Resolve "Visualize PG"

Closes #27 (closed)

b_asic/signal_flow_graph.py

@@ -9,6 +9,7 @@ from collections import defaultdict, deque
 from io import StringIO
 from queue import PriorityQueue
 import itertools
+from graphviz import Digraph
 
 from b_asic.port import SignalSourceProvider, OutputPort
 from b_asic.operation import Operation, AbstractOperation, MutableOutputMap, MutableRegisterMap
@@ -577,6 +578,27 @@ class SFG(AbstractOperation):
 
         return precedence_list
 
+    def show_precedence_graph(self) -> None:
+        p_list = self.get_precedence_list()
+        pg = Digraph()
+        pg.attr(rankdir = 'LR')
+
+        # Creates nodes for each output port in the precedence list
+        for i in range(len(p_list)):
+            ports = p_list[i]
+            with pg.subgraph(name='cluster_' + str(i)) as sub:
+                sub.attr(label='N' + str(i + 1))
+                for port in ports:
+                    sub.node(port.operation.graph_id + '.' + str(port.index))
+        # Creates edges for each output port and creates nodes for each operation and edges for them as well
+        for i in range(len(p_list)):
+            ports = p_list[i]
+            for port in ports:
+                for signal in port.signals:
+                    pg.edge(port.operation.graph_id + '.' + str(port.index), signal.destination.operation.graph_id)
+                pg.edge(port.operation.graph_id, port.operation.graph_id + '.' + str(port.index))
+        pg.view()  
+
     def print_precedence_graph(self) -> None:
         """Prints a representation of the SFG's precedence list to the standard out.
         If the precedence list already has been calculated then it uses the cached version,