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<H1><A NAME="SECTION0015190000000000000000"></A>
<A NAME="23976"></A>
<A NAME="23977"></A>
<BR>
7.19 Color patterns on maps
</H1>
<P>
<A NAME="tex2html1416"
HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> 3.1 introduced color patterns and this examples give
a few cases of how to use this new feature. We make a phony
poster that advertises an international conference on <A NAME="tex2html1417"
HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> in Honolulu. We use <A NAME="tex2html1418"
HREF="../man/grdmath.html"><I><B>grdmath</B></I></A><A NAME="24843"></A>, <A NAME="tex2html1419"
HREF="../man/makecpt.html"><I><B>makecpt</B></I></A><A NAME="24848"></A>, and
<A NAME="tex2html1420"
HREF="../man/grdimage.html"><I><B>grdimage</B></I></A><A NAME="24853"></A> to draw pleasing color backgrounds on maps,
and overlay <A NAME="tex2html1421"
HREF="../man/pscoast.html"><I><B>pscoast</B></I></A><A NAME="24858"></A> clip paths to have the patterns
change at the coastlines. The middle panel demonstrates a
simple <A NAME="tex2html1422"
HREF="../man/pscoast.html"><I><B>pscoast</B></I></A><A NAME="24863"></A> call where the built-in pattern # 86
is drawn at 100 dpi but with the black and white pixels
replaced with color combinations. At the same time the ocean is filled with a repeating
image of a circuit board (provides in Sun raster format).
The text <A NAME="tex2html1423"
HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> in the center is an off-line <I>PostScript</I> file that was overlaid using <A NAME="tex2html1424"
HREF="../man/psimage.html"><I><B>psimage</B></I></A><A NAME="24872"></A>.
The final panel repeats the top panel except that the land and sea images have changed places
(Figure <A HREF="#fig:GMT_example_19">7.19</A>).
<P>
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<PRE>#!/bin/sh
# GMT EXAMPLE 19
#
# Purpose: Illustrates various color pattern effects for maps
# GMT progs: gmtset, grdimage, grdmath, makecpt, pscoast, pstext, psimage
# Unix progs: rm
#
ps=example_19.ps
# First make a worldmap with graded blue oceans and rainbow continents
gmtset COLOR_MODEL rgb
grdmath -Rd -I1 Y COSD 2 POW = lat.grd
grdmath -Rd -I1 X Y ABS 90 NEQ MUL = lon.grd
echo "0 white 1 blue" > lat.cpt
makecpt -Crainbow -T-180/180/60 -Z > lon.cpt
grdimage lat.grd -Sl -JI0/6.5i -Clat.cpt -P -K -Y7.5i -B0 > $ps
pscoast -R -J -O -K -Dc -A5000 -Gc >> $ps
grdimage lon.grd -Sl -J -Clon.cpt -O -K >> $ps
pscoast -R -J -O -K -Q >> $ps
pscoast -R -J -O -K -Dc -A5000 -Wthinnest >> $ps
echo "0 20 32 0 1 CM 8TH INTERNATIONAL" | pstext -R -J -O -K -Gred -Sthinner >> $ps
echo "0 -10 32 0 1 CM GMT CONFERENCE" | pstext -R -J -O -K -Gred -Sthinner >> $ps
echo "0 -30 18 0 1 CM Honolulu, Hawaii, April 1, 2010" | pstext -R -J -O -K -Ggreen -Sthinnest >> $ps
# Then show example of color patterns and placing a PostScript image
pscoast -R -J -O -K -Dc -A5000 -Gp100/86:FredByellow -Sp100/circuit.ras -B0 -Y-3.25i >> $ps
echo "0 30 32 0 1 CM SILLY USES OF" | pstext -R -J -O -K -Glightgreen -Sthinner >> $ps
echo "0 -30 32 0 1 CM COLOR PATTERNS" | pstext -R -J -O -K -Gmagenta -Sthinner >> $ps
psimage -C3.25i/1.625i/CM -W3i GMT_covertext.eps -O -K >> $ps
# Finally repeat 1st plot but exchange the patterns
grdimage lon.grd -Sl -J -Clon.cpt -O -K -Y-3.25i -B0 -U"Example 19 in Cookbook" >> $ps
pscoast -R -J -O -K -Dc -A5000 -Gc >> $ps
grdimage lat.grd -Sl -J -Clat.cpt -O -K >> $ps
pscoast -R -J -O -K -Q >> $ps
pscoast -R -J -O -K -Dc -A5000 -Wthinnest >> $ps
echo "0 20 32 0 1 CM 8TH INTERNATIONAL" | pstext -R -J -O -K -Gred -Sthinner >> $ps
echo "0 -10 32 0 1 CM GMT CONFERENCE" | pstext -R -J -O -K -Gred -Sthinner >> $ps
echo "0 -30 18 0 1 CM Honolulu, Hawaii, April 1, 2010" | pstext -R -J -O -Ggreen -Sthinnest >> $ps
rm -f l*.grd l*.cpt .gmt*
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_example_19"></A><A NAME="24878"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 7.19:</STRONG>
Using color patterns and additional PostScript material in illustrations.</CAPTION>
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<ADDRESS>
Paul Wessel
2010-01-14
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