Changes required for printing one at a time

cura/ConvexHullDecorator.py

@@ -5,6 +5,13 @@ class ConvexHullDecorator(SceneNodeDecorator):
     def __init__(self):
         super().__init__()
         self._convex_hull = None
+        
+        # In case of printing all at once this is the same as the convex hull. For one at the time this is the area without the head.
+        self._convex_hull_boundary = None 
+        
+        # In case of printing all at once this is the same as the convex hull. For one at the time this is area with full head
+        self._convex_hull_head = None
+        
         self._convex_hull_node = None
         self._convex_hull_job = None
         settings = Application.getInstance().getActiveMachine()
@@ -23,6 +30,22 @@ class ConvexHullDecorator(SceneNodeDecorator):
     def getConvexHull(self):
         return self._convex_hull
     
+    def getConvexHullHead(self):
+        if not self._convex_hull_head:
+            return self.getConvexHull()
+        return self._convex_hull_head
+    
+    def getConvexHullBoundary(self):
+        if not self._convex_hull_boundary:
+            return self.getConvexHull()
+        return self._convex_hull_boundary
+    
+    def setConvexHullBoundary(self, hull):
+        self._convex_hull_boundary = hull
+        
+    def setConvexHullHead(self, hull):
+        self._convex_hull_head = hull
+    
     def setConvexHull(self, hull):
         self._convex_hull = hull