stock AngleInRangeOfAngle(Float:a1, Float:a2, Float:range)
{
    a1 -= a2;
    if((a1 < range) && (a1 > -range)) return true;
    return false;
}

stock Float:DistanceCameraTargetToLocation( Float:CamX, Float:CamY, Float:CamZ, Float:ObjX, Float:ObjY, Float:ObjZ, Float:FrX, Float:FrY, Float:FrZ ) {

	new Float:TGTDistance;
	TGTDistance = floatsqroot(( CamX - ObjX ) * ( CamX - ObjX ) + ( CamY - ObjY ) * ( CamY - ObjY ) + ( CamZ - ObjZ ) * ( CamZ - ObjZ ));
	new Float:tmpX, Float:tmpY, Float:tmpZ;

	tmpX = FrX * TGTDistance + CamX;
	tmpY = FrY * TGTDistance + CamY;
	tmpZ = FrZ * TGTDistance + CamZ;

	return floatsqroot(( tmpX - ObjX ) * ( tmpX - ObjX ) + ( tmpY - ObjY ) * ( tmpY - ObjY ) + ( tmpZ - ObjZ ) * ( tmpZ - ObjZ ));
}

stock Float:GetPointAngleToPoint( Float:x2, Float:y2, Float:_X, Float:_Y )
{

  new Float:DX, Float:DY;
  new Float:angle;

  DX = floatabs( floatsub( x2,_X ));
  DY = floatabs( floatsub( y2,_Y ));

  if( DY == 0.0 || DX == 0.0)
  {
    if( DY == 0 && DX > 0) angle = 0.0;
    else if( DY == 0 && DX < 0) angle = 180.0;
    else if( DY > 0 && DX == 0) angle = 90.0;
    else if( DY < 0 && DX == 0) angle = 270.0;
    else if( DY == 0 && DX == 0) angle = 0.0;
  }
  else
  {
    angle = atan( DX/DY );

    if( _X > x2 && _Y <= y2 ) angle += 90.0;
    else if( _X <= x2 && _Y < y2 ) angle = floatsub( 90.0, angle );
    else if( _X < x2 && _Y >= y2 ) angle -= 90.0;
    else if( _X >= x2 && _Y > y2 ) angle = floatsub( 270.0, angle );
  }

  return floatadd( angle, 90.0);
}

stock IsPlayerAimingAt( playerid, Float:x, Float:y, Float:z, Float:radius )
{
	new Float:camera_x,Float:camera_y,Float:camera_z,Float:vector_x,Float:vector_y,Float:vector_z;
	GetPlayerCameraPos( playerid, camera_x, camera_y, camera_z );
	GetPlayerCameraFrontVector( playerid, vector_x, vector_y, vector_z );
	new Float:vertical, Float:horizontal;

	switch ( GetPlayerWeapon( playerid ))
	{
 		case 34,35,36:
	  	{
	  		if( DistanceCameraTargetToLocation( camera_x, camera_y, camera_z, x, y, z, vector_x, vector_y, vector_z ) < radius ) return true;
		  	return false;
	  	}
	  	case 30,31: { vertical = 4.0; horizontal = -1.6;}
	  	case 33: { vertical = 2.7; horizontal = -1.0;}
	  	default: { vertical = 6.0; horizontal = -2.2;}
	}

	new Float:angle = GetPointAngleToPoint( 0, 0, floatsqroot( vector_x*vector_x+vector_y*vector_y ), vector_z ) - 270.0;
	new Float:resize_x, Float:resize_y, Float:resize_z = floatsin( angle+vertical, degrees );
	GetXYInFrontOfPoint( resize_x, resize_y, GetPointAngleToPoint( 0, 0, vector_x, vector_y )+horizontal, floatcos( angle+vertical, degrees ));

	if( DistanceCameraTargetToLocation( camera_x, camera_y, camera_z, x, y, z, resize_x, resize_y, resize_z ) < radius ) return true;
	return false;
}

stock IsPlayerFacingPlayer(playerid, targetid, Float:dOffset)
{
    new
        Float:pX,
        Float:pY,
        Float:pZ,
        Float:pA,
        Float:X,
        Float:Y,
        Float:Z,
        Float:ang;

    if(!IsPlayerConnected(playerid) || !IsPlayerConnected(targetid)) return 0;
    GetPlayerPos(targetid, pX, pY, pZ);
    GetPlayerPos(playerid, X, Y, Z);
    GetPlayerFacingAngle(playerid, pA);

    if( Y > pY ) ang = (-acos((X - pX) / floatsqroot((X - pX)*(X - pX) + (Y - pY)*(Y - pY))) - 90.0);
    else if( Y < pY && X < pX ) ang = (acos((X - pX) / floatsqroot((X - pX)*(X - pX) + (Y - pY)*(Y - pY))) - 450.0);
    else if( Y < pY ) ang = (acos((X - pX) / floatsqroot((X - pX)*(X - pX) + (Y - pY)*(Y - pY))) - 90.0);
    return AngleInRangeOfAngle(-ang, pA, dOffset);

}


public OnPlayerUpdate( playerid )
{
    new Keys,ud,lr;
    GetPlayerKeys(playerid,Keys,ud,lr);

	if( Keys & KEY_FIRE )
	{
		if( GetPlayerTargetPlayer( playerid ) == npc )
		{
		    if( GetPlayerWeaponState( playerid ) != WEAPONSTATE_NO_BULLETS && GetPlayerWeaponState( playerid ) != WEAPONSTATE_RELOADING	)
			{
				if( GetPlayerCameraMode( playerid ) == 53 )
				{
					if( IsPlayerFacingPlayer( playerid, npc, 5.0 ) )
					{
						if( IsPlayerAimingAt( playerid, x, y, z, 4.2 ) )
						{
						    new Float:dmg;

						    // Default GTA:SA weapon damages.
						    switch( GetPlayerWeapon( playerid ) )
						    {
								case 22: dmg = 17.0;
								case 23: dmg = 40.0;
								case 24: dmg = 70.0;
								case 32: dmg = 20.0;
								case 28: dmg = 20.0;
								case 29: dmg = 25.0;
								case 25: dmg = 50.0;
								case 26: dmg = 40.0;
								case 27: dmg = 20.0;
								case 31: dmg = 35.0;
								case 30: dmg = 30.0;
								case 33: dmg = 70.0;
								case 34: dmg = 125.0;
							 	default: dmg = 30.0;
                        	}
                        }
                    }
                }
            }
        }
    }
}