fireballtitle.java

用JAVA APPLET实现突现式连接 ／＊＊＊＊＊＊＊＊＊＊＊＊／

import java.applet.*;
import java.awt.*;
import java.net.MalformedURLException;
import java.net.URL;

public class fireballtitle extends Applet
    implements Runnable
{
    private int fontsize = 0;
    private int l = 0;
    private int dx = 0;
    private int col = 0;
    private int step = 0;
    private int sel = 0;
    private Thread program_thread = null;
    private Font font = null;
    private Image bufferscreen = null;
    private int sleeptime = 0;
    private Graphics g = null;
    private Graphics g2 = null;
    private int maxitems = 0;
    String items[] = null;
    String urls[] = null;
    private Color colors[] = null;
    private int colortable[] = null;
    private Dimension d = null;
    private double alpha = 0;
    private double beta = 0;
    private int charcount = 0;
    private int backgroundcolorint = 0;
    private int foregroundcolorint = 0;
    private Color backgroundcolor = null;
    private Color foregroundcolor = null;
    private String target = null;
    AppletContext appletcontrol = null;

    public void init()
    {
        super.init();
        setLayout(null);
        prepareVariables();
        alpha = 0.0D;
        beta = 0.0D;
        colortable = new int[100];
        colors = new Color[20];
        double bgRed = (backgroundcolorint & 0xff0000) >> 16;
        double bgGreen = (backgroundcolorint & 0xff00) >> 8;
        double bgBlue = backgroundcolorint & 0xff;
        double fgRed = (foregroundcolorint & 0xff0000) >> 16;
        double fgGreen = (foregroundcolorint & 0xff00) >> 8;
        double fgBlue = foregroundcolorint & 0xff;
        for(int i = 0; i < 20; i++)
        {
            double rangeRed = ((fgRed - bgRed) * (double)i) / 19D;
            double rangeGreen = ((fgGreen - bgGreen) * (double)i) / 19D;
            double rangeBlue = ((fgBlue - bgBlue) * (double)i) / 19D;
            int currentRed = (int)(bgRed + rangeRed);
            int currentGreen = (int)(bgGreen + rangeGreen);
            int currentBlue = (int)(bgBlue + rangeBlue);
            colors[i] = new Color(currentRed * 0x10000 + currentGreen * 256 + currentBlue + 0xff000000);
        }

        for(int j = 0; j < 40; j++)
            colortable[j] = 0;

    }

    public int stylecheck()
    {
        int i = 0;
        String s = getParameter("italic");
        s = s.toLowerCase();
        if(s.charAt(0) == 'y')
            i = 2;
        s = getParameter("bold");
        s = s.toLowerCase();
        if(s.charAt(0) == 'y')
            i++;
        return i;
    }

    int getParameter(String s1, int s2) {
        String s = getParameter(s1) ;
        return (s != null) ? Integer.parseInt(s) : s2 ;
    }

    Color getParameter(String s1, Color s2)
    {
        String s = getParameter(s1);
        return (s != null) ? new Color(Integer.parseInt(s, 16)) : s2 ;
    }
    
    public void prepareVariables()
    {
        fontsize = getParameter("fontsize", 24);
        sleeptime = getParameter("sleeptime", 50);
        step = getParameter("step", 5);
        resize(getSize().width, getSize().height);
        font = new Font("Courier", stylecheck(), fontsize);
        d = getSize();
        bufferscreen = createImage(d.width, d.height);
        appletcontrol = getAppletContext();
        g2 = getGraphics();
        g = bufferscreen.getGraphics();
        foregroundcolor = getParameter("foreground", Color.white);
        foregroundcolorint = foregroundcolor.getRGB();
        backgroundcolor = getParameter("background", Color.black);
        backgroundcolorint = backgroundcolor.getRGB();
        target = getParameter("target");
        String s = "";
        maxitems = 0;
        while(s != null) 
        {
            s = getParameter("item" + maxitems);
            if(s != null)
                maxitems++;
        }

        items = new String[maxitems];
        urls = new String[maxitems];
        for(int i = 0; i < maxitems; i++)
        {
            items[i] = getParameter("item" + i);
            urls[i] = getParameter("url" + i);
        }

    }

    public boolean mouseEnter(Event event, int i, int j)
    {
        Container container = getParent();
        for(boolean flag = false; container != null && !flag; container = container.getParent())
            if(container instanceof Frame)
            {
                ((Frame)container).setCursor(12);
                flag = true;
            }
        showStatus(urls[sel]);    
        return true;
    }

    public boolean mouseExit(Event event, int i, int j)
    {
        Container container = getParent();
        for(boolean flag = false; container != null && !flag; container = container.getParent())
            if(container instanceof Frame)
            {
                ((Frame)container).setCursor(0);
                flag = true;
            }
     showStatus("");
     return true;
    }

    public boolean mouseDown(Event event, int i, int j)
    {
        URL url;
        try
        {
            url = new URL(urls[sel]);
        }
        catch(MalformedURLException _ex)
        {
            showStatus("Invalid URL.");
            return true;
        }
        if(target != null)
        {
            if(target.length() > 0)
                appletcontrol.showDocument(url, target);
            else
                appletcontrol.showDocument(url);
        }
        else
        {
            appletcontrol.showDocument(url);
        }
        return true;
    }

    public void drawfireball(Graphics g1, int i, int j, int k, int currentGreen)
    {
        for(double bgRed = currentGreen; bgRed < 2D * Math.PI + (double)currentGreen;)
        {
            bgRed += (30D * Math.PI) / 180D;
            int i2 = 0;
            int j2 = 0;
            for(int currentBlue = 0; currentBlue < k / 4; currentBlue++)
            {
                int k1 = i2;
                int l1 = j2;
                double bgGreen = bgRed + Math.random() / 4D;
                i2 = (int)((double)(-currentBlue * 4) * Math.sin(bgGreen));
                j2 = (int)((double)(currentBlue * 4) * Math.cos(bgGreen));
                Color color = new Color((65280 * (k / 4 - currentBlue) * 4) / k + 0xff0000);
                g1.setColor(color);
                g1.drawLine(i + k1, j + l1, i + i2, j + j2);
            }

        }

    }

    public void start()
    {
        if(program_thread == null)
        {
            program_thread = new Thread(this);
            program_thread.start();
        }
    }

    public void stop()
    {
        if(program_thread != null && program_thread.isAlive())
            program_thread.stop();
        program_thread = null;
    }

    public void run()
    {
        g.setFont(font);
        FontMetrics fontmetrics = g.getFontMetrics(font);
        do
        {
            sel = 0;
            for(int i = 0; i < maxitems; i++)
            {
                sel = i;
                g.setColor(backgroundcolor);
                g.fillRect(0, 0, d.width, d.height);
                dx = d.width / 2 - fontmetrics.stringWidth(items[i]) / 2;
                for(int j = 0; j < d.width; j += step)
                {
                    g.setColor(backgroundcolor);
                    g.fillRect(0, 0, d.width, d.height);
                    for(int k = 0; k < items[i].length(); k++)
                    {
                        g.setColor(colors[19]);
                        g.drawString(items[i].substring(k, k + 1), dx + k * (fontsize / 2), fontsize);
                    }
                    g.setColor(backgroundcolor);
                    g.fillRect(j, 0, d.width, d.height);
                    drawfireball(g, j, d.height / 2 + 4, fontsize / 2, j / 100);
                    g2.drawImage(bufferscreen, 0, 0, this);
                    try
                    {
                        Thread.sleep(sleeptime / 20);
                    }
                    catch(InterruptedException _ex) { }
                }
                for(int i1 = 0; i1 < 40; i1++)
                {
                    g.setColor(backgroundcolor);
                    g.fillRect(0, 0, d.width, d.height);
                    dx = d.width / 2 - fontmetrics.stringWidth(items[i]) / 2;
                    for(int j1 = 0; j1 < items[i].length(); j1++)
                    {
                        if(j1 >= charcount)
                        {
                            charcount++;
                            colortable[j1] = 40;
                            for(int k1 = 0; k1 < j1 + 1; k1++)
                                if(--colortable[k1] < 0)
                                    colortable[k1] = 0;
                        }
                        if(colortable[j1] > 19)
                            col = 19;
                        else
                            col = colortable[j1];
                        g.setColor(colors[col]);
                        g.drawString(items[i].substring(j1, j1 + 1), dx + j1 * (fontsize / 2), fontsize);
                    }
                    for(int l1 = 0; l1 < items[i].length() + 1; l1++)
                        if(--colortable[l1] < 0)
                            colortable[l1] = 0;
                    g2.drawImage(bufferscreen, 0, 0, this);
                    try
                    {
                        Thread.sleep(sleeptime);
                    }
                        catch(InterruptedException _ex) { }
                    }

                charcount = 0;
            }

        }
        while(true);
    }
       
    public boolean handleEvent(Event event)
    {
        return super.handleEvent(event);
    }    
}