HANDLECONSTRAINTTYPE

HANDLECONSTRAINTTYPE_INVALID	Invalid handle constraint type, used to temporarily ignore handles (e.g. in the Camera Object with the Front/Back DOF handles).
HANDLECONSTRAINTTYPE_LINEAR	Linear handle constraint.
HANDLECONSTRAINTTYPE_PLANAR	Planar handle constraint.
HANDLECONSTRAINTTYPE_FREE	No constraint.
HANDLECONSTRAINTTYPE_RADIAL	Radial handle constraint.
HANDLECONSTRAINTTYPE_SPHERICAL	Spherical handle constraint.