in_out_elastic

in_out_elastic(t: float) -> float

Elastic ease in-out - combines elastic anticipation with bouncy arrival.

Creates a complex motion that starts with oscillating buildup (like drawing back a slingshot), rapidly accelerates through the middle, then oscillates around the target before settling. Combines the best of both elastic behaviors. Mathematical form: Uses scaled sine waves with exponential decay on both ends Use cases: - High-impact transitions that need maximum personality - Game animations for special abilities or power-ups - Attention-grabbing modal transitions - Playful loading sequences that entertain users - Celebration animations that feel extra bouncy - UI elements that need to stand out with elastic character Like a professional yo-yo trick: complex wind-up with multiple oscillations, rapid motion through the middle, then multiple bounces before settling perfectly.