added is_scalable to compas.robots.Joint

Author: romanarust

src/compas/robots/model/joint.py

@@ -317,11 +317,15 @@ def calculate_transformation(self, position):
     def is_configurable(self):
         """Returns ``True`` if the joint can be configured, otherwise ``False``."""
         return self.type != Joint.FIXED
+    
+    def is_scalable(self):
+        """Returns ``True`` if the joint can be scaled, otherwise ``False``."""
+        return self.type in [Joint.PLANAR, Joint.PRISMATIC]
 
     def scale(self, factor):
         self.origin.scale(factor)
         self.init_origin.point *= factor
-        if self.type in [Joint.PLANAR, Joint.PRISMATIC]:
+        if self.is_scalable():
             self.limit.scale(factor)