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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: canvastools.hxx,v $
* $Revision: 1.10 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_basegfx.hxx"
#include "basegfx/tools/keystoplerp.hxx"
#include <com/sun/star/uno/Sequence.hxx>
#include <algorithm>
static void validateInput(const std::vector<double>& rKeyStops)
{
(void)rKeyStops;
#ifdef DBG_UTIL
OSL_ENSURE( rKeyStops.size() > 1,
"KeyStopLerp::KeyStopLerp(): key stop vector must have two entries or more" );
// rKeyStops must be sorted in ascending order
for( ::std::size_t i=1, len=rKeyStops.size(); i<len; ++i )
{
if( rKeyStops[i-1] > rKeyStops[i] )
OSL_ENSURE( false,
"KeyStopLerp::KeyStopLerp(): time vector is not sorted in ascending order!" );
}
#endif
}
namespace basegfx
{
namespace tools
{
KeyStopLerp::KeyStopLerp( const std::vector<double>& rKeyStops ) :
maKeyStops(rKeyStops),
mnLastIndex(0)
{
validateInput(maKeyStops);
}
KeyStopLerp::KeyStopLerp( const ::com::sun::star::uno::Sequence<double>& rKeyStops ) :
maKeyStops(rKeyStops.getLength()),
mnLastIndex(0)
{
std::copy( rKeyStops.getConstArray(),
rKeyStops.getConstArray()+rKeyStops.getLength(),
maKeyStops.begin() );
validateInput(maKeyStops);
}
KeyStopLerp::ResultType KeyStopLerp::lerp(double fAlpha) const
{
// cached value still okay?
if( maKeyStops.at(mnLastIndex) < fAlpha ||
maKeyStops.at(mnLastIndex+1) >= fAlpha )
{
// nope, find new index
mnLastIndex = std::min<std::ptrdiff_t>(
maKeyStops.size()-2,
// range is ensured by max below
std::max<std::ptrdiff_t>(
0,
std::distance( maKeyStops.begin(),
std::lower_bound( maKeyStops.begin(),
maKeyStops.end(),
fAlpha )) - 1 ));
}
// lerp between stop and stop+1
const double fRawLerp=
(fAlpha-maKeyStops.at(mnLastIndex)) /
(maKeyStops.at(mnLastIndex+1) - maKeyStops.at(mnLastIndex));
// clamp to permissible range (input fAlpha might be
// everything)
return ResultType(
mnLastIndex,
clamp(fRawLerp,0.0,1.0));
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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