Plane类
package com.bjsxt;
import java.awt.*;
import java.awt.event.KeyEvent;
public class Plane extends GameObject{
boolean left,up,right,down;
boolean live=true;
@Override
public void drawMySelf(Graphics g) {
super.drawMySelf(g);
if (left) {
x -=speed;
}
if (right) {
x +=speed;
}
if (up) {
y -=speed;
}
if (down) {
y +=speed;
}
}
public void addDirection(KeyEvent e){
switch (e.getKeyChar()){
case KeyEvent.VK_LEFT:
left=true;
break;
case KeyEvent.VK_RIGHT:
right=true;
break;
case KeyEvent.VK_UP:
up=true;
break;
case KeyEvent.VK_DOWN:
down=true;
break;
}
}
public void minusDirection(KeyEvent e){
switch (e.getKeyChar()){
case KeyEvent.VK_LEFT:
left=false;
break;
case KeyEvent.VK_RIGHT:
right=false;
break;
case KeyEvent.VK_UP:
up=false;
break;
case KeyEvent.VK_DOWN:
down=false;
break;
}
}
public Plane(Image img, int x, int y, int speed) {
super(img, x, y, speed);
}
}GameObject类
package com.bjsxt;
import java.awt.*;
//游戏物体的根类
public class GameObject {
Image img; //对应的图片
int x,y; //坐标
int speed; //物体的移动速度
int width,height; //物体的宽度和高度
//画自己
public void drawMySelf(Graphics g){
g.drawImage(img,x,y,width,height,null);
}
//返回该物体对应的矩形
public Rectangle getRec(){
return new Rectangle(x,y,width,height);
}
public GameObject(Image img, int x, int y, int speed, int width, int height) {
this.img = img;
this.x = x;
this.y = y;
this.speed = speed;
this.width = width;
this.height = height;
}
public GameObject(Image img, int x, int y, int speed) {
this(img,x,y);
this.speed = speed;
}
public GameObject(Image img, int x, int y) {
this(img);
this.x = x;
this.y = y;
}
public GameObject(Image img) {
this.img = img;
if(this.img!=null){
this.width=img.getWidth(null);
this.height=img.getHeight(null);
}
}
public GameObject(){}
}MyGameFrame类
package com.bjsxt;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import static com.bjsxt.GameUtil.*;
public class MyGameFrame extends Frame{
Image bgImg= GameUtil.getImage("images/bg.jpg");
Image planeImg = GameUtil.getImage("images/plane.png");
Plane plane=new Plane(planeImg,200,200,7);
int x=200,y=200;
//初始化窗口
public void launchFrame(){
this.setTitle("飞机大战--北京尚学堂");
this.setVisible(true);//
this.setSize(FRAME_WIDTH,FRAME_HIGHT);
this.setLocation(300,300);
//增加关闭窗口动作
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
//启动窗口绘制线程
new PaintThread().start();
//启动键盘监听
this.addKeyListener(new KeyMonitor());
}
@Override
public void paint(Graphics g){
g.drawImage(bgImg,0,0,FRAME_HIGHT,FRAME_HIGHT,null);
plane.drawMySelf(g);
}
//键盘监听内部类
class KeyMonitor extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
plane.addDirection(e);
}
@Override
public void keyReleased(KeyEvent e) {
plane.minusDirection(e);
}
}
//重画线程
class PaintThread extends Thread{
@Override
public void run(){
while ((true)){
repaint();
try {
Thread.sleep(40);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
MyGameFrame frame = new MyGameFrame();
frame.launchFrame();
}
private Image offScreenImage=null;
public void update(Graphics g){
if(offScreenImage==null)
offScreenImage=this.createImage(FRAME_WIDTH, FRAME_HIGHT);
Graphics gOff=offScreenImage.getGraphics();
paint(gOff);
g.drawImage(offScreenImage,0,0,null);
}
}程序能正常运行，但是按键后飞机动不起来，想问问老师是什么原因，检查了几遍还是没发现问题
老师，都是跟着视频敲的，也重启过idea，但是还是一运行就出现这样的问题
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