From 63200c00e568b1d35ba941ecd7b714775bd553d2 Mon Sep 17 00:00:00 2001
From: Markus Lampert <markus@bibi.ca>
Date: Mon, 11 Jun 2018 22:45:07 -0700
Subject: [PATCH] Offsetting edges for chamfer op.

---
 src/Mod/Path/PathScripts/PathChamfer.py | 57 ++++++++++++++++++++++++-
 src/Mod/Path/PathScripts/PathEngrave.py | 10 +++--
 2 files changed, 61 insertions(+), 6 deletions(-)

diff --git a/src/Mod/Path/PathScripts/PathChamfer.py b/src/Mod/Path/PathScripts/PathChamfer.py
index 40c3c41d47..e764667a5c 100644
--- a/src/Mod/Path/PathScripts/PathChamfer.py
+++ b/src/Mod/Path/PathScripts/PathChamfer.py
@@ -25,12 +25,14 @@
 import FreeCAD
 import Part
 import Path
+import PathScripts.PathEngrave as PathEngrave
 import PathScripts.PathLog as PathLog
 import PathScripts.PathOp as PathOp
+import math
 
 from PySide import QtCore
 
-if False:
+if True:
     PathLog.setLevel(PathLog.Level.DEBUG, PathLog.thisModule())
     PathLog.trackModule(PathLog.thisModule())
 else:
@@ -51,7 +53,58 @@ class ObjectChamfer(PathOp.ObjectOp):
         obj.addProperty("App::PropertyDistance", "ExtraDepth", "Chamfer", QtCore.QT_TRANSLATE_NOOP("PathChamfer", "The additional depth of the tool path"))
 
     def opExecute(self, obj):
-        pass
+        angle = self.tool.CuttingEdgeAngle
+        if 0 == angle:
+            angle = 180
+        tan = math.tan(math.radians(angle/2))
+        toolDepth = 0 if 0 == tan else obj.Width.Value / tan
+        extraDepth = obj.ExtraDepth.Value
+        depth = toolDepth + extraDepth
+        toolOffset = self.tool.FlatRadius
+        extraOffset = self.tool.Diameter/2 - obj.Width.Value if 180 == angle else obj.ExtraDepth.Value / tan
+        offset = toolOffset + extraOffset
+        PathLog.debug("%s  depth(%.2f, %.2f)  offset(%.2f, %.2f)" % (obj.Label, toolDepth, extraDepth, toolOffset, extraOffset))
+
+        wires = []
+        for base, subs in obj.Base:
+            edges = []
+            basewires = []
+            for f in subs:
+                sub = base.Shape.getElement(f)
+                if type(sub) == Part.Edge:
+                    edges.append(sub)
+                elif sub.Wires:
+                    basewires.extend(sub.Wires)
+                else:
+                    basewires.append(Part.Wire(sub.Edges))
+            for edgelist in Part.sortEdges(edges):
+                basewires.append(Part.Wire(edgelist))
+
+            for w in PathEngrave.adjustWirePlacement(obj, base, basewires):
+                wires.append(self.offsetWire(w, base, offset))
+        self.wires = wires
+
+    def offsetWire(self, wire, base, offset):
+        def removeInsideEdges(edges):
+            def isInside(edge):
+                for v in edge.Vertexes:
+                    if base.Shape.isInside(v.Point, offset/2, True):
+                        return True
+                return False
+            result = []
+            return [e for e in edges if not isInside(e)]
+
+        w = wire.makeOffset2D(offset)
+        if wire.isClosed():
+            if not base.Shape.isInside(w.Edges[0].Vertexes[0].Point, offset/2, True):
+                return w
+            return wire.makeOffset2D(-offset)
+        edges = removeInsideEdges(w.Edges)
+        if edges:
+            return Part.Wire(edges)
+        w = wire.makeOffset2D(-offset)
+        edges = removeInsideEdges(w.Edges)
+        return Part.Wire(edges)
 
     def opSetDefaultValues(self, obj):
         obj.Width = '1 mm'
diff --git a/src/Mod/Path/PathScripts/PathEngrave.py b/src/Mod/Path/PathScripts/PathEngrave.py
index eb78985441..b6b1976ba1 100644
--- a/src/Mod/Path/PathScripts/PathEngrave.py
+++ b/src/Mod/Path/PathScripts/PathEngrave.py
@@ -155,18 +155,20 @@ class ObjectEngrave(PathOp.ObjectOp):
                     #    edges.extend(base.Shape.getElement(sub).Edges)
                     #shapeWires = adjustWirePlacement(obj, base, TechDraw.edgeWalker(edges))
                     #wires.extend(shapeWires)
+                    basewires = []
                     for feature in subs:
                         sub = base.Shape.getElement(feature)
                         if type(sub) == Part.Edge:
                             edges.append(sub)
                         elif sub.Wires:
-                            wires.extend(sub.Wires)
+                            basewires.extend(sub.Wires)
                         else:
-                            wires.append(Part.Wire(sub.Edges))
+                            basewires.append(Part.Wire(sub.Edges))
 
                     for edgelist in Part.sortEdges(edges):
-                        wires.append(Part.Wire(edgelist))
-                wires = adjustWirePlacement(obj, base, wires)
+                        basewires.append(Part.Wire(edgelist))
+
+                    wires.extend(adjustWirePlacement(obj, base, basewires))
                 self.buildpathocc(obj, wires, zValues)
                 self.wires = wires
             elif not obj.BaseShapes: