allen.h

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/* MIT License 
*/

//== FILEDOC =========================================================================

//== BEGINNING OF CODE ===============================================================

#ifndef __SBNW_ALLEN_H_
#define __SBNW_ALLEN_H_

//== INCLUDES ========================================================================

#include "SagittariusCore.h"
#include "min_max.h"

//-- C++ code --
#ifdef __cplusplus

namespace LibsbmlDraw {
    
    class Interval {
        public:
            Interval(const Real a, const Real b) {
                if(a <= b) {
                    _a = a;
                    _b = b;
                } else {
                    _a = b;
                    _b = a;
                }
            }
            
            Real a() const { return _a; }
            
            Real& a() { return _a; }
            
            Real b() const { return _b; }
            
            Real& b() { return _b; }
        private:
            Real _a, _b;
    };

    inline Real allenDist(const Real u, const Real v, const Real x, const Real y) {
        if(!(v < x || y < u))
            //intersect
            return 0.;
        Real a = x-v, b=u-y; //one will be negative
        return max(a,b);
    }

    inline Real allenOrdered(const Real u, const Real v, const Real x, const Real y) {
        // think of it like the result of b-a, where b and a are intervals
        if(!(v < x || y < u))
            //intersect
            return 0.;
        if(v < x)
            return x-v; //positive
        else
            return y-u; //negative
    }
    
    inline bool pointInInterval(const Real p, const Interval& i) {
        return (i.a() <= p && p <= i.b()) ? true : false;
    }
    
}

#endif

#endif