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

sinusoidalOut detail::sinusoidalOutEasing sinusoidalOut {} inlineconstexpr Sinusoidal easing based on sine wave for smooth deceleration. The sinusoidalOut easing function uses a sine curve for deceleration, creating extremely smooth, natural motion that settles gently. Characteristics: Very smooth deceleration Natural, flowing motion Gentle slowdown Mathematically elegant This easing excels at: Natural UI motion: Smooth, organic feel Continuous animations: Loops, cycles, repeated motion Gentle transitions: Calm, relaxed interfaces Accessible design: Motion-sensitivity friendly SinusoidalOut is excellent when you want smoothness above all else. It's gentler than quadratic while still providing clear easing. Mathematically: f(t) = sin(t * π/2) // Smooth fade in auto opacity = tweeny::from(0.0f) .to(1.0f) .via(easing::sinusoidalOut) .during(30U) .build(); See also sinusoidalIn For smooth acceleration sinusoidalInOut For smooth motion at both ends quadraticOut For similar gentleness Visualize at https://easings.net/#easeOutSine