Change logic for auto-fading connections (#53)

* Add ability to specify additional latex packages

* Change logic for auto fading connections

* Update auto-fade docstring

* Fade horizontal and vertical connection edges based on src/target fading

* Bump version

* Fixing minor version

---------

Co-authored-by: Andrew Lamkin <lamkina@umich.edu>

pyxdsm/XDSM.py

@@ -113,7 +113,7 @@ def _label_to_spec(label, spec):
 System = namedtuple("System", "node_name style label stack faded label_width spec_name")
 Input = namedtuple("Input", "node_name label label_width style stack faded")
 Output = namedtuple("Output", "node_name label label_width style stack faded side")
-Connection = namedtuple("Connection", "src target label label_width style stack faded")
+Connection = namedtuple("Connection", "src target label label_width style stack faded src_faded target_faded")
 Process = namedtuple("Process", "systems arrow faded")
 
 
@@ -130,7 +130,7 @@ def __init__(self, use_sfmath=True, optional_latex_packages=None, auto_fade=None
         auto_fade : dictionary, optional
             Controls the automatic fading of inputs, outputs, connections and processes based on the fading of diagonal blocks. For each key "inputs", "outputs", "connections", and "processes", the value can be one of:
             - "all" : fade all blocks
-            - "connected" : fade all components connected to faded blocks
+            - "connected" : fade all components connected to faded blocks (both source and target must be faded for a conncection to be faded)
             - "none" : do not auto-fade anything
             For connections there are two additional options:
             - "incoming" : Fade all connections that are incoming to faded blocks.
@@ -376,13 +376,13 @@ def connect(
         targetFaded = target in sys_faded and sys_faded[target]
         if (
             allFaded
-            or (self.auto_fade["connections"] == "connected" and (srcFaded or targetFaded))
+            or (self.auto_fade["connections"] == "connected" and (srcFaded and targetFaded))
             or (self.auto_fade["connections"] == "incoming" and targetFaded)
             or (self.auto_fade["connections"] == "outgoing" and srcFaded)
         ):
             faded = True
 
-        self.connections.append(Connection(src, target, label, label_width, style, stack, faded))
+        self.connections.append(Connection(src, target, label, label_width, style, stack, faded, srcFaded, targetFaded))
 
     def add_process(self, systems, arrow=True, faded=False):
         """
@@ -536,12 +536,16 @@ def _build_edges(self):
 
         edge_format_string = "({start}) edge [{style}] ({end})"
         for conn in self.connections:
-            style = "DataLine"
-            if conn.faded:
-                style += ",faded"
+            h_edge_style = "DataLine"
+            v_edge_style = "DataLine"
+            if conn.src_faded or conn.faded:
+                h_edge_style += ",faded"
+            if conn.target_faded or conn.faded:
+                v_edge_style += ",faded"
             od_node_name = "{}-{}".format(conn.src, conn.target)
-            h_edges.append(edge_format_string.format(start=conn.src, end=od_node_name, style=style))
-            v_edges.append(edge_format_string.format(start=od_node_name, end=conn.target, style=style))
+
+            h_edges.append(edge_format_string.format(start=conn.src, end=od_node_name, style=h_edge_style))
+            v_edges.append(edge_format_string.format(start=od_node_name, end=conn.target, style=v_edge_style))
 
         for comp_name, out in self.left_outs.items():
             style = "DataLine"

pyxdsm/__init__.py

@@ -1 +1 @@
-__version__ = "2.2.2"
+__version__ = "2.3.0"