RGB mixser on JAVA

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

class Slider
{ 
 public boolean over, drag, down;
 private Rectangle r=new Rectangle();
 private Graphics g; 
 public Color color;
 public int x, y, y1, y2, pos, pos_old, height, value; 
 
 public Slider(int x, int y, Color color)
 {  
  height=104; 
  this.x=x;
  this.y=y;    
  pos=y+height/2;
  this.color=color;
  r.x=x-10;
  r.y=pos-5;
  r.width=22;
  r.height=10;
 }
 
 public void reportMouseMove(int x, int y)
 {
  if(r.inside(x,y))
   over=true;
  else
   over=false;  
 }
 
 public void reportMouseDown(int x, int y)
 {
  if(r.inside(x,y))
  {
   down=true;
   y1=y;
   pos_old=pos;
  } 
 }

 public void reportMouseUp(int x, int y)
 {  
  down=false;
 }

 public void reportMouseDrag(int x, int y)
 {
  if(down)
  {
   drag=true; 
   y2=y-y1;

   pos=y2+pos_old;

   if(pos<this.y+2)pos=this.y+2;
   if(pos>this.y+height)pos=this.y+height;
   r.move(r.x,pos-5);
  }
  else
   drag=false;
 }
 
 private void drawSlider()
 {
  //the slot
  g.setColor(Color.darkGray);
  g.drawLine(x,y,x,y+height);
  g.setColor(Color.gray);  
  g.drawLine(x-1,y,x-1,y+height);
  g.setColor(Color.lightGray.brighter());
  g.drawLine(x+1,y,x+1,y+height);

  //draw the scale  
  g.setColor(Color.gray);
  for(int i=y+1; i<y+104; i++)
  {
   if(i%2==0)
   {
    g.drawLine(x-10,i,x-5,i);
    g.drawLine(x+10,i,x+5,i);
   }
  }

  //the slider knob
  g.setColor(Color.lightGray);
  g.fill3DRect(x-10,pos-6,22,12,true);
  g.fill3DRect(x-9,pos-5,20,10,true);  

  g.setColor(color);
  g.fillRect(x-8,pos-1,18,2);
  
  //the value
  value=255-(((pos-y-2)/2)*5);
  String valuestring=""+value;

  //measure the size of the string to center it
  Font font=new Font("Helvetica", Font.PLAIN, 12);
        FontMetrics fm = g.getFontMetrics(font);
        int stringWidth=fm.stringWidth(valuestring);        
        
        g.setFont(font);
  g.setColor(Color.black);
  g.drawString(valuestring, x-stringWidth/2, y-10);  
 }
 
 public void paint(Graphics gr) 
 {   
  g=gr;
  drawSlider();
    }  

 public int getVal()
 {
  return value;
 }
}

public class RGBMixer extends Applet 
{   
        Image Buffer;
        Graphics gBuffer;
  URL url;   
  int h=35;
  Slider sl1=new Slider(180,h,Color.red);
  Slider sl2=new Slider(210,h,Color.green);
  Slider sl3=new Slider(240,h,Color.blue);
  //the hotlink
  Rectangle r=new Rectangle(165,150,87,10); 
  boolean overLink;
 
        public void update(Graphics g)
  {
            paint(g);
        }

        public void init() 
  {   
            Buffer=createImage(size().width,size().height);
            gBuffer=Buffer.getGraphics();       

   try{url=new URL("http://www.programming.de/");}
   catch(MalformedURLException mal){}
        }

  public void drawStuff() { 
   
   gBuffer.setColor(Color.lightGray);
            gBuffer.fillRect(0,0,size().width,size().height);

   gBuffer.draw3DRect(0,0,size().width-1,size().height-1,true);
            gBuffer.draw3DRect(4,4,size().width-9,size().height-9,false);
   gBuffer.draw3DRect(5,5,size().width-11,size().height-11,true);

   gBuffer.draw3DRect(18,38,133,98,false);

   sl1.paint(gBuffer);
   sl2.paint(gBuffer);
   sl3.paint(gBuffer);   

   Color mixColor=
    new Color(sl1.getVal(),sl2.getVal(),sl3.getVal());

   gBuffer.setColor(mixColor);
            gBuffer.fillRect(20,40,130,95);

   String red,green,blue;

   red=sl1.getVal()<20?"0"+Integer.toHexString(sl1.getVal()):Integer.toHexString(sl1.getVal());
   green=sl2.getVal()<20?"0"+Integer.toHexString(sl2.getVal()):Integer.toHexString(sl2.getVal());
   blue=sl3.getVal()<20?"0"+Integer.toHexString(sl3.getVal()):Integer.toHexString(sl3.getVal());
   
   String hex="color=\"#"+red+green+blue+"\"";

   Font font=new Font("Helvetica", Font.PLAIN, 12);
   gBuffer.setFont(font);
   gBuffer.setColor(Color.black);
   gBuffer.drawString(hex,45,25); 

   Font smallFont=new Font("Helvetica", Font.PLAIN, 9);   
   gBuffer.setFont(smallFont);
   gBuffer.setColor(Color.gray);
   gBuffer.drawString("©2001 by Johannes Wallroth",20,157); 
   gBuffer.setColor(Color.blue);
   gBuffer.drawString("www.programming.de",165,157); 
   gBuffer.drawLine(165,158,251,158);    
  }

  public boolean mouseMove(Event evt,int x,int y)
  {   
   sl1.reportMouseMove(x, y);
   sl2.reportMouseMove(x, y);
   sl3.reportMouseMove(x, y);

   if(r.inside(x,y))
    overLink=true;
   else
    overLink=false;  

   Component ParentComponent = getParent();
   while ( ParentComponent != null && 
   !(ParentComponent instanceof Frame))         
   ParentComponent = ParentComponent.getParent();  
   Frame BrowserFrame = (Frame) ParentComponent;
   
   if(overLink)
    BrowserFrame.setCursor(Frame.HAND_CURSOR); 
   else
    BrowserFrame.setCursor(Frame.DEFAULT_CURSOR); 

   repaint();  
   return true;
  }

  public boolean mouseDrag(Event evt,int x,int y)
  {
   sl1.reportMouseDrag(x, y);
   sl2.reportMouseDrag(x, y);
   sl3.reportMouseDrag(x, y);
   repaint();
   return true;
  }  

  public boolean mouseDown(Event evt,int x,int y)
  {
   sl1.reportMouseDown(x, y);
   sl2.reportMouseDown(x, y);
   sl3.reportMouseDown(x, y);   

   if(overLink)
    getAppletContext().showDocument(url,"_blank");   

   repaint();
   return true;
  }

  public boolean mouseUp(Event evt,int x,int y)
  {
   sl1.reportMouseUp(x, y);   
   sl2.reportMouseUp(x, y);   
   sl3.reportMouseUp(x, y);   
   repaint();
   return true;
  }
  
        public void paint(Graphics g) 
  {
    drawStuff();
    g.drawImage (Buffer,0,0, this);                                
        }
} 

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