坦克大战练习设计模式

利用装饰者模式可以有效的较少类的数量，提高同一代码的利用率。其核心将被装饰的类聚合在装饰类中，通过调用装饰类，来达到对类装饰的目的

类图：

装饰者模式.jpg

原有类父类

package com.wwj.tank;

import java.awt.*;

/**
 * 所有游戏物体的父类
 */
public abstract class GameObject {

    int x,y;

    public abstract void paint(Graphics g);

    public abstract int getWidth();

    public abstract int getHeight();
}

package com.wwj.tank;

import java.awt.*;

public class Bullert extends GameObject{
    public static int WIDTH = ResourceMgr.INSTANCE.getBulletD().getWidth();
    public static int HEIGHT = ResourceMgr.INSTANCE.getBulletD().getHeight();

    Rectangle rect = new Rectangle();
    private Dir dir;
    private Boolean living = true;
    private int speed = 10;
    private Group group;
    private boolean canDie = true;

    public Bullert(int x, int y,Dir dir,Group group) {
        this.x = x;
        this.y = y;
        this.dir = dir;
        this.group = group;
        rect.x = x;
        rect.y = y;
        rect.width = WIDTH;
        rect.height = HEIGHT;
    }
    @Override
    public void paint(Graphics g) {
        if(dir == Dir.UP){g.drawImage(ResourceMgr.INSTANCE.getBulletU(),x,y,null);}
        if(dir == Dir.RIGHT){g.drawImage(ResourceMgr.INSTANCE.getBulletR(),x,y,null);}
        if(dir == Dir.DOWN){g.drawImage(ResourceMgr.INSTANCE.getBulletD(),x,y,null);}
        if(dir == Dir.LEFT){g.drawImage(ResourceMgr.INSTANCE.getBulletL(),x,y,null);}
        move();
        if(!living){
            GameMode.getInstance().remove(this);
        }
    }

    @Override
    public int getWidth() {
        return WIDTH;
    }

    @Override
    public int getHeight() {
        return HEIGHT;
    }

    private void move() {
        if(dir == Dir.UP){y -= speed;}
        if(dir == Dir.RIGHT){x += speed;}
        if(dir == Dir.DOWN){y += speed;}
        if(dir == Dir.LEFT){x -= speed;}

        rect.x = this.x;
        rect.y = this.y;

        if(x<0 || y<0 || x>GameMode.GAMEWIDTF || y>GameMode.GAMEHEIGHT){
            this.living = false;
        }
    }

    //子弹消亡
    public void die() {
        if(canDie){
            this.living = false;
        }
    }

    public int getSpeed() {
        return speed;
    }

    public void setSpeed(int speed) {
        this.speed = speed;
    }

    public boolean isCanDie() {
        return canDie;
    }

    public void setCanDie(boolean canDie) {
        this.canDie = canDie;
    }

    public static int getWIDTH() {
        return WIDTH;
    }

    public static void setWIDTH(int WIDTH) {
        Bullert.WIDTH = WIDTH;
    }

    public static int getHEIGHT() {
        return HEIGHT;
    }

    public static void setHEIGHT(int HEIGHT) {
        Bullert.HEIGHT = HEIGHT;
    }

    public Rectangle getRect() {
        return rect;
    }

    public void setRect(Rectangle rect) {
        this.rect = rect;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public Dir getDir() {
        return dir;
    }

    public void setDir(Dir dir) {
        this.dir = dir;
    }

    public Boolean getLiving() {
        return living;
    }

    public void setLiving(Boolean living) {
        this.living = living;
    }

    public Group getGroup() {
        return group;
    }

    public void setGroup(Group group) {
        this.group = group;
    }
}

package com.wwj.tank;

import java.awt.*;

public abstract class GODecorator  extends GameObject{

    GameObject go;

    public GODecorator(GameObject go){
        this.go = go;
    }

    @Override
    public void paint(Graphics g) {
        super.x = go.x;
        super.y =go.y;
        go.paint(g);
    }
}

package com.wwj.tank;

import java.awt.*;

public class TailDecorator extends GODecorator{

    public TailDecorator(GameObject go) {
        super(go);
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        Color c = g.getColor();
        g.setColor(Color.YELLOW);
        g.drawRect(this.x,this.y,go.getWidth(),go.getHeight());
        g.setColor(c);
    }

    @Override
    public int getWidth() {
        return 0;
    }

    @Override
    public int getHeight() {
        return 0;
    }
}

package com.wwj.tank;

public class FireGeneral implements Fire {
    @Override
    public void fire(Tank tank) {
        int bx = tank.getX() + Tank.WIDTH/2 - Bullert.WIDTH/2;
        int by = tank.getY() + Tank.WIDTH/2 - Bullert.WIDTH/2;

        Bullert bullert = new Bullert(bx, by, tank.getDir(), tank.getGroup());
        bullert.setSpeed(10);
        TailDecorator tailDecorator = new TailDecorator(bullert);

        GameMode.getInstance().add(tailDecorator);
    }
}