AOO410/main/slideshow/source/engine/transitions/doublediamondwipe.cxx

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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 <basegfx/point/b2dpoint.hxx>
#include "doublediamondwipe.hxx"


namespace slideshow {
namespace internal {

::basegfx::B2DPolyPolygon DoubleDiamondWipe::operator () ( double t )
{
    // outer:
    const double a = ::basegfx::pruneScaleValue( 0.25 + (t * 0.75) );
    ::basegfx::B2DPolygon poly;
    poly.append( ::basegfx::B2DPoint( 0.5 + a, 0.5 ) );
    poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - a ) );
    poly.append( ::basegfx::B2DPoint( 0.5 - a, 0.5 ) );
    poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + a ) );
    poly.setClosed(true);
    ::basegfx::B2DPolyPolygon res(poly);

    // inner (reverse order to clip):
    const double b = ::basegfx::pruneScaleValue( (1.0 - t) * 0.25 );
    poly.clear();
    poly.append( ::basegfx::B2DPoint( 0.5 + b, 0.5 ) );
    poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + b ) );
    poly.append( ::basegfx::B2DPoint( 0.5 - b, 0.5 ) );
    poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - b ) );
    poly.setClosed(true);
    res.append(poly);
    
    return res;
}

}
}