grafik/src/grafik/Gerade.java

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package grafik;

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.awt.geom.Line2D;
import java.util.logging.Logger;
import javax.swing.JComponent;

/**
 *
 * @author le
 */
public class Gerade extends JComponent implements Runnable
{
  private Line2D.Double line;
  private BasicStroke pinsel;
  private float angle;
  private float radius;
  private Thread thd;
  private long sleepTime;
  private static final float DICKE = 8f; 
  private static Logger lg = Logger.getLogger("grafik");
  
  public Gerade(long sleepTime)
  {
    this.sleepTime = sleepTime;
    line = new Line2D.Double();
    angle = 0;
    radius = 100;
    pinsel = new BasicStroke(DICKE);
    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;
    
    float x1 = breite/2f;
    float y1 = hoehe/2f;
    
    float x2 = (float) Math.sin(angle);
    float y2 = 2;
    
    
    line.setLine(x1, y1, x2, y2);
    
    g2.setStroke(pinsel);
    g2.setPaint(Color.RED);
    g2.fill(line);
    g2.setPaint(Color.BLACK);
    g2.draw(line);
    
  }

  @Override
  public void run()
  {
    while (true)
    {
      if(angle >= 360){
        angle = 0;
      } else {
        angle += 1;
      }
      
//      if (radius > maxRadius) delta = -1f;
//      if (radius < minRadius) delta = +1f;
//      radius += delta;
      this.repaint();
      try
      {
        Thread.sleep(sleepTime);
      }
      catch (InterruptedException iex)
      {
        lg.warning(iex.toString());
      }
    }
  }
  
}