backIn backInOut backOut bounceIn bounceInOut bounceOut byName circularIn circularInOut circularOut cubicIn cubicInOut cubicOut def elasticIn elasticInOut elasticOut exponentialIn exponentialInOut exponentialOut linear quadraticIn quadraticInOut quadraticOut quarticIn quarticInOut quarticOut quinticIn quinticInOut quinticOut sinusoidalIn sinusoidalInOut sinusoidalOut stepped

exponentialInOut detail::exponentialInOutEasing exponentialInOut {} inlineconstexpr Exponential easing with extreme acceleration and deceleration. The exponentialInOut easing function combines explosive acceleration in the first half with explosive deceleration in the second half. This creates one of the most dramatic, high-energy motion curves available, with rapid changes at both ends and smooth motion through the middle. Motion profile: First half: Exponential acceleration from near-zero velocity Midpoint: Maximum velocity Second half: Exponential deceleration to rest Creates extreme S-curve shape This easing is appropriate for: High-impact transitions: Scene changes, screen swipes Dramatic animations: Hero elements, focal content Fast-paced interfaces: Games, action-oriented apps Attention-grabbing motion: Elements that need maximum visibility Strong transitions: For elements moving significant distances or longer durations (500ms+) ExponentialInOut creates a powerful sense of momentum and energy. The motion feels purposeful and confident. However, the extreme acceleration can be disorienting if overused or applied to large elements. Best practices: Use for animations under 1 second duration Apply to elements that move short to medium distances Reserve for important, infrequent transitions Consider quarticInOut or quinticInOut as less extreme alternatives Mathematically: Combines exponentialIn for t < 0.5 and exponentialOut for t >= 0.5 // Page transition with explosive motion auto position = tweeny::from(0.0f) .to(1920.0f) .via(easing::exponentialInOut) .during(40U) .build(); // Modal dialog with dramatic appearance auto opacity = tweeny::from(0.0f) .to(1.0f) .via(easing::exponentialInOut) .during(30U) .build(); See also exponentialIn For only explosive acceleration exponentialOut For only explosive deceleration quinticInOut For slightly less extreme alternative Visualize at https://easings.net/#easeInOutExpo