问围绕一个雪碧- 2d蠕虫风格的游戏？(LibGDX)

EN

package com.supermegabrobro.apoca.Sprites;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.CircleShape;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.supermegabrobro.apoca.Screens.PlayScreen;

    public class ArmyDude extends Sprite {
PlayScreen playScreen;
BodyDef bodyDef;
Body body;
FixtureDef fixtureDef;

boolean crossHairShowing = false;

Texture crossHairTexture;
float crossHairDistance = 30f;
float crossHairAngle = 45f;
Vector2 crossHairPosition;


public ArmyDude(PlayScreen playScreen){
    super(new Texture("armydude.png"));
    this.playScreen = playScreen;
    bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.DynamicBody;
    bodyDef.position.set(0,0);   // TODO: Make this random

    body = playScreen.world.createBody(bodyDef);
    CircleShape circleShape = new CircleShape();
    circleShape.setRadius(getWidth() / 2);
    fixtureDef = new FixtureDef();
    fixtureDef.shape = circleShape;
    body.createFixture(fixtureDef);

    crossHairTexture = new Texture("crosshair.png");
    crossHairPosition = new Vector2(0,0);





}

public void update(float dt){
    setPosition(body.getPosition().x - getWidth() / 2, body.getPosition().y - getHeight() / 2);

    if(Gdx.input.isKeyPressed(Input.Keys.UP)){
        crossHairShowing = true;
    }
}


@Override
public void draw(Batch batch) {
    super.draw(batch);
    if (crossHairShowing){

    }
}
}