joystick and relay programming plz help!

[programmr]

i have

Joystick* thirdStick; //Joystick USB3
Relay* agitator; //Relay 1
Relay* agitator2; //Relay 1

thirdStick= new Joystick(3);
agitator = new Relay(1, agitator->kBothDirections);
agitator2 = new Relay(1, agitator2->kBothDirections);

if (thirdStick->GetRawButton(1)) {
agitator->Set(agitator2->kReverse);
}
else {
agitator->Set(agitator2->kOff);
}

i want to know how can i make the relay go forward and then go reverse based on either the x or y axis of the joystick: example:

x axis : left makes relay1 go rev, right makes relay1 go fwd

Please help! thank you!