* Copyright 2009, Alexandre Deckner, alex@zappotek.com
* Distributed under the terms of the MIT License.
*/
#ifndef SHAKE_TRACKING_FILTER_H
#define SHAKE_TRACKING_FILTER_H
#include <MessageFilter.h>
#include <Point.h>
class BView;
class BHandler;
class BMessageRunner;
namespace BPrivate {
class LowPassFilter {
public:
LowPassFilter(uint32 size);
~LowPassFilter();
void Input(const BPoint& p);
BPoint Output() const;
private:
BPoint* fPoints;
uint32 fSize;
BPoint fSum;
};
class ShakeTrackingFilter : public BMessageFilter {
public:
ShakeTrackingFilter(
BView* targetView,
uint32 messageWhat,
uint32 countThreshold = 2,
bigtime_t timeTreshold = 400000);
~ShakeTrackingFilter();
filter_result Filter(BMessage* message, BHandler** _target);
private:
BView* fTargetView;
uint32 fMessageWhat;
BMessageRunner* fCancelRunner;
LowPassFilter fLowPass;
BPoint fLastDelta;
BPoint fLastPosition;
uint32 fCounter;
uint32 fCountThreshold;
bigtime_t fTimeThreshold;
};
}
using BPrivate::ShakeTrackingFilter;
using BPrivate::LowPassFilter;
#endif
