39 lines
1.6 KiB
Java
39 lines
1.6 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.animation;
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/**
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* A time interpolator defines the rate of change of an animation. This allows animations
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* to have non-linear motion, such as acceleration and deceleration.
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*/
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public interface TimeInterpolator {
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/**
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* Maps a value representing the elapsed fraction of an animation to a value that represents
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* the interpolated fraction. This interpolated value is then multiplied by the change in
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* value of an animation to derive the animated value at the current elapsed animation time.
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*
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* @param input A value between 0 and 1.0 indicating our current point
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* in the animation where 0 represents the start and 1.0 represents
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* the end
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* @return The interpolation value. This value can be more than 1.0 for
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* interpolators which overshoot their targets, or less than 0 for
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* interpolators that undershoot their targets.
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*/
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float getInterpolation(float input);
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}
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