hmd_calibration.c

#include <stdio.h>
#include "tobii_research_eyetracker.h"
#include "tobii_research_calibration.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 hmd_calibration_example(TobiiResearchEyeTracker* eyetracker) {

    /* Enter calibration mode. */
    TobiiResearchStatus status = tobii_research_hmd_based_calibration_enter_calibration_mode(eyetracker);
    char* serial_number;
    tobii_research_get_serial_number(eyetracker, &serial_number);

    printf("Entered calibration mode for eye tracker with serial number %s \n.", serial_number);

    tobii_research_free_string(serial_number);
    /* Define the points we should calibrate at. */
    /* The coordinates are in HMD coordinates (x,y,z) */
    {
        #define NUM_OF_POINTS  3U

        TobiiResearchPoint3D points_to_calibrate[NUM_OF_POINTS] = \
                {{0.0f, 0.0f, 1000.0f}, {20.0f, 0.0f, 1000.0f}, {0.0f, 20.0f, 1000.0f}};
        size_t i = 0;


        for(; i < NUM_OF_POINTS; i++) {
            TobiiResearchPoint3D* point = &points_to_calibrate[i];
            printf("Show a point on screen at (%f,%f).\n", point->x, point->y);

            //  Wait a little for user to focus.
            sleep_ms(700);

            printf("Collecting data at (%f,%f,%f).\n", point->x, point->y, point->z);
            if (tobii_research_hmd_based_calibration_collect_data(eyetracker, point->x, point->y, point->z) != TOBII_RESEARCH_STATUS_OK) {
                /* Try again if it didn't go well the first time. */
                /* Not all eye tracker models will fail at this point, but instead fail on ComputeAndApply. */
                tobii_research_hmd_based_calibration_collect_data(eyetracker, point->x, point->y, point->z);
            }
        }


        printf("Computing and applying calibration.\n");
        TobiiResearchHMDCalibrationResult calibration_result;
        status = tobii_research_hmd_based_calibration_compute_and_apply(eyetracker, &calibration_result);

        if (status == TOBII_RESEARCH_STATUS_OK) {
            if (calibration_result.status == TOBII_RESEARCH_CALIBRATION_SUCCESS)
                printf("Calibration was successful!\n");
            else if (calibration_result.status == TOBII_RESEARCH_CALIBRATION_FAILURE)
                printf("Calibration failed!\n");
        }

    }
    /* The calibration is done. Leave calibration mode. */
    status = tobii_research_hmd_based_calibration_leave_calibration_mode(eyetracker);

    printf("Left calibration mode.\n");

}