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module com { module sun { module star { module rendering {

/** Interface to a dynamic poly-polygon generator, that generates
    poly-polygons depending on a given parameter value.<p>

    The returned poly-polygon should normally be contained in the
    [0,1]x[0,1] rectangle. At least that is the dimension expected at
    other places. e.g. Texture.
 */
interface XParametricPolyPolygon2D : ::com::sun::star::uno::XInterface
{
    /** Query the polygonal outline at the specified value.

        The returned outline should be clipped to the [0,1]x[0,1]
        rectangle.

        @param t
        Parameter value in the range [0,1]. During painting, this
        range is swept through starting from 0. When using such a
        parametric poly-polygon for gradients, the area covered by the
        returned XPolyPolygon2D should be monotonically decreasing
        with t (unless singularities in e.g. the resulting gradient
        are desired).
     */
    XPolyPolygon2D              getOutline( [in] double t )
        raises (com::sun::star::lang::IllegalArgumentException);


    /** Query the color value for the polygonal area at the specified
        parameter value.

        @param t
        Parameter value in the range [0,1]. During painting, this
        range is swept through starting from 0.
     */
    sequence<ColorComponent>    getColor( [in] double t )
        raises (com::sun::star::lang::IllegalArgumentException);


    /** Query the color for a dedicated point in the plane.

        @param point
        The permissible parameter range for point is [0,1]x[0,1]
     */
    sequence<ColorComponent>    getPointColor( [in] ::com::sun::star::geometry::RealPoint2D point )
        raises (com::sun::star::lang::IllegalArgumentException);


    /** Query the color space employed by this object

        @return the color space the colors generated by this object
        are to be interpreted in.
     */
    XColorSpace                 getColorSpace();

};

}; }; }; };

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