1 /* === S Y N F I G ========================================================= */
2 /*! \file valuenode_log.cpp
3 ** \brief Implementation of the "Natural Logarithm" valuenode conversion.
8 ** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
9 ** Copyright (c) 2007, 2008 Chris Moore
10 ** Copyright (c) 2008 Carlos López
12 ** This package is free software; you can redistribute it and/or
13 ** modify it under the terms of the GNU General Public License as
14 ** published by the Free Software Foundation; either version 2 of
15 ** the License, or (at your option) any later version.
17 ** This package is distributed in the hope that it will be useful,
18 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 ** General Public License for more details.
23 /* ========================================================================= */
25 /* === H E A D E R S ======================================================= */
34 #include "valuenode_log.h"
35 #include "valuenode_const.h"
40 /* === U S I N G =========================================================== */
44 using namespace synfig;
46 /* === M A C R O S ========================================================= */
48 /* === G L O B A L S ======================================================= */
50 /* === P R O C E D U R E S ================================================= */
52 /* === M E T H O D S ======================================================= */
54 ValueNode_Logarithm::ValueNode_Logarithm(const ValueBase &x):
55 LinkableValueNode(x.get_type())
57 Vocab ret(get_children_vocab());
58 set_children_vocab(ret);
59 Real value(x.get(Real()));
60 Real infinity(999999.0);
61 Real epsilon(0.000001);
65 set_link("link", ValueNode_Const::create(Real(value)));
66 set_link("epsilon", ValueNode_Const::create(Real(epsilon)));
67 set_link("infinite", ValueNode_Const::create(Real(infinity)));
71 ValueNode_Logarithm::create(const ValueBase &x)
73 return new ValueNode_Logarithm(x);
77 ValueNode_Logarithm::create_new()const
79 return new ValueNode_Logarithm(get_type());
82 ValueNode_Logarithm::~ValueNode_Logarithm()
88 ValueNode_Logarithm::set_link_vfunc(int i,ValueNode::Handle value)
90 assert(i>=0 && i<link_count());
94 case 0: CHECK_TYPE_AND_SET_VALUE(link_, ValueBase::TYPE_REAL);
95 case 1: CHECK_TYPE_AND_SET_VALUE(epsilon_, ValueBase::TYPE_REAL);
96 case 2: CHECK_TYPE_AND_SET_VALUE(infinite_, ValueBase::TYPE_REAL);
101 ValueNode::LooseHandle
102 ValueNode_Logarithm::get_link_vfunc(int i)const
104 assert(i>=0 && i<link_count());
106 if(i==0) return link_;
107 if(i==1) return epsilon_;
108 if(i==2) return infinite_;
114 ValueNode_Logarithm::operator()(Time t)const
116 if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS"))
117 printf("%s:%d operator()\n", __FILE__, __LINE__);
119 Real link = (*link_) (t).get(Real());
120 Real epsilon = (*epsilon_) (t).get(Real());
121 Real infinite = (*infinite_)(t).get(Real());
123 if (epsilon < 0.00000001)
124 epsilon = 0.00000001;
133 ValueNode_Logarithm::get_name()const
139 ValueNode_Logarithm::get_local_name()const
141 return _("Logarithm");
145 ValueNode_Logarithm::check_type(ValueBase::Type type)
147 return type==ValueBase::TYPE_REAL;
150 LinkableValueNode::Vocab
151 ValueNode_Logarithm::get_children_vocab_vfunc()const
153 if(children_vocab.size())
154 return children_vocab;
156 LinkableValueNode::Vocab ret;
158 ret.push_back(ParamDesc(ValueBase(),"link")
159 .set_local_name(_("Link"))
160 .set_description(_("Value node used to calculate the Neperian logarithm"))
163 ret.push_back(ParamDesc(ValueBase(),"epsilon")
164 .set_local_name(_("Epsilon"))
165 .set_description(_("Value used to compare 'link' with zero "))
168 ret.push_back(ParamDesc(ValueBase(),"infinite")
169 .set_local_name(_("Infinite"))
170 .set_description(_("Returned value when result tends to infinite"))