I am done

rl/Lib/site-packages/sympy/plotting/pygletplot/plot_object.py

@@ -0,0 +1,17 @@
+class PlotObject:
+    """
+    Base class for objects which can be displayed in
+    a Plot.
+    """
+    visible = True
+
+    def _draw(self):
+        if self.visible:
+            self.draw()
+
+    def draw(self):
+        """
+        OpenGL rendering code for the plot object.
+        Override in base class.
+        """
+        pass