//used to make a frame, which is a window with a title and a border
import javax.swing.JFrame;
//used to make a panel, which is a place to draw text and shapes 
import javax.swing.JPanel;
//has methods to set fonts, draw text, set colors, and draw shapes 
import java.awt.Graphics;
//has the colors that we can use
import java.awt.Color;
//used to create fonts
import java.awt.Font;

 /**
 * This panel displays Greetings In Different Languages & Colors..
 * Need To Add "extends JPanel", So That Can Use The Methods Of JPanel In Our Program.
 * This Is Called "Inheritance", which is a way of re-using software (code)
 * We will learn more about inheritance later in this class!
 *
 * @author William McDaniel Albritton
 */ 
public class HelloWorldPanel extends JPanel {
 
/**
* The main() method starts the program.
* This method Displays Greetings In Different Languages and Colors.
*
* @param args The commandline arguments are not used.
*/    
   public static void main(String[] args) {
   //create a frame with a title
      JFrame window = new JFrame("This is the title to the Hello World frame.");
   /* Create a panel to draw the text upon
   HelloWorldPanel is a class, which is used to create objects
   HelloWorldPanel is also the name of this file*/
      HelloWorldPanel panel = new HelloWorldPanel();
   //add the panel to the window
      window.setContentPane(panel);
   /* The default is to hide the JFrame when the user closes the window.
   owever, we want the window to stop running, when we close the window!*/  
      window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   /*Sets the location of the window, 
   where x is the first parameter, and y is the second parameter.
   0,0 is on the left (x) and at the top (y) of the screen.
   500, 0 is towards the middle of the screen at the top.
   0, 200 is on the left, towards the bottom.
   500, 200 is roughly in the middle of the screen*/   
      window.setLocation(500, 200);
   //sets the size of the window: width and height
      window.setSize(600,300);
   //if you do not set this parameter to "true", the window will be invisible!   
      window.setVisible(true);
   }//end of main() method 
 
/**
* The paintComponent() method draws the content of the panel.
* It draws the Greetings In Different Languages & Colors..
*
* @param page is the object on which we use the drawing methods  
*/
   public void paintComponent(Graphics page) {
   /*
   Calls the paintComponent method from the superclass JPanel.
   Initializes variables in superclass JPanel to default values.
   If not included, the setBackground() method will not work.
   */
      super.paintComponent(page);
    /* "this" Is An Object That Represents The JPanel Itself.
    Method "setBackground()" Sets The Background Color Of The JPanel.
    Use Object "Color.colorName" To Set The Colors.
    See The Java API For A List Of Colors.*/
      this.setBackground(Color.CYAN);
    /* "page" Is aN Object That Represents The JPanel's Display Area.  
    "setColor()" Is A Method That Sets The Color Of Any Object Drawn On The Page..*/
      page.setColor(Color.BLUE);
    /* Method "drawString()" Draws A String At A Specified X and Y Coordinate..
    Parameters: String, X-Coordinate, Y-Coordinate.
    X and Y Start At (0,0) ON The Top Left Corner Of The JPanel..  */
      page.drawString ("Hello, World!", 100, 50);
   //make a larger font
      Font largerFont = new Font("SansSerif", Font.BOLD, 24);
   //set the font, color, and draw a string   
      page.setFont(largerFont);  
      page.setColor(Color.RED);
      page.drawString ("Ohaiyou gozaimasu!", 100, 120);
   //make a computer font
      Font computerFont = new Font("Monospaced", Font.PLAIN, 48);
   //set the font, color, and draw a string   
      page.setFont(computerFont);      
      page.setColor(Color.ORANGE);
      page.drawString ("Salamat Pagi!", 100, 200);
      
   }//end of paintComponent() method
   
}//end of HelloWorldPanel class