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 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
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#ifndef _BGFX_TUPLE_B2ITUPLE_HXX
#define _BGFX_TUPLE_B2ITUPLE_HXX

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

namespace basegfx
{
	/** Base class for all Points/Vectors with two sal_Int32 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 sal_Int32 values
	*/
	class BASEGFX_DLLPUBLIC B2ITuple
	{
	protected:
		sal_Int32										mnX;
		sal_Int32										mnY;
							
	public:					
		/**	Create a 2D Tuple

        	The tuple is initialized to (0, 0)
		*/
		B2ITuple() 
		:	mnX(0), 
			mnY(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.
		*/
		B2ITuple(sal_Int32 fX, sal_Int32 fY) 
		:	mnX( fX ), 
			mnY( fY ) 
		{}

		/**	Create a copy of a 2D Tuple

			@param rTup
			The 2D Tuple which will be copied.
		*/
		B2ITuple(const B2ITuple& rTup) 
		:	mnX( rTup.mnX ), 
			mnY( rTup.mnY ) 
		{}

		~B2ITuple() 
		{}

		/// Get X-Coordinate of 2D Tuple
		sal_Int32 getX() const
		{ 
			return mnX; 
		}

		/// Get Y-Coordinate of 2D Tuple
		sal_Int32 getY() const
		{ 
			return mnY; 
		}

		/// Set X-Coordinate of 2D Tuple
		void setX(sal_Int32 fX)
		{
			mnX = fX;
		}

		/// Set Y-Coordinate of 2D Tuple
		void setY(sal_Int32 fY)
		{
			mnY = fY;
		}

		/// Array-access to 2D Tuple
		const sal_Int32& operator[] (int nPos) const 
		{ 
			// Here, normally one if(...) should be used. In the assumption that
			// both sal_Int32 members can be accessed as an array a shortcut is used here.
			// if(0 == nPos) return mnX; return mnY;
			return *((&mnX) + nPos);
		}

		/// Array-access to 2D Tuple
		sal_Int32& operator[] (int nPos)
		{ 
			// Here, normally one if(...) should be used. In the assumption that
			// both sal_Int32 members can be accessed as an array a shortcut is used here.
			// if(0 == nPos) return mnX; return mnY;
			return *((&mnX) + nPos);
		}

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

		B2ITuple& operator+=( const B2ITuple& rTup ) 
		{ 
			mnX += rTup.mnX;
			mnY += rTup.mnY; 
			return *this; 
		}

		B2ITuple& operator-=( const B2ITuple& rTup ) 
		{ 
			mnX -= rTup.mnX;
			mnY -= rTup.mnY; 
			return *this; 
		}

		B2ITuple& operator/=( const B2ITuple& rTup ) 
		{ 
			mnX /= rTup.mnX;
			mnY /= rTup.mnY; 
			return *this; 
		}

		B2ITuple& operator*=( const B2ITuple& rTup ) 
		{ 
			mnX *= rTup.mnX;
			mnY *= rTup.mnY; 
			return *this; 
		}

		B2ITuple& operator*=(sal_Int32 t) 
		{ 
			mnX *= t; 
			mnY *= t; 
			return *this; 
		}

		B2ITuple& operator/=(sal_Int32 t) 
		{ 
			mnX /= t; 
			mnY /= t; 
			return *this; 
		}

		B2ITuple operator-(void) const 
		{	
			return B2ITuple(-mnX, -mnY); 
		}
		
		bool equalZero() const 
        { 
            return mnX == 0 && mnY == 0; 
        }

		bool operator==( const B2ITuple& rTup ) const 
		{ 
			return this == &rTup || (rTup.mnX == mnX && rTup.mnY == mnY);
		}

		bool operator!=( const B2ITuple& rTup ) const 
		{ 
			return !(*this == rTup);
		}
		
		B2ITuple& operator=( const B2ITuple& rTup ) 
		{ 
			mnX = rTup.mnX;
			mnY = rTup.mnY; 
			return *this; 
		}

		static const B2ITuple& getEmptyTuple();
	};

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

	inline B2ITuple minimum(const B2ITuple& rTupA, const B2ITuple& rTupB) 
	{ 
        return B2ITuple(
            std::min(rTupB.getX(), rTupA.getX()),
            std::min(rTupB.getY(), rTupA.getY())); 
	}

	inline B2ITuple maximum(const B2ITuple& rTupA, const B2ITuple& rTupB) 
	{ 
        return B2ITuple(
            std::max(rTupB.getX(), rTupA.getX()),
            std::max(rTupB.getY(), rTupA.getY())); 
	}

	inline B2ITuple absolute(const B2ITuple& rTup) 
	{ 
		B2ITuple aAbs(
			(0 > rTup.getX()) ? -rTup.getX() : rTup.getX(),
			(0 > rTup.getY()) ? -rTup.getY() : rTup.getY()); 
		return aAbs;
	}

	inline B2ITuple interpolate(const B2ITuple& rOld1, const B2ITuple& rOld2, double t) 
	{ 
        if(rOld1 == rOld2)
        {
            return rOld1;
        }
        else if(0.0 >= t)
        {
            return rOld1;
        }
        else if(1.0 <= t)
        {
            return rOld2;
        }
        else
        {
		    return B2ITuple(
			    basegfx::fround(((rOld2.getX() - rOld1.getX()) * t) + rOld1.getX()),
			    basegfx::fround(((rOld2.getY() - rOld1.getY()) * t) + rOld1.getY())); 
        }
	}

	inline B2ITuple average(const B2ITuple& rOld1, const B2ITuple& rOld2) 
	{ 
        return B2ITuple(
            rOld1.getX() == rOld2.getX() ? rOld1.getX() : basegfx::fround((rOld1.getX() + rOld2.getX()) * 0.5),
            rOld1.getY() == rOld2.getY() ? rOld1.getY() : basegfx::fround((rOld1.getY() + rOld2.getY()) * 0.5)); 
	}
	
	inline B2ITuple average(const B2ITuple& rOld1, const B2ITuple& rOld2, const B2ITuple& rOld3)
	{ 
        return B2ITuple(
            (rOld1.getX() == rOld2.getX() && rOld2.getX() == rOld3.getX()) ? rOld1.getX() : basegfx::fround((rOld1.getX() + rOld2.getX() + rOld3.getX()) * (1.0 / 3.0)),
            (rOld1.getY() == rOld2.getY() && rOld2.getY() == rOld3.getY()) ? rOld1.getY() : basegfx::fround((rOld1.getY() + rOld2.getY() + rOld3.getY()) * (1.0 / 3.0))); 
	}

	inline B2ITuple operator+(const B2ITuple& rTupA, const B2ITuple& rTupB)
	{ 
		B2ITuple aSum(rTupA); 
		aSum += rTupB; 
		return aSum; 
	}

	inline B2ITuple operator-(const B2ITuple& rTupA, const B2ITuple& rTupB)
	{ 
		B2ITuple aSub(rTupA); 
		aSub -= rTupB; 
		return aSub; 
	}

	inline B2ITuple operator/(const B2ITuple& rTupA, const B2ITuple& rTupB)
	{ 
		B2ITuple aDiv(rTupA); 
		aDiv /= rTupB; 
		return aDiv; 
	}

	inline B2ITuple operator*(const B2ITuple& rTupA, const B2ITuple& rTupB)
	{ 
		B2ITuple aMul(rTupA); 
		aMul *= rTupB; 
		return aMul; 
	}

	inline B2ITuple operator*(const B2ITuple& rTup, sal_Int32 t)
	{ 
		B2ITuple aNew(rTup); 
		aNew *= t; 
		return aNew; 
	}

	inline B2ITuple operator*(sal_Int32 t, const B2ITuple& rTup)
	{ 
		B2ITuple aNew(rTup); 
		aNew *= t; 
		return aNew; 
	}

	inline B2ITuple operator/(const B2ITuple& rTup, sal_Int32 t)
	{ 
		B2ITuple aNew(rTup); 
		aNew /= t; 
		return aNew; 
	}

	inline B2ITuple operator/(sal_Int32 t, const B2ITuple& rTup)
	{
		B2ITuple aNew(t, t); 
		B2ITuple aTmp(rTup); 
		aNew /= aTmp; 
		return aNew; 
	}
} // end of namespace basegfx

#endif /* _BGFX_TUPLE_B2ITUPLE_HXX */