| /* |
| * 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 |
| * |
| * 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. |
| */ |
| |
| package android.animation; |
| |
| /** |
| * A time interpolator defines the rate of change of an animation. This allows animations |
| * to have non-linear motion, such as acceleration and deceleration. |
| */ |
| public interface TimeInterpolator { |
| |
| /** |
| * 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. |
| */ |
| float getInterpolation(float input); |
| } |