Edge orientation on 2D export

cadquery/occ_impl/exporters/dxf.py

@@ -8,6 +8,7 @@
 from OCP.GeomConvert import GeomConvert
 from OCP.gp import gp_Dir
 from OCP.GC import GC_MakeArcOfEllipse
+from OCP.TopAbs import TopAbs_Orientation
 from typing_extensions import Self
 
 from ...cq import Face, Plane, Workplane
@@ -199,9 +200,17 @@ def _dxf_line(edge: Edge) -> DxfEntityAttributes:
 
         :return: dictionary of DXF entity attributes for creating a line
         """
+
+        if edge.wrapped.Orientation() == TopAbs_Orientation.TopAbs_FORWARD:
+            start = edge.startPoint()
+            end = edge.endPoint()
+        else:
+            start = edge.endPoint()
+            end = edge.startPoint()
+
         return (
             "LINE",
-            {"start": edge.startPoint().toTuple(), "end": edge.endPoint().toTuple(),},
+            {"start": start.toTuple(), "end": end.toTuple(),},
         )
 
     @staticmethod

tests/test_exporters.py

@@ -942,3 +942,21 @@ def test_dxf_ellipse_arc(tmpdir):
 
     assert w2.val().isValid()
     assert w2.val().Volume() == approx(math.pi * r ** 2 / 4)
+
+
+def test_dxf_edge_iteration(tmpdir):
+
+    w1 = Workplane().box(50, 50, 1).edges("|Z and >XY").fillet(10)
+
+    dxf = exporters.dxf.DxfDocument()
+    dxf.add_layer("layer1", color=1)
+    dxf.add_shape(w1.section(0), "layer1")
+
+    fname = tmpdir.joinpath("edge_iteration1.dxf").resolve()
+    dxf.document.saveas(fname)
+
+    s1 = Sketch().importDXF(fname)
+    edges = s1.edges().vals()
+
+    for e1, e2 in zip(edges, edges[1:]):
+        assert (e2.startPoint() - e1.endPoint()).Length == approx(0.0)