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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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 org.apache.pivot.wtk.effects.easing;
/**
* Exponential easing operation.
*/
public class Exponential implements Easing {
@Override
public float easeIn(float time, float begin, float change, float duration) {
return (time == 0) ? begin
: change * (float)Math.pow(2, 10 * (time / duration - 1f)) + begin;
}
@Override
public float easeOut(float time, float begin, float change, float duration) {
return (time == duration) ? begin + change
: change * ((float)-Math.pow(2, -10 * time / duration) + 1f) + begin;
}
@Override
public float easeInOut(float time, float begin, float change, float duration) {
if (time == 0) {
return begin;
}
if (time == duration) {
return begin + change;
}
if ((time /= duration / 2f) < 1) {
return change / 2f * (float)Math.pow(2, 10 * (time - 1)) + begin;
}
return change / 2f * ((float)-Math.pow(2, -10 * (time - 1)) + 2) + begin;
}
}