Angle Atan2

[ptiseigneur]

for a game top view,I need the limited angle,so:

for Right limiting 180°:
Fixer l angle a ATan2(Y( "Player_Character" )-YMouse, Abs(XMouse-X( "Player_Character" )))

For left limiting 180°:
Fixer l angle a ATan2(Y( "Player_Character" )-YMouse, -1*Abs(XMouse-X( "Player_Character" )))

but if i want limiting atan2 180° for Up and Down?