From 6bfdd4e2f54e7a42a41b53705479a53cce26fe0d Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Sun, 24 Feb 2019 22:09:44 +1100
Subject: [PATCH] Support copying subelements

---
 src/Mod/Draft/Draft.py      | 14 ++++++++++++++
 src/Mod/Draft/DraftTools.py | 22 +++++++++++++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Draft/Draft.py b/src/Mod/Draft/Draft.py
index 1bace3522a..dd1ccddcbc 100644
--- a/src/Mod/Draft/Draft.py
+++ b/src/Mod/Draft/Draft.py
@@ -1500,6 +1500,20 @@ def moveEdge(object, edge_index, vector):
     else:
         moveVertex(object, edge_index+1, object.Placement.multVec(object.Points[edge_index+1]), vector)
 
+def copyEdges(copy_edge_arguments):
+    copied_edges = []
+    for argument in copy_edge_arguments:
+        copied_edges.append(copyEdge(argument[0], argument[1], argument[2]))
+    joinWires(copied_edges)
+
+def copyEdge(object, edge_index, vector):
+    vertex1 = object.Placement.multVec(object.Points[edge_index]).add(vector)
+    if isClosedEdge(edge_index, object):
+        vertex2 = object.Placement.multVec(object.Points[0]).add(vector)
+    else:
+        vertex2 = object.Placement.multVec(object.Points[edge_index+1]).add(vector)
+    return makeLine(vertex1, vertex2)
+
 def isClosedEdge(edge_index, object):
     return edge_index + 1 >= len(object.Points)
 
diff --git a/src/Mod/Draft/DraftTools.py b/src/Mod/Draft/DraftTools.py
index 59d67f18f0..ec03ec286d 100644
--- a/src/Mod/Draft/DraftTools.py
+++ b/src/Mod/Draft/DraftTools.py
@@ -2667,10 +2667,30 @@ class Move(Modifier):
 
     def move_subelements(self):
         try:
-            self.commit(translate("draft", "Move"), self.build_move_subelements_command())
+            if self.ui.isCopy.isChecked():
+                self.commit(translate("draft", "Copy"), self.build_copy_subelements_command())
+            else:
+                self.commit(translate("draft", "Move"), self.build_move_subelements_command())
         except:
             FreeCAD.Console.PrintError(translate("draft", "Some subelements could not be moved."))
 
+    def build_copy_subelements_command(self):
+        import Part
+        command = []
+        copy_edge_arguments = []
+        for object in self.selected_subelements:
+            for index, subelement in enumerate(object.SubObjects):
+                if not isinstance(subelement, Part.Edge):
+                    continue
+                copy_edge_arguments.append('[FreeCAD.ActiveDocument.{}, {}, {}]'.format(
+                    object.ObjectName,
+                    int(object.SubElementNames[index][len("Edge"):])-1,
+                    DraftVecUtils.toString(self.vector)
+                    ))
+        command.append('Draft.copyEdges([{}])'.format(','.join(copy_edge_arguments)))
+        command.append('FreeCAD.ActiveDocument.recompute()')
+        return command
+
     def build_move_subelements_command(self):
         import Part
         command = []