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<H2><A NAME="SECTION00411000000000000000">
2.1.1 Specifying pen attributes</A>
</H2>
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<P>
A pen in <A NAME="tex2html170"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> has three attributes: <I>width</I>, <I>color</I>,
and <I>texture</I>. Most programs will accept pen attributes in
the form of an option argument, e.g.,
<P>
<BR>
<P>
<B>-W</B><I>width</I>[/<I>color</I>][<B>t</B><I>texture</I>][<B>p</B>]
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<DT><STRONG><IMG
WIDTH="20" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img46.gif"
ALT="$\rightarrow$"></STRONG></DT>
<DD><I>Width</I> is normally measured in units of the
current device resolution (i.e., DOTS_PR_INCH in your
<U>.gmtdefaults</U> file). Thus, if the dpi is set to 300 this unit
is 1/300th of an inch. Append <B>p</B> to specify pen width in points
(1/72 of an inch)<A NAME="tex2html169"
HREF="footnode.html#foot940"><SUP>2.1</SUP></A>.
Note that a pen thickness of 5 will be of different
physical width depending on your dpi setting, whereas a thickness of
5<B>p</B> will always be 5/72 of an inch. Minimum-thickness pens can be
achieved by giving zero width, but the result is device-dependent.
<P>
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<DT><STRONG><IMG
WIDTH="20" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img46.gif"
ALT="$\rightarrow$"></STRONG></DT>
<DD>The <I>color</I> can be specified as a <I>gray</I>
shade in the range 0-255 (linearly going from black to white) or using
the RGB system where you specify <I>r</I>/<I>g</I>/<I>b</I>, each ranging
from 0-255. Here 0/0/0 is black and 255/255/255 is white.
<P>
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<A NAME="951"></A>
<A NAME="952"></A></DD>
<DT><STRONG><IMG
WIDTH="20" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img46.gif"
ALT="$\rightarrow$"></STRONG></DT>
<DD>The <I>texture</I> attribute controls the appearance
of the line. To get a dotted line, simply append ``<B>t</B>o'' after the
width and color arguments; a dashed pen is requested with ``<B>t</B>a''.
For exact specifications you may append ``<B>t</B><I>string</I>:<I>offset</I>'',
where <I>string</I> is a series of integers separated by underscores.
These numbers represent a pattern by indicating the length of line
segments and the gap between segments. The <I>offset</I> phase-shifts the
pattern along the line. For example, if you want a yellow line of width
2 that alternates between long dashes (20 units), a 10 unit gap, then
a 5 unit dash, then another 10 unit gap, with pattern offset by 10 units
from the origin, specify <B>-W</B>2/255/255/0<B>t</B>20_10_5_10:10.
Here, the texture units can be specified in dpi units or points (see above).
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<ADDRESS>
Paul Wessel
2001-04-18
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