01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
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;
}
|
