From d4c3f9a264e9e8c2f1cf802c8d7e4398c52761dd Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 25 Feb 2019 10:50:38 +0100
Subject: [PATCH] add method to Python interface to get reflect lines of a
 shape

---
 src/Mod/Part/App/TopoShapePy.xml    |  8 +++++
 src/Mod/Part/App/TopoShapePyImp.cpp | 46 +++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/src/Mod/Part/App/TopoShapePy.xml b/src/Mod/Part/App/TopoShapePy.xml
index 4399528d10..c370745758 100644
--- a/src/Mod/Part/App/TopoShapePy.xml
+++ b/src/Mod/Part/App/TopoShapePy.xml
@@ -523,6 +523,14 @@ makePerspectiveProjection(shape, pnt)
         </UserDocu>
       </Documentation>
     </Methode>
+    <Methode Name="reflectLines" Const="true" Keyword="true">
+      <Documentation>
+        <UserDocu>Build reflect lines on a shape according to the axes of view.
+Reflect lines are represented by edges in 3d.
+reflectLines(ViewDir, ViewPos, UpDir) -> Shape
+        </UserDocu>
+      </Documentation>
+    </Methode>
     <Methode Name="makeShapeFromMesh">
       <Documentation>
         <UserDocu>Make a compound shape out of mesh data.
diff --git a/src/Mod/Part/App/TopoShapePyImp.cpp b/src/Mod/Part/App/TopoShapePyImp.cpp
index dc1deb386e..d23dec348b 100644
--- a/src/Mod/Part/App/TopoShapePyImp.cpp
+++ b/src/Mod/Part/App/TopoShapePyImp.cpp
@@ -60,6 +60,7 @@
 # include <Precision.hxx>
 #endif
 
+#include <HLRAppli_ReflectLines.hxx>
 #include <BRepGProp.hxx>
 #include <GProp_GProps.hxx>
 #include <BRepAlgo_NormalProjection.hxx>
@@ -1973,6 +1974,51 @@ PyObject* TopoShapePy::makePerspectiveProjection(PyObject *args)
     return 0;
 }
 
+/*!
+from pivy import coin
+
+rot=Gui.ActiveDocument.ActiveView.getCameraOrientation()
+vdir=App.Vector(0,0,-1)
+vdir=rot.multVec(vdir)
+udir=App.Vector(0,1,0)
+udir=rot.multVec(udir)
+
+pos=Gui.ActiveDocument.ActiveView.getCameraNode().position.getValue().getValue()
+pos=App.Vector(*pos)
+
+shape=App.ActiveDocument.ActiveObject.Shape
+reflect=shape.reflectLines(ViewDir=vdir, ViewPos=pos, UpDir=udir)
+Part.show(reflect)
+ */
+PyObject* TopoShapePy::reflectLines(PyObject *args, PyObject *kwds)
+{
+    static char *kwlist[] = {"ViewDir", "ViewPos", "UpDir", NULL};
+
+    PyObject *pView, *pPos, *pUp;
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!O!O!", kwlist,
+                                     &Base::VectorPy::Type, &pView,
+                                     &Base::VectorPy::Type, &pPos,
+                                     &Base::VectorPy::Type, &pUp))
+        return 0;
+
+    try {
+        Base::Vector3d v = Py::Vector(pView,false).toVector();
+        Base::Vector3d p = Py::Vector(pPos,false).toVector();
+        Base::Vector3d u = Py::Vector(pUp,false).toVector();
+
+        const TopoDS_Shape& shape = this->getTopoShapePtr()->getShape();
+        HLRAppli_ReflectLines reflect(shape);
+        reflect.SetAxes(v.x, v.y, v.z, p.x, p.y, p.z, u.x, u.y, u.z);
+        reflect.Perform();
+        TopoDS_Shape lines = reflect.GetResult();
+        return new TopoShapePy(new TopoShape(lines));
+    }
+    catch (Standard_Failure& e) {
+        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
+        return 0;
+    }
+}
+
 PyObject* TopoShapePy::makeShapeFromMesh(PyObject *args)
 {
     PyObject *tup;