From b97bee5eae7fbb7d8ab7bccbed7aa7a7b330d096 Mon Sep 17 00:00:00 2001
From: pi <zhangyiss@icloud.com>
Date: Thu, 3 May 2018 11:47:17 -0700
Subject: [PATCH] add -l option

---
 gmtsph-global.sh | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/gmtsph-global.sh b/gmtsph-global.sh
index e2b27d1..5fb299c 100755
--- a/gmtsph-global.sh
+++ b/gmtsph-global.sh
@@ -11,6 +11,7 @@ overwriteRange='null'
 overwrite=0
 labels=("longitude (degree)" "latitude (degree)")
 plotgrad=0
+clon=0
 # 从命令行获取参数
 while getopts "hi:r:u:c:a:g" arg
 do
@@ -18,9 +19,10 @@ do
 		h)
 			printf "simple global wide data mapping using GMT script. The template accepts a grid (.nc .grid) file as input and outputs a .png and a .eps file. \
 For futher explanations, please look for GMT's manuscripts.\nAuthor: Yi Zhang (zhangyi.cugwuhan@gmail.com)\n" 
-			printf "usage: ${0##*/} -i<grid-data> [-r<xmin>/<xmax>/<ymin>/<ymax>] [-u<unit>] [-c<cpt-file>] [-a<x-label>,<y-label>] [-g]\n"
+			printf "usage: ${0##*/} -i<grid-data> [-r<xmin>/<xmax>/<ymin>/<ymax>] [-l<lon>] [-u<unit>] [-c<cpt-file>] [-a<x-label>,<y-label>] [-g]\n"
 			printf "%s\t%s\n" "-i" "input grid file"
 			printf "%s\t%s\n" "-r" "data range. The template will ditect the input data range automaticly, the use of this option will overwrite the range."
+			printf "%s\t%s\n" "-l" "central longitude value of the plot, the default value is 0"
 			printf "%s\t%s\n" "-u" "data unit. The default is meter."
 			printf "%s\t%s\n" "-c" "color cpt. The default is rainbow."
 			printf "%s\t%s\n" "-a" "axis labels. The deafults are x (m) and y (m)."
@@ -35,6 +37,8 @@ For futher explanations, please look for GMT's manuscripts.\nAuthor: Yi Zhang (z
 		r)
 			overwrite=1
 			overwriteRange=$OPTARG;;
+		l)
+			clon=$OPTARG;;
 		a)
 			labels=(${OPTARG//,/ });;
 		g)
@@ -75,9 +79,9 @@ else
 	if [[ $plotgrad == 1 ]]; then
 		gradfile=usergradient.nc
 		gmt grdgradient ${data} -G${gradfile} -Nt -A0/45
-		gmt grdimage ${data} -R${range} -C${cptfile} -I${gradfile} -Bxag+l"${labels[0]}" -Bpya40g40+l"${labels[1]}" -JN180/3i -K -P > $psfile
+		gmt grdimage ${data} -R${range} -C${cptfile} -I${gradfile} -Bxag+l"${labels[0]}" -Bpya40g40+l"${labels[1]}" -JN${clon}/3i -K -P > $psfile
 	else
-		gmt grdimage ${data} -R${range} -C${cptfile} -Bxag+l"${labels[0]}" -Bpya40g40+l"${labels[1]}" -JN180/3i -K -P > $psfile
+		gmt grdimage ${data} -R${range} -C${cptfile} -Bxag+l"${labels[0]}" -Bpya40g40+l"${labels[1]}" -JN${clon}/3i -K -P > $psfile
 	fi
 	#-C${cptfile}+Uk 使用km（色标单位除1000）
 	gmt psscale -Dx0.5i/-0.3i+w2i/0.07i+h -C${cptfile} -Bxa -By+l${unit} -O >> $psfile