Animation 和 flutter 中的 Animatable 有什么区别

Question

i read

A Tween inherits from Animatable, not from Animation. An Animatable, like Animation, doesn't have to output double. For example, ColorTween specifies a progression between two colors.

in Tween description but i can't undrestand wht's that

Answer 1

The main idea is that Animatable<T> can produce values which not need to be type of double . This values produced based on double values inputed to Tween. So, you can change values of Offset, or Color from blue to green, or some other type <T>. Input values from 0.0 to 1.0 -> output from Blue to Green