Aufgabe8_Grafik2D/src/aufgabe8_grafik2d/Zeiger.java

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package aufgabe8_grafik2d;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Line2D;
import static java.lang.Math.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import javax.swing.JComponent;


/**
 *
 * @author ahren
 */
public class Zeiger extends JComponent implements Runnable
{
  private static final float DICKE = 4f;
  private Line2D.Float linie;
  private BasicStroke stift;
  private volatile double radius;
  private volatile float xMitte;
  private volatile float yMitte;
  private volatile double xAussen;
  private volatile double yAussen;
  private volatile double alpha;
  private long schlafzeit;
  private int zeigerlaenge;
  private ExecutorService eService;
  private Future task;

  
  /**
   * Initialisiert einen Zeiger.
   * @param schlafzeit: Ist die Zeit zwischen den Ticks
   * @param zeigerlaenge: Ist die länge des Zeigers
   */
  public Zeiger(long schlafzeit, int zeigerlaenge)
  {
    this.schlafzeit = schlafzeit;
    this.zeigerlaenge = zeigerlaenge;
    linie = new Line2D.Float();
    stift = new BasicStroke(DICKE);
    alpha = 0;
    eService = Executors.newSingleThreadExecutor();
    task = null;
  }

  @Override
  public void run()
  {
    float delta = 1f;
    while(true)
    {
      synchronized(this)
      {
        alpha += 0.1;
      }
      this.repaint();
      try
      {
        Thread.sleep(schlafzeit);
      }
      catch (Exception ex)
      {
        //lg.severe(ex.toString());
      }
    }
  }

  public void start()
  {
    if (task == null)
    {
      task = eService.submit(this);
    }
  }
  @Override
  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);

    float breite = this.getWidth() - 1;
    float hoehe = this.getHeight() - 1;

    radius = (min(hoehe, breite)/2 * 0.9) * 1/ zeigerlaenge;

    g2.translate(breite/2, hoehe/2);
    g2.rotate(alpha);


    xAussen = radius;
    yAussen = 0;

    linie.setLine(0, 0, xAussen, yAussen);
    g2.setStroke(stift);
    g2.setPaint(Color.RED);
    g2.draw(linie);
  }

}