com.nineoldandroids.animation
Class FloatEvaluator

java.lang.Object
  com.nineoldandroids.animation.FloatEvaluator

All Implemented Interfaces:

TypeEvaluator<Number>

public class FloatEvaluator
extends Object
implements TypeEvaluator<Number>

This evaluator can be used to perform type interpolation between float values.

Constructor Summary

FloatEvaluator()

Method Summary

Float

evaluate(float fraction, Number startValue, Number 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.

Methods inherited from class java.lang.Object

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

Constructor Detail

FloatEvaluator

public FloatEvaluator()

Method Detail

evaluate

public Float evaluate(float fraction,
                      Number startValue,
                      Number 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.

Specified by:

evaluate in interface TypeEvaluator<Number>

Parameters:

fraction - The fraction from the starting to the ending values

startValue - The start value; should be of type float or Float

endValue - The end value; should be of type float or Float

Returns:

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