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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;
/**
* Various static helper functions for interpolating between values.
*/
public class InterpolateUtils {
private InterpolateUtils() {
}
/**
* Linear interpolation from v0 to v1 as t goes from 0...1
*
* @param v0 the value at t=0
* @param v1 the value at t=1
* @param t value in the range of 0 to 1.
* @return the value between v0 and v1 as a ratio between 0 and 1 defined by t.
*/
public static float lerp(float v0, float v1, float t) {
return v0 + t * (v1 - v0);
}
/**
* Project a value that is within the in(Min/Max) number space into the to(Min/Max) number
* space.
*
* @param v value to scale into the 'to' number space.
* @param vMin min value of the values number space.
* @param vMax max value of the values number space.
* @param pMin min value of the projection number space.
* @param pMax max value of the projection number space.
* @return the ratio of the value in the source number space as a value in the to(Min/Max)
* number space.
*/
public static float scale(float v, float vMin, float vMax, float pMin, float pMax) {
return (pMax - pMin) * (v - vMin) / (vMax - vMin) + pMin;
}
/**
* Value between 0 and 1 as a ratio between tBegin over tDuration
* with no upper bound.
*/
public static float unitRatio(long t, long tBegin, float tDuration) {
if (t <= tBegin) {
return 0.0f;
}
return (t - tBegin) / tDuration;
}
}
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