1 files changed, 115 insertions, 0 deletions
diff --git a/fuzzylite/src/term/Triangle.cpp b/fuzzylite/src/term/Triangle.cpp
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+++ b/fuzzylite/src/term/Triangle.cpp
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+/*
+ Author: Juan Rada-Vilela, Ph.D.
+ Copyright (C) 2010-2014 FuzzyLite Limited
+ All rights reserved
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option)
+ any later version.
+
+ fuzzylite 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 Lesser General Public License
+ for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with fuzzylite.  If not, see <http://www.gnu.org/licenses/>.
+
+ fuzzylite™ is a 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 (fl::Op::isNaN(vertexC)) {
+            //TODO: Modify FLL to allow passing two parameters only.
+            this->_vertexC = vertexB;
+            this->_vertexB = (vertexA + vertexB) / 2.0;
+        }
+    }
+
+    Triangle::~Triangle() {
+    }
+
+    std::string Triangle::className() const {
+        return "Triangle";
+    }
+
+    scalar Triangle::membership(scalar x) const {
+        if (fl::Op::isNaN(x)) return fl::nan;
+
+        if (Op::isLt(x, _vertexA) or Op::isGt(x, _vertexC))
+            return _height * 0.0;
+
+        if (Op::isEq(x, _vertexB))
+            return _height * 1.0;
+
+        if (Op::isLt(x, _vertexB))
+            return _height * (x - _vertexA) / (_vertexB - _vertexA);
+
+        return _height * (_vertexC - x) / (_vertexC - _vertexB);
+    }
+
+    std::string Triangle::parameters() const {
+        return Op::join(3, " ", _vertexA, _vertexB, _vertexC) +
+                (not Op::isEq(_height, 1.0) ? " " + Op::str(_height) : "");
+    }
+
+    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 fl::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;
+    }
+
+
+}