Add component position convenience method

finesse/tracing/tracesolution.py

@@ -155,6 +155,12 @@ class BaseTraceSolution(metaclass=abc.ABCMeta):
             qys[node] = qy
         return qys
 
+    @property
+    def component_positions(self):
+        return [(comp, self._data[comp]['z'])
+                for comp in self._data['components']
+                if not self._data[comp]['is_space']]
+
     @abc.abstractmethod
     def plot(self, filename=None, show=True, w_scale=SI.MILLI, markers=None):
         raise NotImplementedError