//RGB.java
//Demonstrates RGB Color model
//Andy Harris, 05/00

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class RGB extends Applet implements AdjustmentListener{

  Label lblOutput = new Label();
  Panel pnlRGB = new Panel();
  
  Panel pnlRed = new Panel();
  Scrollbar scrRed = new Scrollbar (Scrollbar.VERTICAL, 0, 1, 0, 256);
  Label lblRed = new Label("0");

  Panel pnlGreen = new Panel();
  Scrollbar scrGreen = new Scrollbar (Scrollbar.VERTICAL, 0, 1, 0, 256);
  Label lblGreen = new Label("0");

  Panel pnlBlue = new Panel();
  Scrollbar scrBlue = new Scrollbar (Scrollbar.VERTICAL, 0, 1, 0, 256);
  Label lblBlue = new Label("0");

  public void init(){
    setLayout(new BorderLayout());
    add(pnlRGB, BorderLayout.WEST);
    add(lblOutput, BorderLayout.CENTER);

    pnlRGB.setLayout(new GridLayout(1,0));
    pnlRGB.add(pnlRed);
    pnlRGB.add(pnlGreen);
    pnlRGB.add(pnlBlue);
    
    pnlRed.setLayout(new BorderLayout());
    pnlRed.add(new Label("R"), BorderLayout.NORTH);
    pnlRed.add(scrRed, BorderLayout.CENTER);
    pnlRed.add(lblRed, BorderLayout.SOUTH);

    pnlGreen.setLayout(new BorderLayout());
    pnlGreen.add(new Label("G"), BorderLayout.NORTH);
    pnlGreen.add(scrGreen, BorderLayout.CENTER);
    pnlGreen.add(lblGreen, BorderLayout.SOUTH);

    pnlBlue.setLayout(new BorderLayout());
    pnlBlue.add(new Label("B"), BorderLayout.NORTH);
    pnlBlue.add(scrBlue, BorderLayout.CENTER);
    pnlBlue.add(lblBlue, BorderLayout.SOUTH);

    //add listeners
    scrRed.addAdjustmentListener(this);
    scrGreen.addAdjustmentListener(this);
    scrBlue.addAdjustmentListener(this);
    
  } // end init

  public void adjustmentValueChanged(AdjustmentEvent e){
    int red = scrRed.getValue();
    int green = scrGreen.getValue();
    int blue = scrBlue.getValue();

    lblRed.setText(String.valueOf(red));
    lblGreen.setText(String.valueOf(green));
    lblBlue.setText(String.valueOf(blue));
    
    Color theColor = new Color (red, green, blue);
    lblOutput.setBackground(theColor);
  } // end adjValChanged

} // end class def