[CaveDweller]

When a player is driving a vehicle, how can I get the ID of the vehicle in front of them within a distance of 50m (if there is a vehicle within 50m).

Thanks

[Faisal_khan]

https://sampforum.blast.hk/showthread.php?tid=517997

pawn Код:

stock FindClosestVehicle(playerid)
{
    new
        Float:x, Float:y, Float:z,
        closest = -1;

    for(new a = 0; a < MAX_VEHICLES; a++)
    {
        GetVehiclePos(a, x, y, z);

        if(a != YOUR_VEHICLEID_OR_ARRAY/VARIBLE && IsPlayerInRangeOfPoint(playerid, 10.0, x, y, z))
        {
            closest = a;
        }
    }
    if(closest != -1) return closest;
    
    return INVALID_VEHICLE_ID;
}

[CaveDweller]

Thanks, but I don't want the closest vehicle. I want the closest vehicle that is in front of the given vehicle. The purpose is for players in police cars to be able to "read" the license plate of the vehicle infront.

[Vince]

Except that will check vehicles in all directions. The OP specifically asks for the front (speed radar?). The way I'd do it would be with the streamer plugin. You need to calculate these 3 points (A, B and C) with trigonometry as the input for CreateDynamicPolygon. Then use a similar loop as demonstrated above, while filtering out any vehicles not in the zone.

[CaveDweller]

Quote:

Originally Posted by Vince Except that will check vehicles in all directions. The OP specifically asks for the front (speed radar?). The way I'd do it would be with the streamer plugin. You need to calculate these 3 points (A, B and C) with trigonometry as the input for CreateDynamicPolygon. Then use a similar loop as demonstrated above, while filtering out any vehicles not in the zone. [i m g]http://puu.sh/9jovP/fa64a6d157.png[/img]

Thanks, Vince. However, trigonometry isn't exactly my strong point so I'd appreciate it if you could point me in the right direction here.


If I know point A, how can I work out points B, C and D (where line AC is exactly parallel with the sides of the car) based on the rotation of the car?

[Threshold]

pawn Код:

new Float:x, y, a;
new vid = GetPlayerVehicleID(playerid);
GetVehiclePos(vid, x, y, a);
GetVehicleZAngle(vid, a);

Point C:
x += (50.0 * floatsin(-a, degrees));
y += (50.0 * floatcos(-a, degrees));

Point B:
x += (50.0 * floatsin(-(a - 15), degrees));
y += (50.0 * floatcos(-(a - 15), degrees));

Point D:
x += (50.0 * floatsin(-(a + 15), degrees));
y += (50.0 * floatcos(-(a + 15), degrees));

That's what I would do.

EDIT: Alternatively, you can add a 'Z' coord check to see whether the other vehicle is within a range of 10 or so units in height.

[CaveDweller]

Thanks guys, it works great! https://www.youtube.com/watch?v=K9jM3UopcIM