Enable resetting of the cluster solver

clusterview.ui

@@ -159,6 +159,13 @@
            </property>
           </widget>
          </item>
+         <item row="6" column="0">
+          <widget class="QPushButton" name="reset_button">
+           <property name="text">
+            <string>Reset</string>
+           </property>
+          </widget>
+         </item>
         </layout>
        </widget>
       </item>

clusterview/mode_handlers.py

@@ -371,6 +371,18 @@ def group(ctx):
     ctx.opengl_widget.update()
 
 
+def reset_centroid_count_and_colors():
+    global __centroid_count
+    global __remaining_colors
+
+    __centroid_count = 0
+    __remaining_colors = [c for c in Color if
+                          c not in [Color.BLUE, Color.GREY]]
+
+    for point in PointManager.point_set.points:
+        point.color = Color.GREY
+
+
 # Simple dispatcher to make it easy to dispatch the right mode
 # function when the OpenGL window is acted on.
 MODE_HANDLER_MAP = {

clusterview_ui.py

@@ -86,6 +86,9 @@ class Ui_MainWindow(object):
         self.group_button.setEnabled(False)
         self.group_button.setObjectName("group_button")
         self.formLayout.setWidget(4, QtWidgets.QFormLayout.LabelRole, self.group_button)
+        self.reset_button = QtWidgets.QPushButton(self.groupBox_3)
+        self.reset_button.setObjectName("reset_button")
+        self.formLayout.setWidget(6, QtWidgets.QFormLayout.LabelRole, self.reset_button)
         self.verticalLayout.addWidget(self.groupBox_3)
         spacerItem = QtWidgets.QSpacerItem(20, 20, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Fixed)
         self.verticalLayout.addItem(spacerItem)
@@ -171,6 +174,7 @@ class Ui_MainWindow(object):
         self.choose_centroids_button.setText(_translate("MainWindow", "Choose Centroids"))
         self.solve_button.setText(_translate("MainWindow", "Solve"))
         self.group_button.setText(_translate("MainWindow", "Group"))
+        self.reset_button.setText(_translate("MainWindow", "Reset"))
         self.groupBox_2.setTitle(_translate("MainWindow", "Canvas Information"))
         self.label.setText(_translate("MainWindow", "Mouse Position:"))
         self.menu_file.setTitle(_translate("MainWindow", "File"))

main_window.py

@@ -9,7 +9,8 @@ from clusterview.colors import Color
 from clusterview.mode import Mode
 from clusterview.mode_handlers import (group, MODE_HANDLER_MAP,
                                        ogl_keypress_handler,
-                                       refresh_point_list)
+                                       refresh_point_list,
+                                       reset_centroid_count_and_colors)
 from clusterview.opengl_widget import (clear_selection, initialize_gl,
                                        mouse_leave, paint_gl, resize_gl,
                                        set_drawing_context)
@@ -67,8 +68,11 @@ class MainWindow(QMainWindow, Ui_MainWindow):
                                                            self))
 
         self.choose_centroids_button.clicked.connect(self.__choose_centroids)
+
         self.group_button.clicked.connect(self.__group)
 
+        self.reset_button.clicked.connect(self.__reset_grouping)
+
         # -----------------------------------------------
         # OpenGL Graphics Handlers are set
         # here and defined in clusterview.opengl_widget.
@@ -159,6 +163,16 @@ class MainWindow(QMainWindow, Ui_MainWindow):
         self.__off_mode()
         self.opengl_widget.update()
 
+    def __reset_grouping(self):
+        self.__off_mode()
+        self.number_of_centroids.setEnabled(True)
+        self.number_of_centroids.setValue(0)
+        self.choose_centroids_button.setEnabled(True)
+        self.solve_button.setEnabled(False)
+        self.group_button.setEnabled(False)
+        PointManager.centroids = []
+        reset_centroid_count_and_colors()
+
     @property
     def mode(self):
         """