自定义动画，实现矩形切割
1.使用

        Image image = new Image(Asset.getAsset().getTexture("1_75_43.png"));
        addActor(image);
        ClipAnimation animation = new ClipAnimation(image.getHeight(),0,10,Interpolation.bounce);
        image.addAction(animation);

自定义代码

public class ClipAnimation extends TemporalAction {
    private Group srcParentGroup;
    private Group tempParentGroup;
    private float middleValue = 0;
    private float startValue = 0;
    private float endValue = 0;
    public ClipAnimation(float startValue,float endValue,float duration,Interpolation interpolation){
        setStartValue(startValue);
        setEndValue(endValue);
        setDuration(duration);
        setInterpolation(interpolation);
    }


    @Override
    public void setActor(Actor actor) {
        super.setActor(actor);
        if (actor==null)return;
        srcParentGroup = target.getParent();
        tempParentGroup = new Group(){
            @Override
            public void draw(Batch batch, float parentAlpha) {
                batch.flush();
                if (clipBegin(0,0, tempParentGroup.getWidth(), tempParentGroup.getHeight()- middleValue)) {
                    super.draw(batch, parentAlpha);
                    batch.flush();
                    clipEnd();
                }
            }
        };
        tempParentGroup.addActor(actor);
        srcParentGroup.addActor(tempParentGroup);
        tempParentGroup.setSize(actor.getWidth(),actor.getHeight());
        tempParentGroup.setPosition(actor.getX(Align.center),actor.getY(Align.center),Align.center);
        actor.setPosition(tempParentGroup.getWidth()/2, tempParentGroup.getHeight()/2,Align.center);
        tempParentGroup.setDebug(true);
    }

    @Override
    public boolean act(float delta) {
        boolean act = super.act(delta);
        if (act){
            srcParentGroup.addActor(actor);
            actor.setPosition(tempParentGroup.getX(Align.center), tempParentGroup.getY(Align.center),Align.center);
        }
        return act;
    }

    public void setStartValue(float startValue) {
        this.startValue = startValue;
    }

    public void setEndValue(float endValue) {
        this.endValue = endValue;
    }

    @Override
    protected void update(float v) {
        float v1 = endValue - startValue;
        middleValue = startValue + v1 * v;
    }
}