Vanter's vehicle control

new Speedlimit[MAX_PLAYERS];
#define SpeedCheck(%0,%1,%2,%3,%4) floatround(floatsqroot(%4?(%0*%0+%1*%1+%2*%2):(%0*%0+%1*%1) ) *%3*1.6)
//Under OnGameModeInIt
	ManualVehicleEngineAndLights();
//======================================Stocks=======================================//

//Vehicle speed
stock GetVehicleSpeed(vehicleid, get3d)
{
        new Float:x, Float:y, Float:z;
        GetVehicleVelocity(vehicleid, x, y, z);
        return SpeedCheck(x, y, z, 100.0, get3d);
}
stock ModifyVehicleSpeed(vehicleid,mph) //Miles Per Hour
{
        new Float:Vx,Float:Vy,Float:Vz,Float:DV,Float:multiple;
        GetVehicleVelocity(vehicleid,Vx,Vy,Vz);
        DV = floatsqroot(Vx*Vx + Vy*Vy + Vz*Vz);
        if(DV > 0) //Directional velocity must be greater than 0 (display strobes if 0)
        {
                multiple = ((mph + DV * 100) / (DV * 100)); //Multiplying DV by 100 calculates speed in MPH
                return SetVehicleVelocity(vehicleid,Vx*multiple,Vy*multiple,Vz*multiple);
        }
        return 0;
}
//================================================Commands=============================================//

//------------------------------Vehicle commands------------------------------//
CMD:speed(playerid, params[])
{
    new string[128], speed;
    if(sscanf(params, "i", speed)) return SendClientMessage(playerid, COLOR_ERROR, "[USAGE] /speed (MPH)");
	if(speed < 0) return SendClientMessage(playerid, COLOR_RED, "[ERROR] invalid MPH speed.");
    Speedlimit[playerid] = speed;
    if(speed == 0) format(string, sizeof(string), "[VEHICLE] You have turned your speed limit off.", speed);
    else format(string, sizeof(string), "[VEHICLE] You have set your speed limit to %d MPH.", speed);
    SendClientMessage(playerid, COLOR_YELLOW, string);
    return 1;
}

CMD:engine(playerid, params[])
{
    #pragma unused params
    new vehicleid, engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in a vehicle in order to use this command.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in the driver seat in order to use this command.");
      if(engine == 1)
      {
        SetVehicleParamsEx(vehicleid,0,lights,alarm,doors,bonnet,boot,objective);
        SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Engine shut off.");
      }
      else
      {
        SetVehicleParamsEx(vehicleid,1,lights,alarm,doors,bonnet,boot,objective);
        SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Engine started.");
      }
    return 1;
}

CMD:lights(playerid, params[])
{
	#pragma unused params
    new vehicleid, engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in a vehicle in order to use this command.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in the driver seat in order to use this command.");
    if(lights == 1)
    {
        SetVehicleParamsEx(vehicleid,engine,0,alarm,doors,bonnet,boot,objective);
		SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] lights turned off.");
    }
    else
    {
        SetVehicleParamsEx(vehicleid,engine,1,alarm,doors,bonnet,boot,objective);
		SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] lights turned on.");
    }
    return 1;
}

CMD:bonnet(playerid, params[])
{
	#pragma unused params
    new vehicleid, engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in a vehicle in order to use this command.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in the driver seat in order to use this command.");
    if(bonnet == 1)
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,0,boot,objective);
		SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Bonnet closed.");
    }
    else
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,1,boot,objective);
		SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Bonnet opened.");
    }
    return 1;
}

CMD:boot(playerid, params[])
{
	#pragma unused params
    new vehicleid, engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in a vehicle in order to use this command.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_RED, "[ERROR] You must be in the driver seat in order to use this command.");
    if(boot == 1)
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,0,objective);
		SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Boot closed.");
    }
    else
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,1,objective);
		SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Boot opened.");
    }
    return 1;
}

CMD:lock(playerid, params[])
{
	#pragma unused params
	if(IsPlayerInAnyVehicle(playerid))
    {
       new State=GetPlayerState(playerid);
       if(State!=PLAYER_STATE_DRIVER)
       {
           SendClientMessage(playerid,COLOR_RED,"[ERROR] You must be in the driver's seat in order to use this command.");
           return 1;
       }
       new i;
       for(i=0;i<MAX_PLAYERS;i++)
       {
           if(i != playerid)
           {
               SetVehicleParamsForPlayer(GetPlayerVehicleID(playerid),i, 0, 1);
           }
       }
       SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Vehicle locked.");
       new Float:pX, Float:pY, Float:pZ;
       GetPlayerPos(playerid,pX,pY,pZ);
       PlayerPlaySound(playerid,1056,pX,pY,pZ);
    }
    else
    {
        SendClientMessage(playerid, COLOR_RED,"[ERROR] You must be in a vehicle in order to use this command.");
    }
    return 1;
}

CMD:unlock(playerid, params[])
{
	#pragma unused params
	if(IsPlayerInAnyVehicle(playerid))
    {
       new State=GetPlayerState(playerid);
       if(State!=PLAYER_STATE_DRIVER)
       {
           SendClientMessage(playerid,COLOR_RED,"[ERROR] You must be in the driver's seat in order to use this command.");
           return 1;
       }
       new i;
       for(i=0;i<MAX_PLAYERS;i++)
       {
           SetVehicleParamsForPlayer(GetPlayerVehicleID(playerid),i, 0, 0);
       }
       SendClientMessage(playerid, COLOR_YELLOW, "[VEHICLE] Vehicle unlocked.");
       new Float:pX, Float:pY, Float:pZ;
       GetPlayerPos(playerid,pX,pY,pZ);
       PlayerPlaySound(playerid,1057,pX,pY,pZ);
    }
    else
    {
        SendClientMessage(playerid, COLOR_RED,"[ERROR] You must be in a vehicle in order to use this command.");
    }
    return 1;
}
///====================================================================================///
//Under ONPlayerUpdate

    if(GetPlayerState(playerid) == PLAYER_STATE_DRIVER && Speedlimit[playerid])
    {
      new a, b, c;
      GetPlayerKeys(playerid, a, b ,c);
      if(a == 8 && GetVehicleSpeed(GetPlayerVehicleID(playerid), 0) > Speedlimit[playerid])
      {
         new newspeed = GetVehicleSpeed(GetPlayerVehicleID(playerid), 0) - Speedlimit[playerid];
         ModifyVehicleSpeed(GetPlayerVehicleID(playerid), -newspeed);
      }
    }

//Thank you