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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_PARAMETRICPOLYPOLYGON_HXX
#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_PARAMETRICPOLYPOLYGON_HXX
#include <basegfx/polygon/b2dpolypolygon.hxx>
#include <memory>
/* 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 ::std::shared_ptr< ParametricPolyPolygon > ParametricPolyPolygonSharedPtr;
}
}
#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_PARAMETRICPOLYPOLYGON_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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