Add point clearing

clusterview2.ui

@@ -314,6 +314,8 @@
    <addaction name="action_move_points"/>
    <addaction name="action_edit_points"/>
    <addaction name="action_delete_points"/>
+   <addaction name="separator"/>
+   <addaction name="action_clear_canvas"/>
   </widget>
   <action name="action_add_points">
    <property name="text">
@@ -387,6 +389,11 @@
     <string>Generate Random Points</string>
    </property>
   </action>
+  <action name="action_clear_canvas">
+   <property name="text">
+    <string>Clear Canvas</string>
+   </property>
+  </action>
  </widget>
  <resources/>
  <connections/>

clusterview2/points.py

@@ -287,6 +287,9 @@ class PointSet:
         for point in self._points:
             yield point
 
+    def clear_points(self):
+        self._points = []
+
     @property
     def point_size(self):
         return self._point_size

clusterview2_ui.py

@@ -152,6 +152,8 @@ class Ui_MainWindow(object):
         self.action_exit.setObjectName("action_exit")
         self.action_generate_random_points = QtWidgets.QAction(MainWindow)
         self.action_generate_random_points.setObjectName("action_generate_random_points")
+        self.action_clear_canvas = QtWidgets.QAction(MainWindow)
+        self.action_clear_canvas.setObjectName("action_clear_canvas")
         self.menu_file.addAction(self.action_load_point_configuration)
         self.menu_file.addAction(self.action_save_point_configuration)
         self.menu_file.addSeparator()
@@ -163,6 +165,8 @@ class Ui_MainWindow(object):
         self.tool_bar.addAction(self.action_move_points)
         self.tool_bar.addAction(self.action_edit_points)
         self.tool_bar.addAction(self.action_delete_points)
+        self.tool_bar.addSeparator()
+        self.tool_bar.addAction(self.action_clear_canvas)
 
         self.retranslateUi(MainWindow)
         QtCore.QMetaObject.connectSlotsByName(MainWindow)
@@ -199,3 +203,4 @@ class Ui_MainWindow(object):
         self.action_load_point_configuration.setText(_translate("MainWindow", "Load Point Configuration"))
         self.action_exit.setText(_translate("MainWindow", "Exit"))
         self.action_generate_random_points.setText(_translate("MainWindow", "Generate Random Points"))
+        self.action_clear_canvas.setText(_translate("MainWindow", "Clear Canvas"))

main_window.py

@@ -105,6 +105,7 @@ class MainWindow(QMainWindow, Ui_MainWindow):
         self.action_edit_points.triggered.connect(self._edit_points)
         self.action_delete_points.triggered.connect(self._delete_points)
         self.action_move_points.triggered.connect(self._move_points)
+        self.action_clear_canvas.triggered.connect(self._clear_canvas)
 
         (self.action_generate_random_points
             .triggered.connect(self._generate_random_points))
@@ -167,6 +168,11 @@ class MainWindow(QMainWindow, Ui_MainWindow):
         clear_selection()
         self.opengl_widget.update()
 
+    def _clear_canvas(self):
+        PointManager.point_set.clear_points()
+        refresh_point_list(self)
+        self.opengl_widget.update()
+
     def _clustering(self):
         if len(list(PointManager.point_set.points)) == 0:
             error_dialog = QErrorMessage()
@@ -183,7 +189,7 @@ class MainWindow(QMainWindow, Ui_MainWindow):
     def _reset(self):
         self._off_mode()
         self.number_of_clusters.setEnabled(True)
-        self.number_of_clusters.setValue(0)
+        self.number_of_clusters.setValue(4)
         self.clustering_button.setEnabled(False)
         self.clustering_solved = False
         PointManager.clusters = []