package horstmann.ch08_applet;
import java.applet.Applet;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;

import javax.swing.Timer;

@SuppressWarnings("serial")
public class BannerApplet extends Applet
{
	public void init()
	{
		message = getParameter("message");
		String fontname = getParameter("fontname");
		int fontsize = Integer.parseInt(getParameter("fontsize"));
		delay = Integer.parseInt(getParameter("delay"));
		font = new Font(fontname, Font.PLAIN, fontsize);
		Graphics2D g2 = (Graphics2D) getGraphics();
		FontRenderContext context = g2.getFontRenderContext();
		bounds = font.getStringBounds(message, context);

		timer = new Timer(delay, event -> {
			start--;
			if (start + bounds.getWidth() < 0)
				start = getWidth();
			repaint();
		});
	}

	public void start()
	{
		timer.start();
	}

	public void stop()
	{
		timer.stop();
	}

	public void paint(Graphics g)
	{
		g.setFont(font);
		g.drawString(message, start, (int) -bounds.getY());
	}

	private Timer timer;
	private int start;
	private int delay;
	private String message;
	private Font font;
	private Rectangle2D bounds;
}