com.badlogic.gdx.scenes.scene2d.interpolators.OvershootInterpolator Maven / Gradle / Ivy
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* Copyright 2011 See AUTHORS file.
*
* 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.badlogic.gdx.scenes.scene2d.interpolators;
import com.badlogic.gdx.scenes.scene2d.Interpolator;
import com.badlogic.gdx.utils.Pool;
/** An interpolator where the change overshoots the target and springs back to the target position.
*
* The factor defines the rate of overshoot.
*
* @author Moritz Post */
public class OvershootInterpolator implements Interpolator {
private static final float DEFAULT_FACTOR = 1.0f;
private static final Pool pool = new Pool(4, 100) {
@Override
protected OvershootInterpolator newObject () {
return new OvershootInterpolator();
}
};
private float factor;
private double doubledFactor;
OvershootInterpolator () {
// hide constructor
}
/** Gets a new {@link OvershootInterpolator} from a maintained pool of {@link Interpolator}s.
*
* @param factor the factor controlling the rate of overshoot energy change
* @return the obtained {@link OvershootInterpolator} */
public static OvershootInterpolator $ (float factor) {
OvershootInterpolator inter = pool.obtain();
inter.factor = factor;
inter.doubledFactor = factor * 2;
return inter;
}
/** Gets a new {@link OvershootInterpolator} from a maintained pool of {@link Interpolator}s.
*
* The initial factor is set to {@value OvershootInterpolator#DEFAULT_FACTOR}.
*
* @return the obtained {@link OvershootInterpolator} */
public static OvershootInterpolator $ () {
return $(DEFAULT_FACTOR);
}
@Override
public void finished () {
pool.free(this);
}
public float getInterpolation (float t) {
t -= 1.0f;
return t * t * ((factor + 1) * t + factor) + 1.0f;
}
@Override
public Interpolator copy () {
return $(factor);
}
}