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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
#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 pos1 = nElements ; pos1-- ; )
{
const sal_Int32 pos2 = getRandomOrdinal(pos1+1);
::std::swap(m_positions[ pos1], m_positions[ pos2 ]);
}
}
::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;
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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