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This is a backport of OpenJFX 8 to run on Java 7.

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/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package javafx.animation;

/**
 * A value that can be interpolated. It defines single
 * {@link #interpolate(Object, double)} method, which returns interpolated value
 * of given fraction.
 * @since JavaFX 2.0
 */
public interface Interpolatable {

    /**
     * The function calculates an interpolated value along the fraction
     * {@code t} between {@code 0.0} and {@code 1.0}. When {@code t} = 1.0,
     * {@code endVal} is returned.
     * 
     * @param endValue
     *            target value
     * @param t
     *            fraction between {@code 0.0} and {@code 1.0}
     * @return interpolated value
     */
    public T interpolate(T endValue, double t);
}