drag.h

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#pragma once
 
#include "gesturelib.h"
#include "recognizer.h"
 
typedef struct drag {
    // recognizer state
    state_t state;
 
    // tracked touch event group
    int group;
 
    // initial position
    float x0;
    float y0;
 
    // current position
    float x;
    float y;
 
    // current velocity
    float vx;
    float vy;
} drag_t;
 
void init_drag();
 
void recognize_drag(const touch_event_t* event);
 
const drag_t* get_drag();
 
int set_on_drag(void (*listener)(const drag_t*));