在libGdx中将精灵从角度a旋转到角度b

Question

我对AI之后的简单路径有一点问题。 如果我使用setRotation()精灵突然旋转，但我需要以渐进和自然的方式旋转它。

我对三角学知识很少，所以我在这里问。

public class AISprite extends Sprite {
    private Vector2 velocity = new Vector2();
    private float speed = 100; 
    private Array<Vector2> path; // it contains viewpoints
    private int waypoint = 0;  // index of actual waypoint

    public AISprite(Sprite sprite, Array<Vector2> path){
        super(sprite);
        this.path = path;
    }

    @Override
    public void draw(SpriteBatch spriteBatch){
        update(Gdx.graphics.getDeltaTime());
        super.draw(spriteBatch);
    }

    public void update(float delta){
        float angle = (float) Math.atan2(path.get(waypoint).y - getY(),    path.get(waypoint).x - getX());
        velocity.set((float) Math.cos(angle) * speed,(float) Math.sin(angle)*speed);
        rotation(angle);


        // if the last waypoint is reached, start again
        if(isWaypointReached()){
        if(waypoint + 1 >= path.size)
            waypoint = 0;
        else
            waypoint++;

        }


}

private void rotazione(float angle){
    setRotation(angle*MathUtils.radiansToDegrees); 
}

private boolean isWaypointReached() {
    return Math.abs(path.get(waypoint).x - getX()) <= speed * Gdx.graphics.getDeltaTime() 
            &&
            Math.abs(path.get(waypoint).y - getY()) <= speed * Gdx.graphics.getDeltaTime();
}

public Array<Vector2> getPath(){
    return path;
}
public int getWaypoint(){
    return waypoint;
}