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  * Copyright (C) 2010 The Android Open Source Project
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package com.actionbarsherlock.internal.nineoldandroids.animation;

Interface for use with the ValueAnimator.setEvaluator(com.actionbarsherlock.internal.nineoldandroids.animation.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.

public interface TypeEvaluator<T> {

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.

fraction The fraction from the starting to the ending values
startValue The start value.
endValue The end value.
A linear interpolation between the start and end values, given the fraction parameter.
    public T evaluate(float fraction, T startValue, T endValue);
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