Add test for issue #1106: Continents are off.

The fix for this issue is at 658ac44.

testing/vcs/CMakeLists.txt

@@ -291,6 +291,12 @@ cdat_add_test(vcs_test_taylor_2_quads
     ${cdat_SOURCE_DIR}/testing/vcs/test_vcs_canvas_background_update.py
     "${BASELINE_DIR}/test_canvas_background_update.png"
     )
+  cdat_add_test(vcs_test_boxfill_decreasing_latitude
+    "${PYTHON_EXECUTABLE}"
+    ${cdat_SOURCE_DIR}/testing/vcs/test_boxfill_decreasing_latitude.py
+    "${BASELINE_DIR}/test_vcs_boxfill_decreasing_latitude.png"
+    "${UVCDAT_GIT_TESTDATA_DIR}/data/decreasing_latitude.nc"
+    )
   cdat_add_test(vcs_test_boxfill_10x10_numpy
     "${PYTHON_EXECUTABLE}"
     ${cdat_SOURCE_DIR}/testing/vcs/test_boxfill_10x10_numpy.py

testing/vcs/test_boxfill_decreasing_latitude.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+import cdms2
+import cdutil
+import os
+import sys
+import vcs
+
+pth = os.path.join(os.path.dirname(__file__),"..")
+sys.path.append(pth)
+import checkimage
+
+f=cdms2.open(sys.argv[2])
+ice = f("variable_6")
+x=vcs.init()
+
+#gm = x.createisofill()
+#gm.label = "y"
+gm = x.createboxfill()
+gm.boxfill_type="custom"
+
+tmpl = x.createtemplate()
+#tmpl.blank()
+tmpl.data.priority=1
+tmpl.data.x1=.05
+tmpl.data.x2=.95
+tmpl.data.y1=.05
+tmpl.data.y2=.90
+tmpl.title.priority=1
+tmpl.box2.priority=1
+tmpl.box2.x1=.23
+tmpl.box2.x2=.815
+tmpl.box2.y1=.11
+tmpl.box2.y2=.895
+tmpl.title.x=.5
+tmpl.title.y=.95
+
+tmpl.legend.priority=1
+tmpl.legend.x1=tmpl.box2.x1-.05
+tmpl.legend.x2=tmpl.box2.x2+.05
+tmpl.legend.y1=.03
+tmpl.legend.y2=.055
+tmpl.max.priority=1
+
+#tmpl.crdate.priority=1
+#tmpl.crdate.x=.8
+#tmpl.crdate.y=.95
+txt = x.createtext()
+txt.height = 20
+#txt.color=242
+txt.valign="half"
+txt.halign = "center"
+
+tmpl.title.textorientation=txt.To_name
+tmpl.title.texttable=txt.Tt_name
+
+ice.long_name = "September sea ice fraction: 4xCO2 climate, no ocean albedo alteration "
+levs = vcs.mkscale(ice.min(),ice.max())
+
+cols=vcs.getcolors(levs)
+cols[0]=240
+
+gm.levels= levs
+gm.fillareacolors = cols
+#gm.projection="polar"
+gm.datawc_y2=30
+gm.datawc_y1=90
+
+x.plot(ice,gm,tmpl,bg=1)
+fnm = "test_boxfill_decreasing_latitude.png"
+x.png(fnm)
+ret = checkimage.check_result_image(fnm,sys.argv[1],checkimage.defaultThreshold)
+sys.exit(ret)
+