add antialiasing code

SketchWidget.py

@@ -35,6 +35,11 @@ class SketchWidget:
         # GL calls
         if not gldrawable.gl_begin(glcontext): return
 
+#        glEnable(GL_BLEND)
+#        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
+#        glEnable(GL_POLYGON_SMOOTH)
+#        glEnable(GL_LINE_SMOOTH)
+
         gldrawable.gl_end()
 
     def reshape(self, glarea, event):