小球碰撞(多线程)

这篇博客介绍了如何使用Java Swing创建一个GUI应用,模拟小球碰撞的效果。通过多线程技术,每个小球都有自己的运动轨迹,并在边界上反弹。用户可以点击开始按钮来启动小球的运动,程序会不断更新并重绘小球的位置,展示了一个简单的多线程与图形用户界面交互的实例。

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package main;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;

public class Ball {
	private static final int XSIZE = 15;
	private static final int YSIZE = 15;
	private double x = 0;
	private double y = 0;
	private double dx = 1;
	private double dy = 1;
	public Ball()
	{
		x = Math.random() * (450 - XSIZE);
		y = Math.random() * (350 - YSIZE); 
		
	}
	public void move(Rectangle2D bounds)
	{
		x += dx;
		y += dy;
		if (x < bounds.getMinX())
		{
			x = bounds.getMinX();
			dx = -dx;
		}
		if (y < bounds.getMinY())
		{
			y = bounds.getMinY();
			dy = -dy;
		}
		if (x + XSIZE > bounds.getMaxX())
		{
			x = bounds.getMaxX() - XSIZE;
			dx = -dx;
			
		}
		if (y + YSIZE > bounds.getMaxY())
		{
			y = bounds.getMaxY() - YSIZE;
			dy = -dy;
			
		}
	}
	
	public Ellipse2D getShape()
	{
		return new Ellipse2D.Double(x, y, XSIZE, YSIZE);
		
	}
	
	

}
package main;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.ArrayList;
import java.awt.Dimension;
import javax.swing.JPanel;

public class BallPanel extends JPanel
{
	private static final int DEFAULT_WIDTH = 450;
	private static final int DEFAULT_HEIGHT = 350;
	//Ball ball;
	ArrayList<Ball> BallList;
	public BallPanel()
	{
		BallList = new ArrayList<Ball>();
	}
	public Ball add()
	{
		Ball tmp = new Ball();
		BallList.add(tmp);
		return tmp;
	}
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		Graphics2D g2 = (Graphics2D) g;
		for (Ball ball : BallList)
		{
			g2.fill(ball.getShape());
		}
		
		//ball.move(getBounds());
	}
	public Dimension getPreferredSize()
	{
		return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT);
	}

}
class BallThread extends Thread
{
	BallPanel panel;
	Ball ball;
	public BallThread(Ball ball, BallPanel panel)
	{
		this.ball = ball;
		this.panel = panel;
		
	}
	
	public void run()
	{
		
		while (true)
		{
			
			ball.move(panel.getBounds());
			try
			{
				Thread.sleep(1);
			}
			catch (InterruptedException ex)
			{
				ex.printStackTrace();
			}
			panel.repaint();
		}
	}
}


package main;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.EventQueue;

public class BallFrame extends JFrame 
{
	BallPanel panel;
	public BallFrame()
	{
		panel = new BallPanel();
		add(panel, BorderLayout.CENTER);
		JButton button1 = new JButton("start");
		JPanel ButtonPanel = new JPanel();
		
		
		button1.addActionListener(new ActionListener()
				{

					@Override
					public void actionPerformed(ActionEvent arg0) {
						// TODO Auto-generated method stub
						BallThread thread = new BallThread(panel.add(), panel);
						thread.start();
						
						
					}
			
				}
		);
		ButtonPanel.add(button1);
		add(ButtonPanel, BorderLayout.SOUTH);
		
				
	}
	public static void main(String[] args)
	{
		EventQueue.invokeLater(new Runnable()
				{

					@Override
					public void run() {
						// TODO Auto-generated method stub
		
						BallFrame frame = new BallFrame();
						frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
						frame.setSize(500, 500);
						frame.setVisible(true);
		
					}
			
				}
		);
		
		
		
	}
	

}


各个小球在一起碰撞实例··· // FallDlg.cpp : implementation file // #include "stdafx.h" #include "Fall.h" #include "FallDlg.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CAboutDlg dialog used for App About class CAboutDlg : public CDialog { public: CAboutDlg(); // Dialog Data //{{AFX_DATA(CAboutDlg) enum { IDD = IDD_ABOUTBOX }; //}}AFX_DATA // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CAboutDlg) protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support //}}AFX_VIRTUAL // Implementation protected: //{{AFX_MSG(CAboutDlg) //}}AFX_MSG DECLARE_MESSAGE_MAP() }; CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) { //{{AFX_DATA_INIT(CAboutDlg) //}}AFX_DATA_INIT } void CAboutDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CAboutDlg) //}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) //{{AFX_MSG_MAP(CAboutDlg) // No message handlers //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CFallDlg dialog CFallDlg::CFallDlg(CWnd* pParent /*=NULL*/) : CDialog(CFallDlg::IDD, pParent) { //{{AFX_DATA_INIT(CFallDlg) // NOTE: the ClassWizard will add member initialization here //}}AFX_DATA_INIT // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } void CFallDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CFallDlg) // NOTE: the ClassWizard will add DDX and DDV calls here //}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CFallDlg, CDialog) //{{AFX_MSG_MAP(CFallDlg) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CFallDlg message handlers BOOL CFallDlg::OnInitDialog() { CDialog::OnInitDialog(); // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range. ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE); if (pSysMenu != NULL) { CString strAboutMenu; strAboutMenu.LoadString(IDS_ABOUTBOX); if (!strAboutMenu.IsEmpty()) { pSysMenu->AppendMenu(MF_SEPARATOR); pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } } // Set the icon for this dialog. The framework does this automatically // when the application's main window is not a dialog SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon // TODO: Add extra initialization here return TRUE; // return TRUE unless you set the focus to a control } void CFallDlg::OnSysCommand(UINT nID, LPARAM lParam) { if ((nID & 0xFFF0) == IDM_ABOUTBOX) { CAboutDlg dlgAbout; dlgAbout.DoModal(); } else { CDialog::OnSysCommand(nID, lParam); } } // If you add a minimize button to your dialog, you will need the code below // to draw the icon. For MFC applications using the document/view model, // this is automatically done for you by the framework. void CFallDlg::OnPaint() { if (IsIconic()) { CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { CDialog::OnPaint(); } } // The system calls this to obtain the cursor to display while the user drags // the minimized window. HCURSOR CFallDlg::OnQueryDragIcon() { return (HCURSOR) m_hIcon; }
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