import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class MyFrame extends JFrame{
	
	// components of frame
	MyPanel mPanel;
	MyButton mButton;
	JComboBox mColorBox;

	// Constructor
	public MyFrame(String title){
		super(title); // calls the constructor of JFrame

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // when cross at top right is pressed
	
		// add components to MyFrame's container
		Container container = getContentPane();
		//container.setLayout( new FlowLayout() ); // BoxLayout is the default layout
		
		mPanel = new MyPanel();
		container.add("Center", mPanel);  // Center, South, North, East & West is for BoxLayout
		
		mButton = new MyButton();
		container.add("South", mButton);
		
		mColorBox = new JComboBox();
		mColorBox.addItem(Color.RED);
		mColorBox.addItem(Color.BLACK);
		mColorBox.addItem(Color.BLUE);
		mColorBox.addItem(Color.GREEN);
		mColorBox.addItem(Color.YELLOW);
		container.add("North", mColorBox);
		
		setSize(400, 500);
		System.out.print("MyFrame"); // output text
		System.out.println(" is constructed"); // ... with newline
	}

	 // The program start here
	public static void main( String[] args)	{
		MyFrame frame = new MyFrame("My First Application");

		// puts window in the middle of the screen
	//	Dimension frameSize = frame.getSize();
      //  Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        //frame.setLocation(screenSize.width / 2 - frameSize.width / 2, screenSize.height / 2 - frameSize.height / 2);

		frame.show(); // should be the last operation
	}
	//	MyButton Class
	class MyButton extends JButton {
		MyButton() {
			super("Enlarge Figure"); // add text of button
			enableEvents(AWTEvent.MOUSE_EVENT_MASK); // to activate processMouseEvent
		}
		protected void processMouseEvent(MouseEvent e){
			if (e.getID() == MouseEvent.MOUSE_CLICKED){
				mPanel.mSize += 10;
				System.out.println("Button "+e.getButton()+" clicked: new size = "+mPanel.mSize);
			}
		}
	}

	//	MyPanel Class
	class MyPanel extends JPanel{
		int mX, mY;
		int mSize = 50;
		
		MyPanel() {
			super();
			enableEvents(AWTEvent.MOUSE_EVENT_MASK); // to activate processMouseEvent
			setBackground(Color.white);
		}
		protected void processMouseEvent(MouseEvent e){
			if (e.getID() == MouseEvent.MOUSE_CLICKED){
				System.out.println("Button "+e.getButton()+" mouse pressed at x= "+e.getX()+", y="+e.getY());
				mX = e.getX();
				mY = e.getY();
				repaint(); // call whenever the component should be repainted after some changements
		 	}
		}
		public void paintComponent(Graphics g){ 
			super.paintComponent(g); // to draw background colors etc.
			g.setColor((Color) mColorBox.getSelectedItem() );
			g.drawOval(mX - mSize/2, mY - mSize/2, mSize, mSize);
			g.drawRect(mX - mSize/2, mY - mSize/2, mSize, mSize);
		}
	}
}