com.nineoldandroids.animation
Interface TypeEvaluator<T>

All Known Implementing Classes:

ArgbEvaluator, FloatEvaluator, IntEvaluator

public interface TypeEvaluator<T>

Interface for use with the ValueAnimator.setEvaluator(TypeEvaluator) function. Evaluators allow developers to create animations on arbitrary property types, by allowing them to supply custom evaulators for types that are not automatically understood and used by the animation system.

See Also:

ValueAnimator.setEvaluator(TypeEvaluator)

Method Summary

T	evaluate(float fraction, T startValue, T endValue) This function returns the result of linearly interpolating the start and end values, with fraction representing the proportion between the start and end values.

Method Detail

evaluate

T evaluate(float fraction,
           T startValue,
           T endValue)

This function returns the result of linearly interpolating the start and end values, with fraction representing the proportion between the start and end values. The calculation is a simple parametric calculation: result = x0 + t * (v1 - v0), where x0 is startValue, x1 is endValue, and t is fraction.

Parameters:

fraction - The fraction from the starting to the ending values

startValue - The start value.

endValue - The end value.

Returns:

A linear interpolation between the start and end values, given the fraction parameter.