qq_41675408的博客

public abstract class FlyingObject { public static final int LIFE = 0; //活着呢 public static final int DEAD = 1; //死了的(先爆破) public static final int REMOVE = 2; //删除了(爆破后删除) protected int state = LIFE; //当前状态(默认活着) protected int width; //宽 protected int height; //高 protected int x; //x坐标 protected int y; //y坐标 /** 无参构造方法 */ public FlyingObject(){ } /**专门给小敌机、大敌机、小蜜蜂提供的构造方法 */ public FlyingObject(int width,int height){ this.width = width; this.height = height; Random rand = new Random(); x = rand.nextInt(World.WIDTH-width); //x:0到(窗口-小敌机的宽)之间的随机数 y = -height; //y:负的小敌机的高 } /** 专门给英雄机、子弹、天空提供的构造方法 */ public FlyingObject(int width,int height,int x,int y){ this.width = width; this.height = height; this.x = x; this.y = y; } /** 读取图片 */ public static BufferedImage loadImage(String fileName){ try{ BufferedImage img = ImageIO.read(FlyingObject.class.getResource(fileName)); return img; }catch(Exception e){ e.printStackTrace(); throw new RuntimeException(); } } /** 飞行物移动了 */ public abstract void step(); public abstract BufferedImage getImage(); /** 判断是否活着 */ public boolean isLife(){ return state==LIFE; } /** 判断是否死了的 */ public boolean isDead(){ return state==DEAD; } /** 判断是否删除的 */ public boolean isRemove(){ return state==REMOVE; } /** 画对象 g:画笔 */ public void paintObject(Graphics g){ g.drawImage(getImage(), x, y, null); } /** 检测飞行物是否越界 */ public abstract boolean outOfBounds(); /** 敌人与子弹/英雄机的碰撞 this:敌人 other:子弹或英雄机 */ public boolean hit(FlyingObject other){ int x1 = this.x-other.width; //x1:敌人的x int x2 = this.x+this.width; //x2:敌人的x int y1 = this.y-other.height; //y1:敌人的y int y2 = this.y+this.height; //y2:敌人的y int x = other.x; //x:子弹的x int y = other.y; //y:子弹的y return x>=x1 && x=y1 && y<=y2; } public void goDead(){ state = DEAD; //修改当前状态为死了的 } }