我使用Java awt，Swing和线程编写了Java中Galton Board的实现。我的程序有三个文本字段，可以同时选择插槽数，球数和球数，两个按钮用于显示，一个用于启动程序。我试着让它工作，就像我可以选择球的数量和点击开始和球自动从烟囱落下。目前，我的计划能够丢球并运行良好，但我不知道如何实施能够丢球的球。任何建议或帮助表示赞赏，谢谢。这是Main.Class
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.util.Random;
import javax.swing.*;
public class Main extends JFrame {
private String num_slots;
private String num_balls;
private String ball_free;
private JButton Display;
private JButton Start;
private JPanel textpanel;
private JPanel mainpanel;
private JPanel graphpanel;
public Main() {
textpanel = new JPanel();
textpanel.setLayout(new FlowLayout(FlowLayout.LEFT, 10, 20));
textpanel.add(new JLabel("Number of Slots"));
final JTextField text1 = new JTextField(10);
textpanel.add(text1);
textpanel.add(new JLabel("Number of Balls"));
final JTextField text2 = new JTextField(10);
textpanel.add(text2);
textpanel.add(new JLabel("How many balls can be freed"));
final JTextField text3 = new JTextField(10);
textpanel.add(text3);
Display = new JButton("Display");
textpanel.add(Display);
Start = new JButton("Start");
textpanel.add(Start);
// Create panel p2 to hold a text field and p1
mainpanel = new JPanel(new BorderLayout());
mainpanel.add(textpanel, BorderLayout.NORTH);
/*
* graphpanel = new JPanel(); graphpanel.setLayout(new
* BoxLayout(graphpanel, BoxLayout.Y_AXIS));
*/
add(mainpanel, BorderLayout.CENTER);
Display.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == Display) {
num_slots = text1.getText();
int slots = Integer.parseInt(num_slots);
num_balls = text2.getText();
int balls = Integer.parseInt(num_balls);
MainPanel pa = new MainPanel(slots, balls);
mainpanel.add(pa);
mainpanel.revalidate();
}
}
});
Start.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == Start) {
num_slots = text1.getText();
int slots = Integer.parseInt(num_slots);
num_balls = text2.getText();
int balls = Integer.parseInt(num_balls);
MainPanel pa = new MainPanel(slots, balls);
mainpanel.add(pa, BorderLayout.CENTER);
pa.start();
mainpanel.revalidate();
mainpanel.repaint();
}
}
});
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Main frame = new Main();
frame.setTitle("The Galton board");
frame.setSize(1000, 800);
frame.setLocationRelativeTo(null); // Center the frame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setAutoRequestFocus(true);
}
}
主面板类包含烟囱和球
import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;
import javax.swing.JPanel;
class MainPanel extends JPanel implements Runnable {
private int num;
private int number_ball;
public static int start_y = 100;
private float ball_x = 385;
private float ball_y = 50;
private float radius = 15;
private static int panel_x = 300;
private static int panel_y = 100;
private int diameter = 20;
private int last_x = 0;
private final static Random generator = new Random();
ArrayList<Balls> list_ball = new ArrayList<Balls>();
private int m_interval = 100;
private Timer m_timer;
public MainPanel() {
}
public MainPanel(int number) {
num = number;
}
public MainPanel(int number, int ball) {
num = number;
number_ball = ball;
for (int i = 1; i <= number_ball; i++)
{
list_ball.add(new Balls());
}
m_timer = new Timer(m_interval, new TimerAction());
}
public int getPanel_y() {
return panel_y;
}
public void start()
{
m_timer.setInitialDelay(250);
m_timer.start();
}
@Override
protected void paintComponent(Graphics g) {
int start_y = 100;
panel_x = 300;
panel_y = 100;
diameter = 20;
last_x = 0;
super.paintComponent(g);
if (num % 2 == 0) {
for (int i = 1; i <= num; i++) {
if ((i % 2) != 0) {
for (int k = 1; k <= num; k++) {
g.setColor(Color.BLUE);
g.fillOval(panel_x, panel_y, diameter, diameter);
panel_x = panel_x + 40;
}
} else if ((i % 2) == 0) {
for (int k = 1; k <= num + 1; k++) {
g.setColor(Color.BLUE);
g.fillOval(panel_x - 20, panel_y, diameter, diameter);
panel_x = panel_x + 40;
}
}
panel_y = panel_y + 40;
panel_x = 300;
}
} else if (num % 2 != 0) {
for (int i = 1; i <= num; i++) {
if ((i % 2) != 0) {
for (int k = 1; k <= num; k++) {
g.setColor(Color.BLUE);
g.fillOval(panel_x, panel_y, diameter, diameter);
panel_x = panel_x + 40;
}
} else if ((i % 2) == 0) {
for (int k = 1; k <= num + 1; k++) {
g.setColor(Color.BLUE);
g.fillOval(panel_x - 20, panel_y, diameter, diameter);
panel_x = panel_x + 40;
}
}
panel_y = panel_y + 40;
panel_x = 300;
}
}
for (int n = 40; n < panel_y - 40; n = n + 40) {
if (num % 2 == 0) {
g.drawLine(panel_x - 50 + n, panel_y - 10, panel_x - 50 + n,
panel_y + 80);
g.drawLine(panel_x, panel_y + 80, panel_x - 50 + n, panel_y + 80);
last_x = panel_x - 50 + n;
} else if (num % 2 != 0) {
g.drawLine(panel_x - 30 + n, panel_y - 10, panel_x - 30 + n,
panel_y + 80);
g.drawLine(panel_x, panel_y + 80, panel_x - 30 + n, panel_y + 80);
last_x = panel_x - 30 + n;
}
}
for (int i = 0; i< list_ball.size(); i++)
{
list_ball.get(i).draw(g);
}
}
class TimerAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
for (int i = 0; i< list_ball.size(); i++)
{
list_ball.get(i).move();
//return;
//m_timer.stop();
repaint();
}
}
球类
import java.awt.geom.Ellipse2D;
import java.util.Random;
import java.awt.*;
public class Balls {
private Ellipse2D.Double thisBall;
private int Ball_x;
private int Ball_y;
public int radius;
public int start_y;
private final static Random generator = new Random();
Mainpanel pa = new Mainpanel();
public Balls()
{
start_y = 100;
Ball_x = 385;
Ball_y = 50;
radius = 15;
}
public void draw(Graphics g)
{
g.setColor(Color.RED);
g.fillOval(Ball_x, Ball_y, radius, radius);
}
public void move()
{
if (Ball_y < pa.getPanel_y() + 65)
{
int direction = generator.nextInt(2);
Ball_y = Ball_y + 5;
if (Ball_y == start_y - 10 && start_y < pa.getPanel_y())
{
if (direction == 0)
{
Ball_x = Ball_x - 20;
}
else Ball_x = Ball_x + 20;
start_y = start_y + 40;
}
System.out.println(Ball_y);
System.out.println(pa.getPanel_y());
}
// Ball_x = Ball_x + 5;
}
}
答案 0 :(得分：3)
为Ball创建一个新的逻辑类，而不是GUI类，一个不扩展JPanel或任何Swing组件的逻辑类，而是一个具有Ball背后逻辑的逻辑类，也可能是一个接受a的渲染方法Graphics或Graphics2D对象。然后给你的绘图JPanel类一个这些Ball对象的ArrayList，在你的游戏循环中移动它们 - 注意我更喜欢使用Swing Timer而不是后台线程，然后在你的JPanel的paintComponent方法中迭代Ball的ArrayList，通过调用其渲染方法绘制每个Ball。
顺便说一句：所有类名都应以大写字母开头，除常量之外的所有标识符都应使用驼峰大小写，因此您的主面板类应命名为MainPanel。我编辑了你的代码，使代码格式化，并为你做了这个改变。
除了数字2：您当前的代码在paintComponent中有代码逻辑。不要这样做，因为那会弄乱你。您无法完全控制何时或甚至调用paintComponent。