostScript</I> directly through <I>ghostview</I><A NAME="2839"></A> (the - tells
<I>ghostview</I><A NAME="2844"></A> that piping is happening).
<P>
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<ADDRESS>
Paul Wessel
2001-04-18
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