grafik2d/Grafik2D/src/grafik2d/Kreis.java

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package grafik2d;

/**
 *
 * @author nobody
 */

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;
import java.util.logging.Logger;
import javax.swing.JComponent;

/**
 *
 * @author le
 */
public class Kreis extends JComponent implements Runnable
{
  private Ellipse2D.Float kreis;
  private BasicStroke pinsel;
  private float radius;
  private float minRadius;
  private float maxRadius;
  private Thread thd;
  private long schlafzeit;
  private static final float DICKE = 8f; 
  private static Logger lg = Logger.getLogger("grafik");
  
  public Kreis(long schlafzeit)
  {
    this.schlafzeit = schlafzeit;
    minRadius = DICKE;
    maxRadius = 100;
    kreis = new Ellipse2D.Float();
    pinsel = new BasicStroke(DICKE);
    radius = 10;
    thd = null;
  }
  
  public void start()
  {
    if (thd == null)
    {
      thd = new Thread(this);
      thd.start();
    }
  }
          
  
  @Override
  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    
    int breite = this.getWidth() - 1;
    int hoehe = this.getHeight() - 1;
    
    maxRadius = -DICKE/2f + Math.min(breite/2f, hoehe/2f);
    float x = breite/2f - radius;
    float y = hoehe/2f - radius;
    
    kreis.setFrame(x, y, radius*2, radius*2);
    
    g2.setStroke(pinsel);
//    g2.setPaint(Color.RED);
//    g2.fill(kreis);
    g2.setPaint(Color.BLACK);
    g2.draw(kreis);
    
  }

  @Override
  public void run()
  {
    float delta = 1f;
    while (true)
    {
      if (radius > maxRadius) delta = -1f;
      if (radius < minRadius) delta = +1f;
      radius += delta;
      this.repaint();
      try
      {
        Thread.sleep(schlafzeit);
      }
      catch (InterruptedException iex)
      {
        lg.warning(iex.toString());
      }
    }
  }
  
}