Shoot(burstsCount, roundsCount)
{
    for (i = 0; i < burstsCount; i++) // do it burstsCount times
    {
        DrawBullet(sightX, sightY);
        for (k = 0; k < roundsCount; k++) // do it roundsCount times
        {
            ShootBullet();
        }
        Centre(); // set to centre after each burst
    }
}

ShootBullet()
{
    Kick();
    Recovery();
    AddCompensation();
}

// this function kicks sight to random point
Kick()
{
    // random(a, b) returns random number between a and b
    // random(-10, 20) can return -7, 5, 7, 19, -2 etc
    sightX = sightX + random(Xmin, Xmax);
    sightY = sightY + random(Ymin, Ymax);
}

// centerspeed in work
Recovery()
{
    recoverySpeed = CenterSpeed * FireTime/5;

    // |a| is absolute value from a: |-20|=20 and |20|=20
    if (|sightX| < recoverySpeed)
        sightX = 0;
    else if (sight.X < 0)
        sightX += recoverySpeed;
    else if (sight.X > 0)
        sightX -= recoverySpeed;

    if (|sight.Y| < recoverySpeed)
        sightY = 0;
    else if (sight.Y < 0)
        sightY += recoverySpeed;
    else if (sight.Y > 0)
        sightY -= recoverySpeed;
}

// this func returns sight to centre
Centre()
{
    sightX = 0;
    sightY = 0;
}

// manual movement
AddCompensation()
{
    sightX = sightX + compensationX;
    sightY = sightY + compensationY;
}