cruise control by zulao

 																																													/*
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                      Z        ZZ     ZZ     ZZ
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 ZZZZZZZZZZZZZ Z           Z Z             ZZZZZZZZZZZZZ ZZZZZZZZZZZZZ
			ZZ Z           Z Z             Z           Z Z           Z
		   ZZ  Z           Z Z             Z           Z Z           Z
         ZZ    Z           Z Z             Z           Z Z           Z
       ZZ      Z           Z Z             ZZZZZZZZZZZZZ Z           Z
     ZZ        Z           Z Z             Z           Z Z           Z
   ZZ          Z           Z Z             Z           Z Z           Z
 ZZZZZZZZZZZZZ ZZZZZZZZZZZZZ ZZZZZZZZZZZZZ Z           Z ZZZZZZZZZZZZZ
-------------------------------------------------|  @@@@@@@@@@ BY ZULAO @@@@@@@@@@ |---------------------------------------------------------------------------

																							*/
#include <a_samp>
#include <sscanf2>
#include <zcmd>
#undef MAX_PLAYERS
#define MAX_PLAYERS 100
#define UPDATE_RATE 50
#define CCKey	KEY_ACTION

new bool: cc[MAX_PLAYERS char];
new Float: ccspeed[MAX_PLAYERS];

public OnPlayerConnect(playerid)
{
	cc{playerid} = false;
	ccspeed[playerid] = 0.1;
	return 1;
}

CMD:cc(playerid,params[])
{
	new Float: value;
	if(!sscanf(params,"f", value))
 {
	    if(value < 0.05 || value > 0.15) return SendClientMessage(playerid,-1, "Valor da velocidade inválida! Limite de 0.05 até 0.15!");
		ccspeed[playerid] = value;
	    new string[128];
	    format(string,sizeof(string),"Você setou o valor da velocidade para %.2f!", ccspeed[playerid]);
		return SendClientMessage(playerid,-1, string);
 }
	if(cc{playerid})
	{
		cc{playerid} = false;
		return SendClientMessage(playerid,-1, "Você desabilitou o mode de Cruise Control!");
	}
	else
	{
 		cc{playerid} = true;
		return SendClientMessage(playerid,-1, "Você ativou o mode de Cruise Control! Precione a tecla CTRL para andar com o veículo no modo Cruise Control. Use /cc [valor] para alterar a velocidade.");
	}

}

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
	if(cc{playerid})
	{
 		if(newkeys & CCKey) ccf(playerid);
		{
			new Float: x, Float:y, Float:z;
			GetVehicleVelocity(GetPlayerVehicleID(playerid), x, y, z);
		}
	}
	return 1;
}

forward ccf(playerid);
public ccf(playerid)
{
	new keys, ud, lr;
	GetPlayerKeys(playerid, keys, ud, lr);
	if((keys & CCKey))
	{
		new Float: adirection[3];
		new vehid = GetPlayerVehicleID(playerid);
	    new Float:Quaternion[4];
	    new Float:transformationmatrix[4][4];

	    GetVehicleRotationQuat(vehid, Quaternion[0], Quaternion[1], Quaternion[2], Quaternion[3]);

	    new Float:xx = Quaternion[0] * Quaternion[0];
	    new Float:xy = Quaternion[0] * Quaternion[1];
	    new Float:xz = Quaternion[0] * Quaternion[2];
	    new Float:xw = Quaternion[0] * Quaternion[3];
	    new Float:yy = Quaternion[1] * Quaternion[1];
	    new Float:yz = Quaternion[1] * Quaternion[2];
	    new Float:yw = Quaternion[1] * Quaternion[3];
	    new Float:zz = Quaternion[2] * Quaternion[2];
	    new Float:zw = Quaternion[2] * Quaternion[3];

	    transformationmatrix[0][0] = 1 - 2 * ( yy + zz );
	    transformationmatrix[0][1] =     2 * ( xy - zw );
	    transformationmatrix[0][2] =     2 * ( xz + yw );
	    transformationmatrix[0][3] = 0.0;

	    transformationmatrix[1][0] =     2 * ( xy + zw );
	    transformationmatrix[1][1] = 1 - 2 * ( xx + zz );
	    transformationmatrix[1][2] =     2 * ( yz - xw );
	    transformationmatrix[1][3] = 0.0;

	    transformationmatrix[2][0] =     2 * ( xz - yw );
	    transformationmatrix[2][1] =     2 * ( yz + xw );
	    transformationmatrix[2][2] = 1 - 2 * ( xx + yy );
	    transformationmatrix[2][3] = 0;

	    transformationmatrix[3][0] = 0;
	    transformationmatrix[3][1] = 0;
	    transformationmatrix[3][2] = 0;
	    transformationmatrix[3][3] = 1;

	    adirection[2] = -1 * transformationmatrix[0][1] + transformationmatrix[0][3];
	    adirection[1] = -1 * transformationmatrix[1][1] + transformationmatrix[1][3];
	    adirection[0] = -(-1 * transformationmatrix[2][1] + transformationmatrix[2][3]);

		SetVehicleVelocity(vehid, adirection[0]*ccspeed[playerid], adirection[1]*ccspeed[playerid], adirection[2]*ccspeed[playerid]);
		SetTimerEx("ccf", UPDATE_RATE, false, "i", playerid);
	}
}