--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file valuenode_pow.cpp
+** \brief Implementation of the "Power" valuenode conversion.
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+** Copyright (c) 2007, 2008 Chris Moore
+** Copyright (c) 2009 Nikita Kitaev
+**
+** 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_pow.h"
+#include "valuenode_const.h"
+#include "general.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_Pow::ValueNode_Pow(const ValueBase &x):
+ LinkableValueNode(x.get_type())
+{
+ Real value(x.get(Real()));
+ Real infinity(999999.0);
+ Real epsilon(0.000001);
+
+ set_link("base", ValueNode_Const::create(Real(value)));
+ set_link("power", ValueNode_Const::create(Real(1)));
+ set_link("epsilon", ValueNode_Const::create(Real(epsilon)));
+ set_link("infinite", ValueNode_Const::create(Real(infinity)));
+}
+
+ValueNode_Pow*
+ValueNode_Pow::create(const ValueBase &x)
+{
+ return new ValueNode_Pow(x);
+}
+
+LinkableValueNode*
+ValueNode_Pow::create_new()const
+{
+ return new ValueNode_Pow(get_type());
+}
+
+ValueNode_Pow::~ValueNode_Pow()
+{
+ unlink_all();
+}
+
+bool
+ValueNode_Pow::set_link_vfunc(int i,ValueNode::Handle value)
+{
+ assert(i>=0 && i<link_count());
+
+ switch(i)
+ {
+ case 0: CHECK_TYPE_AND_SET_VALUE(base_, ValueBase::TYPE_REAL);
+ case 1: CHECK_TYPE_AND_SET_VALUE(power_, ValueBase::TYPE_REAL);
+ case 2: CHECK_TYPE_AND_SET_VALUE(epsilon_, ValueBase::TYPE_REAL);
+ case 3: CHECK_TYPE_AND_SET_VALUE(infinite_, ValueBase::TYPE_REAL);
+ }
+ return false;
+}
+
+ValueNode::LooseHandle
+ValueNode_Pow::get_link_vfunc(int i)const
+{
+ assert(i>=0 && i<link_count());
+
+ if(i==0) return base_;
+ if(i==1) return power_;
+ if(i==2) return epsilon_;
+ if(i==3) return infinite_;
+ return 0;
+}
+
+int
+ValueNode_Pow::link_count()const
+{
+ return 4;
+}
+
+String
+ValueNode_Pow::link_local_name(int i)const
+{
+ assert(i>=0 && i<link_count());
+
+ if(i==0) return _("Base");
+ if(i==1) return _("Power");
+ if(i==2) return _("Epsilon");
+ if(i==3) return _("Infinite");
+ return String();
+}
+
+String
+ValueNode_Pow::link_name(int i)const
+{
+ assert(i>=0 && i<link_count());
+
+ if(i==0) return "base";
+ if(i==1) return "power";
+ if(i==2) return "epsilon";
+ if(i==3) return "infinite";
+ return String();
+}
+
+int
+ValueNode_Pow::get_link_index_from_name(const String &name)const
+{
+ if(name=="base") return 0;
+ if(name=="power") return 1;
+ if(name=="epsilon") return 2;
+ if(name=="infinite") return 3;
+
+ throw Exception::BadLinkName(name);
+}
+
+ValueBase
+ValueNode_Pow::operator()(Time t)const
+{
+ if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS"))
+ printf("%s:%d operator()\n", __FILE__, __LINE__);
+
+ Real base = (*base_) (t).get(Real());
+ Real power = (*power_) (t).get(Real());
+ Real epsilon = (*epsilon_) (t).get(Real());
+ Real infinite = (*infinite_)(t).get(Real());
+
+
+
+ if (epsilon < 0.00000001)
+ epsilon = 0.00000001;
+
+ //Filters for special/undefined cases
+
+ if (abs(power) < epsilon) //x^0 = 1
+ return 1;
+ if (abs(base) < epsilon)
+ if (power > 0) //0^x=0
+ return Real(0);
+ else
+ if ( ( ((int) power) % 2 != 0) && (base < 0) ) //(-0)^(-odd)=-inf
+ return -infinite;
+ else
+ return infinite;
+
+ if (base <= epsilon && ((int) power) != power) //negative number to fractional power -> undefined
+ power = ((int) power); //so round off power to nearest integer
+
+ return pow(base,power);
+
+}
+
+String
+ValueNode_Pow::get_name()const
+{
+ return "power";
+}
+
+String
+ValueNode_Pow::get_local_name()const
+{
+ return _("Power");
+}
+
+bool
+ValueNode_Pow::check_type(ValueBase::Type type)
+{
+ return type==ValueBase::TYPE_REAL;
+}
--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file valuenode_pow.h
+** \brief Header file for implementation of the "Power" valuenode conversion.
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+** Copyright (c) 2007 Chris Moore
+** Copyright (c) 2009 Nikita Kitaev
+**
+** 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
+*/
+/* ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __SYNFIG_VALUENODE_POW_H
+#define __SYNFIG_VALUENODE_POW_H
+
+/* === H E A D E R S ======================================================= */
+
+#include "valuenode.h"
+
+/* === M A C R O S ========================================================= */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+namespace synfig {
+
+class ValueNode_Pow : public LinkableValueNode
+{
+ ValueNode::RHandle base_;
+ ValueNode::RHandle power_;
+ ValueNode::RHandle epsilon_;
+ ValueNode::RHandle infinite_;
+
+public:
+ typedef etl::handle<ValueNode_Pow> Handle;
+ typedef etl::handle<const ValueNode_Pow> ConstHandle;
+
+ ValueNode_Pow(const ValueBase &x);
+
+ virtual ValueBase operator()(Time t)const;
+
+ virtual ~ValueNode_Pow();
+
+ virtual String get_name()const;
+ virtual String get_local_name()const;
+
+
+ virtual ValueNode::LooseHandle get_link_vfunc(int i)const;
+ virtual int link_count()const;
+ virtual String link_name(int i)const;
+
+ virtual String link_local_name(int i)const;
+ virtual int get_link_index_from_name(const String &name)const;
+
+protected:
+ LinkableValueNode* create_new()const;
+ virtual bool set_link_vfunc(int i,ValueNode::Handle x);
+
+public:
+ using synfig::LinkableValueNode::get_link_vfunc;
+
+ using synfig::LinkableValueNode::set_link_vfunc;
+ static bool check_type(ValueBase::Type type);
+ static ValueNode_Pow* create(const ValueBase &x);
+}; // END of class ValueNode_Pow
+
+}; // END of namespace synfig
+
+/* === E N D =============================================================== */
+
+#endif
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