/*
 * Copyright (C) 2006 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

module android.view.animation{
    /**
     * An interpolator defines the rate of change of an animation. This allows
     * the basic animation effects (alpha, scale, translate, rotate) to be
     * accelerated, decelerated, repeated, etc.
     */
    export interface Interpolator{
        /**
         * Maps a value representing the elapsed fraction of an animation to a value that represents
         * the interpolated fraction. This interpolated value is then multiplied by the change in
         * value of an animation to derive the animated value at the current elapsed animation time.
         *
         * @param input A value between 0 and 1.0 indicating our current point
         *        in the animation where 0 represents the start and 1.0 represents
         *        the end
         * @return The interpolation value. This value can be more than 1.0 for
         *         interpolators which overshoot their targets, or less than 0 for
         *         interpolators that undershoot their targets.
         */
        getInterpolation(input:number):number;
    }
}