BA Karlsruhe, Vorlesung Programmieren, „Threads“

Aufgabe 2 „Tanzende Schrift” (Lösung B)
import javax.swing.JApplet;
import java.awt.*;
public class TanzendeSchrift extends JApplet implements Runnable {
static Color[] Palette = {Color.black, Color.blue, Color.cyan, Color.darkGray,
Color.gray, Color.green, Color.magenta, Color.orange, Color.pink,
Color.red, Color.white, Color.yellow
};
Thread thread;
@Override
public void start() {
if (thread == null) {
setSize(220, 100);
thread = new Thread(this, "Schrift");
thread.start();
}
}
public void run() {
while (thread != null)
try {
repaint();
Thread.sleep(200);
} catch (InterruptedException e) { }
}
@Override
public void paint(Graphics g) {
g.setColor(Color.WHITE); // vorherigen Fensterinhalt löschen
g.fillRect(0, 0, this.getWidth(), this.getHeight());
char text[] = "Tanzende Schrift".toCharArray();
g.setFont(new Font("Helvetica", Font.BOLD, 20));
FontMetrics m = g.getFontMetrics();
int height = m.getHeight() + 5;
int width = m.charWidth(text[0]);
for (int i = 1; i < text.length; i++)
if (m.charWidth(text[i]) > width)
width = m.charWidth(text[i]);
for (int i = 0; i < text.length; i++) {
int start = (int) Math.round(20 * Math.random());
g.setColor(Palette[start % Palette.length]);
g.drawChars(text, i, 1, i * width, height + start);
}
}
}
@Override
public void stop() {
if (thread != null) {
thread = null;
}
}