/**
 * ColorMixer is a simple applet to help
 * pick a color in Java, showing the various arguments
 * needed to make a new Color.  The Color constructors
 * are a good example of overloading.  You can make a new
 * instance of Color by using one of several constructor methods.
 * One takes 3 integers (the Red-Green-Blue from 0 to 255)
 * another takes 3 float values (percentage from 0.0 to 1.0)
 * another takes a single hex value, and 
 * yet another takes a single intger value
 * 
 * @author Fr Chris Thiel, ofmCap
 * @date 9 September 2006
 * @version 1.0
 */
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
public class ColorMixer extends Applet implements  AdjustmentListener 
{
    int redValue = 0; // red
    int greenValue = 0; // green
    int blueValue = 0; // blue
    Label redLabel = new Label("Red=0");
    Label greenLabel = new Label("Green=000");
    Label blueLabel = new Label("Blue=000   ");
    
    
    Scrollbar red=new Scrollbar(Scrollbar.HORIZONTAL,0,20,0,275);
    Scrollbar green=new Scrollbar(Scrollbar.HORIZONTAL,0,20,0,275);
    Scrollbar blue=new Scrollbar(Scrollbar.HORIZONTAL,0,20,0,275);
    public void init() {
        /**
        * The next few lines sets up the layout to organize
        * all elements of the GUI (Graphic User Interface)
        */
        redLabel.setAlignment(Label.RIGHT);
        greenLabel.setAlignment(Label.RIGHT);
        blueLabel.setAlignment(Label.RIGHT);
        setLayout(new BorderLayout());
        Panel labelPanel=new Panel();
        labelPanel.setLayout(new GridLayout(3,1));
        labelPanel.add(redLabel);
        labelPanel.add(greenLabel);
        labelPanel.add(blueLabel);
        Panel sliderPanel=new Panel();
        sliderPanel.setLayout(new GridLayout(3,1));
        sliderPanel.add(red);
        sliderPanel.add(green);
        sliderPanel.add(blue);
        Panel southPanel= new Panel();
        southPanel.setLayout(new BorderLayout());
        southPanel.add("West",labelPanel);
        southPanel.add("Center",sliderPanel);
        add("South",southPanel);
        
        /**
         * the next bit adds the adjusment listeners so the applet can
         * respond to the user's action on the scrollbars
         */
    
        red.addAdjustmentListener(this);
        green.addAdjustmentListener(this);
        blue.addAdjustmentListener(this);
        

    }
    
    /**
     * adjustmentValueChanged() is the method that handles AdjustmentEvents
     * which is when the value of a Scrollbar is changed
     */
    
    public void adjustmentValueChanged(AdjustmentEvent e)
    {
         redValue = red.getValue();
         greenValue = green.getValue();
         blueValue = blue.getValue();
         redLabel.setText("Red="+redValue);
         greenLabel.setText("Green="+greenValue);
         blueLabel.setText("Blue="+blueValue);
         repaint();
    }
    /**
     * /Here is a private method 
     * for converting integer values from 1-255 into percentages... 
     */
    private float percent(int x)
    {
        float p=(float)(x/255.0);
        int per=(int)Math.round(100*p);
        p=per/100.0F;
        return p;
    }
    /**
     * hex is a method for converting integer values from 0 to 255
     * into a hex String
     */
    private String hex(int x)
    {   
        
        String s=Integer.toHexString(x);
        s=s.toUpperCase();
        if (s.length()<2)
        {   
            s="0"+s;
        }
        return s;
        
    }
    /**
     * Paint is where it gets put together
     */
    public void paint( Graphics g)
    {
        //Draw the text description:
         g.setColor(Color.black);
         g.setFont (new Font("sansserif", Font.BOLD, 16));
         g.drawString( "Using 3 int arguments:\t Color c= new Color( "+redValue+", "+greenValue+", "+blueValue+" );", 10,20);
         g.drawString( "Using 3 float arguments:\t Color c= new Color( "+percent(redValue)+"F, "+percent(greenValue)+"F, "+percent(blueValue)+"F );", 10,40);
         g.drawString( "Using 1 hex argument:\t Color c= new Color( 0x"+hex(redValue)+hex(greenValue)+hex(blueValue)+" );", 10,60);
         g.drawString( "Using 1 int argument:\t Color c= new Color( "+(65536*redValue+256*greenValue+blueValue)+" );", 10,80);
         
         // Draw a big example of the color:
         g.setColor(new Color(redValue, greenValue, blueValue));  
         g.fillRoundRect(20, 100, 520, 300, 100,100);  
    }
    
}