Fix problem with text transparency

tests/test_vcs_text_transparency.py

@@ -0,0 +1,24 @@
+import basevcstest
+import vcs
+
+class VCSTestTextTransparency(basevcstest.VCSBaseTest):
+    def testTransparentText(self):
+        fa = self.x.createfillarea()
+        fa.x = [.4,.6,.6,.4]
+        fa.y = [.4,.4,.6,.6]
+        fa.color="red"
+
+        self.x.plot(fa)
+
+        txt = self.x.createtext()
+        txt.string = "TRANSPARENT STRING"
+        txt.angle = -45
+        txt.x = .5
+        txt.y = .5
+        txt.halign="center"
+        txt.valign = "half"
+        txt.color = [0, 0, 100, 30]
+        txt.height = 35
+        self.x.plot(txt)
+
+        self.checkImage("test_vcs_text_transparency.png")

vcs/vcs2vtk.py

@@ -1331,7 +1331,7 @@ def prepTextProperty(p, winSize, to="default", tt="default", cmap=None,
     else:
         c = colorIndex
     p.SetColor([C / 100. for C in c[:3]])
-    p.SetOpacity(c[-1])
+    p.SetOpacity(c[-1] / 100.)
     bcolorIndex = tt.backgroundcolor if tt.backgroundcolor else 255
     if isinstance(bcolorIndex, int):
         bc = cmap.index[bcolorIndex]