From 4bb609d123e876e9f0683cce2eea62949f3a7a6a Mon Sep 17 00:00:00 2001
From: sliptonic <shopinthewoods@gmail.com>
Date: Fri, 30 Oct 2020 15:57:40 -0500
Subject: [PATCH] dxf post

---
 src/Mod/Path/PathScripts/post/dxf_post.py | 137 ++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 src/Mod/Path/PathScripts/post/dxf_post.py

diff --git a/src/Mod/Path/PathScripts/post/dxf_post.py b/src/Mod/Path/PathScripts/post/dxf_post.py
new file mode 100644
index 0000000000..ee2198803c
--- /dev/null
+++ b/src/Mod/Path/PathScripts/post/dxf_post.py
@@ -0,0 +1,137 @@
+# ***************************************************************************
+# *   Copyright (c) 2020 sliptonic <shopinghewoods@gmail.com>               *
+# *                                                                         *
+# *   This file is part of the FreeCAD CAx development system.              *
+# *                                                                         *
+# *   This program is free software; you can redistribute it and/or modify  *
+# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
+# *   as published by the Free Software Foundation; either version 2 of     *
+# *   the License, or (at your option) any later version.                   *
+# *   for detail see the LICENCE text file.                                 *
+# *                                                                         *
+# *   FreeCAD 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 Lesser General Public License for more details.                   *
+# *                                                                         *
+# *   You should have received a copy of the GNU Library General Public     *
+# *   License along with FreeCAD; if not, write to the Free Software        *
+# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+# *   USA                                                                   *
+# *                                                                         *
+# ***************************************************************************/
+from __future__ import print_function
+import FreeCAD
+# from FreeCAD import Units
+import datetime
+# import PathScripts
+# import PathScripts.PostUtils as PostUtils
+import PathScripts.PathGeom as PathGeom
+import Part
+# import Draft
+import importDXF
+import Path
+
+TOOLTIP = '''
+This is a postprocessor file for the Path workbench. It is used to
+take a pseudo-gcode fragment outputted by a Path object, and output
+a dxf file.
+Operations are output to layers.
+vertical moves are ignore
+All path moves are flattened to z=0
+
+Does NOT remove redundant lines.  If you have multiple step-downs in your
+operation, you'll get multiple redundant lines in your dxf.
+
+import dxf_post
+'''
+
+TOOLTIP_ARGS = '''
+Arguments for dxf:
+'''
+now = datetime.datetime.now()
+
+# # These globals set common customization preferences
+OUTPUT_HEADER = True
+
+
+# to distinguish python built-in open function from the one declared below
+if open.__module__ in ['__builtin__', 'io']:
+    pythonopen = open
+
+
+def processArguments(argstring):
+    pass
+    # global OUTPUT_HEADER
+
+
+def export(objectslist, filename, argstring):
+    doc = FreeCAD.ActiveDocument
+    print("postprocessing...")
+    layers = []
+    processArguments(argstring)
+    for i in objectslist:
+        result = parse(i)
+        if len(result) > 0:
+            layername = i.Name
+            grp = doc.addObject("App::DocumentObjectGroup", layername)
+            for o in result:
+                o.adjustRelativeLinks(grp)
+                grp.addObject(o)
+            layers.append(grp)
+
+    dxfWrite(layers, filename)
+
+
+def dxfWrite(objlist, filename):
+    importDXF.export(objlist, filename)
+
+
+def parse(pathobj):
+    ''' accepts a Path object.  Returns a list of wires'''
+
+    feedcommands = ['G01', 'G1', 'G2', 'G3', 'G02', 'G03']
+    rapidcommands = ['G0', 'G00']
+
+    edges = []
+    objlist = []
+
+    # Gotta start somewhere.  Assume 0,0,0
+    curPoint = FreeCAD.Vector(0, 0, 0)
+    for c in pathobj.Path.Commands:
+        if 'Z' in c.Parameters:
+            newparams = c.Parameters
+            newparams.pop('Z', None)
+            flatcommand = Path.Command(c.Name, newparams)
+            c.Parameters = newparams
+        else:
+            flatcommand = c
+
+        # ignore gcode that isn't moving
+        if flatcommand.Name not in feedcommands + rapidcommands:
+                continue
+
+        # ignore pure vertical feed and rapid
+        if (flatcommand.Parameters.get('X', curPoint.x) == curPoint.x and
+                flatcommand.Parameters.get('Y ', curPoint.y) == curPoint.y):
+                continue
+
+        # feeding move.  Build an edge
+        if flatcommand.Name in feedcommands:
+                edges.append(PathGeom.edgeForCmd(flatcommand, curPoint))
+
+        # update the curpoint
+        curPoint.x = flatcommand.Parameters['X']
+        curPoint.y = flatcommand.Parameters['Y']
+
+    if len(edges) > 0:
+            candidates = Part.sortEdges(edges)
+            for c in candidates:
+                obj = FreeCAD.ActiveDocument.addObject("Part::Feature", "Wire")
+                obj.Shape = Part.Wire(c)
+                objlist.append(obj)
+
+    return objlist
+
+
+print(__name__ + " gcode postprocessor loaded.")