Better schedule, including plotting

• plot_schedule method that plots the schedule
• forward_slack and backward_slack
• Execution times supported
• Slightly different graph_id that more often do not change the previous
• scipy is now a dependency for drawing splines

Close #35 (closed)

b_asic/operation.py

@@ -248,13 +248,6 @@ class Operation(GraphComponent, SignalSourceProvider):
         """
         raise NotImplementedError
 
-    @abstractmethod
-    def set_execution_time(self, latency: int) -> None:
-        """Sets the execution time of the operation to the specified integer
-        value. The execution time cannot be a negative integer.
-        """
-        raise NotImplementedError
-
     @property
     @abstractmethod
     def execution_time(self) -> int:
@@ -263,6 +256,14 @@ class Operation(GraphComponent, SignalSourceProvider):
         """
         raise NotImplementedError
 
+    @execution_time.setter
+    @abstractmethod
+    def execution_time(self, latency: int) -> None:
+        """Sets the execution time of the operation to the specified integer
+        value. The execution time cannot be a negative integer.
+        """
+        raise NotImplementedError
+
     @abstractmethod
     def get_plot_coordinates(self) -> Tuple[List[List[Number]], List[List[Number]]]:
         """Get a tuple constaining coordinates for the two polygons outlining
@@ -556,6 +557,7 @@ class AbstractOperation(Operation, AbstractGraphComponent):
             new_component.input(i).latency_offset = inp.latency_offset
         for i, outp in enumerate(self.outputs):
             new_component.output(i).latency_offset = outp.latency_offset
+        new_component.execution_time = self._execution_time
         return new_component
 
     def inputs_required_for_output(self, output_index: int) -> Iterable[int]:
@@ -654,8 +656,9 @@ class AbstractOperation(Operation, AbstractGraphComponent):
             raise ValueError("No execution time specified.")
         return self._execution_time
 
-    def set_execution_time(self, execution_time: int) -> None:
-        assert execution_time >= 0, "Negative execution time entered."
+    @execution_time.setter
+    def execution_time(self, execution_time: int) -> None:
+        assert execution_time is None or execution_time >= 0 , "Negative execution time entered."
         self._execution_time = execution_time
 
     def get_plot_coordinates(self) -> Tuple[List[List[Number]], List[List[Number]]]: