// File:  Paint.java
//
// Developed by Mehmet Sen. Spring 1996
// Ported to Java 1.1 by Ozgur Balsoy. Fall 1997

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

public class Paint 
		extends Applet 
		implements ActionListener // must overwrite actionPerformed() method
{
	Label Status;
	DrawCanvas c;
	
    public void init() {
		setLayout(new BorderLayout());

		setBackground(Color.gray);
		setForeground(Color.black);

		Panel w=new Panel();
		w.setLayout(new GridLayout(7,0));
		
		Button b;
		w.add(b=new Button("Rect"));
		b.addActionListener(this);			// the applet is one of the listeners
		w.add(b=new Button("Round"));
		b.addActionListener(this);			// the applet is one of the listeners
		w.add(b=new Button("Circ"));
		b.addActionListener(this);			// the applet is one of the listeners
		w.add(b=new Button("Line"));
		b.addActionListener(this);			// the applet is one of the listeners
		w.add(b=new Button("Draw"));
		b.addActionListener(this);			// the applet is one of the listeners
		w.add(b=new Button("Redraw"));
		b.addActionListener(this);			// the applet is one of the listeners
		w.add(b=new Button("Clear"));
		b.addActionListener(this);			// the applet is one of the listeners
		add(BorderLayout.WEST, w);

		Status=new Label("Status Line");
		Panel p=new Panel();
		p.setBackground(Color.gray);
		p.add(Status);
		add(BorderLayout.SOUTH,p);

		c=new DrawCanvas();
		c.setBackground(Color.blue);
		add(BorderLayout.CENTER, c);
	}

	public void paint(Graphics g) {
		c.paint(g);
	}

	public void actionPerformed(ActionEvent e) {
	 	String command = e.getActionCommand();

		// We want to change the label of the button,
		// but getSource function returns an Object type object.
		// By type casting, we use it as if it is a button object.
		// Actually, it is a button, but getSource returns it 
		// as an Object type object.
		// Note: We cannot use type casting if we are not sure 
		// that the returning object is a button. In this case, 
		// it is safe to use the following code:
		// if (e.getSource() instanceof Button) {
		//		Button b=(Button)e.getSource();
		//		...
		Button b=(Button)e.getSource();

		Status.setText(command);
		if (command.equals("Draw")) {
			b.setLabel("Fill");
			c.fill=false;
		} else if (command.equals("Fill")) {
			b.setLabel("Draw");
			c.fill=true;
		} else c.setDrawMode(command);
	}
}