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diff --git a/synfig-core/tags/stable/src/synfig/valuenode_blinecalctangent.cpp b/synfig-core/tags/stable/src/synfig/valuenode_blinecalctangent.cpp
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index 0000000..e8fc826
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+++ b/synfig-core/tags/stable/src/synfig/valuenode_blinecalctangent.cpp
@@ -0,0 +1,241 @@
+/* === S Y N F I G ========================================================= */
+/*!	\file valuenode_blinecalctangent.cpp
+**	\brief Template File
+**
+**	$Id$
+**
+**	\legal
+**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**	Copyright (c) 2007 Chris Moore
+**
+**	This package is free software; you can redistribute it and/or
+**	modify it under the terms of the GNU General Public License as
+**	published by the Free Software Foundation; either version 2 of
+**	the License, or (at your option) any later version.
+**
+**	This package is distributed in the hope that it will be useful,
+**	but WITHOUT ANY WARRANTY; without even the implied warranty of
+**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+**	General Public License for more details.
+**	\endlegal
+*/
+/* ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+#	include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+#	include <config.h>
+#endif
+
+#include "valuenode_blinecalctangent.h"
+#include "valuenode_bline.h"
+#include "valuenode_const.h"
+#include "valuenode_composite.h"
+#include "general.h"
+#include "exception.h"
+#include <ETL/hermite>
+#include <ETL/calculus>
+
+#endif
+
+/* === U S I N G =========================================================== */
+
+using namespace std;
+using namespace etl;
+using namespace synfig;
+
+/* === M A C R O S ========================================================= */
+
+/* === G L O B A L S ======================================================= */
+
+/* === P R O C E D U R E S ================================================= */
+
+/* === M E T H O D S ======================================================= */
+
+ValueNode_BLineCalcTangent::ValueNode_BLineCalcTangent(const ValueBase::Type &x):
+	LinkableValueNode(x)
+{
+	if(x!=ValueBase::TYPE_ANGLE && x!=ValueBase::TYPE_VECTOR)
+		throw Exception::BadType(ValueBase::type_name(x));
+
+	ValueNode_BLine* value_node(new ValueNode_BLine());
+	set_link("bline",value_node);
+	set_link("loop",ValueNode_Const::create(bool(false)));
+	set_link("amount",ValueNode_Const::create(Real(0.5)));
+}
+
+LinkableValueNode*
+ValueNode_BLineCalcTangent::create_new()const
+{
+	return new ValueNode_BLineCalcTangent(get_type());
+}
+
+ValueNode_BLineCalcTangent*
+ValueNode_BLineCalcTangent::create(const ValueBase &x)
+{
+	return new ValueNode_BLineCalcTangent(x.get_type());
+}
+
+ValueNode_BLineCalcTangent::~ValueNode_BLineCalcTangent()
+{
+	unlink_all();
+}
+
+ValueBase
+ValueNode_BLineCalcTangent::operator()(Time t)const
+{
+	const std::vector<ValueBase> bline((*bline_)(t));
+	handle<ValueNode_BLine> bline_value_node(bline_);
+	const bool looped(bline_value_node->get_loop());
+	int size = bline.size(), from_vertex;
+	bool loop((*loop_)(t).get(bool()));
+	Real amount((*amount_)(t).get(Real()));
+	BLinePoint blinepoint0, blinepoint1;
+
+	if (!looped) size--;
+	if (size < 1)
+		switch (get_type())
+		{
+			case ValueBase::TYPE_ANGLE:  return Angle();
+			case ValueBase::TYPE_VECTOR: return Vector();
+			default: assert(0); return ValueBase();
+		}
+	if (loop)
+	{
+		amount = amount - int(amount);
+		if (amount < 0) amount++;
+	}
+	else
+	{
+		if (amount < 0) amount = 0;
+		if (amount > 1) amount = 1;
+	}
+
+	vector<ValueBase>::const_iterator iter, next(bline.begin());
+
+	iter = looped ? --bline.end() : next++;
+	amount = amount * size;
+	from_vertex = int(amount);
+	if (from_vertex > size-1) from_vertex = size-1;
+	blinepoint0 = from_vertex ? *(next+from_vertex-1) : *iter;
+	blinepoint1 = *(next+from_vertex);
+
+	etl::hermite<Vector> curve(blinepoint0.get_vertex(),   blinepoint1.get_vertex(),
+							   blinepoint0.get_tangent2(), blinepoint1.get_tangent1());
+	etl::derivative< etl::hermite<Vector> > deriv(curve);
+
+#ifdef ETL_FIXED_DERIVATIVE
+	switch (get_type())
+	{
+		case ValueBase::TYPE_ANGLE:  return (deriv(amount-from_vertex)*(0.5)).angle();
+		case ValueBase::TYPE_VECTOR: return deriv(amount-from_vertex)*(0.5);
+		default: assert(0); return ValueBase();
+	}
+#else
+	switch (get_type())
+	{
+		case ValueBase::TYPE_ANGLE:  return (deriv(amount-from_vertex)*(-0.5)).angle();
+		case ValueBase::TYPE_VECTOR: return deriv(amount-from_vertex)*(-0.5);
+		default: assert(0); return ValueBase();
+	}
+#endif
+}
+
+String
+ValueNode_BLineCalcTangent::get_name()const
+{
+	return "blinecalctangent";
+}
+
+String
+ValueNode_BLineCalcTangent::get_local_name()const
+{
+	return _("BLine Tangent");
+}
+
+bool
+ValueNode_BLineCalcTangent::set_link_vfunc(int i,ValueNode::Handle x)
+{
+	assert(i>=0 && i<link_count());
+	switch(i)
+	{
+		case 0:
+			bline_=x;
+			signal_child_changed()(i);signal_value_changed()();
+			return true;
+		case 1:
+			loop_=x;
+			signal_child_changed()(i);signal_value_changed()();
+			return true;
+		case 2:
+			amount_=x;
+			signal_child_changed()(i);signal_value_changed()();
+			return true;
+	}
+	return false;
+}
+
+ValueNode::LooseHandle
+ValueNode_BLineCalcTangent::get_link_vfunc(int i)const
+{
+	assert(i>=0 && i<link_count());
+	switch(i)
+	{
+		case 0: return bline_;
+		case 1: return loop_;
+		case 2: return amount_;
+	}
+
+	return 0;
+}
+
+int
+ValueNode_BLineCalcTangent::link_count()const
+{
+	return 3;
+}
+
+String
+ValueNode_BLineCalcTangent::link_name(int i)const
+{
+	assert(i>=0 && i<link_count());
+	switch(i)
+	{
+		case 0: return "bline";
+		case 1: return "loop";
+		case 2: return "amount";
+	}
+	return String();
+}
+
+String
+ValueNode_BLineCalcTangent::link_local_name(int i)const
+{
+	assert(i>=0 && i<link_count());
+	switch(i)
+	{
+		case 0: return _("BLine");
+		case 1: return _("Loop");
+		case 2: return _("Amount");
+	}
+	return String();
+}
+
+int
+ValueNode_BLineCalcTangent::get_link_index_from_name(const String &name)const
+{
+	if(name=="bline")  return 0;
+	if(name=="loop")   return 1;
+	if(name=="amount") return 2;
+	throw Exception::BadLinkName(name);
+}
+
+bool
+ValueNode_BLineCalcTangent::check_type(ValueBase::Type type)
+{
+	return (type==ValueBase::TYPE_ANGLE ||
+			type==ValueBase::TYPE_VECTOR);
+}