void bug(Mat image) {
    Mat tmp(image.rows, image.cols, CV_8UC1, Scalar(255));
    int startx = 0;
    int starty = 0;
    int posx;
    int posy;

    while (image.at<uchar>(starty, startx) != 255) {
        startx++;
        if (startx > image.cols - 1) {
            startx = 0;
            starty++;
        }
    }
    startx--;
    tmp.at<uchar>(starty, startx) = 0;
#define RIGTH 1
#define LEFT -1
    int dir = RIGTH;
    posx = startx;
    posy = starty;
    int movx = 1;
    int movy = 0;
    do {

        posx += movx;
        posy -= movy;
        /*if (posx > image.cols - 1)
        {
            posx = 0;
            posy++;
        }
        if (posx == 256 || posy == 256)
        {
            break;
        }*/
        tmp.at<uchar>(posy, posx) = 0;

        if (image.at<uchar>(posy, posx) == 255) {
            dir = LEFT;
            if (movx == 1 && movy == 0) {
                movx = 0;
                movy = 1;
            } else if (movx == 0 && movy == 1) {
                movx = -1;
                movy = 0;
            } else if (movx == -1 && movy == 0) {
                movx = 0;
                movy = -1;
            } else if (movx == 0 && movy == -1) {
                movx = 1;
                movy = 0;
            }

        } else {
            dir = RIGTH;
            if (movx == 1 && movy == 0) {
                movx = 0;
                movy = -1;
            } else if (movx == 0 && movy == 1) {
                movx = 1;
                movy = 0;
            } else if (movx == -1 && movy == 0) {
                movx = 0;
                movy = 1;
            } else if (movx == 0 && movy == -1) {
                movx = -1;
                movy = 0;
            }
        }

    } while (!(posx == startx && posy == starty && dir == RIGTH));

    imshow("Bug", tmp);
}