[Threshold]

GetVehicleWheelPos(vehicleid, wheel, &Float, &Float:y, &Float:z)

This function does include an optional macro for wheel types, but you can put it the integer values if you prefer it...

pawn Код:

#define WHEELSFRONT_LEFT    0
#define WHEELSFRONT_RIGHT   1
#define WHEELSMID_LEFT      2
#define WHEELSMID_RIGHT     3
#define WHEELSREAR_LEFT     4
#define WHEELSREAR_RIGHT    5

The macros are quite self-explanatory and are easier to identify compared to the numbers themselves.

pawn Код:

GetVehicleWheelPos(vehicleid, wheel, &Float:x, &Float:y, &Float:z)
{
    new Float:rot, Float:x2, Float:y2, Float:z2, Float:div;
    GetVehicleZAngle(vehicleid, rot);
    rot = 360 - rot;
    GetVehiclePos(vehicleid, x2, y2, z2);
    switch(wheel)
    {
        case WHEELSFRONT_LEFT .. WHEELSFRONT_RIGHT: //Front Tyres
           GetVehicleModelInfo(GetVehicleModel(vehicleid), VEHICLE_MODEL_INFO_WHEELSFRONT, x, y, z);
        case WHEELSMID_LEFT .. WHEELSMID_RIGHT: //Middle Tyres
            GetVehicleModelInfo(GetVehicleModel(vehicleid), VEHICLE_MODEL_INFO_WHEELSMID, x, y, z);
        case WHEELSREAR_LEFT .. WHEELSREAR_RIGHT: //Rear Tyres
            GetVehicleModelInfo(GetVehicleModel(vehicleid), VEHICLE_MODEL_INFO_WHEELSREAR, x, y, z);
        default: return 0;
    }
    div = (wheel % 2) ? (x) : (-x);
    x = floatsin(rot, degrees) * y + floatcos(rot, degrees) * div + x2;
    y = floatcos(rot, degrees) * y - floatsin(rot, degrees) * div + y2;
    z += z2;
    return 1;
}

Considering that the values of the wheel type are not changed, this function will work.

Example of it's usage:

pawn Код:

CMD:fixtyre(playerid, params[])
{
    new vehicleid = GetPlayerVehicleID(playerid);
    if(!vehicleid) return 0;
    new Float:x, Float:y, Float:z;
    if(!GetVehicleWheelPos(vehicleid, WHEELSREAR_LEFT, x, y, z)) return print("Invalid wheel type");
    //Get the tyre position of the rear left tyre.
    SetPlayerCheckpoint(playerid, x, y, z, 1.0);
    //Sets a checkpoint on the player's rear left tyre.
    SendClientMessage(playerid, -1, "A checkpoint has been placed on your back tyre.");
    return 1;
}