import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Toolkit;

import javax.swing.JComponent;

/**
 * The panel to hold the image of venus and a message.
 * 
 * @author Barbara Lerner
 */
public class VenusPanel extends JComponent {
	// Two constants to hold the 2 message choices.
	private static final String HI = "Hello from Venus!"; 
	private static final String BYE = "Bye from Venus!";
	
	// The message currently displayed.
	private String msg = HI;

	/**
	 * Draw the component
	 * @param g the graphics object to draw on.
	 */
	public void paintComponent(Graphics g) {
		// Find out how big the panel is.
		Dimension d = getSize();
		
		// Make the background black by drawing a black rectangle the size of the panel.
		g.setColor(Color.black);
		g.fillRect(0, 0, d.width, d.height);
		
		// Select the font and color for the message.  24 is the font size.
		// The color is specified in RGB.  Each parameter can range from 0 to 255.
		g.setFont(new Font("Helvetica", Font.BOLD, 24));
		g.setColor(new Color(255, 215, 0)); // gold color
		
		// Draw the message at coordinate (40, 25), 40 pixels from the left and 25 pixels from the
		// top of the panel.
		g.drawString(msg, 40, 25);
		
		// Read the image from the file and draw it at (20, 60).
		g.drawImage(Toolkit.getDefaultToolkit().getImage("Venus.gif"), 20, 60, this);
	}

	/**
	 * Display the hi message
	 */
	public void sayHi() {
		msg = HI;
		
		// Cause the panel to be redrawn with the new message.
		//repaint();
	}
	
	/**
	 * Display the bye message.
	 */
	public void sayBye() {
		msg = BYE;
		//repaint();
	}


}