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/* Copyright (C) 2010 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef INCLUDED_FREQUENCY_FILTER
#define INCLUDED_FREQUENCY_FILTER
// calculate frequency of events (tuned for 100 Hz)
struct IFrequencyFilter
{
virtual ~IFrequencyFilter() {}
virtual void Update(double value) = 0;
// smoothed but rapidly tracked frequency
virtual double SmoothedFrequency() const = 0;
// stable, non-fluctuating value for user display
virtual int StableFrequency() const = 0;
};
typedef shared_ptr<IFrequencyFilter> PIFrequencyFilter;
// expectedFrequency is a guess that hopefully speeds up convergence
LIB_API PIFrequencyFilter CreateFrequencyFilter(double resolution, double expectedFrequency);
#endif // #ifndef INCLUDED_FREQUENCY_FILTER
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