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/*************************************************************************
*
* 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: randomwipe.cxx,v $
* $Revision: 1.7 $
*
* 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_slideshow.hxx"
#include <canvas/debug.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/numeric/ftools.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include "randomwipe.hxx"
#include "tools.hxx"
namespace slideshow {
namespace internal {
RandomWipe::RandomWipe( sal_Int32 nElements, bool randomBars )
: m_positions( new ::basegfx::B2DPoint[ nElements ] ),
m_nElements( nElements ),
m_rect( createUnitRect() )
{
::basegfx::B2DHomMatrix aTransform;
if (randomBars)
{
double edge = (1.0 / nElements);
for ( sal_Int32 pos = nElements; pos--; )
m_positions[ pos ].setY( ::basegfx::pruneScaleValue( pos * edge ) );
aTransform.scale( 1.0, ::basegfx::pruneScaleValue(edge) );
}
else // dissolve effect
{
sal_Int32 sqrtElements = static_cast<sal_Int32>(
sqrt( static_cast<double>(nElements) ) );
double edge = (1.0 / sqrtElements);
for ( sal_Int32 pos = nElements; pos--; ) {
m_positions[ pos ] = ::basegfx::B2DPoint(
::basegfx::pruneScaleValue( (pos % sqrtElements) * edge ),
::basegfx::pruneScaleValue( (pos / sqrtElements) * edge ) );
}
const double pedge = ::basegfx::pruneScaleValue(edge);
aTransform.scale( pedge, pedge );
}
m_rect.transform( aTransform );
// mix up:
for ( sal_Int32 i = (nElements / 2); i--; )
{
const sal_Int32 pos1 = getRandomOrdinal(nElements);
const sal_Int32 pos2 = getRandomOrdinal(nElements);
const ::basegfx::B2DPoint point( m_positions[ pos1 ] );
m_positions[ pos1 ] = m_positions[ pos2 ];
m_positions[ pos2 ] = point;
}
}
::basegfx::B2DPolyPolygon RandomWipe::operator () ( double t )
{
::basegfx::B2DPolyPolygon res;
for ( sal_Int32 pos = static_cast<sal_Int32>(t * m_nElements); pos--; )
{
::basegfx::B2DPoint const & point = m_positions[ pos ];
::basegfx::B2DPolygon poly( m_rect );
poly.transform(basegfx::tools::createTranslateB2DHomMatrix(point.getX(), point.getY()));
res.append( poly );
}
return res;
}
}
}
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