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/* Listing3415.java */
import java.awt.*;
import java.awt.event.*;
public class Listing3415
extends Frame
implements Runnable
{
private Thread th;
private int actx;
private int dx;
private int actarc1;
private int actarc2;
private Image dbImage;
private Graphics dbGraphics;
public static void main(String[] args)
{
Listing3415 frame = new Listing3415();
frame.setSize(210,170);
frame.setVisible(true);
frame.startAnimation();
}
public Listing3415()
{
super("Ameisenanimation");
addWindowListener(new WindowClosingAdapter(true));
}
public void startAnimation()
{
Thread th = new Thread(this);
th.start();
}
public void run()
{
actx = 0;
dx = 1;
actarc1 = 0;
actarc2 = 0;
while (true) {
repaint();
actx += dx;
if (actx < 0 || actx > 100) {
dx = -dx;
actx += 2*dx;
}
actarc1 = (actarc1 + 1) % 360;
actarc2 = (actarc2 + 2) % 360;
try {
Thread.sleep(40);
} catch (InterruptedException e) {
//nichts
}
}
}
public void update(Graphics g)
{
//Double-Buffer initialisieren
if (dbImage == null) {
dbImage = createImage(
this.getSize().width,
this.getSize().height
);
dbGraphics = dbImage.getGraphics();
}
//Hintergrund l�schen
dbGraphics.setColor(getBackground());
dbGraphics.fillRect(
0,
0,
this.getSize().width,
this.getSize().height
);
//Vordergrund zeichnen
dbGraphics.setColor(getForeground());
paint(dbGraphics);
//Offscreen anzeigen
g.drawImage(dbImage,0,0,this);
}
public void paint(Graphics g)
{
int xoffs = getInsets().left;
int yoffs = getInsets().top;
g.setColor(Color.lightGray);
g.fillOval(xoffs+actx,yoffs+20,100,100);
g.setColor(Color.red);
g.drawArc(xoffs+actx,yoffs+20,100,100,actarc1,10);
g.drawArc(xoffs+actx-1,yoffs+19,102,102,actarc1,10);
g.setColor(Color.blue);
g.drawArc(xoffs+actx,yoffs+20,100,100,360-actarc2,10);
g.drawArc(xoffs+actx-1,yoffs+19,102,102,360-actarc2,10);
}
}
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