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

quadraticOut detail::quadraticOutEasing quadraticOut {} inlineconstexpr Quadratic polynomial easing (t²) with gentle deceleration. The quadraticOut easing function provides subtle, smooth deceleration. It's the gentlest polynomial easing, perfect when you want polish without drama. Characteristics: Gentle, smooth deceleration Subtle but professional feel Never feels too slow or too fast Safe choice for any context This easing excels at: Subtle UI polish: Adding refinement without drawing attention Fast animations: 100-200ms durations Minimal interfaces: Clean, understated design systems Accessibility-friendly: Gentle motion reduces disorientation Background animations: Motion that shouldn't distract QuadraticOut is great when you want animations to stay out of the way. It's less dramatic than cubic but smoother than linear due to gradual deceleration. Mathematically: f(t) = 1 - (1-t)² // Subtle tooltip appearance auto opacity = tweeny::from(0.0f) .to(1.0f) .via(easing::quadraticOut) .during(15U) .build(); See also quadraticIn For gentle acceleration quadraticInOut For gentle motion at both ends cubicOut For more pronounced deceleration Visualize at https://easings.net/#easeOutQuad