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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: parametricpolypolygon.hxx,v $
* $Revision: 1.6 $
*
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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#ifndef INCLUDED_SLIDESHOW_PARAMETRICPOLYPOLYGON_HXX
#define INCLUDED_SLIDESHOW_PARAMETRICPOLYPOLYGON_HXX
#include <basegfx/polygon/b2dpolypolygon.hxx>
#include <boost/shared_ptr.hpp>
/* Definition of ParametricPolyPolygon interface */
namespace slideshow
{
namespace internal
{
/** Interface defining a parametric poly-polygon.
This interface defines a poly-polygon, whose actual shape
is parameterized by a floating point value. This is
e.g. used to generically access the various clip polygon
generators for transition effects.
Since for every parametric poly-polygon, there is a set of
variations, which can easily be generated by simple
transformations or change in parameter range sweep
direction, objects implementing this interface only
generate <em>one</em> prototypical instance of the
parametric poly-polygon. Generally speaking, the main
effect direction should be horizontal, it should make
increasingly more area visible (transition 'in'), and when
there is a designated direction given, that should be
left-to-right.
*/
class ParametricPolyPolygon
{
public:
virtual ~ParametricPolyPolygon() {}
/** Retrieve the poly-polygon for value t.
@param t
Current parameter value to retrieve the corresponding
poly-polygon for. Permissible values for t must be in
the range [0,1].
@return a poly-polygon corresponding to the given
parameter value. The poly-polygon is interpreted as
living in the unit rectangle (i.e. [0,1]x[0,1]), but
is not necessarily constrained to completely lie in
this area (this very much depends on the actual effect
to be generated). Although, from a performance
perspective, it currently <em>is</em> advantageous to
try to keep the poly-polygon within these bounds (at
least if there are no hard reasons not to do so),
because then reversion or out transformations are
potentially faster to compute (see the
TransitionInfo::meReverseMethod member in
transitionfactory.cxx). Furthermore, if one of the
polygon modifications involve subtraction (also see
TransitionInfo::meReverseMethod), all generated
polygons should be oriented clock-wise
(i.e. traversing the polygon vertices with increasing
vertex index should generate a clock-wise movement).
*/
virtual ::basegfx::B2DPolyPolygon operator()( double t ) = 0;
};
typedef ::boost::shared_ptr< ParametricPolyPolygon > ParametricPolyPolygonSharedPtr;
}
}
#endif /* INCLUDED_SLIDESHOW_PARAMETRICPOLYPOLYGON_HXX */
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