1 #ifndef SkTouchGesture_DEFINED 2 #define SkTouchGesture_DEFINED 3 4 #include "SkTDArray.h" 5 #include "SkMatrix.h" 6 7 struct SkFlingState { 8 SkFlingState() : fActive(false) {} 9 10 bool isActive() const { return fActive; } 11 void stop() { fActive = false; } 12 13 void reset(float sx, float sy); 14 bool evaluateMatrix(SkMatrix* matrix); 15 16 private: 17 SkPoint fDirection; 18 SkScalar fSpeed0; 19 double fTime0; 20 bool fActive; 21 }; 22 23 class SkTouchGesture { 24 public: 25 SkTouchGesture(); 26 ~SkTouchGesture(); 27 28 void touchBegin(void* owner, float x, float y); 29 void touchMoved(void* owner, float x, float y); 30 void touchEnd(void* owner); 31 void reset(); 32 33 bool isActive() { return fFlinger.isActive(); } 34 void stop() { fFlinger.stop(); } 35 36 const SkMatrix& localM(); 37 const SkMatrix& globalM() const { return fGlobalM; } 38 39 private: 40 enum State { 41 kEmpty_State, 42 kTranslate_State, 43 kZoom_State, 44 }; 45 46 struct Rec { 47 void* fOwner; 48 float fStartX, fStartY; 49 float fPrevX, fPrevY; 50 float fLastX, fLastY; 51 SkMSec fPrevT, fLastT; 52 }; 53 SkTDArray<Rec> fTouches; 54 55 State fState; 56 SkMatrix fLocalM, fGlobalM; 57 SkFlingState fFlinger; 58 SkMSec fLastUpT; 59 SkPoint fLastUpP; 60 61 62 void flushLocalM(); 63 int findRec(void* owner) const; 64 void appendNewRec(void* owner, float x, float y); 65 float computePinch(const Rec&, const Rec&); 66 float limitTotalZoom(float scale) const; 67 bool handleDblTap(float, float); 68 }; 69 70 #endif 71 72 73
