AOO410/main/slideshow/source/engine/transitions/snakewipe.hxx

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#if ! defined INCLUDED_SLIDESHOW_SNAKEWIPE_HXX
#define INCLUDED_SLIDESHOW_SNAKEWIPE_HXX

#include "parametricpolypolygon.hxx"

#include <basegfx/numeric/ftools.hxx>
#include <basegfx/point/b2dpoint.hxx>


namespace slideshow {
namespace internal {

/// Generates a snake wipe:
class SnakeWipe : public ParametricPolyPolygon
{
public:
    SnakeWipe( sal_Int32 nElements, bool diagonal, bool flipOnYAxis );
    virtual ::basegfx::B2DPolyPolygon operator () ( double t );

protected:
    // topLeftHorizontal:
    ::basegfx::B2DPolyPolygon calcSnake( double t ) const;
    // topLeftDiagonal:
    ::basegfx::B2DPolyPolygon calcHalfDiagonalSnake( double t, bool in ) const;
    
    const sal_Int32 m_sqrtElements;
    const double m_elementEdge;
    const bool m_diagonal;
    const bool m_flipOnYAxis;
};

/// Generates a parallel snakes wipe:
class ParallelSnakesWipe : public SnakeWipe
{
public:
    ParallelSnakesWipe( sal_Int32 nElements,
                        bool diagonal, bool flipOnYAxis, bool opposite )
        : SnakeWipe( nElements, diagonal, flipOnYAxis ),
          m_opposite( opposite )
        {}
    virtual ::basegfx::B2DPolyPolygon operator () ( double t );
private:
    const bool m_opposite;
};

}
}

#endif /* INCLUDED_SLIDESHOW_SNAKEWIPE_HXX */