Chet Haase | e0ee2e9 | 2010-10-07 09:06:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.animation; |
| 18 | |
| 19 | /** |
| 20 | * A time interpolator defines the rate of change of an animation. This allows animations |
| 21 | * to have non-linear motion, such as acceleration and deceleration. |
| 22 | */ |
| 23 | public interface TimeInterpolator { |
| 24 | |
| 25 | /** |
Chet Haase | 5c13d89 | 2010-10-08 08:37:55 -0700 | [diff] [blame] | 26 | * Maps a value representing the elapsed fraction of an animation to a value that represents |
Chet Haase | e0ee2e9 | 2010-10-07 09:06:18 -0700 | [diff] [blame] | 27 | * the interpolated fraction. This interpolated value is then multiplied by the change in |
| 28 | * value of an animation to derive the animated value at the current elapsed animation time. |
| 29 | * |
| 30 | * @param input A value between 0 and 1.0 indicating our current point |
| 31 | * in the animation where 0 represents the start and 1.0 represents |
| 32 | * the end |
| 33 | * @return The interpolation value. This value can be more than 1.0 for |
| 34 | * interpolators which overshoot their targets, or less than 0 for |
| 35 | * interpolators that undershoot their targets. |
| 36 | */ |
| 37 | float getInterpolation(float input); |
| 38 | } |