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/*
* Copyright (C) 2022 NotEnoughUpdates contributors
*
* This file is part of NotEnoughUpdates.
*
* NotEnoughUpdates is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* NotEnoughUpdates is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
*/
package io.github.moulberry.notenoughupdates.util;
public class LerpingFloat {
private int timeSpent;
private long lastMillis;
private final int timeToReachTarget;
private float targetValue;
private float lerpValue;
public LerpingFloat(float initialValue, int timeToReachTarget) {
this.targetValue = this.lerpValue = initialValue;
this.timeToReachTarget = timeToReachTarget;
}
public LerpingFloat(int initialValue) {
this(initialValue, 200);
}
public void tick() {
int lastTimeSpent = timeSpent;
this.timeSpent += System.currentTimeMillis() - lastMillis;
float lastDistPercentToTarget = lastTimeSpent / (float) timeToReachTarget;
float distPercentToTarget = timeSpent / (float) timeToReachTarget;
float fac = (1 - lastDistPercentToTarget) / lastDistPercentToTarget;
float startValue = lerpValue - (targetValue - lerpValue) / fac;
float dist = targetValue - startValue;
if (dist == 0) return;
float oldLerpValue = lerpValue;
if (distPercentToTarget >= 1) {
lerpValue = targetValue;
} else {
lerpValue = startValue + dist * distPercentToTarget;
}
if (lerpValue == oldLerpValue) {
timeSpent = lastTimeSpent;
} else {
this.lastMillis = System.currentTimeMillis();
}
}
public void resetTimer() {
this.timeSpent = 0;
this.lastMillis = System.currentTimeMillis();
}
public void setTarget(float targetValue) {
this.targetValue = targetValue;
}
public void setValue(float value) {
this.targetValue = this.lerpValue = value;
}
public float getValue() {
return lerpValue;
}
public float getTarget() {
return targetValue;
}
}
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