zoom.h

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#pragma once
 
#include "gesturelib.h"
#include "recognizer.h"
 
typedef struct zoom {
    // recognizer state
    state_t state;
    // user id of tracked group
    int uid;
    // number of tracked strokes
    int size;
    // scale factor
    float scale;
    // has zoomed at some point during the gesture
    char zoomed;
} zoom_t;
 
void init_zoom();
 
void recognize_zoom(const touch_event_t* event);
 
const zoom_t* get_zoom();
 
int set_on_zoom(void (*listener)(const zoom_t*));