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#ifndef GrTouchGesture_DEFINED
#define GrTouchGesture_DEFINED
#include "GrTypes.h"
#include "SkTDArray.h"
#include "SkMatrix.h"
#include "FlingState.h"
class GrTouchGesture {
public:
GrTouchGesture();
~GrTouchGesture();
void touchBegin(void* owner, float x, float y);
void touchMoved(void* owner, float x, float y);
void touchEnd(void* owner);
void reset();
const SkMatrix& localM();
const SkMatrix& globalM() const { return fGlobalM; }
private:
enum State {
kEmpty_State,
kTranslate_State,
kZoom_State,
};
struct Rec {
void* fOwner;
float fStartX, fStartY;
float fPrevX, fPrevY;
float fLastX, fLastY;
SkMSec fPrevT, fLastT;
};
SkTDArray<Rec> fTouches;
State fState;
SkMatrix fLocalM, fGlobalM;
FlingState fFlinger;
SkMSec fLastUpT;
SkPoint fLastUpP;
void flushLocalM();
int findRec(void* owner) const;
void appendNewRec(void* owner, float x, float y);
float computePinch(const Rec&, const Rec&);
float limitTotalZoom(float scale) const;
bool handleDblTap(float, float);
};
#endif
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