62 lines
2 KiB
C++
62 lines
2 KiB
C++
/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2008 by Sun Microsystems, Inc.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: lerp.hxx,v $
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* $Revision: 1.6 $
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#ifndef INCLUDED_SLIDESHOW_LERP_HXX
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#define INCLUDED_SLIDESHOW_LERP_HXX
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#include <sal/types.h>
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namespace slideshow
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{
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namespace internal
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{
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/** Generic linear interpolator
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@tpl ValueType
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Must have operator+ and operator* defined, and should
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have value semantics.
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@param t
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As usual, t must be in the [0,1] range
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*/
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template< typename ValueType > ValueType lerp( const ValueType& rFrom,
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const ValueType& rTo,
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double t )
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{
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// This is only to suppress a double->int warning. All other
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// types should be okay here.
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return static_cast<ValueType>( (1.0-t)*rFrom + t*rTo );
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}
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}
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}
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#endif /* INCLUDED_SLIDESHOW_LERP_HXX */
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