Sketcher: BSpline FreeGCS geometry definition

=============================================

multiplicities, degree and periodic are left as non-parameters of the solver, while still allowing certain manipulations to be effected from the solver
in certain situations (for example modifying the multiplicity of start/end nodes when applying G1,G2,G3 constraints between BSplines).

src/Mod/Sketcher/App/planegcs/Geo.cpp

@@ -607,4 +607,75 @@ ArcOfParabola* ArcOfParabola::Copy()
     return crv;
 }
 
+// bspline
+DeriVector2 BSpline::CalculateNormal(Point& p, double* derivparam)
+{
+    // place holder
+    DeriVector2 ret = DeriVector2();
+
+    return ret;
+}
+
+DeriVector2 BSpline::Value(double u, double du, double* derivparam)
+{
+
+    // place holder
+    DeriVector2 ret = DeriVector2();
+
+    return ret;
+}
+
+int BSpline::PushOwnParams(VEC_pD &pvec)
+{
+    int cnt=0;
+
+    for(VEC_P::const_iterator it = poles.begin(); it != poles.end(); ++it) {
+	pvec.push_back( (*it).x );
+	pvec.push_back( (*it).y );
+    }
+
+    cnt = cnt + poles.size() * 2;
+
+    pvec.insert(pvec.end(), weights.begin(), weights.end());
+    cnt = cnt + weights.size();
+
+    pvec.insert(pvec.end(), knots.begin(), knots.end());
+    cnt = cnt + knots.size();
+    
+    pvec.push_back(start.x); cnt++;
+    pvec.push_back(start.y); cnt++;
+    pvec.push_back(end.x); cnt++;
+    pvec.push_back(end.y); cnt++;
+
+    return cnt;
+}
+
+void BSpline::ReconstructOnNewPvec(VEC_pD &pvec, int &cnt)
+{
+    for(VEC_P::iterator it = poles.begin(); it != poles.end(); ++it) {
+	(*it).x = pvec[cnt]; cnt++;
+	(*it).y = pvec[cnt]; cnt++;
+    }
+
+    for(VEC_pD::iterator it = weights.begin(); it != weights.end(); ++it) {
+	(*it) = pvec[cnt]; cnt++;
+    }
+
+    for(VEC_pD::iterator it = knots.begin(); it != knots.end(); ++it) {
+	(*it) = pvec[cnt]; cnt++;
+    }
+    
+    start.x=pvec[cnt]; cnt++;
+    start.y=pvec[cnt]; cnt++;
+    end.x=pvec[cnt]; cnt++;
+    end.y=pvec[cnt]; cnt++;
+
+}
+
+BSpline* BSpline::Copy()
+{
+    BSpline* crv = new BSpline(*this);
+    return crv;
+}
+
 }//namespace GCS