luminous.java

Java 范例实战 光盘使用说明 ========================== 本光盘的文件结构如下所示： =====================================

import java.applet.Applet;
import java.applet.AppletContext;
import java.awt.*;
import java.awt.image.MemoryImageSource;
import java.awt.image.PixelGrabber;
import java.io.PrintStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.StringTokenizer;
import java.util.Vector;

public class luminous extends Applet
    implements Runnable
{

    int w_width = 0;
    int w_height = 0;
    Image bgi = null;
    Image backimage = null;
    Image backi = null;
    Image textimage = null;
    Image tim = null;
    Graphics bgg = null;
    Graphics backig = null;
    Graphics tgg = null;
    Thread mythread = null;
    int delay = 0;
    int step = 0;
    Color bgcolor = null;
    Color textcolor = null;
    MediaTracker mt = null;
    Font font = null;
    FontMetrics fm = null;
    String text = null;
    boolean done = false;
    String fontname = null;
    int fontsize = 0;
    int fontstyle = 0;
    URL link = null;
    String target = null;
    int ntext = 0;
    PixelGrabber pgtext = null;
    PixelGrabber pgbg = null;
    int textpixels[] = null;
    int bgpixels[] = null;
    int pixx[] = null;
    int pixy[] = null;
    int maxstep = 0;
    final int BLAST = 0;
    final int FADE = 1;
    final int SPIN = 2;
    final int ROLL = 3;
    int mode = 0;
    int frommode = 0;
    int tomode = 0;

    public boolean mouseUp(Event event, int i, int j)
    {
    	
        if(link != null)
        {
        	
            getAppletContext().showDocument(link, target);
            return true;
        
        }
        else
        {
        
            return false;
        
        }
    
    }

    public boolean mouseEnter(Event event, int i, int j)
    {
    
        if(link != null)
            showStatus(link.toString());
        return true;
    
    }

    public boolean mouseExit(Event event, int i, int j)
    {
    
        if(link != null)
            showStatus("");
        return true;
        
    }
    
    int getParameter(String s1, int s2) 
    {
    
        String s = getParameter(s1) ;
        return (s != null) ? Integer.parseInt(s) : s2 ;
    
    }

    String getParameter(String s1, String s2) 
    {
   
        String s = getParameter(s1) ;
        return (s != null) ? s : s2 ;
   
    }
    
    Color getParameter(String s1, Color s2)
    {
   
        String s = getParameter(s1);
        return (s != null)?new Color(Integer.parseInt(s, 16)):s2 ;
   
    }
        
    public luminous()
    {
    	
        fontname = "TimesRoman";
        fontsize = 14;
        fontstyle = 1;
        target = "_self";
        maxstep = 10;
        mode = 1;
        frommode = 1;
        tomode = 1;
    
    }    
    
    public void init()
    {
    
        w_width = getSize().width;
        w_height = getSize().height;
        textcolor = new Color(0);
        bgi = createImage(w_width, w_height);
        bgg = bgi.getGraphics();
        backi = createImage(w_width, w_height);
        backig = backi.getGraphics();    
        delay = getParameter("DELAY",200);    
        bgcolor = getParameter("BGCOLOR",Color.white);
        String s = getParameter("BGIMAGE","");
        if(s != null)
        {
    
            backimage = getImage(getDocumentBase(), s);
            mt = new MediaTracker(this);
            mt.addImage(backimage, 0);
            mt.checkAll(true);
    
        }
        font = new Font(fontname, fontstyle, fontsize);
        bgg.setFont(font);
        fm = bgg.getFontMetrics();
        textimage = createImage(w_width, w_height);
        tgg = textimage.getGraphics();
        textpixels = new int[w_width * w_height];
        bgpixels = new int[w_width * w_height];
        nextText();
    
    }

    public void parsetag(String s)
    {
    
        s = s.trim();
        for(StringTokenizer stringtokenizer=new StringTokenizer(s);
            StringTokenizer.hasMoreTokens();)
        {
    
            String s1 = stringtokenizer.nextToken();
            if(s1.toLowerCase().startsWith("color="))
                try
                {
                	
                    textcolor = new Color(
                      Integer.parseInt(s1.substring(s1.indexOf("=")+
                      1, s1.length()), 16));
                    
                }
                catch(NumberFormatException _ex) { }
            if(s1.toLowerCase().startsWith("size"))
                try
                {
                	
                    fontsize = Integer.parseInt(
                       s1.substring(s1.indexOf("=") + 
                       1, s1.length()), 16);
                       
                }
                catch(NumberFormatException _ex) { }
            if(s1.toLowerCase().startsWith("style"))
                try
                {
                	
                    fontstyle = Integer.parseInt(
                       s1.substring(s1.indexOf("=") + 
                       1, s1.length()), 16);
                
                }
                catch(NumberFormatException _ex) { }
            if(s1.toLowerCase().startsWith("font"))
                fontname = s1.substring(s1.indexOf("=") + 
                1, s1.length());
            if(s1.toLowerCase().startsWith("link"))
            {
            	
                String s2 = s1.substring(s1.indexOf("=") + 
                1, s1.length());
                if(s2.equalsIgnoreCase("null"))
                    link = null;
                else
                    try
                    {
                    	
                        link = new URL(getDocumentBase(), s2);
                    
                    }
                    catch(MalformedURLException _ex) { }
                    
            }
            if(s1.toLowerCase().startsWith("target"))
                target = s1.substring(s1.indexOf("=") + 
                1, s1.length());
            if(s1.toLowerCase().startsWith("start"))
            {
                
                String s3 = s1.substring(s1.indexOf("=") + 
                            1, s1.length()).toUpperCase().trim();
                frommode = 0;
                if(s3.equals("FADE"))
                    frommode = 1;
                if(s3.equals("SPIN"))
                    frommode = 2;
                if(s3.equals("ROLL"))
                    frommode = 3;
                    
            }
            if(s1.toLowerCase().startsWith("end"))
            {
                
                String s4 = s1.substring(s1.indexOf("=") + 
                            1, s1.length()).toUpperCase().trim();
                tomode = 0;
                if(s4.equals("FADE"))
                    tomode = 1;
                if(s4.equals("SPIN"))
                    tomode = 2;
                if(s4.equals("ROLL"))
                    tomode = 3;
                    
            }
            
        }

    }

    public String parsetext(String s)
    {
    	
        for(s = s.trim(); 
            s.startsWith("|") && s.indexOf("|", 1) != -1;)
        {
        
            String s1 = s.substring(1, s.indexOf("|", 1));
            parsetag(s1);
            if(s.indexOf("|", 1) + 1 < s.length())
                s = s.substring(s.indexOf("|", 1) + 1, s.length());
            else
                s = "";
                
        }

        font = new Font(fontname, fontstyle, fontsize);
        bgg.setFont(font);
        if((fontstyle & 0x2) != 0)
            fm = bgg.getFontMetrics(
            new Font(fontname, fontstyle & 0xfffffffd, fontsize));
        else
            fm = bgg.getFontMetrics();
        return s.trim();
        
    }

    public void nextText()
    {
    	
        text = getParameter("TEXT" + ntext,"END OF DATA");
        if(text == "END OF DATA")