Backport PR #10935: FIX: Postscript allow empty markers

jkseppan · MeeseeksDev[bot] · commit 833b7c6e170a · 2018-04-01T17:28:34.000Z
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -526,11 +526,12 @@ def draw_markers(
 
         if rgbFace:
             if len(rgbFace) == 4 and rgbFace[3] == 0:
-                return
-            if rgbFace[0] == rgbFace[1] == rgbFace[2]:
-                ps_color = '%1.3f setgray' % rgbFace[0]
+                ps_color = None
             else:
-                ps_color = '%1.3f %1.3f %1.3f setrgbcolor' % rgbFace[:3]
+                if rgbFace[0] == rgbFace[1] == rgbFace[2]:
+                    ps_color = '%1.3f setgray' % rgbFace[0]
+                else:
+                    ps_color = '%1.3f %1.3f %1.3f setrgbcolor' % rgbFace[:3]
 
         # construct the generic marker command:
         ps_cmd = ['/o {', 'gsave', 'newpath', 'translate'] # don't want the translate to be global
@@ -550,7 +551,8 @@ def draw_markers(
         if rgbFace:
             if stroke:
                 ps_cmd.append('gsave')
-            ps_cmd.extend([ps_color, 'fill'])
+            if ps_color:
+                ps_cmd.extend([ps_color, 'fill'])
             if stroke:
                 ps_cmd.append('grestore')
 
