javademo.java

有关java的源程序,为讲授java程序设计课程使用

//******************************************************************************
// JavaDemo.java:	Applet
//
//******************************************************************************
import java.applet.*;
import java.awt.*;
import JavaDemoFrame;
import IDD_STOPDIALOG;

//==============================================================================
// Main Class for applet JavaDemo
//
//==============================================================================
public class JavaDemo extends Applet implements Runnable
{
	// THREAD SUPPORT:
	//		m_JavaDemo	is the Thread object for the applet
	//--------------------------------------------------------------------------
	private Thread	 m_JavaDemo1 = null;
	private Thread	 m_JavaDemo2 = null;
    private Thread	 m_JavaDemo3 = null;
	private Thread	 m_JavaDemo4 = null;

	// ANIMATION SUPPORT:
	//		m_Graphics		used for storing the applet's Graphics context
	//		m_Images[]		the array of Image objects for the animation
	//		m_nCurrImage	the index of the next image to be displayed
	//		m_ImgWidth		width of each image
	//		m_ImgHeight		height of each image
	//		m_fAllLoaded	indicates whether all images have been loaded
	//		NUM_IMAGES 		number of images used in the animation
	//--------------------------------------------------------------------------
	private Graphics m_Graphics;
	public static Image m_Images[];
	private int 	 m_nCurrImage;
	private int 	 m_nImgWidth  = 0;
	private int 	 m_nImgHeight = 0;
	private boolean  m_fAllLoaded = false;
	private final int NUM_IMAGES = 18;

	// STANDALONE APPLICATION SUPPORT:
	//		m_fStandAlone will be set to true if applet is run standalone
	//--------------------------------------------------------------------------
	private boolean m_fStandAlone = false;

	// STANDALONE APPLICATION SUPPORT
	// 	The main() method acts as the applet's entry point when it is run
	// as a standalone application. It is ignored if the applet is run from
	// within an HTML page.
	//--------------------------------------------------------------------------

	// This Is My member Datas

	private boolean stopFlag=true;
	private IDD_STOPDIALOG stopDialog;
    public static Color appletBackGround;	
	public static int frameRed;
	public static int frameGreen;
	public static int frameBlue;

	public static void main(String args[])
	{
		// Create Toplevel Window to contain applet JavaDemo
		//----------------------------------------------------------------------
		JavaDemoFrame frame = new JavaDemoFrame("This Is Yang Main Frame Window");

		// Must show Frame before we size it so insets() will return valid values
		//----------------------------------------------------------------------
		frame.show();
        frame.hide();

		int screenWidth=Toolkit.getDefaultToolkit().getScreenSize().width;
		int screenHeight=Toolkit.getDefaultToolkit().getScreenSize().height;
		frame.resize(frame.insets().left + frame.insets().right  + screenWidth/2,
					 frame.insets().top  + frame.insets().bottom + screenHeight/2);

		// The following code starts the applet running within the frame window.
		// It also calls GetParameters() to retrieve parameter values from the
		// command line, and sets m_fStandAlone to true to prevent init() from
		// trying to get them from the HTML page.
		//----------------------------------------------------------------------
		JavaDemo applet_JavaDemo = new JavaDemo();
		applet_JavaDemo.m_fStandAlone = true;
		frame.add("Center", applet_JavaDemo);
		applet_JavaDemo.init();
		applet_JavaDemo.start();

		frame.locate(screenWidth/2,screenHeight/2);		
        frame.show();
	}

	// JavaDemo Class Constructor
	//--------------------------------------------------------------------------
	public JavaDemo()
	{
	// TODO: Add constructor code here
	}

	// APPLET INFO SUPPORT:
	//		The getAppletInfo() method returns a string describing the applet's
	// author, copyright date, or miscellaneous information.
    //--------------------------------------------------------------------------
	public String getAppletInfo()
	{
		return "Name: JavaDemo\r\n" +
		       "Author: wang\r\n" +
		       "Created with Microsoft Visual J++ Version 1.1";
	}


	// The init() method is called by the AWT when an applet is first loaded or
	// reloaded.  Override this method to perform whatever initialization your
	// applet needs, such as initializing data structures, loading images or
	// fonts, creating frame windows, setting the layout manager, or adding UI
	// components.
    //--------------------------------------------------------------------------
	public void init()
	{
        // If you use a ResourceWizard-generated "control creator" class to
        // arrange controls in your applet, you may want to call its
        // CreateControls() method from within this method. Remove the following
        // call to resize() before adding the call to CreateControls();
        // CreateControls() does its own resizing.
        //----------------------------------------------------------------------
    	//resize(320, 240);
		
		// TODO: Place additional initialization code here
		if(m_fStandAlone)
			return;
		

		String backGroundString=getParameter("BackGroundColor");
		if(backGroundString!=null)
		{
			try
			{
				switch(Integer.parseInt(backGroundString))
				{ 
// Color value :
// black=0,blue=1,cyan=2,darkGray=3,gray=4,green=5,lightGray=6,magenta=7
// orange=8 pink=9,red=10,white=11,yellow=12
				    case 0:
						JavaDemo.appletBackGround=Color.black;
						break;
					case 1:
						JavaDemo.appletBackGround=Color.blue;
						break;
					case 2:
						JavaDemo.appletBackGround=Color.cyan;
						break;
					case 3:
						JavaDemo.appletBackGround=Color.darkGray;
						break;
					case 4:
						JavaDemo.appletBackGround=Color.gray;
						break;
					case 5:
						JavaDemo.appletBackGround=Color.green;
						break;
					case 6:
						JavaDemo.appletBackGround=Color.lightGray;
						break;
					case 7:
						JavaDemo.appletBackGround=Color.magenta;
						break;
					case 8:
						JavaDemo.appletBackGround=Color.orange;
						break;
					case 9:
						JavaDemo.appletBackGround=Color.pink;
						break;
					case 10:
						JavaDemo.appletBackGround=Color.red;
						break;
					case 11:
						JavaDemo.appletBackGround=Color.white;
						break;
					case 12:
						JavaDemo.appletBackGround=Color.yellow;
						break;
					default:
						JavaDemo.appletBackGround=Color.green;
						break;
				}
			}
			catch(NumberFormatException e)
			{
				 appletBackGround=Color.green;
			}
			
				
		}
		setBackground(appletBackGround);

		stopDialog=new IDD_STOPDIALOG(this);
		stopDialog.CreateControls();
		stopDialog.IDCSTOP.setFont(new Font("Times",Font.PLAIN,14));

		setFont(new Font("Helvetica",Font.ITALIC,14));
	}

	// Place additional applet clean up code here.  destroy() is called when
	// when you applet is terminating and being unloaded.
	//-------------------------------------------------------------------------
	public void destory()
	{
		// TODO: Place applet cleanup code here
	}

    // ANIMATION SUPPORT:
    //		Draws the next image, if all images are currently loaded
    //--------------------------------------------------------------------------
	private void displayImage(Graphics g)
	{
		if (!m_fAllLoaded)
			return;

		// Draw Image in center of applet
		//----------------------------------------------------------------------
		g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)/3,
		                   (size().height -2*m_nImgHeight)/3, null);
		g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)*2/3+m_nImgWidth,
		                   (size().height -2*m_nImgHeight)/3, null);
		g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)/3,
		                   (size().height -2*m_nImgHeight)*2/3+m_nImgHeight, null);
        g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)*2/3+m_nImgWidth,
		                   (size().height -2*m_nImgHeight)*2/3+m_nImgHeight, null);

		if(Thread.currentThread()==m_JavaDemo1)
		        g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)/3,
		                   (size().height -2*m_nImgHeight)/3, null);

		else if(Thread.currentThread()==m_JavaDemo2) 
		    	g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)*2/3+m_nImgWidth,
		                   (size().height -2*m_nImgHeight)/3, null);

		else if(Thread.currentThread()==m_JavaDemo3) 
		        g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)/3,
		                   (size().height -2*m_nImgHeight)*2/3+m_nImgHeight, null);

		else if(Thread.currentThread()==m_JavaDemo4) 
		        g.drawImage(JavaDemo.m_Images[m_nCurrImage],
		                   (size().width - 2*m_nImgWidth)*2/3+m_nImgWidth,
		                   (size().height -2*m_nImgHeight)*2/3+m_nImgHeight, null);
	}

	// JavaDemo Paint Handler
	//--------------------------------------------------------------------------
	public void paint(Graphics g)
	{
		// ANIMATION SUPPORT:
		//		The following code displays a status message until all the
		// images are loaded. Then it calls displayImage to display the current
		// image.
		//----------------------------------------------------------------------
		int stringX;
		String displayString;

		Dimension rectSize=size();
		FontMetrics fm=getFontMetrics(getFont());
		if (m_fAllLoaded)
		{
		//	Rectangle r = g.getClipRect();
		//	g.clearRect(r.x, r.y, r.width, r.height);

			displayImage(g);
//This is My Statement inserted
	        if(m_fStandAlone)
			{
				displayString="Hello World ! This Is Yang's Application";
			}
			else
			{
				displayString=getParameter("AppletString");
				if(displayString==null)