手把手一步一步教你使用Java开发一个大型街机动作闯关类游戏14之人身攻击范围指定与获取

冲突范围

GameObject.java

public abstract class GameObject{
    private Transform _transform;
    private double _z;

    private Shape _collideBox;
    
    private int _colliderX = 0;
    private int _colliderY = 0;
    private int _colliderXscale = 0;
    private int _colliderYscale = 0;
    
    public GameObject(Transform trans,
                      int hurtx, int hurty, int hurtscale_x, int hurtscale_y){
        _transform = trans;
        this.setCollider(hurtx, hurty, hurtscale_x, hurtscale_y);
    }
    

    public Transform getTransform(){
        return _transform;
    }
    

    public void move(double x,double y){
        _z += y;
        _transform.translate(x,y);
    }


    public Shape getHurtBox(){
        AffineTransform as = new AffineTransform();
        as.setTransform(_transform.getTransform());
        _collideBox = as.createTransformedShape(new Rectangle(_colliderX,_colliderY,_colliderXscale,
                                                            _colliderYscale));
        return _collideBox;
    }
    

    public void setCollider(int x1,int y1, int x2, int y2){
        _colliderX = x1;
        _colliderY = y1;
        _colliderXscale = x2;
        _colliderYscale = y2;
    }

    public abstract void update(Graphics2D g);

    public double getZ(){
        return _z;
    }
    public void setZ(double z){
        _z = z;
    }
    public double getX(){
        return _transform.getX();
    }
    public double getY(){
        return  _transform.getY();
    }
}

getHurtBox的createTransformedShape是一个重要的方法，有必要解释一下：作用是基于sprite当前位置获取传入参数指定的矩形。

很多实体都有一个HurtBox（伤害盒子，用于人身攻击，冲突检测），故我们定义个基类GameObject，里面有2个主要的方法：
setCollider用来设置盒子范围；
getHurtBox返回当前对象的伤害盒子

让Player继承GameObject

public class Player extends GameObject{

 public Player(Animator animator, int hurtx, int hurty, int hurtscale_x, int hurtscale_y){
        super(animator,hurtx,hurty,hurtscale_x,hurtscale_y);
        _animator = animator;
        _animator.setAnimation("idle");
    }

并在初始化时设置范围：
GameApp.java

    Animator animator = new Animator(Config.PLAYER_JASMIN);
    _player = new Player(animator,60,44,18,98);

    

GameApp.java
我们可以通过调用以下方法，可视化player的被攻击范围
_gameLoop()

    g.setColor(Color.red);
    g.draw(_player.getHurtBox());

如果您迷路了，请参考完整源码：

项目源码

项目源码