fix #969

Packages/vcs/Lib/vcs2vtk.py

@@ -1120,7 +1120,7 @@ def prepMarker(renWin,marker,cmap=None):
       # Use the difference in x to scale the point, as later we'll use the
       # x range to correct the aspect ratio:
       dx = marker.worldcoordinate[1] - marker.worldcoordinate[0]
-      s *= float(dx)/500.
+      s *= abs(float(dx))/500.
     gs.SetScale(s)
     gs.Update()
 

testing/vcs/CMakeLists.txt

@@ -209,6 +209,12 @@ add_test(vcs_test_taylor_2_quads
     ${cdat_SOURCE_DIR}/testing/vcs/test_1D_with_manyDs.py
     "${BASELINE_DIR}/test_1D_with_manyDs.png"
     )
+  add_test(vcs_test_1d_marker_not_shown_if_xaxis_flipped
+    ${CMAKE_INSTALL_PREFIX}/bin/python
+    ${cdat_SOURCE_DIR}/testing/vcs/test_1d_marker_not_shown_if_xaxis_flipped.py
+    ${BASELINE_DIR}/test_1d_marker_not_shown_if_xaxis_flipped.png
+    )
+
 
   # These test actually plot things need sample data
   if (CDAT_DOWNLOAD_SAMPLE_DATA)

testing/vcs/test_1d_marker_not_shown_if_xaxis_flipped.py

@@ -0,0 +1,41 @@
+import vcs
+import numpy
+import MV2
+import cdms2
+import sys
+import os
+
+src=sys.argv[1]
+pth = os.path.join(os.path.dirname(__file__),"..")
+sys.path.append(pth)
+import checkimage
+
+x=vcs.init()
+x.drawlogooff()
+x.setbgoutputdimensions(1200,1091,units="pixels")
+
+data = MV2.array([4,5,6,7,1,3,7,9,])+230.
+
+p = cdms2.createAxis([2,5,100,200,500,800,850,1000])
+
+data.setAxis(0,p)
+
+data.id="jim"
+
+gm=x.create1d()
+
+gm.linewidth=0
+gm.datawc_x1=1000
+gm.datawc_x2=0
+
+gm.markersize=30
+
+x.plot(data,gm,bg=1)
+
+fnm = "test_1d_marker_not_shown_if_xaxis_flipped.png"
+x.png(fnm)
+
+print "fnm:",fnm
+print "src:",src
+ret = checkimage.check_result_image(fnm,src,checkimage.defaultThreshold)
+sys.exit(ret)