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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/PiShape.h"
namespace fl {
PiShape::PiShape(const std::string& name, scalar bottomLeft, scalar topLeft,
scalar topRight, scalar bottomRight, scalar height)
: Term(name, height), _bottomLeft(bottomLeft), _topLeft(topLeft),
_topRight(topRight), _bottomRight(bottomRight) { }
PiShape::~PiShape() { }
std::string PiShape::className() const {
return "PiShape";
}
Complexity PiShape::complexity() const {
return Complexity().comparison(1 + 6).arithmetic(1 + 5 + 5).function(1 + 1);
}
scalar PiShape::membership(scalar x) const {
if (Op::isNaN(x)) return fl::nan;
scalar sshape;
if (Op::isLE(x, _bottomLeft))
sshape = 0.0;
else if (Op::isLE(x, 0.5 * (_bottomLeft + _topLeft)))
sshape = 2.0 * std::pow((x - _bottomLeft) / (_topLeft - _bottomLeft), 2);
else if (Op::isLt(x, _topLeft))
sshape = 1.0 - 2.0 * std::pow((x - _topLeft) / (_topLeft - _bottomLeft), 2);
else sshape = 1.0;
scalar zshape;
if (Op::isLE(x, _topRight))
zshape = 1.0;
else if (Op::isLE(x, 0.5 * (_topRight + _bottomRight)))
zshape = 1.0 - 2.0 * std::pow((x - _topRight) / (_bottomRight - _topRight), 2);
else if (Op::isLt(x, _bottomRight))
zshape = 2.0 * std::pow((x - _bottomRight) / (_bottomRight - _topRight), 2);
else zshape = 0.0;
return Term::_height * sshape * zshape;
}
std::string PiShape::parameters() const {
return Op::join(4, " ", _bottomLeft, _topLeft, _topRight, _bottomRight) +
(not Op::isEq(getHeight(), 1.0) ? " " + Op::str(getHeight()) : "");
}
void PiShape::configure(const std::string& parameters) {
if (parameters.empty()) return;
std::vector<std::string> values = Op::split(parameters, " ");
std::size_t required = 4;
if (values.size() < required) {
std::ostringstream ex;
ex << "[configuration error] term <" << className() << ">"
<< " requires <" << required << "> parameters";
throw Exception(ex.str(), FL_AT);
}
setBottomLeft(Op::toScalar(values.at(0)));
setTopLeft(Op::toScalar(values.at(1)));
setTopRight(Op::toScalar(values.at(2)));
setBottomRight(Op::toScalar(values.at(3)));
if (values.size() > required)
setHeight(Op::toScalar(values.at(required)));
}
void PiShape::setBottomLeft(scalar a) {
this->_bottomLeft = a;
}
scalar PiShape::getBottomLeft() const {
return this->_bottomLeft;
}
void PiShape::setTopLeft(scalar b) {
this->_topLeft = b;
}
scalar PiShape::getTopLeft() const {
return this->_topLeft;
}
void PiShape::setTopRight(scalar d) {
this->_topRight = d;
}
scalar PiShape::getTopRight() const {
return this->_topRight;
}
void PiShape::setBottomRight(scalar c) {
this->_bottomRight = c;
}
scalar PiShape::getBottomRight() const {
return this->_bottomRight;
}
PiShape* PiShape::clone() const {
return new PiShape(*this);
}
Term* PiShape::constructor() {
return new PiShape;
}
}
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