//**************************************
//     
// Name: Color Cycle Picture
// Description:Cycles different colors b
//     ehind any text logo and scrolls a messag
//     e at the same time.
// By: 
//**************************************
//     

import java.applet.*; 
import java.awt.*; 
public class Colorcycle extends Applet implements Runnable 
    { 
    private Thread m_Colorcycle = null; 
    private Color linee[]; 
    private Image dbufferimage; 
    private Graphics dbuffer; 
    String scrolltext; 
    int scrolltextpos = 0; 
    int maxpos = 0; 
    int rcol = 0; 
    int gcol = 0; 
    int bcol = 0; 
    int linefactor = 4; 
    Image logopicture; 
    boolean pleasewait = true; 
    boolean rcol_add = true; 
    boolean bcol_add = false; 
    boolean gcol_add = false; 
    boolean growing = true; 
    public void init() 
        { 
        String parm; 
        linee = new Color[size().height/linefactor]; 
        // Loads picture 
        MediaTracker tracker = new MediaTracker(this); 
        logopicture = getImage(getDocumentBase(), getParameter("logo")); 
        parm = getParameter("scroll"); 
        if ( parm !=null) 
        scrolltext = parm; 
        else 
        scrolltext = ""; 
        parm = getParameter("factor"); 
        if ( parm !=null) 
        linefactor = Integer.parseInt(parm);; 
        tracker.addImage(logopicture, 0); 
        try 
            { 
            tracker.waitForID(0); 
        } 

        catch(Exception e) {}; 
        for(maxpos = 0; maxpos<(size().height/linefactor)-1 ; maxpos++) 
            { 
            linee[maxpos]=new Color(0,0,0); 
        } 

        maxpos = size().height; 
        dbufferimage = createImage(size().width,size().height); 
        scrolltextpos = size().width + 20; 
        dbuffer = dbufferimage.getGraphics(); 
        dbuffer.setFont(new Font("Arial",Font.BOLD,24)); 
    } 

    public void update(Graphics g) 
        { 
        if (logopicture == null) 
        return; 
        pleasewait = true; 
        for(maxpos = 1; maxpos < (size().height/linefactor)-1 ; maxpos++) 
            { 
            linee[maxpos-1]=linee[maxpos]; 
            dbuffer.setColor(linee[maxpos]); 
            dbuffer.fillRect(0,(maxpos-1)*linefactor,size().width,((maxpos-1)*linefactor)+linefactor); 
        } 

        createcolorFade(); 
        linee[maxpos-1]=new Color(rcol,gcol,bcol); 
        dbuffer.drawImage(logopicture,0,0,this); 
        scrolltextpos -=2; 
        dbuffer.setColor(new Color(rcol,gcol,bcol)); 
        dbuffer.drawString(scrolltext,scrolltextpos,size().height-15); 
        pleasewait = false; 
        if (scrolltextpos * -1 > scrolltext.length()*12) 
        scrolltextpos =size().width + 30; 
        paint(g); 
    } 

    public void paint(Graphics g) 
        { 
        if(!pleasewait) 
            { 
            if (dbufferimage!= null) 
                { 
                g.drawImage(dbufferimage, 0, 0, null); 
            } 

        } 

    } 

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

    } 

    public void stop() 
        { 
        if (m_Colorcycle != null) 
            { 
            m_Colorcycle.stop(); 
            m_Colorcycle = null; 
        } 

    } 

    public void run() 
        { 
        while (true) 
            { 
            try 
                { 
                repaint(); 
                Thread.sleep(50); 
            } 

            catch (InterruptedException e) 
                { 
                stop(); 
            } 

        } 

    } 

    public void createcolorFade() 
        { 
        if( growing) 
            { 
            if( rcol_add == true ) 
                { 
                rcol += 15; 
                if ( rcol == 255) 
                    { 
                    rcol_add = false; 
                    gcol_add = true; 
                } 

            } 

            if( gcol_add == true ) 
                { 
                gcol += 15; 
                if ( gcol == 255) 
                    { 
                    gcol_add = false; 
                    bcol_add = true; 
                } 

            } 

            if( bcol_add == true ) 
                { 
                bcol += 15; 
                if ( bcol == 255) 
                    { 
                    bcol_add = false; 
                    gcol_add = true; 
                    growing = false; 
                } 

            } 

        } 

        else 
            { 
            if( gcol_add == true ) 
                { 
                gcol -= 15; 
                if ( gcol == 0) 
                    { 
                    gcol_add = false; 
                    rcol_add = true; 
                } 

            } 

            if( rcol_add == true ) 
                { 
                rcol -= 15; 
                if ( rcol == 0) 
                    { 
                    rcol_add = false; 
                    bcol_add = true; 
                } 

            } 

            if( bcol_add == true ) 
                { 
                bcol -= 15; 
                if ( bcol == 0) 
                    { 
                    bcol_add = false; 
                    rcol_add = true; 
                    growing = true; 
                } 

            } 

        } 

    } 

}