From 9ede51b2f6d37dc62739cd35938ca18b1fa33ba6 Mon Sep 17 00:00:00 2001
From: Daniel Falck <ddfalck@gmail.com>
Date: Sat, 8 Feb 2014 15:16:36 -0800
Subject: [PATCH] added way of breaking BSplines into line segments in
 Shape2DView

---
 src/Mod/Draft/Draft.py          |  4 +++-
 src/Mod/Draft/DraftGeomUtils.py | 25 +++++++++++++++++++------
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/Mod/Draft/Draft.py b/src/Mod/Draft/Draft.py
index 491686ba7..c2ac83a67 100644
--- a/src/Mod/Draft/Draft.py
+++ b/src/Mod/Draft/Draft.py
@@ -4023,9 +4023,11 @@ class _Shape2DView(_DraftObject):
                         "The indices of the faces to be projected in Individual Faces mode")
         obj.addProperty("App::PropertyBool","HiddenLines","Draft",
                         "Show hidden lines")
+        obj.addProperty("App::PropertyBool","Tessellation","Draft", "Tessellate BSplines into line segments using number of spline poles")
         obj.Projection = Vector(0,0,1)
         obj.ProjectionMode = ["Solid","Individual Faces","Cutlines"]
         obj.HiddenLines = False
+        obj.Tessellation = True
         _DraftObject.__init__(self,obj,"Shape2DView")
 
     def execute(self,obj):
@@ -4048,7 +4050,7 @@ class _Shape2DView(_DraftObject):
                 for g in groups[5:]:
                     edges.append(g)
         #return Part.makeCompound(edges)
-        return DraftGeomUtils.cleanProjection(Part.makeCompound(edges))
+        return DraftGeomUtils.cleanProjection(Part.makeCompound(edges),obj.Tessellation)
 
     def createGeometry(self,obj):
         import DraftGeomUtils
diff --git a/src/Mod/Draft/DraftGeomUtils.py b/src/Mod/Draft/DraftGeomUtils.py
index 537226c14..5491aa031 100755
--- a/src/Mod/Draft/DraftGeomUtils.py
+++ b/src/Mod/Draft/DraftGeomUtils.py
@@ -1783,8 +1783,18 @@ def getCircleFromSpline(edge):
     circle = Part.makeCircle(r,c,n)
     #print circle.Curve
     return circle
-    
-def cleanProjection(shape):
+
+def curvetowire(obj,steps):
+    points = obj.copy().discretize(steps)
+    p0 = points[0]
+    edgelist = []
+    for p in points[1:]:
+        edge = Part.makeLine((p0.x,p0.y,p0.z),(p.x,p.y,p.z))
+        edgelist.append(edge)
+        p0 = p
+    return edgelist
+
+def cleanProjection(shape,tessellate):
     "returns a valid compound of edges, by recreating them"
     # this is because the projection algorithm somehow creates wrong shapes.
     # they dispay fine, but on loading the file the shape is invalid
@@ -1808,11 +1818,14 @@ def cleanProjection(shape):
                 else:
                     newedges.append(e.Curve.toShape())
             elif geomType(e) == "BSplineCurve":
-                if isLine(e.Curve):
-                    l = Part.Line(e.Vertexes[0].Point,e.Vertexes[-1].Point).toShape()
-                    newedges.append(l)
+                if tessellate:
+                    newedges.append(Part.Wire(curvetowire(e,e.Curve.NbPoles)))
                 else:
-                    newedges.append(e.Curve.toShape())
+                    if isLine(e.Curve):
+                        l = Part.Line(e.Vertexes[0].Point,e.Vertexes[-1].Point).toShape()
+                        newedges.append(l)
+                    else:
+                        newedges.append(e.Curve.toShape())
             else:
                 newedges.append(e)
         except: