总纲：
上篇文章我们进行了线程的初步学习，接下来我们将用线程来解决无人机防空平台的开发。我们的目标是建立一个完善的功能系统，包含雷达扫描，追击敌机，补充弹药，停靠机场等功能。
一、窗体
无人机自动防空平台的第一步是要绘制窗体提供一个背景平台。我们目前是要通过按钮来生成无人机和入侵者，所以我们需要在窗体下面设置按钮，因为我们不采取流式布局，接下来添加按钮需要使用Jpanel面板。我会用代码来进行无人机自动防空平台窗体的绘制。
java
public class DroneUI extends JFrame {
ArrayList<Intruder> IntruderArrayList = new ArrayList<>();
ArrayList<Drone> droneArrayList = new ArrayList<>();
public DroneUI(){
setTitle("智能无人机平台");
setSize(1200,1000);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
JPanel jPanel = new JPanel();
jPanel.setBackground(Color.LIGHT_GRAY);
JButton button = new JButton("生产无人机");
jPanel.add(button);
JButton button1 = new JButton("生产入侵者");
jPanel.add(button1);
add(jPanel,BorderLayout.SOUTH);
setVisible(true);
Graphics g = this.getGraphics();
//无人机线程
DroneThread droneThread = new DroneThread(g);
//监听器
DroneListener droneListener = new DroneListener();
//按钮注册监听
button.addActionListener(droneListener);
button1.addActionListener(droneListener);
//将共享内存空间的数组 传入两个线程中
droneListener.droneArrayList=droneArrayList;//监听器线程
droneThread.droneArrayList=droneArrayList;//无人机线程
droneListener.IntruderArrayList=IntruderArrayList;
droneThread.IntruderArrayList=IntruderArrayList;
droneThread.start();
}
//绘制窗体 刷新窗体
public void paint(Graphics g){
super.paint(g);
}
public static void main(String[] args) {
new DroneUI();
}
}二、无人机和入侵者的生成
因为无人机和入侵者的数量是不固定的，所以我们需要将无人机和入侵者设置成类，类中包含无人机入侵者的属性和方法。
无人机
目前我们的无人机防空系统目前是一个很基础的初始板块儿，所以无人机先限制在一个红色框内移动。
属性：
java
//属性
int x,y;//坐标
int speedx,speedy;//速度
int size;//无人机尺寸
int state;//无人机状态
int stateSize;//无人机状态圆的大小
int scanSize;//雷达范围构造方法：
java
//构造方法
public Drone(int x,int y,int state,int speedx,int speedy){
this.x = x;
this.y = y;
this.state = state;
this.size = 30;
this.stateSize = 15;
this.scanSize = 100;
this.speedx = speedx;
this.speedy = speedy;
}用构造方法赋予无人机各属性的初始值或指定值。
绘制方法和移动方法：
java
// 方法
public void drawDrone(Graphics bg){
Color color1 = new Color(0,0,255,60);
bg.setColor(color1);
bg.fillOval(x,y,scanSize,scanSize);
Color color2 = new Color(64, 195, 66);
bg.setColor(color2);
bg.fillOval(x+35,y+35,size,size);
Color color3 = new Color(255, 0, 0);
bg.setColor(color3);
bg.fillOval(x+42,y+42,stateSize,stateSize);
}
public void move(){
if(x>600+300||x<200){
speedx=-speedx;
}
if(y>400+175||y<175){
speedy=-speedy;
}
x+=speedx;
y+=speedy;
}这就是无人机类所包含的内容，先定义属性，通过构造方法再赋予属性初始值，再绘制它的外观以及移动方法生成一个初始简易无人机。
入侵者
入侵者类与无人机类的方法大同小异。但是入侵者因为并不在红色框内移动，所以它的移动和反弹范围要有所调整。
属性
java
int x,y,speedx,speedy,size;
int blood;构造方法
java
public Intruder(int x,int y,int size,int speedx,int speedy){
this.x = x;
this.y = y;
this.speedx = speedx;
this.speedy = speedy;
this.size = size;
this.blood=100;
}绘制和移动方法
java
public void drawIntruder(Graphics g){
if(blood<=0){
return;
}
g.setColor(Color.BLACK);
g.fillOval(x,y,size,size);
// g.setColor(Color.RED);
// g.drawOval(x-1,y-1,size+2,size+2);
}
public void move (){
if(blood<=0){
return;
}
if(x>1200-size||x<10){
speedx=-speedx;
}
if(y>750-size||y<10){
speedy=-speedy;
}
x+=speedx;
y+=speedy;
}
}三、多线程运行
无人机和入侵者的运行在我们的初始代码下会呈现下图状态，这并不是我们想要的结果。所以我们可以把它们绘制在图片上，然后让图片不断的刷新窗体来达到呈现无人机运行轨迹的目的。此时我们就需要用到线程的知识。
java
public class DroneThread extends Thread{
ArrayList<Drone> droneArrayList;
ArrayList<Intruder> IntruderArrayList;
Graphics g;
public DroneThread(Graphics g){
this.g=g;
}
@Override
public void run() {
while (true) {
BufferedImage image = new BufferedImage(1200,750,2);
Graphics bg = image.getGraphics();
bg.setColor(Color.WHITE);
bg.fillRect(0,0,1200,750);
bg.setColor(Color.RED);
bg.drawRect(200,175,800,500);
//遍历无人机数组 取出无人机对象 调用绘制 和移动的方法
for (int j = 0; j <droneArrayList.size() ; j++) {
Drone drone = droneArrayList.get(j);
drone.drawDrone(bg);
drone.move();
}
for (int j = 0; j <IntruderArrayList.size() ; j++) {
Intruder intruder = IntruderArrayList.get(j);
intruder.drawIntruder(bg);
intruder.move();
}
// 检测周围是否有颜色变化
if(droneArrayList.size()>0) {
//System.out.println("进入检测~");
Drone drone = droneArrayList.get(0);
for (int i = drone.x; i <drone.x+ drone.scanSize; i++) {
for (int j = drone.y; j < drone.y+drone.scanSize; j++) {
int colorNum = image.getRGB(i , j);
Color color = new Color(colorNum);
if ((color.getRed() + color.getBlue() + color.getGreen()) / 3 < 10) {
System.out.println("雷达扫描到了~");
}
}
}
}
g.drawImage(image,0,0,null);
try {
Thread.sleep(15);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
}在这里我设置的间隔时间是15ms，使无人机和入侵者的运行速度较为均衡
什么是 ArrayList
ArrayList<Drone> droneList = new ArrayList<>(); 含义：
-
动态数组
-
里面装的是
Drone对象
为什么不用普通数组？
| 数组 | ArrayList |
|---|---|
| 长度固定 | 可变 |
| 不方便增删 | 很方便 |
仿真程序一定要用 ArrayList，是多个线程共享的数据
四、监听器
java
public class DroneListener implements ActionListener {
ArrayList<Drone> droneArrayList;
ArrayList<Intruder> IntruderArrayList;
Random random = new Random();
public void actionPerformed(ActionEvent e){
String ac = e.getActionCommand();
if (ac.equals("生产无人机")){
int x = random.nextInt(700)+200;
int y = random.nextInt(400)+175;
int speedx = random.nextInt(5)-2;//-2-2
int speedy = random.nextInt(5)-2;//-2-2
Drone drone = new Drone(x,y,0,speedx,speedy);
droneArrayList.add(drone);
} else if (ac.equals("生产入侵者")) {
int x = random.nextInt(1150);
int y = random.nextInt(705);
while (true){
if (x<200||x>1000||y<175||y>775) {
break;
}
x = random.nextInt(1150);
y = random.nextInt(900);
}
int speedx = random.nextInt(5)-2;//-2-2
int speedy = random.nextInt(5)-2;//-2-2
Intruder intruder = new Intruder(x, y, 45, speedx, speedy);
IntruderArrayList.add(intruder);
}
}
}完整代码如下：
DroneUI类
java
import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;
public class DroneUI extends JFrame {
ArrayList<Intruder> IntruderArrayList = new ArrayList<>();
ArrayList<Drone> droneArrayList = new ArrayList<>();
public DroneUI(){
setTitle("智能无人机平台");
setSize(1200,1000);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
JPanel jPanel = new JPanel();
jPanel.setBackground(Color.LIGHT_GRAY);
JButton button = new JButton("生产无人机");
jPanel.add(button);
JButton button1 = new JButton("生产入侵者");
jPanel.add(button1);
add(jPanel,BorderLayout.SOUTH);
setVisible(true);
Graphics g = this.getGraphics();
//无人机线程
DroneThread droneThread = new DroneThread(g);
//监听器
DroneListener droneListener = new DroneListener();
//按钮注册监听
button.addActionListener(droneListener);
button1.addActionListener(droneListener);
//将共享内存空间的数组 传入两个线程中
droneListener.droneArrayList=droneArrayList;//监听器线程
droneThread.droneArrayList=droneArrayList;//无人机线程
droneListener.IntruderArrayList=IntruderArrayList;
droneThread.IntruderArrayList=IntruderArrayList;
droneThread.start();
}
//绘制窗体 刷新窗体
public void paint(Graphics g){
super.paint(g);
}
public static void main(String[] args) {
new DroneUI();
}
}Drone类
java
import java.awt.*;
public class Drone {
//属性
int x,y,speedx,speedy,size;
int state;
int stateSize;
int scanSize;
//构造方法
public Drone(int x,int y,int state,int speedx,int speedy){
this.x = x;
this.y = y;
this.state = state;
this.size = 30;
this.stateSize = 15;
this.scanSize = 100;
this.speedx = speedx;
this.speedy = speedy;
}
// 方法
public void drawDrone(Graphics bg){
Color color1 = new Color(0,0,255,60);
bg.setColor(color1);
bg.fillOval(x,y,scanSize,scanSize);
Color color2 = new Color(64, 195, 66);
bg.setColor(color2);
bg.fillOval(x+35,y+35,size,size);
Color color3 = new Color(255, 0, 0);
bg.setColor(color3);
bg.fillOval(x+42,y+42,stateSize,stateSize);
}
public void move(){
if(x>600+300||x<200){
speedx=-speedx;
}
if(y>400+175||y<175){
speedy=-speedy;
}
x+=speedx;
y+=speedy;
}
}Intruder类
java
import java.awt.*;
public class Intruder {
int x,y,speedx,speedy,size;
int blood;
public Intruder(int x,int y,int size,int speedx,int speedy){
this.x = x;
this.y = y;
this.speedx = speedx;
this.speedy = speedy;
this.size = size;
this.blood=100;
}
public void drawIntruder(Graphics g){
if(blood<=0){
return;
}
g.setColor(Color.BLACK);
g.fillOval(x,y,size,size);
// g.setColor(Color.RED);
// g.drawOval(x-1,y-1,size+2,size+2);
}
public void move (){
if(blood<=0){
return;
}
if(x>1200-size||x<10){
speedx=-speedx;
}
if(y>750-size||y<10){
speedy=-speedy;
}
x+=speedx;
y+=speedy;
}
}线程类
java
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
public class DroneThread extends Thread{
ArrayList<Drone> droneArrayList;
ArrayList<Intruder> IntruderArrayList;
Graphics g;
public DroneThread(Graphics g){
this.g=g;
}
@Override
public void run() {
while (true) {
BufferedImage image = new BufferedImage(1200,750,2);
Graphics bg = image.getGraphics();
bg.setColor(Color.WHITE);
bg.fillRect(0,0,1200,750);
bg.setColor(Color.RED);
bg.drawRect(200,175,800,500);
//遍历无人机数组 取出无人机对象 调用绘制 和移动的方法
for (int j = 0; j <droneArrayList.size() ; j++) {
Drone drone = droneArrayList.get(j);
drone.drawDrone(bg);
drone.move();
}
for (int j = 0; j <IntruderArrayList.size() ; j++) {
Intruder intruder = IntruderArrayList.get(j);
intruder.drawIntruder(bg);
intruder.move();
}
// 检测周围是否有颜色变化
if(droneArrayList.size()>0) {
//System.out.println("进入检测~");
Drone drone = droneArrayList.get(0);
for (int i = drone.x; i <drone.x+ drone.scanSize; i++) {
for (int j = drone.y; j < drone.y+drone.scanSize; j++) {
int colorNum = image.getRGB(i , j);
Color color = new Color(colorNum);
if ((color.getRed() + color.getBlue() + color.getGreen()) / 3 < 10) {
System.out.println("雷达扫描到了~");
}
}
}
}
g.drawImage(image,0,0,null);
try {
Thread.sleep(15);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
}监听器类
java
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Random;
public class DroneListener implements ActionListener {
ArrayList<Drone> droneArrayList;
ArrayList<Intruder> IntruderArrayList;
Random random = new Random();
public void actionPerformed(ActionEvent e){
String ac = e.getActionCommand();
if (ac.equals("生产无人机")){
int x = random.nextInt(700)+200;
int y = random.nextInt(400)+175;
int speedx = random.nextInt(5)-2;//-2-2
int speedy = random.nextInt(5)-2;//-2-2
Drone drone = new Drone(x,y,0,speedx,speedy);
droneArrayList.add(drone);
} else if (ac.equals("生产入侵者")) {
int x = random.nextInt(1150);
int y = random.nextInt(705);
while (true){
if (x<200||x>1000||y<175||y>775) {
break;
}
x = random.nextInt(1150);
y = random.nextInt(900);
}
int speedx = random.nextInt(5)-2;//-2-2
int speedy = random.nextInt(5)-2;//-2-2
Intruder intruder = new Intruder(x, y, 45, speedx, speedy);
IntruderArrayList.add(intruder);
}
}
}