Swat's cannon like rhino's

#define MAX_CANNON_RANGE 200
#define MIN_CANNON_RANGE 15

new firedcannon[MAX_PLAYERS];
new CannonRange[MAX_PLAYERS] = 50;
new HPDeathCallTimer[MAX_PLAYERS];

stock randomEx(min, max)
{
    new rand9 = random(max-min)+min;
    return rand9;
}//credits to yless

stock GetPlayerVSpeed(playerid)
{
    new Float:x,Float:y,Float:z,Float:speed,final_speed;
    GetVehicleVelocity(GetPlayerVehicleID(playerid),x,y,z);
    speed = floatsqroot(((x*x)+(y*y))+(z*z))*100;
    final_speed = floatround(speed,floatround_round);
    return final_speed;
}

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
	if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 601)
 	{
 	    new string[128];
 	    if(HOLDING(65536))//yes
 	    {
 	        if(CannonRange[playerid] < MAX_CANNON_RANGE)
 	        {
 	        CannonRange[playerid] = CannonRange[playerid]+1;
 	        format(string, sizeof(string), "~g~Cannon's Range Increased To %i",CannonRange[playerid]);
 	        GameTextForPlayer(playerid,string,5000,4);
 	        }
 	        else
 	        {
 	            GameTextForPlayer(playerid,"~r~Cannon is at the maximum range of 200 meters",5000,4);
 	        }
 	    }
 	    else if(HOLDING(131072))//no
 	    {
 	        if(CannonRange[playerid] > MIN_CANNON_RANGE)
 	        {
 	        CannonRange[playerid] = CannonRange[playerid]-1;
 	        format(string, sizeof(string), "~r~Cannon's Range Decreased To %i",CannonRange[playerid]);
 	        GameTextForPlayer(playerid,string,5000,4);
 	        }
 	        else
 	        {
 	            GameTextForPlayer(playerid,"~r~Cannon is at the minimum range of 15 meters",5000,4);
 	        }
 	    }
 	}

	if(newkeys & KEY_FIRE)
    {
        if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 601)
        {
            if(firedcannon[playerid] == 0)
            {
		    	firedcannon[playerid] = 1;
			    SetTimerEx("cannonfired", 2500, false,"i",playerid);
			    new
				Float:x8, Float:y8, Float:z8,
				Float:x2, Float:y2, Float:z2,
				Float:x7, Float:y7, Float:z7,
				Float:object_x1, Float:object_y1, Float:object_z1;
				GetPlayerPos(playerid,x7,y7,z7);
			    GetPlayerCameraPos(playerid, x8,y8,z8);
				GetPlayerCameraFrontVector(playerid, x2,y2,z2);


				new sa2 = randomEx(-1, 1)*((CannonRange[playerid]-5)/10);
				new sa3 = randomEx(-1, 1)*((CannonRange[playerid]-5)/10);
				new Float:speedt2 = GetPlayerVSpeed(playerid);
				//dispersion by speed
				new speedt;
				if(speedt2 < 5.0)
				{
				    speedt = 1;
				}
				else if(speedt2 > 5.0 && speedt2 < 40.0)
				{
				    speedt = 2;
				}
				else if(speedt2 > 40.0)
				{
				    speedt = 3;
				}
				//
				object_x1 = x8 + floatmul(x2, CannonRange[playerid]);
				object_y1 = y8 + floatmul(y2, CannonRange[playerid]);


				MapAndreas_FindZ_For2DCoord(object_x1, object_y1, object_z1);

				if(z8+floatmul(z2, CannonRange[playerid]) <= object_z1)
				{
				    CreateExplosion(object_x1+sa2*speedt, object_y1+sa3*speedt, object_z1, 12, 3.5);
				    foreach(new i : Player)
				    {
					if(GetPlayerTeam(i) != GetPlayerTeam(playerid) || group[playerid][gid] != group[i][gid])
					{
		    				if(i != playerid)
	 						{
		    					    if(IsPlayerInRangeOfPoint(i,3.5,object_x1+sa2*speedt, object_y1+sa3*speedt, object_z1) && GetPlayerTeam(playerid) != (GetPlayerTeam(i)))
		    					    {
   					       				HPDeathCallTimer[i] = SetTimerEx("DeathCall",300,false,"iifi",i, playerid, 5.0, 51);
									}
							}
					}
					}
				}
				else if(z8+floatmul(z2, CannonRange[playerid]) > object_z1)
				{
				    CreateExplosion(object_x1+sa2*speedt, object_y1+sa3*speedt, z8+floatmul(z2, CannonRange[playerid]), 12, 5.0);
				    foreach(new i : Player)
				    {
                            if(i != playerid && GetPlayerTeam(i) != GetPlayerTeam(playerid) || group[playerid][gid] != group[i][gid])
	 						{
		    					    if(IsPlayerInRangeOfPoint(i,5.0,object_x1+sa2*speedt, object_y1+sa3*speedt, z8+floatmul(z2, CannonRange[playerid])) && GetPlayerTeam(playerid) != (GetPlayerTeam(i)))
		    					    {
   					       				HPDeathCallTimer[i] = SetTimerEx("DeathCall",300,false,"iifi",i, playerid, 5.0, 51);
									}
							}
					}
				}
			}
		}
	}
	return 1;
}

forward DeathCall(playerid,killerid,Float:HP,reason);
public DeathCall(playerid,killerid,Float:HP,reason)
{
	new Float:hitp;
	GetPlayerHealth(playerid, hitp);
	if((hitp - HP) <= 0.0)
	{
		return CallLocalFunction("OnPlayerDeath", "iii", playerid, killerid, reason);
	}
	return 1;
}

forward cannonfired(playerid);
public cannonfired(playerid)
{
    firedcannon[playerid] = 0;
    return 1;
}