xref: /trunk/main/basegfx/inc/basegfx/range/basicbox.hxx (revision b63233d8)

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 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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#ifndef _BGFX_RANGE_BASICBOX_HXX
#define _BGFX_RANGE_BASICBOX_HXX

#include <basegfx/range/basicrange.hxx>
#include <basegfx/basegfxdllapi.h>


namespace basegfx
{
    /** Specialization of BasicRange, handling the inside predicates
        differently.

        This template considers the rightmost and bottommost border as
        <em>outside</em> of the range, in contrast to BasicRange,
        which considers them inside.
     */
	class BASEGFX_DLLPUBLIC BasicBox : public BasicRange< sal_Int32, Int32Traits >
	{
        typedef BasicRange< sal_Int32, Int32Traits > Base;
	public:
        BasicBox() :
            Base()
        {
        }

        BasicBox( sal_Int32 nValue ) :
            Base( nValue )
		{
		}

		BasicBox(const BasicBox& rBox) :
            Base( rBox )
		{
		}

		double getCenter() const
		{
			if(isEmpty())
			{
				return 0.0;
			}
			else
			{
				return ((mnMaximum + mnMinimum - 1.0) / 2.0);
			}
		}

        using Base::isInside;

		bool isInside(sal_Int32 nValue) const
		{
			if(isEmpty())
			{
				return false;
			}
			else
			{
				return (nValue >= mnMinimum) && (nValue < mnMaximum);
			}
		}

        using Base::overlaps;

		bool overlaps(const BasicBox& rBox) const
		{
			if(isEmpty())
			{
				return false;
			}
			else
			{
				if(rBox.isEmpty())
				{
					return false;
				}
				else
				{
					return !((rBox.mnMaximum <= mnMinimum) || (rBox.mnMinimum >= mnMaximum));
				}
			}
		}

		void grow(sal_Int32 nValue)
		{
			if(!isEmpty())
			{
				bool bLessThanZero(nValue < 0);

				if(nValue > 0 || bLessThanZero)
				{
					mnMinimum -= nValue;
					mnMaximum += nValue;

					if(bLessThanZero)
					{
						// test if range did collapse
						if(mnMinimum > mnMaximum)
						{
							// if yes, collapse to center
							mnMinimum = mnMaximum = ((mnMaximum + mnMinimum - 1) / 2);
						}
					}
				}
			}
		}
	};

} // end of namespace basegfx

#endif /* _BGFX_RANGE_BASICBOX_HXX */