add bounding box to BaseConduit

Author: juney-lee

src/compas_rhino/conduits/base.py

@@ -25,6 +25,7 @@ class BaseConduit(Rhino.Display.DisplayConduit):
     def __init__(self, refreshrate=1):
         super(BaseConduit, self).__init__()
         self.refreshrate = refreshrate
+        self._boundingbox = None
 
     @contextmanager
     def enabled(self):
@@ -36,6 +37,17 @@ def enabled(self):
         finally:
             self.disable()
 
+    @property
+    def boundingbox(self):
+        if self.boundgbox is None:
+            boundingbox = self.CalculateBoundingBox()
+            self._boundingbox = boundingbox
+        return self._boundingbox
+
+    def CalculateBoundingBox(self, e):
+        bbox = Rhino.Geometry.BoundingBox(-1000, -1000, -1000, 1000, 1000, 1000)
+        e.IncludeBoundingBox(bbox)
+
     def enable(self):
         """Enable the conduit."""
         self.Enabled = True