Making A Sprite Bounce Off The Edge

Question

I'm trying to make a sprite bounce off the edge of the screen when it is less than 0. Right now it just zooms across the screen into the void. Here is my code-note that CentipedeBody is a class that extends Sprite. In the render method I call ex.update(); which is an object of the class. Then in between the batch.begin() and batch.end() I have batch.draw(ex,ex.getPosition().x,ex.getPosition().y,ex.getSize().x,ex.getSize().y);

public class CentipedeBody extends Sprite
{
   public CentipedeBody(TextureRegion image,Vector2 position,Vector2 size)  {

      super(new TextureRegion(image));

      this.position = position;
      this.size=size;
      bounds=new Rectangle(position.x,position.y,8,8);
      left=true;
   }

  public void update() {

        bounds.set(getPosition().x,getPosition().y,8,8);

        if (left==true) {
           position.x-=(.5f);
            up=false;
            down=false;
            right=false;
            left=true;
        }

        if (right==true) {
            position.x+=.5f;
            left=false;
            right=true;
            down=false;
            up=false;
        }
        if (down==true) {

            position.y-=(.5f);
            right=false;
            left=false;
            down=true;
            up=false;

            if(position.x<0)
            {
                left=false;
                right=true;
            }
        }
  }

Answer 1

why bounds in your child class, Sprite having already bounds, use that if you're interested in collision with other objects. Same for position and for size, I don't think you need these extra data member in your Child class, use parent x,y for position and width and height for dimension.

public class CentipedeBody extends Sprite {

    enum State{
        LEFT,RIGHT,DOWN
    }

    State currentState,previousState ;

    public static final float DOWN_MOVEMENT=50;
    public float downMovCounter;
    public float speed;

    public CentipedeBody(TextureRegion image, Vector2 position, Vector2 size) {
        super(new TextureRegion(image));
        setPosition(position.x,position.y);
        setSize(size.x,size.y);
        currentState=State.LEFT;
        previousState=State.LEFT;
        speed=50;
    }

    public void update() {

        float delta=Gdx.graphics.getDeltaTime();
        if(currentState ==State.LEFT){
            setPosition(getX()-speed*delta,getY());
            if(getX()<0) {
                previousState=currentState;
                currentState = State.DOWN;
            }
        }

        if(currentState ==State.RIGHT){
            setPosition(getX()+speed*delta,getY());
            if(getX()> Gdx.graphics.getWidth()-getWidth()) {
                previousState=currentState;
                currentState = State.DOWN;
            }
        }

        if(currentState ==State.DOWN){
            setPosition(getX(),getY()+speed*delta);
            downMovCounter++;
            if(downMovCounter>DOWN_MOVEMENT){
                downMovCounter=0;
                currentState =previousState==State.LEFT?State.RIGHT:State.LEFT;
            }

        }
    }

}

In render method

batch.begin();
batch.draw(centipedeBody,centipedeBody.getX(),centipedeBody.getY(),centipedeBody.getWidth(),centipedeBody.getHeight());
batch.end();
centipedeBody.update();

May be you need bounds, size and position in CentipedeBody, I can't judge your game requirement by one class code so you can easily integrate your variable in my code.