stroke.h

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#pragma once
 
#include "gesturelib.h"
#include "recognizer.h"
 
#ifndef STROKE_CACHE_SIZE
// needs to be at least 2 in order to calculate velocity
#define STROKE_CACHE_SIZE 30
#endif
 
typedef struct stroke {
    // recognizer state
    state_t state;
 
    // touch event group
    unsigned int group;
    // user id
    int uid;
 
    // initial position and time
    float x0;
    float y0;
    float t0;
 
    // current position and time
    float x;
    float y;
    float t;
 
    // moving average velocity
    float vx;
    float vy;
 
    // instantaneous velocity cache
    int cache_last;
    int cache_size;
    float cache_vy[STROKE_CACHE_SIZE];
    float cache_vx[STROKE_CACHE_SIZE];
} stroke_t;
 
void init_stroke();
 
void recognize_stroke(const touch_event_t* event);
 
const stroke_t* get_stroke();