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 * 
 * 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
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_slideshow.hxx"

#include <canvas/debug.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include "checkerboardwipe.hxx"


namespace slideshow {
namespace 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;
}

}
}