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

public class Scribble extends Applet{
	private int last_x = 0;
	private int last_y = 0;
	private Color current_color = Color.black;
	private Button clear_button;
	private Choice color_choices;

	//Called to initialize the applet.
	public void init()
	{
		// Set the background color
		this.setBackground(Color.white);

		// Create a button and add it to the applet.
		// Also, set the button's colors
		clear_button = new Button("Clear");
		clear_button.setForeground(Color.black);
		clear_button.setBackground(Color.lightGray);
		this.add(clear_button);

		// Create a menu of colors and add it to the applet.
		// Also set a menu's colors and add a label.
		color_choices = new Choice();
		color_choices.addItem("black"); 
		color_choices.addItem("red"); 
		color_choices.addItem("yellow"); 
		color_choices.addItem("green"); 
		color_choices.addItem("blue"); 
		color_choices.setForeground(Color.black);
		color_choices.setBackground(Color.lightGray);
		this.add(color_choices);
	}

	// Called when the user clicks the mouse to start scribble
	public boolean mouseDown(Event e, int x, int y)
	{
		last_x = x; last_y = y;
		return true;
	}

	// Called when the user scribbles with the mouse button down
	public boolean mouseDrag(Event e, int x, int y)
	{
		Graphics g = this.getGraphics();
		g.setColor(current_color);
		g.drawLine(last_x,last_y,x,y);
		last_x = x;
		last_y = y;
		return true;
	}

	// Called when the user clicks the button or chooses a color
	public boolean action(Event event, Object arg)
	{
		// If the Clear Button was clicked on, handle it.
		if(event.target == clear_button){
			Graphics g = this.getGraphics();
			Rectangle r = this.bounds();
			g.setColor(this.getBackground());
			g.fillRect(r.x,r.y,r.width,r.height);
			return true;
		}
		// Otherwise if a color was chosen, handle that.
		else if(event.target == color_choices){
		       if(arg.equals("black"))  current_color=Color.black;
		  else if(arg.equals("yellow")) current_color=Color.yellow;
		  else if(arg.equals("red"))    current_color=Color.red;
		  else if(arg.equals("green"))  current_color=Color.green;
		  else if(arg.equals("blue"))   current_color=Color.blue;
		  return true;
		}
		// Otherwise, let the superclass handle it.
		else return super.action(event,arg);
	}
}