Automatic Velocity

//BY ADRI1
#include <a_samp>
new speed123[MAX_PLAYERS];
new timer[MAX_PLAYERS];
#define FILTERSCRIPT
#if defined FILTERSCRIPT


public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if(oldstate == PLAYER_STATE_DRIVER && newstate == PLAYER_STATE_ONFOOT)
    {
        if(GetPVarInt(playerid, "automaticspeed"))
        {
            KillTimer(timer[playerid]);
            speed123[playerid] = 0;
            DeletePVar(playerid, "automaticspeed");
            GameTextForPlayer(playerid, "~g~AV:~r~  OFF", 500, 1);
        }
    }
    return 1;
}


public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys & KEY_FIRE)
    {
        if(!IsPlayerInAnyVehicle(playerid)) return 1;
        if(GetPlayerState(playerid) != PLAYER_STATE_DRIVER) return 1;
        if(!GetPVarInt(playerid, "automaticspeed"))
        {
            speed123[playerid] = GetPlayerSpeed(playerid,false);
            if(speed123[playerid] == 0) return 1;
            timer[playerid] = SetTimerEx("asd",100,1,"i",playerid);
            SetPVarInt(playerid,"automaticspeed" , true);
            GameTextForPlayer(playerid, "~r~AV:~g~  ON", 500, 1);
        }
        else
        {
            KillTimer(timer[playerid]);
            speed123[playerid] = 0;
            DeletePVar(playerid, "automaticspeed");
            GameTextForPlayer(playerid, "~g~AV:~r~  OFF", 500, 1);
        }
    }
    return 1;
}
forward asd(playerid);public asd(playerid)
{
    if(GetPVarInt(playerid, "automaticspeed"))
    {
        new Keys,ud,lr;
        GetPlayerKeys(playerid,Keys,ud,lr);

        if(Keys & KEY_HANDBRAKE || Keys & KEY_DOWN) KillTimer(timer[playerid]), DeletePVar(playerid, "automaticspeed") ,GameTextForPlayer(playerid, "~g~AV:~r~  OFF", 500, 1);
        SetVehicleSpeed(GetPlayerVehicleID(playerid),speed123[playerid]);
    }
    return 1;
}
stock SetVehicleSpeed(vehicleid,mph)
{
    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)
    {
        multiple = (mph / (DV * 100));
        return SetVehicleVelocity(vehicleid,Vx*multiple,Vy*multiple,Vz*multiple);
    }
    return 0;
}
stock GetPlayerSpeed(playerid,bool:kmh)
{
    new Float:Vx,Float:Vy,Float:Vz,Float:rtn;
    if(IsPlayerInAnyVehicle(playerid)) GetVehicleVelocity(GetPlayerVehicleID(playerid),Vx,Vy,Vz); else GetPlayerVelocity(playerid,Vx,Vy,Vz);
    rtn = floatsqroot(floatabs(floatpower(Vx + Vy + Vz,2)));
    return kmh?floatround(rtn * 100 * 1.61):floatround(rtn * 100);
}
#endif