made blank stuff properties

src/compas_timber/parts/beam.py

@@ -87,8 +87,6 @@ def __init__(self, frame, length, width, height, **kwargs):
         self.length = length
         self.features = []
         self._blank_extensions = {}
-        self.blank_frame = frame
-        self.blank_length = length
 
     @property
     def data(self):
@@ -109,12 +107,20 @@ def from_data(cls, data):
 
     @property
     def blank(self):
-        start, end = self._resolve_blank_extensions()
-        self.blank_frame = self.frame.copy()
-        self.blank_frame.point += -self.blank_frame.xaxis * start  # "extension" to the start edge
-        self.blank_length = self.length + start + end
         return _create_box(self.blank_frame, self.blank_length, self.width, self.height)
 
+    @property
+    def blank_length(self):
+        start, end = self._resolve_blank_extensions()
+        return self.length + start + end
+
+    @property
+    def blank_frame(self):
+        start, _ = self._resolve_blank_extensions()
+        frame = self.frame.copy()
+        frame.point += -frame.xaxis * start  # "extension" to the start edge
+        return frame
+
     @property
     def faces(self):
         return [
@@ -350,16 +356,6 @@ def extension_to_plane(self, pln):
         elif side == "end":
             tmax = max(x.keys())
             de = (tmax - 1.0) * self.length
-
-        # if side == "start":
-        #     tmin = min(x.keys())
-        #     if tmin < 0.0:
-        #         ds = tmin * self.length  # should be negative
-        # elif side == "end":
-        #     tmax = max(x.keys())
-        #     if tmax > 1.0:
-        #         de = (tmax - 1.0) * self.length
-
         return -ds, de
 
     def align_z(self, vector):