From 8d48084b9a179d2eeabb225fbb4fe3877f497ddc Mon Sep 17 00:00:00 2001
From: genete <genete@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Date: Wed, 22 Apr 2009 15:43:31 +0000
Subject: [PATCH] Apply patch #18: Valuenode Type Power. Thanks to nikitakit.

git-svn-id: https://synfig.svn.sourceforge.net/svnroot/synfig@2362 1f10aa63-cdf2-0310-b900-c93c546f37ac
---
 synfig-core/trunk/src/synfig/Makefile.am       |   2 +
 synfig-core/trunk/src/synfig/valuenode.cpp     |   2 +
 synfig-core/trunk/src/synfig/valuenode_pow.cpp | 204 +++++++++++++++++++++++++
 synfig-core/trunk/src/synfig/valuenode_pow.h   |  84 ++++++++++
 4 files changed, 292 insertions(+)
 create mode 100644 synfig-core/trunk/src/synfig/valuenode_pow.cpp
 create mode 100644 synfig-core/trunk/src/synfig/valuenode_pow.h

diff --git a/synfig-core/trunk/src/synfig/Makefile.am b/synfig-core/trunk/src/synfig/Makefile.am
index a406f9a..88a6b90 100644
--- a/synfig-core/trunk/src/synfig/Makefile.am
+++ b/synfig-core/trunk/src/synfig/Makefile.am
@@ -84,6 +84,7 @@ VALUENODEHEADERS = \
 	valuenode_join.h \
 	valuenode_linear.h \
 	valuenode_log.h \
+	valuenode_pow.h \
 	valuenode_radialcomposite.h \
 	valuenode_range.h \
 	valuenode_realstring.h \
@@ -132,6 +133,7 @@ VALUENODESOURCES = \
 	valuenode_join.cpp \
 	valuenode_linear.cpp \
 	valuenode_log.cpp \
+	valuenode_pow.cpp \
 	valuenode_radialcomposite.cpp \
 	valuenode_range.cpp \
 	valuenode_realstring.cpp \
diff --git a/synfig-core/trunk/src/synfig/valuenode.cpp b/synfig-core/trunk/src/synfig/valuenode.cpp
index 7059cf9..21645c8 100644
--- a/synfig-core/trunk/src/synfig/valuenode.cpp
+++ b/synfig-core/trunk/src/synfig/valuenode.cpp
@@ -86,6 +86,7 @@
 #include "valuenode_anglestring.h"
 #include "valuenode_intstring.h"
 #include "valuenode_log.h"
+#include "valuenode_pow.h"
 
 #include "layer.h"
 
@@ -181,6 +182,7 @@ ValueNode::subsys_init()
 	ADD_VALUENODE(ValueNode_Logarithm,		  "logarithm",		  _("Logarithm"),		 RELEASE_VERSION_0_61_09); // SVN r2034
 
 	ADD_VALUENODE(ValueNode_Greyed,			  "greyed",			  _("Greyed"),			 RELEASE_VERSION_0_61_10); // SVN r2305
+	ADD_VALUENODE(ValueNode_Pow,		  "power",		  _("Power"),		 RELEASE_VERSION_0_61_09); // SVN r2362
 
 #undef ADD_VALUENODE
 #undef ADD_VALUENODE2
diff --git a/synfig-core/trunk/src/synfig/valuenode_pow.cpp b/synfig-core/trunk/src/synfig/valuenode_pow.cpp
new file mode 100644
index 0000000..fa00618
--- /dev/null
+++ b/synfig-core/trunk/src/synfig/valuenode_pow.cpp
@@ -0,0 +1,204 @@
+/* === 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;
+}
diff --git a/synfig-core/trunk/src/synfig/valuenode_pow.h b/synfig-core/trunk/src/synfig/valuenode_pow.h
new file mode 100644
index 0000000..69237fd
--- /dev/null
+++ b/synfig-core/trunk/src/synfig/valuenode_pow.h
@@ -0,0 +1,84 @@
+/* === 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
-- 
2.7.4