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

stepped detail::steppedEasing stepped {} inlineconstexpr Stepped easing that holds the start value until the keyframe completes. The stepped easing function returns the starting value throughout the entire duration of the keyframe segment, only jumping to the target value when moving to the next keyframe. This creates instant transitions between keyframes without any interpolation within each segment. Characteristics: No interpolation within keyframe segments Holds start value until keyframe ends Instant jumps between keyframes Creates discrete, stair-step motion This easing is ideal for: Discrete state transitions: Values that shouldn't interpolate smoothly Keyframe-based animations: Step through distinct poses or states Frame-by-frame effects: Hold each frame without blending Boolean-like values: Properties that need instant changes Sprite switching: Change sprites at keyframe boundaries Cut transitions: Instant changes without fading Stepped is fundamentally different from other easings because it eliminates interpolation entirely within each keyframe segment, creating hard cuts between animation states. // Hold value at each keyframe, jump instantly between them auto value = tweeny::from(0) .to(10).via(easing::stepped).during(100U) .to(20).via(easing::stepped).during(100U) .to(30).via(easing::stepped).during(100U) .build(); // During frames 0-99: returns 0 // During frames 100-199: returns 10 // During frames 200-299: returns 20 // At frame 300: returns 30 // Useful for sprite animation indices auto spriteIndex = tweeny::from(0) .to(1).via(easing::stepped).during(10U) .to(2).via(easing::stepped).during(10U) .to(3).via(easing::stepped).during(10U) .build(); // Holds each sprite index for 10 frames, then instantly switches See also linear For smooth constant-velocity interpolation