JAVA之坦克大战（二）我方坦克移动

思路：写出我方坦克的上下左右的移动方法，在MyPanel类里继承Keylistener接口，重写三个方法

在KeyPressed方法中写出上写左右四个动作对应的四个方向，和方法，然后重绘

MyPanel类：

import javafx.scene.input.KeyCode;
import javax.swing.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.*;
import java.util.Vector;

public class MyPanel extends Panel implements KeyListener {
    MyTank myTank = null;
    Vector enemyTanks = new Vector();//集合类
    int enemynum = 12;//坦克数量

    MyPanel() {
        myTank = new MyTank(120, 220);//初始化我的坦克的初始坐标
        myTank.setSpeed(5);
        for (int i = 0; i < enemynum / 2; i++) {
            EnemyTank enemyTank = new EnemyTank(i * (230 + 5), 0);//给上面的enemyTank初始化坐标
            enemyTanks.add(enemyTank);//向集合里面添加enemyTank
        }

        for (int i = 6; i < enemynum; i++) {
            EnemyTank enemyTank = new EnemyTank((12 - i - 1) * (230 + 5), 930);//给下面的enemyTank初始化坐标
            enemyTanks.add(enemyTank);
        }
    }

    public void paint(Graphics g) //重写paint方法
    {

        g.setColor(Color.black);//画笔着色
        g.fillRect(0, 0, 1200, 1000);//面板
        if (myTank.life) {
            drawTank(myTank.getX(), myTank.getY(), myTank.getDir(), g, 0);//画我方坦克
        }

        for (int i = 0; i < enemyTanks.size(); i++) {
            EnemyTank enemyTank = enemyTanks.get(i);
            drawTank(enemyTank.getX(), enemyTank.getY(), enemyTank.getDir(), g, 1);//画敌方坦克
        }
    }

    public void drawTank(int x, int y, int dir, Graphics g, int type)//画坦克
    {
        //System.out.println(dir);
        switch (type) {
            case 0://我方
                g.setColor(Color.red);
                break;
            case 1://敌方
                g.setColor(Color.green);
                break;
        }

        switch (dir) {
            case 0://上
                g.fill3DRect(x, y, 5, 30, false);//左腿
                g.fill3DRect(x + 15, y, 5, 30, false);//右腿
                g.fill3DRect(x + 5, y + 5, 10, 20, false);//中间
                g.fillOval(x + 5, y + 10, 10, 10);//圆形
                g.drawLine(x + 10, y + 15, x + 10, y - 3);//炮管
                break;
            case 1://左
                g.fill3DRect(x, y, 30, 5, false);
                g.fill3DRect(x, y + 15, 30, 5, false);
                g.fill3DRect(x + 5, y + 5, 20, 10, false);
                g.fillOval(x + 10, y + 5, 10, 10);
                g.drawLine(x + 15, y + 10, x - 3, y + 10);
                break;
            case 2://下
                g.fill3DRect(x, y, 5, 30, false);
                g.fill3DRect(x + 15, y, 5, 30, false);
                g.fill3DRect(x + 5, y + 5, 10, 20, false);
                g.fillOval(x + 5, y + 10, 10, 10);
                g.drawLine(x + 10, y + 15, x + 10, y + 33);
                break;
            case 3://右
                g.fill3DRect(x, y, 30, 5, false);
                g.fill3DRect(x, y + 15, 30, 5, false);
                g.fill3DRect(x + 5, y + 5, 20, 10, false);
                g.fillOval(x + 10, y + 5, 10, 10);
                g.drawLine(x + 15, y + 10, x + 33, y + 10);
                break;
        }
    }

    public void keyReleased(KeyEvent e){};
    public void keyTyped(KeyEvent e){};
    public void keyPressed(KeyEvent e)
    {
        if(e.getKeyCode()==KeyEvent.VK_W)
        {
            myTank.up();
            myTank.setDir(0);
        }
        else if(e.getKeyCode()==KeyEvent.VK_S)
        {
            myTank.down();
            myTank.setDir(2);
        }
        else if(e.getKeyCode()==KeyEvent.VK_A)
        {
            myTank.left();
            myTank.setDir(1);
        }
        else if(e.getKeyCode()==KeyEvent.VK_D)
        {
            myTank.right();
            myTank.setDir(3);
        }
        this.repaint();
    }
}

MyTank类：

public class MyTank extends Tank {
    MyTank(int x,int y)
    {
        super(x,y);
    }
    public void up()
    {
        setY(getY()-getSpeed());
    }
    public  void down()
    {
        setY(getY()+getSpeed());
    }
    public  void left()
    {
        setX(getX()-getSpeed());
    }
    public  void right()
    {
        setX(getX()+getSpeed());
    }
}