/** 
  * Tuned Circuit Attenuation Function Generator
  * @author Robert J Morton YE572246C
  * @version 25 November 2001 revamped 16 November 2007
  * Converted to a JFramed application  Thu 05 Oct 2017  */

/* Open a terminal and change directory to where this file is loacated.
   To compile this program, enter the terminal command: javac tuning_start.java
   To run this program, enter the terminal command: java tuning_start */

import javax.swing.*;
import java.awt.Dimension;  // to be able to set the preferred JFrame size
import java.awt.Color;      // to be able to set JFrame background colour


public class tuning_start extends JFrame {

  private static final long 
    serialVersionUID = 4447L;  // what the hell this is for, I don't know!

  private int
    XE = 230,  // Horizontal extent of window and JFrame.
    YE = 254;  // Vertical extent of window and JFrame.

  /* Declare a reference to an instance of the child class. Beware:
  an instance of the child class cannot be created here because this 
  must be done within the invokeAndWait environment. */
  private tuning LG; 

  private tuning_start() {  // construct an instance of this extended JFrame

    //set window frame title on title bar
    super("Tuned Circuit Attenuation Function Generator");

    /* Set up the window listener to listen for the window close command which
    occurs when the user clicks on the X control in the window's title bar.*/
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    /* Set the initial size of the extended JFrame. This is the area INSIDE 
    the frame. It does not include the border or the title bar areas. */
    setPreferredSize(new Dimension(XE, YE));

    setBounds(0,0,XE,YE);        // of area inside window frame
    setBackground(Color.black);  //  default background colour of JFrame
    LG = new tuning();           //new instance of tuning_start class
    getContentPane().add(LG);    // add it to the extended JFrame's pane.
    pack();                      // should automatically pack to fill JFrame
    setVisible(true);            // make this extended JFrame visible
  }


  public static void main(final String[] args) {

   /* Initiate the creation of a new instance of this extended JFrame and
      then wait until the building process has completely finished before
      giving the new instance of the child class permission to commence
      running. */

    try {
      javax.swing.SwingUtilities.invokeAndWait(
        new Runnable(){public void run(){new tuning_start();}});
    } catch(Exception e) {
      System.out.println("Couldn't create Swing GUI.");
      System.out.println("There's probably an error in the constructor");
      System.out.println("code of one of this class's child classes.");
      System.out.println(e);
      System.out.println(e.getCause()); 
    }
  }  // end of main()

  /* The above try-catch sequence is necessary for the following reason. The
  statement "new tuning_start();" is a request to Swing to create a GUI in-
  stance of this application. It includes, in effect, all the statements in
  the constructor methods of all this class's child classes. All these requ-
  ests are made on this, the main() program thread. 

  However, these requests are carried out [ie the actual constructing is
  done] by the underlying Swing system on the Event Despatching Thread. 
  The constructing process necessarily takes longer to do than the mere
  task of REQUESTING that the constructing be done. This means that the
  main() thread will set the run() thread in motion before the GUI has 
  finished being constructed. Hence trouble.

  The solution is to force the main() thread to withhold permission for 
  the run() thread to start its job until the Event Despatching Thread 
  has completely finished constructing the GUI. */

  /* NOTE: This class inherits a paint() method from the JFrame class that 
  it extends. This method automatically calls the paint() method of the
  child [extended JPanel] class when necessary. */


}  // end of tuning_start class