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#ifndef _BGFX_TUPLE_B2DTUPLE_HXX
#define _BGFX_TUPLE_B2DTUPLE_HXX

#include <sal/types.h>
#include <basegfx/numeric/ftools.hxx>
#undef min
#undef max
#include <algorithm>

namespace basegfx
{
	// predeclarations
	class B2ITuple;

	/** Base class for all Points/Vectors with two double values

		This class provides all methods common to Point
		avd Vector classes which are derived from here.

		@derive Use this class to implement Points or Vectors
		which are based on two double values
	*/
	class B2DTuple
	{
	protected:
		double										mfX;
		double										mfY;
							
	public:					
		/**	Create a 2D Tuple

        	The tuple is initialized to (0.0, 0.0)
		*/
		B2DTuple() 
		:	mfX(0.0), 
			mfY(0.0) 
		{}

		/**	Create a 2D Tuple

			@param fX
			This parameter is used to initialize the X-coordinate
			of the 2D Tuple.
			
			@param fY
			This parameter is used to initialize the Y-coordinate
			of the 2D Tuple.
		*/
		B2DTuple(double fX, double fY) 
		:	mfX( fX ), 
			mfY( fY ) 
		{}

		/**	Create a copy of a 2D Tuple

			@param rTup
			The 2D Tuple which will be copied.
		*/
		B2DTuple(const B2DTuple& rTup) 
		:	mfX( rTup.mfX ), 
			mfY( rTup.mfY ) 
		{}

		/**	Create a copy of a 2D integer Tuple

			@param rTup
			The 2D Tuple which will be copied.
		*/
		BASEGFX_DLLPUBLIC explicit B2DTuple(const B2ITuple& rTup);

		~B2DTuple() 
		{}

		/// Get X-Coordinate of 2D Tuple
		double getX() const
		{ 
			return mfX; 
		}

		/// Get Y-Coordinate of 2D Tuple
		double getY() const
		{ 
			return mfY; 
		}

		/// Set X-Coordinate of 2D Tuple
		void setX(double fX)
		{
			mfX = fX;
		}

		/// Set Y-Coordinate of 2D Tuple
		void setY(double fY)
		{
			mfY = fY;
		}

		/// Array-access to 2D Tuple
		const double& operator[] (int nPos) const 
		{ 
			// Here, normally one if(...) should be used. In the assumption that
			// both double members can be accessed as an array a shortcut is used here.
			// if(0 == nPos) return mfX; return mfY;
			return *((&mfX) + nPos);
		}

		/// Array-access to 2D Tuple
		double& operator[] (int nPos)
		{ 
			// Here, normally one if(...) should be used. In the assumption that
			// both double members can be accessed as an array a shortcut is used here.
			// if(0 == nPos) return mfX; return mfY;
			return *((&mfX) + nPos);
		}

		// comparators with tolerance
		//////////////////////////////////////////////////////////////////////

		bool equalZero() const
		{ 
			return (this == &getEmptyTuple() || 
					(fTools::equalZero(mfX) && fTools::equalZero(mfY)));
		}

		bool equalZero(const double& rfSmallValue) const
		{ 
			return (this == &getEmptyTuple() || 
					(fTools::equalZero(mfX, rfSmallValue) && fTools::equalZero(mfY, rfSmallValue)));
		}

		bool equal(const B2DTuple& rTup) const
		{ 
			return (
				this == &rTup ||
				(fTools::equal(mfX, rTup.mfX) && 
				fTools::equal(mfY, rTup.mfY)));
		}

		bool equal(const B2DTuple& rTup, const double& rfSmallValue) const
		{ 
			return (
				this == &rTup ||
				(fTools::equal(mfX, rTup.mfX, rfSmallValue) && 
				fTools::equal(mfY, rTup.mfY, rfSmallValue)));
		}

		// operators
		//////////////////////////////////////////////////////////////////////

		B2DTuple& operator+=( const B2DTuple& rTup ) 
		{ 
			mfX += rTup.mfX;
			mfY += rTup.mfY; 
			return *this; 
		}

		B2DTuple& operator-=( const B2DTuple& rTup ) 
		{ 
			mfX -= rTup.mfX;
			mfY -= rTup.mfY; 
			return *this; 
		}

		B2DTuple& operator/=( const B2DTuple& rTup ) 
		{ 
			mfX /= rTup.mfX;
			mfY /= rTup.mfY; 
			return *this; 
		}

		B2DTuple& operator*=( const B2DTuple& rTup ) 
		{ 
			mfX *= rTup.mfX;
			mfY *= rTup.mfY; 
			return *this; 
		}

		B2DTuple& operator*=(double t) 
		{ 
			mfX *= t; 
			mfY *= t; 
			return *this; 
		}

		B2DTuple& operator/=(double t) 
		{ 
			const double fVal(1.0 / t);
			mfX *= fVal; 
			mfY *= fVal; 
			return *this; 
		}

		B2DTuple operator-(void) const 
		{	
			return B2DTuple(-mfX, -mfY); 
		}
		
		bool operator==( const B2DTuple& rTup ) const 
		{ 
			return mfX == rTup.mfX && mfY == rTup.mfY;
		}

		bool operator!=( const B2DTuple& rTup ) const 
		{ 
			return mfX != rTup.mfX || mfY != rTup.mfY;
		}
		
		B2DTuple& operator=( const B2DTuple& rTup ) 
		{ 
			mfX = rTup.mfX;
			mfY = rTup.mfY; 
			return *this; 
		}

		BASEGFX_DLLPUBLIC void correctValues(const double fCompareValue = 0.0);

		BASEGFX_DLLPUBLIC static const B2DTuple& getEmptyTuple();
	};

	// external operators
	//////////////////////////////////////////////////////////////////////////

	inline B2DTuple minimum(const B2DTuple& rTupA, const B2DTuple& rTupB) 
	{ 
        return B2DTuple(
            std::min(rTupB.getX(), rTupA.getX()),
            std::min(rTupB.getY(), rTupA.getY())); 
	}

	inline B2DTuple maximum(const B2DTuple& rTupA, const B2DTuple& rTupB) 
	{ 
        return B2DTuple(
            std::max(rTupB.getX(), rTupA.getX()),
            std::max(rTupB.getY(), rTupA.getY())); 
	}

	inline B2DTuple absolute(const B2DTuple& rTup) 
	{ 
		B2DTuple aAbs(
            fabs(rTup.getX()),
            fabs(rTup.getY())); 
		return aAbs;
	}

	inline B2DTuple interpolate(const B2DTuple& rOld1, const B2DTuple& rOld2, double t) 
	{ 
        if(rOld1 == rOld2)
        {
            return rOld1;
        }
        else if(0.0 >= t)
        {
            return rOld1;
        }
        else if(1.0 <= t)
        {
            return rOld2;
        }
        else
        {
            return B2DTuple(
			    ((rOld2.getX() - rOld1.getX()) * t) + rOld1.getX(),
			    ((rOld2.getY() - rOld1.getY()) * t) + rOld1.getY()); 
        }
	}

	inline B2DTuple average(const B2DTuple& rOld1, const B2DTuple& rOld2) 
	{ 
        return B2DTuple(
            rOld1.getX() == rOld2.getX() ? rOld1.getX() : (rOld1.getX() + rOld2.getX()) * 0.5,
            rOld1.getY() == rOld2.getY() ? rOld1.getY() : (rOld1.getY() + rOld2.getY()) * 0.5);
	}
	
	inline B2DTuple average(const B2DTuple& rOld1, const B2DTuple& rOld2, const B2DTuple& rOld3)
	{ 
        return B2DTuple(
            (rOld1.getX() == rOld2.getX() && rOld2.getX() == rOld3.getX()) ? rOld1.getX() : (rOld1.getX() + rOld2.getX() + rOld3.getX()) * (1.0 / 3.0),
            (rOld1.getY() == rOld2.getY() && rOld2.getY() == rOld3.getY()) ? rOld1.getY() : (rOld1.getY() + rOld2.getY() + rOld3.getY()) * (1.0 / 3.0)); 
	}

	inline B2DTuple operator+(const B2DTuple& rTupA, const B2DTuple& rTupB)
	{ 
		B2DTuple aSum(rTupA); 
		aSum += rTupB; 
		return aSum; 
	}

	inline B2DTuple operator-(const B2DTuple& rTupA, const B2DTuple& rTupB)
	{ 
		B2DTuple aSub(rTupA); 
		aSub -= rTupB; 
		return aSub; 
	}

	inline B2DTuple operator/(const B2DTuple& rTupA, const B2DTuple& rTupB)
	{ 
		B2DTuple aDiv(rTupA); 
		aDiv /= rTupB; 
		return aDiv; 
	}

	inline B2DTuple operator*(const B2DTuple& rTupA, const B2DTuple& rTupB)
	{ 
		B2DTuple aMul(rTupA); 
		aMul *= rTupB; 
		return aMul; 
	}

	inline B2DTuple operator*(const B2DTuple& rTup, double t)
	{ 
		B2DTuple aNew(rTup); 
		aNew *= t; 
		return aNew; 
	}

	inline B2DTuple operator*(double t, const B2DTuple& rTup)
	{ 
		B2DTuple aNew(rTup); 
		aNew *= t; 
		return aNew; 
	}

	inline B2DTuple operator/(const B2DTuple& rTup, double t)
	{ 
		B2DTuple aNew(rTup); 
		aNew /= t; 
		return aNew; 
	}

	inline B2DTuple operator/(double t, const B2DTuple& rTup)
	{
		B2DTuple aNew(t, t); 
		B2DTuple aTmp(rTup); 
		aNew /= aTmp; 
		return aNew; 
	}

	/** Round double to nearest integer for 2D tuple

		@return the nearest integer for this tuple
	*/
	BASEGFX_DLLPUBLIC B2ITuple fround(const B2DTuple& rTup);
} // end of namespace basegfx

#endif /* _BGFX_TUPLE_B2DTUPLE_HXX */