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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_INC_EXPRESSIONNODE_HXX
#define INCLUDED_SLIDESHOW_SOURCE_INC_EXPRESSIONNODE_HXX
/* Definition of ExpressionNode interface */
namespace slideshow
{
namespace internal
{
/** Interface describing an abstract animation function.
Use this interface to model time-dependent animation
functions of one variable.
*/
class AnimationFunction
{
public:
virtual ~AnimationFunction() {}
/** Operator to calculate function value.
This method calculates the function value for the
given time instant t.
@param t
Current time instant, must be in the range [0,1]
@return the function value, typically in relative
user coordinate space ([0,1] range).
*/
virtual double operator()( double t ) const = 0;
};
/** Refinement of AnimationFunction
This interface is used by the SMIL function parser, to
collapse constant values into precalculated, single nodes.
*/
class ExpressionNode : public AnimationFunction
{
public:
/** Predicate whether this node is constant.
This predicate returns true, if this node is
neither time- nor ViewInfo dependent. This allows
for certain optimizations, i.e. not the full
expression tree needs be represented by
ExpressionNodes.
@returns true, if this node is neither time- nor
ViewInfo dependent
*/
virtual bool isConstant() const = 0;
};
}
}
#endif // INCLUDED_SLIDESHOW_SOURCE_INC_EXPRESSIONNODE_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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