From ca48841b8c05c2d7a67c1bdb63431c2010e75f75 Mon Sep 17 00:00:00 2001
From: Abdullah Tahiri <abdullah.tahiri.yo@gmail.com>
Date: Sun, 26 Feb 2017 22:43:27 +0100
Subject: [PATCH] Part: GeomBSplineCurve extension to get, increase or reduce
 multiplicity

---
 src/Mod/Part/App/Geometry.cpp | 37 +++++++++++++++++++++++++++++++++++
 src/Mod/Part/App/Geometry.h   |  6 +++++-
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Part/App/Geometry.cpp b/src/Mod/Part/App/Geometry.cpp
index 2ebf25ad84..48583c3f34 100644
--- a/src/Mod/Part/App/Geometry.cpp
+++ b/src/Mod/Part/App/Geometry.cpp
@@ -793,6 +793,17 @@ std::vector<int> GeomBSplineCurve::getMultiplicities() const
     return mults;
 }
 
+int GeomBSplineCurve::getMultiplicity(int index) const
+{
+    try {
+        return myCurve->Multiplicity(index);
+    }
+    catch (Standard_Failure) {
+        Handle_Standard_Failure e = Standard_Failure::Caught();
+        throw Base::RuntimeError(e->GetMessageString());
+    }
+}
+
 int GeomBSplineCurve::getDegree() const
 {
     return myCurve->Degree();
@@ -914,6 +925,32 @@ void GeomBSplineCurve::increaseDegree(double degree)
     }
 }
 
+void GeomBSplineCurve::increaseMultiplicity(int index, int multiplicity)
+{
+    try {
+        Handle_Geom_BSplineCurve curve = Handle_Geom_BSplineCurve::DownCast(this->handle());
+        curve->IncreaseMultiplicity(index, multiplicity);
+        return;
+    }
+    catch (Standard_Failure) {
+        Handle_Standard_Failure e = Standard_Failure::Caught();
+        throw Base::RuntimeError(e->GetMessageString());
+    }
+}
+
+bool GeomBSplineCurve::removeKnot(int index, int multiplicity, double tolerance)
+{
+    try {
+        Handle_Geom_BSplineCurve curve = Handle_Geom_BSplineCurve::DownCast(this->handle());
+        return curve->RemoveKnot(index, multiplicity, tolerance) == Standard_True;
+    }
+    catch (Standard_Failure) {
+        Handle_Standard_Failure e = Standard_Failure::Caught();
+        throw Base::RuntimeError(e->GetMessageString());
+    }
+}
+
+
 // Persistence implementer
 unsigned int GeomBSplineCurve::getMemSize (void) const
 {
diff --git a/src/Mod/Part/App/Geometry.h b/src/Mod/Part/App/Geometry.h
index bb579d4e70..8dfffb067f 100644
--- a/src/Mod/Part/App/Geometry.h
+++ b/src/Mod/Part/App/Geometry.h
@@ -226,14 +226,18 @@ public:
     std::vector<double> getWeights() const;
     std::vector<double> getKnots() const;
     std::vector<int> getMultiplicities() const;
+    int getMultiplicity(int index) const;
     int getDegree() const;
     bool isPeriodic() const;
     bool join(const Handle_Geom_BSplineCurve&);
     void makeC1Continuous(double, double);
     std::list<Geometry*> toBiArcs(double tolerance) const;
-    
+
     void increaseDegree(double degree);
 
+    void increaseMultiplicity(int index, int multiplicity);
+    bool removeKnot(int index, int multiplicity, double tolerance = Precision::PConfusion());
+
     // Persistence implementer ---------------------
     virtual unsigned int getMemSize(void) const;
     virtual void Save(Base::Writer &/*writer*/) const;