Succesfully initalize openGL context on the opengl_widget

CONTRIBUTING.md

@@ -66,3 +66,14 @@ The imports must be organized as follows:
 # Modules local to the current module last
 ```
 
+Additionally, each imported module will be alphabetized by the module name
+inside of the `import X` (X being the module name) or the `from X import Y`
+(X being the module name).
+
+If you are importing more than one thing from a module, alphabetize those as well
+
+`from x import foo, bar, baz`
+
+should be
+
+`from x import bar, baz, foo`.

clusterview/opengl_widget.py

@@ -0,0 +1,21 @@
+"""
+This module defines functions that need to be overwritten
+in order for OpenGL to work with the main window. This
+module is named the same as the actual widget in order
+to make namespacing consistent.
+
+To be clear, the actual widget is defined in the UI
+generated code - `clusterview_ui.py`. The functions
+here are imported as overrides to the OpenGL functions of
+that widget.
+"""
+
+from OpenGL.GL import glClearColor, glEnable
+
+def initialize_gl():
+    """
+    Initializes the OpenGL context on the Window.
+    """
+
+    # Set white background
+    glClearColor(255, 255, 255, 0)

main_window.py

@@ -5,9 +5,10 @@ from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QCursor
 from PyQt5 import QtWidgets, uic
 
-from clusterview_ui import Ui_MainWindow
 from clusterview.exceptions import handle_exceptions, InvalidMode
 from clusterview.mode import Mode, MODE_MAP
+from clusterview.opengl_widget import initialize_gl
+from clusterview_ui import Ui_MainWindow
 
 class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
     """
@@ -22,6 +23,12 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         super(MainWindow, self).__init__(parent)
         self.setupUi(self)
 
+        #-----------------------------------------------
+        # OpenGL Graphics Handlers are set
+        # here and defined in clusterview.opengl_widget.
+        #-----------------------------------------------
+        self.opengl_widget.initializeGL = initialize_gl
+
         # -------------------------------------
         # UI Handlers
         # -------------------------------------