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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 */ |