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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.
+ */
+
+#ifndef FL_SPIKE_H
+#define FL_SPIKE_H
+
+#include "fl/term/Term.h"
+
+namespace fl {
+
+    /**
+      The Spike class is an extended Term that represents the spike membership
+      function.
+
+      @image html spike.svg
+
+      @author Juan Rada-Vilela, Ph.D.
+      @see Term
+      @see Variable
+      @since 5.0
+     */
+    class FL_API Spike : public Term {
+    private:
+        scalar _center, _width;
+    public:
+        explicit Spike(const std::string& name = "",
+                scalar center = fl::nan,
+                scalar width = fl::nan,
+                scalar height = 1.0);
+        virtual ~Spike() FL_IOVERRIDE;
+        FL_DEFAULT_COPY_AND_MOVE(Spike)
+
+        virtual std::string className() const FL_IOVERRIDE;
+        /**
+          Returns the parameters of the term
+          @return `"center width [height]"`
+         */
+        virtual std::string parameters() const FL_IOVERRIDE;
+        /**
+          Configures the term with the parameters
+          @param parameters as `"center width [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$h \times \exp(-|10 / w (x - c)|)@f$
+
+          where @f$h@f$ is the height of the Term,
+                @f$w@f$ is the width of the Spike,
+                @f$c@f$ is the center of the Spike
+         */
+        virtual scalar membership(scalar x) const FL_IOVERRIDE;
+
+        /**
+          Sets the center of the spike
+          @param center is the center of the spike
+         */
+        virtual void setCenter(scalar center);
+        /**
+          Gets the center of the spike
+          @return the center of the spike
+         */
+        virtual scalar getCenter() const;
+
+        /**
+          Sets the width of the spike
+          @param width is the width of the spike
+         */
+        virtual void setWidth(scalar width);
+        /**
+          Gets the width of the spike
+          @return the width of the spike
+         */
+        virtual scalar getWidth() const;
+
+        virtual Spike* clone() const FL_IOVERRIDE;
+
+        static Term* constructor();
+    };
+}
+#endif  /* FL_SPIKE_H */
+