[Voxel]

Use OnPlayerKeyStateChange and detect if the player is holding the KEY_FIRE and detect his weapon to be the chainsaw ID.
example:

pawn Код:

#define HOLDING(%0) \
    ((newkeys & (%0)) == (%0))

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if (HOLDING(KEY_FIRE))
    {
        if(GetPlayerWeapon(playerid) == 9)
        {
            IsPlayerInRangeOfPoint etc etc 
        }
    }
    return 1;
}