in_sine

Function

in_sine(t: float) -> float

Sine ease in - gentle, natural acceleration

Based on a quarter sine wave. Provides the most natural feeling acceleration - like how objects naturally speed up in the real world. Gentler than quadratic, more organic feeling. Use cases: - Natural object movements - Organic animations - Subtle fade-ins - When you want smooth but not too dramatic

Parameters

t: Time factor between 0 and 1

Returns

Eased value between 0 and 1, following 1-cos(t*π/2) Raises: ValueError: If t is not between 0 and 1