tank/src/com/demo/tank/course6/Bullet.java

package com.demo.tank.course6;

import com.demo.tank.enums.Direction;
import com.demo.tank.enums.Group;
import com.demo.tank.util.ResourceManager;

import java.awt.*;

public class Bullet {
    private int x, y;
    private Direction direction;
    private static final int SPEED = 10;
    public static final int WIDTH = ResourceManager.bulletD.getWidth();
    public static final int HEIGHT = ResourceManager.bulletD.getHeight();
    private boolean live = true;
    private Group group = Group.BAD;
    private TankFrameV6 tf;
    Rectangle rect = new Rectangle();

    public Bullet(int x, int y, Direction direction, Group group, TankFrameV6 tf) {
        this.x = x;
        this.y = y;
        this.direction = direction;
        this.group = group;
        this.tf = tf;

        rect.x = this.x;
        rect.y = this.y;
        rect.width = Bullet.WIDTH;
        rect.height = Bullet.HEIGHT;
        tf.bullets.add(this);
    }

    public void paint(Graphics g){
        if(!live){
            tf.bullets.remove(this);
        }
        switch (direction){
            case UP:
                g.drawImage(ResourceManager.bulletU, x, y, null);
                break;
            case DOWN:
                g.drawImage(ResourceManager.bulletD, x, y, null);
                break;
            case LEFT:
                g.drawImage(ResourceManager.bulletL, x, y, null);
                break;
            case RIGHT:
                g.drawImage(ResourceManager.bulletR, x, y, null);
                break;
        }
        move();
    }

    private void move() {
        switch (direction){
            case UP: y -= SPEED;
                break;
            case DOWN: y += SPEED;
                break;
            case LEFT: x -= SPEED;
                break;
            case RIGHT: x += SPEED;
                break;
            default:
                break;
        }
        if(x < 0 || y < 0 || x > TankFrameV6.GAME_WIDTH || y > TankFrameV6.GAME_HEIGHT){
            live = false;
        }
        rect.x = this.x;
        rect.y = this.y;
    }

    //检测是否跟坦克碰撞
    public void collideWith(Tank tank){
        //关闭队友伤害
        if(this.group == tank.getGroup()) return;
        if(rect.intersects(tank.rect)){
            tank.die();
            this.die();
            //爆炸
            int ex = tank.getX() + Tank.WIDTH/2 - Explode.WIDTH/2;
            int ey = tank.getY() + Tank.HEIGHT/2 - Explode.HEIGHT/2;
            tf.explodes.add(new Explode(ex, ey , tf));
        }
    }

    private void die() {
        this.live = false;
    }

    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 Direction getDirection() {
        return direction;
    }

    public void setDirection(Direction direction) {
        this.direction = direction;
    }

    public boolean isLive() {
        return live;
    }

    public void setLive(boolean live) {
        this.live = live;
    }

    public Group getGroup() {
        return group;
    }

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