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/*
fuzzylite (R), a fuzzy logic control library in C++.
Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
This file is part of fuzzylite.
fuzzylite is free software: you can redistribute it and/or modify it under
the terms of the FuzzyLite License included with the software.
You should have received a copy of the FuzzyLite License along with
fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
fuzzylite is a registered trademark of FuzzyLite Limited.
*/
#include "fl/term/Triangle.h"
namespace fl {
Triangle::Triangle(const std::string& name, scalar vertexA, scalar vertexB, scalar vertexC, scalar height)
: Term(name, height), _vertexA(vertexA), _vertexB(vertexB), _vertexC(vertexC) {
if (Op::isNaN(vertexC)) {
this->_vertexC = _vertexB;
this->_vertexB = 0.5 * (_vertexA + _vertexB);
}
}
Triangle::~Triangle() { }
std::string Triangle::className() const {
return "Triangle";
}
Complexity Triangle::complexity() const {
return Complexity().comparison(1 + 5).arithmetic(4);
}
scalar Triangle::membership(scalar x) const {
if (Op::isNaN(x)) return fl::nan;
if (Op::isLt(x, _vertexA) or Op::isGt(x, _vertexC))
return Term::_height * 0.0;
if (Op::isEq(x, _vertexB))
return Term::_height * 1.0;
if (Op::isLt(x, _vertexB)) {
if (_vertexA == -fl::inf)
return Term::_height * 1.0;
return Term::_height * (x - _vertexA) / (_vertexB - _vertexA);
}
if (_vertexC == fl::inf)
return Term::_height * 1.0;
return Term::_height * (_vertexC - x) / (_vertexC - _vertexB);
}
std::string Triangle::parameters() const {
return Op::join(3, " ", _vertexA, _vertexB, _vertexC) +
(not Op::isEq(getHeight(), 1.0) ? " " + Op::str(getHeight()) : "");
}
void Triangle::configure(const std::string& parameters) {
if (parameters.empty()) return;
std::vector<std::string> values = Op::split(parameters, " ");
std::size_t required = 3;
if (values.size() < required) {
std::ostringstream ex;
ex << "[configuration error] term <" << className() << ">"
<< " requires <" << required << "> parameters";
throw Exception(ex.str(), FL_AT);
}
setVertexA(Op::toScalar(values.at(0)));
setVertexB(Op::toScalar(values.at(1)));
setVertexC(Op::toScalar(values.at(2)));
if (values.size() > required)
setHeight(Op::toScalar(values.at(required)));
}
void Triangle::setVertexA(scalar a) {
this->_vertexA = a;
}
scalar Triangle::getVertexA() const {
return this->_vertexA;
}
void Triangle::setVertexB(scalar b) {
this->_vertexB = b;
}
scalar Triangle::getVertexB() const {
return this->_vertexB;
}
void Triangle::setVertexC(scalar c) {
this->_vertexC = c;
}
scalar Triangle::getVertexC() const {
return this->_vertexC;
}
Triangle* Triangle::clone() const {
return new Triangle(*this);
}
Term* Triangle::constructor() {
return new Triangle;
}
}
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