diff options
Diffstat (limited to 'fuzzylite/fl/term/Trapezoid.h')
| -rw-r--r-- | fuzzylite/fl/term/Trapezoid.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/fuzzylite/fl/term/Trapezoid.h b/fuzzylite/fl/term/Trapezoid.h new file mode 100644 index 0000000..ebf5ed8 --- /dev/null +++ b/fuzzylite/fl/term/Trapezoid.h @@ -0,0 +1,129 @@ +/* + 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. + */ + +#ifndef FL_TRAPEZOID_H +#define FL_TRAPEZOID_H + +#include "fl/term/Term.h" + +namespace fl { + + /** + The Trapezoid class is a basic Term that represents the trapezoidal + membership function. + + @image html trapezoid.svg + + @author Juan Rada-Vilela, Ph.D. + @see Term + @see Variable + @since 4.0 + */ + class FL_API Trapezoid : public Term { + private: + scalar _vertexA, _vertexB, _vertexC, _vertexD; + public: + explicit Trapezoid(const std::string& name = "", + scalar vertexA = fl::nan, + scalar vertexB = fl::nan, + scalar vertexC = fl::nan, + scalar vertexD = fl::nan, + scalar height = 1.0); + virtual ~Trapezoid() FL_IOVERRIDE; + FL_DEFAULT_COPY_AND_MOVE(Trapezoid) + + virtual std::string className() const FL_IOVERRIDE; + /** + Returns the parameters of the term + @return `"vertexA vertexB vertexC vertexD [height]"` + */ + virtual std::string parameters() const FL_IOVERRIDE; + /** + Configures the term with the parameters + @param parameters as `"vertexA vertexB vertexC vertexD [height]"` + */ + virtual void configure(const std::string& parameters) FL_IOVERRIDE; + + virtual Complexity complexity() const FL_IOVERRIDE; + /** + Computes the membership function evaluated at @f$x@f$ + @param x + @return @f$\begin{cases} + 0h & \mbox{if $x \not\in[a,d]$}\cr + h \times \min(1, (x - a) / (b - a)) & \mbox{if $x < b$}\cr + 1h & \mbox{if $x \leq c$}\cr + h (d - x) / (d - c) & \mbox{if $x < d$}\cr + 0h & \mbox{otherwise} + \end{cases}@f$ + + where @f$h@f$ is the height of the Term, + @f$a@f$ is the first vertex of the Trapezoid, + @f$b@f$ is the second vertex of the Trapezoid, + @f$c@f$ is the third vertex of the Trapezoid, + @f$d@f$ is the fourth vertex of the Trapezoid + */ + virtual scalar membership(scalar x) const FL_IOVERRIDE; + + /** + Sets the first vertex of the trapezoid + @param a is the first vertex of the trapezoid + */ + virtual void setVertexA(scalar a); + /** + Gets the first vertex of the trapezoid + @return the first vertex of the trapezoid + */ + virtual scalar getVertexA() const; + + /** + Sets the second vertex of the trapezoid + @param b is the second vertex of the trapezoid + */ + virtual void setVertexB(scalar b); + /** + Gets the second vertex of the trapezoid + @return the second vertex of the trapezoid + */ + virtual scalar getVertexB() const; + + /** + Sets the third vertex of the trapezoid + @param c is the third vertex of the trapezoid + */ + virtual void setVertexC(scalar c); + /** + Gets the third vertex of the trapezoid + @return the third vertex of the trapezoid + */ + virtual scalar getVertexC() const; + + /** + Sets the fourth vertex of the trapezoid + @param d is the fourth vertex of the trapezoid + */ + virtual void setVertexD(scalar d); + /** + Gets the fourth vertex of the trapezoid + @return the fourth vertex of the trapezoid + */ + virtual scalar getVertexD() const; + + virtual Trapezoid* clone() const FL_IOVERRIDE; + + static Term* constructor(); + }; +} +#endif /* FL_TRAPEZOID_H */ |