user_position_guide.c

#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "tobii_research_eyetracker.h"
#include "tobii_research_streams.h"

#if _WIN32 || _WIN64
#include <windows.h>
static void sleep_ms(int time) {
    Sleep(time);
}
#else
#include <unistd.h>
static void sleep_ms(int time) {
    usleep(time * 1000);
}
#endif


void user_position_guide_callback(TobiiResearchUserPositionGuide* user_position_guide, void* user_data) {
    memcpy(user_data, user_position_guide, sizeof(*user_position_guide));
}

void user_position_guide_example(TobiiResearchEyeTracker* eyetracker) {


    TobiiResearchUserPositionGuide user_position_guide;
    char* serial_number;
    tobii_research_get_serial_number(eyetracker, &serial_number);

    printf("Subscribing to user position guide for eye tracker with serial number %s.\n", serial_number);

    tobii_research_free_string(serial_number);

    TobiiResearchStatus status = tobii_research_subscribe_to_user_position_guide(eyetracker,
            user_position_guide_callback, &user_position_guide);

    if (status != TOBII_RESEARCH_STATUS_OK)
        return;

    /* Wait while some user position guide is collected. */
    sleep_ms(2000);

    status = tobii_research_unsubscribe_from_user_position_guide(eyetracker, user_position_guide_callback);
    printf("Unsubscribed from user position guide with status %i.\n", status);

    printf("Last received gaze package:\n");

    printf("Left eye 3D gaze point user position: (%f, %f, %F)\n",
            user_position_guide.left_eye.user_position.x,
            user_position_guide.left_eye.user_position.y,
            user_position_guide.left_eye.user_position.z);

    printf("Right eye 3D gaze point user position: (%f, %f, %f)\n",
            user_position_guide.right_eye.user_position.x,
            user_position_guide.right_eye.user_position.y,
            user_position_guide.right_eye.user_position.z);

    /* Wait while some data is collected. */
    sleep_ms(2000);
}