com.nineoldandroids.animation
Class ArgbEvaluator

java.lang.Object
  com.nineoldandroids.animation.ArgbEvaluator

All Implemented Interfaces:

TypeEvaluator

public class ArgbEvaluator
extends Object
implements TypeEvaluator

This evaluator can be used to perform type interpolation between integer values that represent ARGB colors.

Constructor Summary

ArgbEvaluator()

Method Summary

Object

evaluate(float fraction, Object startValue, Object endValue) This function returns the calculated in-between value for a color given integers that represent the start and end values in the four bytes of the 32-bit int.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ArgbEvaluator

public ArgbEvaluator()

Method Detail

evaluate

public Object evaluate(float fraction,
                       Object startValue,
                       Object endValue)

This function returns the calculated in-between value for a color given integers that represent the start and end values in the four bytes of the 32-bit int. Each channel is separately linearly interpolated and the resulting calculated values are recombined into the return value.

Specified by:

evaluate in interface TypeEvaluator

Parameters:

fraction - The fraction from the starting to the ending values

startValue - A 32-bit int value representing colors in the separate bytes of the parameter

endValue - A 32-bit int value representing colors in the separate bytes of the parameter

Returns:

A value that is calculated to be the linearly interpolated result, derived by separating the start and end values into separate color channels and interpolating each one separately, recombining the resulting values in the same way.