checkerboardwipe.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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
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 *   ownership. The ASF licenses this file to you under the Apache
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 *   except in compliance with the License. You may obtain a copy of
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#include <basegfx/matrix/b2dhommatrix.hxx>
#include "checkerboardwipe.hxx"
 
 
namespace slideshow::internal {
 
::basegfx::B2DPolyPolygon CheckerBoardWipe::operator () ( double t )
{
    const double d = 1.0 / m_unitsPerEdge;
    ::basegfx::B2DHomMatrix aTransform;
    aTransform.scale( ::basegfx::pruneScaleValue( d * 2.0 * t ),
                      ::basegfx::pruneScaleValue( d ) );
 
    ::basegfx::B2DPolyPolygon res;
    for ( sal_Int32 i = m_unitsPerEdge; i--; )
    {
        ::basegfx::B2DHomMatrix transform( aTransform );
        if ((i % 2) == 1) // odd line
            transform.translate( -d, 0.0 );
        for ( sal_Int32 j = (m_unitsPerEdge / 2) + 1; j--; )
        {
            ::basegfx::B2DPolyPolygon poly( m_unitRect );
            poly.transform( transform );
            res.append( poly );
            transform.translate( d * 2.0, 0.0 );
        }
        aTransform.translate( 0.0, d ); // next line
    }
    return res;
}
 
}
 
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