-/* === S Y N F I G ========================================================= */
-/*! \file valuenode_segcalctangent.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_segcalctangent.h"
-#include "valuenode_const.h"
-#include "valuenode_composite.h"
-#include "general.h"
-#include "exception.h"
-#include <ETL/hermite>
-#include <ETL/calculus>
-#include "segment.h"
-
-#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_SegCalcTangent::ValueNode_SegCalcTangent(const ValueBase::Type &x):
- LinkableValueNode(x)
-{
- if(x!=ValueBase::TYPE_VECTOR)
- throw Exception::BadType(ValueBase::type_name(x));
-
- set_link("segment",ValueNode_Const::create(ValueBase::TYPE_SEGMENT));
- set_link("amount",ValueNode_Const::create(Real(0.5)));
-}
-
-ValueNode_SegCalcTangent*
-ValueNode_SegCalcTangent::create(const ValueBase &x)
-{
- return new ValueNode_SegCalcTangent(x.get_type());
-}
-
-ValueNode_SegCalcTangent::~ValueNode_SegCalcTangent()
-{
- unlink_all();
-}
-
-ValueBase
-ValueNode_SegCalcTangent::operator()(Time t)const
-{
- Segment segment((*segment_)(t).get(Segment()));
-
- etl::hermite<Vector> curve(segment.p1,segment.p2,segment.t1,segment.t2);
- etl::derivative< etl::hermite<Vector> > deriv(curve);
-
-#ifdef ETL_FIXED_DERIVATIVE
- return deriv((*amount_)(t).get(Real()))*(0.5);
-#else
- return deriv((*amount_)(t).get(Real()))*(-0.5);
-#endif
-
-}
-
-
-String
-ValueNode_SegCalcTangent::get_name()const
-{
- return "segcalctangent";
-}
-
-String
-ValueNode_SegCalcTangent::get_local_name()const
-{
- return _("Segment Tangent");
-}
-
-bool
-ValueNode_SegCalcTangent::check_type(ValueBase::Type type)
-{
- return type==ValueBase::TYPE_VECTOR;
-}
-
-bool
-ValueNode_SegCalcTangent::set_link_vfunc(int i,ValueNode::Handle x)
-{
- assert(i==0 || i==1);
- if(i==0)
- {
- segment_=x;
- signal_child_changed()(i);signal_value_changed()();
- return true;
- }
- if(i==1)
- {
- amount_=x;
- signal_child_changed()(i);signal_value_changed()();
- return true;
- }
- return false;
-}
-
-ValueNode::LooseHandle
-ValueNode_SegCalcTangent::get_link_vfunc(int i)const
-{
- assert(i==0 || i==1);
- if(i==0)
- return segment_;
- if(i==1)
- return amount_;
-
- return 0;
-}
-
-int
-ValueNode_SegCalcTangent::link_count()const
-{
- return 2;
-}
-
-String
-ValueNode_SegCalcTangent::link_name(int i)const
-{
- assert(i==0 || i==1);
- if(i==0)
- return "segment";
- if(i==1)
- return "amount";
- return String();
-}
-
-String
-ValueNode_SegCalcTangent::link_local_name(int i)const
-{
- assert(i==0 || i==1);
- if(i==0)
- return _("Segment");
- if(i==1)
- return _("Amount");
- return String();
-}
-
-int
-ValueNode_SegCalcTangent::get_link_index_from_name(const String &name)const
-{
- if(name=="segment")
- return 0;
- if(name=="amount")
- return 1;
-
- throw Exception::BadLinkName(name);
-}
-
-LinkableValueNode*
-ValueNode_SegCalcTangent::create_new()const
-{
- return new ValueNode_SegCalcTangent(ValueBase::TYPE_VECTOR);
-}