BUG #1947: isofill does not handle out of bounds levels correctly.

When smallest level is bigger than min scalar value or biggest level
is smaller than max scalar value isofill creates the wrong image.

Packages/vcs/vcs/vcsvtk/isofillpipeline.py

@@ -67,7 +67,17 @@ def _plotInternal(self):
                     lut.SetTableValue(j, 1., 1., 1., 0.)
             luts.append([lut, [0, len(l) - 1, True]])
             mapper.SetLookupTable(lut)
-            mapper.SetScalarRange(0, len(l) - 1)
+            minRange = 0
+            maxRange = len(l) - 1
+            if (i == 0 and self._scalarRange[0] < l[0]):
+                # band 0 is from self._scalarRange[0] to l[0]
+                # we don't show band 0
+                minRange += 1
+            if (i == len(tmpLevels) - 1 and self._scalarRange[1] > l[-1]):
+                # band len(l) - 1 is from l[-1] to self._scalarRange[1]
+                # we don't show band len(l) - 1
+                maxRange -= 1
+            mapper.SetScalarRange(minRange, maxRange)
             mapper.SetScalarModeToUseCellData()
             mappers.append(mapper)