Dalek / BotW Guardian NPC Script (v0.3) for 2.55

///////////////////////
/// THE DALEKS      ///
/// NPC Script      ///
/// For ZC 2.55     ///
/// v0.3            ///
/// 7th March, 2019 ///
///////////////////////


npc script Dalek
{
    const int LASER_LAYER       = 3;
    const int LASER_COLOUR      = 0x04;
    const int LASER_OPACITY     = 128;
    const int ANGLE_VISION      = 60;
    const int SHOT_STEP     = 120;
    const int COODOWN       = 150;
    const int WTYPE         = EW_SCRIPT1;
    const int SHOT_SFX      = 70;

    void run (int angleOfVision, int shotStep, int shotCooldownTime, int weaponType, int shotSFX)
    {
        //Get attributes
        angleOfVision = (this->InitD[0] > 0 ) ? this->InitD[0] : ANGLE_VISION;
        shotStep = (this->InitD[1]] > 0 ) ? this->InitD[1]] : SHOT_STEP;
        shotCooldownTime = (this->InitD[2] > 0 ) ? this->InitD[2] : COODOWN;
        weaponType = (ghost->InitD[3] > 0 ) ? ghost->InitD[3] : WTYPE;
        shotSFX = (ghost->InitD[4] > 0 ) ? ghost->InitD[4]: SHOT_SFX;

        int laserStartX;
        int laserStartY;

        eweapon beam;

        while(this->isValid())
        {
            //Shooting
            if ( shotCooldownTime > 0 )
                --shotCooldownTime;
            //Only one beam at a time
            else if ( !beam->isValid() )
            {
                //Check angle to Link against angle of vision
                //If Link is within this angle
                if ( (Abs((Angle(CenterX(this), CenterY(this), CenterLinkX(), CenterLinkY())) - (Dir4Angle(this->Dir)))) <= angleOfVision/2 )
                {
                    shotCooldownTime = (this->InitD[2] > 0 ) ? this->InitD[2] : COODOWN; //can reduce down by reading InitD again -Z

                    laserStartX = CenterX(this);
                    laserStartY = CenterY(this);


                    beam = Screen->CreateEWeapon(weaponType);
                    beam->X = laserStartX;
                    beam->Y = laserStartY;
                    beam->Angular = true;
                    beam->Angle = ArcTan(Link->X-beam->X, Link->Y-beam->X);
                    beam->Step = shotStep;
                    beam->Damage = this->WeaponDamage;
                    Audio->PlaySound(shotSFX);
                    beam->DrawXOffset = 999; //Draw off-screen
                }
            }

            //Draw laser beam
            if ( beam->isValid() )
            {
                Screen->Line(LASER_LAYER, laserStartX, laserStartY, CenterX(beam), CenterY(beam), LASER_COLOUR, 1, 0, 0, 0, LASER_OPACITY);
            }

            Waitframe();
        }
    }
}