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

public class ColorApplet extends Applet {

  GridBagLayout bag = new GridBagLayout();
  GridBagConstraints c = new GridBagConstraints();

  Scrollbar red;
  Scrollbar green;
  Scrollbar blue;

  Button svart;
  Button bla;
  Button vit;
  Button gron;
  Button gul;

  Button cyan;
  Button magenta;
  Button orange;
  Button rod;
  Button gray;
  
  Point bagPoint;
  TextField rgb;
  TextField rgb10;
  Color currentColor;
  Panel colorPanel;
  Label redLabel = new Label("R");
  Label greenLabel = new Label("G");
  Label blueLabel = new Label("B");
  Label rgbLabel = new Label("RGB(hex)");
  Label rgb10Label = new Label("RGB(10)");

  public void init(){
    
    bagPoint = bag.location(0,0);
    setLayout(bag);
    resize(300,250);
    red   = new Scrollbar(Scrollbar.HORIZONTAL, 0xEE, 1, 0, 255);
    green = new Scrollbar(Scrollbar.HORIZONTAL, 0xDD, 1, 0, 255);
    blue  = new Scrollbar(Scrollbar.HORIZONTAL, 0x82, 1, 0, 255);

    rgb   = new TextField(7);
    rgb10 = new TextField(9);

    colorPanel = new Panel();
    
    svart = new Button("Black");
    vit = new Button("White");
    gron = new Button("Green");
    bla = new Button("Blue");
    gul = new Button("Yellow");

    cyan = new Button("Cyan");
    magenta = new Button("Magenta");
    orange = new Button("Orange");
    rod = new Button("Red");
    gray = new Button("Gray");
    
    currentColor = new Color(0,0,0);
    c.anchor = GridBagConstraints.WEST;
    c.gridx = 0;
    c.gridy = 0;
    c.gridwidth = 4;
    c.fill = GridBagConstraints.HORIZONTAL;
    bag.setConstraints(red, c);
    add(red);
    
    c.gridwidth = 1;
    c.gridx = 4;
    c.gridy = 0;
    c.anchor = GridBagConstraints.NORTHWEST;
    c.fill = GridBagConstraints.VERTICAL;
    bag.setConstraints(redLabel, c);
    add(redLabel);

    c.anchor = GridBagConstraints.WEST;
    c.gridx = 0;
    c.gridy = 1;
    c.gridwidth = 4;
    c.fill = GridBagConstraints.HORIZONTAL;
    bag.setConstraints(green, c);
    add(green);

    c.gridwidth = 1;
    c.gridx = 4;
    c.gridy = 1;
    c.anchor = GridBagConstraints.NORTHWEST;
    c.fill = GridBagConstraints.VERTICAL;
    bag.setConstraints(greenLabel, c);
    add(greenLabel);
    
    c.anchor = GridBagConstraints.WEST;
    c.gridx = 0;
    c.gridy = 2;
    c.gridwidth = 4;
    c.fill = GridBagConstraints.HORIZONTAL;
    bag.setConstraints(blue, c);
    add(blue);
    
    c.gridwidth = 1;
    c.gridx = 4;
    c.gridy = 2;
    c.anchor = GridBagConstraints.NORTHWEST;
    c.fill = GridBagConstraints.VERTICAL;
    bag.setConstraints(blueLabel, c);
    add(blueLabel);

    c.gridwidth = 1;
    c.gridx = 1;
    c.gridy = 3;
    c.fill = GridBagConstraints.NONE;
    bag.setConstraints(rgb, c);
    add(rgb);

    c.gridwidth=1;
    c.gridx = 0;
    c.gridy = 3;
    c.anchor = GridBagConstraints.NORTHEAST;
    bag.setConstraints(rgbLabel, c);
    add(rgbLabel);

    c.anchor = GridBagConstraints.NORTHWEST;
    c.gridwidth = 2;
    c.gridx = 3;
    c.gridy = 3;
    bag.setConstraints(rgb10, c);
    add(rgb10);

    c.anchor = GridBagConstraints.NORTHEAST;
    c.gridwidth=1;
    c.gridx = 2;
    c.gridy = 3;
    bag.setConstraints(rgb10Label, c);
    add(rgb10Label);

    c.anchor = GridBagConstraints.NORTHWEST;
    c.fill = GridBagConstraints.BOTH;
    c.gridwidth = 5;
    c.gridx = 0;
    c.gridy = 4;
    c.ipady = 50;
    bag.setConstraints(colorPanel, c);
    add(colorPanel);

    c.fill = GridBagConstraints.HORIZONTAL;
    c.ipadx = 1;
    c.ipady = 1;
    c.gridwidth = 1;
    c.gridx = 0;
    c.gridy = 5;
    c.insets = new Insets(2, 2 , 2 , 2);
    bag.setConstraints(svart, c);
    add(svart);

    c.gridx = 1;
    c.gridy = 5;
    bag.setConstraints(bla, c);
    add(bla);

    c.gridx = 2;
    c.gridy = 5;
    bag.setConstraints(vit, c);
    add(vit);

    c.gridx = 3;
    c.gridy = 5;
    bag.setConstraints(gul, c);
    add(gul);

    c.gridx = 4;
    c.gridy = 5;
    bag.setConstraints(gron, c);
    add(gron);

    c.gridx = 0;
    c.gridy = 6;
    bag.setConstraints(cyan, c);
    add(cyan);

    c.gridx = 1;
    c.gridy = 6;
    bag.setConstraints(magenta, c);
    add(magenta);

    c.gridx = 2;
    c.gridy = 6;
    bag.setConstraints(orange, c);
    add(orange);

    c.gridx = 3;
    c.gridy = 6;
    bag.setConstraints(rod, c);
    add(rod);

    c.gridx = 4;
    c.gridy = 6;
    bag.setConstraints(gray, c);
    add(gray);
  }

  private String to3digitString( int i ) 
  {
    return (i<100?"0":"")+(i<10?"0":"")+i;
  }


  private String rgbDeciString()
  {
    return to3digitString( red.getValue() )
      +to3digitString( green.getValue() )
      +to3digitString( blue.getValue() );
  }


  private void setColor( int r, int g, int b )
  {
    red.setValue( r );
    green.setValue( g );
    blue.setValue( b );
    repaint();
  }


  public void paint(Graphics g){
    rgb10.setText( rgbDeciString() );
    rgb.setText("#" + calculateHex(red.getValue())
		+ calculateHex(green.getValue())
		+ calculateHex(blue.getValue())    );
    currentColor = new Color(red.getValue(), green.getValue(), blue.getValue());
    Graphics panelGraphics = colorPanel.getGraphics();
    panelGraphics.setColor(currentColor);
    panelGraphics.fillRect(0,0,350,100);
    colorPanel.paint(panelGraphics);
  }


  private String calculateHex(int x){
    int sextontal;
    int ental;
    sextontal = x / 16;
    ental = x % 16;
    return makeHex(sextontal) + makeHex(ental);
  }


  private String makeHex(int tiobas){
    if(tiobas == 10){
      return "A";
    }
    if(tiobas == 11){
      return "B";
    }
    if(tiobas == 12){
      return "C";
    }
    if(tiobas == 13){
      return "D";
    }
    if(tiobas == 14){
      return "E";
    }
    if(tiobas == 15){
      return "F";
    }
    else return Integer.toString(tiobas);
  }
  

  public boolean handleEvent(Event e){
    if(e.target instanceof Scrollbar){
      repaint();
    }
    return super.handleEvent(e);
  }


  public boolean action(Event e, Object what) {
    if(e.target instanceof Button){
      Button b = (Button)e.target;
      if(b == svart) {
	setColor( 0, 0, 0 );
	return true;
      }
      if(b == bla) {
	setColor( 0, 0, 255 );
	return true;
      }
      if(b == gron) {
	setColor( 0, 255, 0 );
	return true;
      }
      if(b == gul) {
	setColor( 255, 255, 0 );
	return true;
      }
      if(b == vit) {
	setColor( 255, 255, 255 );
	return true;
      }
      if(b == cyan) {
	setColor( 0, 255, 255 );
	return true;
      }
      if(b == magenta) {
	setColor( 255, 0, 255 );
	return true;
      }
      if(b == rod) {
	setColor( 255, 0, 0 );
	return true;
      }
      if(b == gray) {
	setColor( 127, 127, 127 );
	return true;
      }
      if(b == orange) {
	setColor( 255, 180, 0 );
	return true;
      }      
    } else if (e.target instanceof TextField) {
      if ((TextField)e.target == rgb) {
	String s = (String)what;
	if (s.length()!=7 || s.charAt(0)!='#') {
	  repaint();
	  return true;
	} else {
	  s = s.substring(1,7);
	  try {
	    setColor(
		     Integer.parseInt(s.substring(0,2),16),
		     Integer.parseInt(s.substring(2,4),16),
		     Integer.parseInt(s.substring(4,6),16)
		     );
	  } catch (NumberFormatException err) {
	    System.err.println(err);
	    repaint();
	    return true;
	  }
	}
      } else if ((TextField)e.target == rgb10) {
	String s = (String)what;
	if (s.length()!=9) {
	  repaint();
	  return true;
	} else {
	  try {
	    setColor(
		     Integer.parseInt(s.substring(0,3)),
		     Integer.parseInt(s.substring(3,6)),
		     Integer.parseInt(s.substring(6,9))
		     );
	  } catch (NumberFormatException err) {
	    System.err.println(err);
	    repaint();
	    return true;
	  }
	}
      }
    }
    return super.action(e,what);
  }

  public void start(){

  }
  

}