New module: Show

A module for gathering code related to visibility automation and the like.

Contains DepGraphTools.py and TempoVis.py, to be withdrawn from
Part/AttachmentEditor.

Also: changes to TempoVis:
* keep TempoVis from from raising
(TempoVis is non-essential functionality, so breaking execution of
unsuspecting routines that use it seems like a bad idea.

* implement saving/restoring camera
(Unfortunately, I failed to implement nice animated restoration.)

* almost proper support of saving to file
(I still couldn't figure out a way to restore reference to document and
viewer. So, falling to using active ones instead (might cause bugs).)

src/Mod/Show/DepGraphTools.py

@@ -0,0 +1,82 @@
+#/***************************************************************************
+# *   Copyright (c) Victor Titov (DeepSOIC)                                 *
+# *                                           (vv.titov@gmail.com) 2016     *
+# *                                                                         *
+# *   This file is part of the FreeCAD CAx development system.              *
+# *                                                                         *
+# *   This library is free software; you can redistribute it and/or         *
+# *   modify it under the terms of the GNU Library General Public           *
+# *   License as published by the Free Software Foundation; either          *
+# *   version 2 of the License, or (at your option) any later version.      *
+# *                                                                         *
+# *   This library  is distributed in the hope that it will be useful,      *
+# *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+# *   GNU Library General Public License for more details.                  *
+# *                                                                         *
+# *   You should have received a copy of the GNU Library General Public     *
+# *   License along with this library; see the file COPYING.LIB. If not,    *
+# *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+# *   Suite 330, Boston, MA  02111-1307, USA                                *
+# *                                                                         *
+# ***************************************************************************/
+
+import FreeCAD as App
+
+def getAllDependencies(feat):
+    '''getAllDependencies(feat): gets all features feat depends on, directly or indirectly. 
+    Returns a list, with deepest dependencies last. feat is not included in the list, except 
+    if the feature depends on itself (dependency loop).'''
+    list_traversing_now = [feat]
+    set_of_deps = set()
+    list_of_deps = []
+    
+    while len(list_traversing_now) > 0:
+        list_to_be_traversed_next = []
+        for feat in list_traversing_now:
+            for dep in feat.OutList:
+                if not (dep in set_of_deps):
+                    set_of_deps.add(dep)
+                    list_of_deps.append(dep)
+                    list_to_be_traversed_next.append(dep)
+        
+        list_traversing_now = list_to_be_traversed_next
+    
+    return list_of_deps
+
+def getAllDependent(feat):
+    '''getAllDependent(feat): gets all features that depend on feat, directly or indirectly. 
+    Returns a list, with deepest dependencies last. feat is not included in the list, except 
+    if the feature depends on itself (dependency loop).'''
+    list_traversing_now = [feat]
+    set_of_deps = set()
+    list_of_deps = []
+    
+    while len(list_traversing_now) > 0:
+        list_to_be_traversed_next = []
+        for feat in list_traversing_now:
+            for dep in feat.InList:
+                if not (dep in set_of_deps):
+                    set_of_deps.add(dep)
+                    list_of_deps.append(dep)
+                    list_to_be_traversed_next.append(dep)
+        
+        list_traversing_now = list_to_be_traversed_next
+    
+    return list_of_deps
+
+def isContainer(obj):
+    '''isContainer(obj): returns True if obj is an object container, such as 
+    Group, Part, Body. The important characterisic of an object being a 
+    container is its action on visibility of linked objects. E.g. a 
+    Part::Compound is not a group, because it does not affect visibility 
+    of originals. Documents are considered containers, too.'''
+    
+    if obj.isDerivedFrom("App::DocumentObjectGroup"):
+        return True
+    if obj.isDerivedFrom("PartDesign::Body"):
+        return True
+    if obj.isDerivedFrom("App::Origin"):
+        return True
+    if obj.isDerivedFrom('App::Document'):
+        return True