A more configurable bounce interpolator for Android animations
import android.view.animation.Interpolator;
import static java.lang.Math.*;
public class BetterBounceInterpolator implements Interpolator {
private int mBounces;
private double mEnergy;
/** Have more control over how to bounce your values.
*
*/
public BetterBounceInterpolator(){
this(3);
}
/** Have more control over how to bounce your values.
*
* @param bounces number of times to bounce before coming to a rest
*/
public BetterBounceInterpolator(int bounces){
this(bounces, 0.3f);
}
/** Have more control over how to bounce your values.
*
* @param bounces number of times to bounce before coming to a rest
* @param energyFactor control how the bounce loses momentum. 0 is lose energy linearly. 1 energy loss slows down over time, -1 energy loss speeds up over time. Values greater than 1 and less than -1 cause over/under bounce
*/
public BetterBounceInterpolator(int bounces, double energyFactor){
mBounces = bounces;
mEnergy = energyFactor + 0.5;
}
@Override public float getInterpolation(float x) {
return (float) (1d + (-abs(cos(x * 10 * mBounces/PI)) * getCurveAdjustment(x)));
}
private double getCurveAdjustment(double x){
return -(2 * (1 - x) * x * mEnergy + x * x) + 1;
}
}