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/*
* Copyright (C) 2014 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 com.android.camera.ui.motion;
/**
* Simple functions that produce values along a curve for any given input and can compute input
* times for a given output value.
*/
public interface UnitCurve {
/**
* Produce a unit value of this curve at time t. The function should always return a valid
* return value for any valid t input.
*
* @param t ratio of time passed from (0..1)
* @return the unit value at t.
*/
float valueAt(float t);
/**
* If possible, find a value for t such that valueAt(t) == value or best guess.
*
* @param value to match to the output of valueAt(t)
* @return t where valueAt(t) == value or throw.
*/
float tAt(float value);
}
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