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Interpolation type constants are in the form: IP_<EQUATION>_<EASING>
The equation type can be any of the following:

2X     - Quadratic
3X     - Cubic
4X     - Quartic
5X     - Quintic
SIN    - Sine
BOUNCE - Bounce

The easing type can be any of the following:

LINEAR     - Linear from start to end.
ACCEL      - Start slow, speed up.
DECEL      - Start fast, slow to stop.
SMOOTH     - Start slow, accelerate, decelerate, slow to stop. Combination of ACCEL and DECEL.
SMOOTH_INV - Start slow, speed up, stop halfway, start fast, slow to stop. Inverted SMOOTH (DECEL then ACCEL)

Note: The BOUNCE equation does not support LINEAR or SMOOTH_INV easing types.

List of all valid combinations:

IP_LINEAR
IP_2X_ACCEL
IP_3X_ACCEL
IP_4X_ACCEL
IP_5X_ACCEL
IP_2X_DECEL
IP_3X_DECEL
IP_4X_DECEL
IP_5X_DECEL
IP_2X_SMOOTH
IP_3X_SMOOTH
IP_4X_SMOOTH
IP_5X_SMOOTH
IP_2X_SMOOTH_INV
IP_3X_SMOOTH_INV
IP_4X_SMOOTH_INV
IP_5X_SMOOTH_INV
IP_SIN_ACCEL
IP_SIN_DECEL
IP_SIN_SMOOTH
IP_SIN_SMOOTH_INV
IP_BOUNCE_ACCEL
IP_BOUNCE_DECEL
IP_BOUNCE_SMOOTH