/* Numerik-I, Aufgabe 16, bearbeitet von ...........
*/
import java.awt.*;
import java.awt.Graphics;
import java.awt.event.*;

class Fenster extends Frame implements WindowListener { //Fenster für Graphikausgabe
  Fenster() {//Konstruktor
    super("Bildausgabe");
    setSize(480,480);
    addWindowListener(this);
  }
  public void windowClosing(WindowEvent e) {//Fenster schließen
    System.exit(0);
  }
  public void windowOpened(WindowEvent e) { }
  public void windowClosed(WindowEvent e) { }
  public void windowActivated(WindowEvent e) { }
  public void windowDeactivated(WindowEvent e) { }
  public void windowIconified(WindowEvent e) { }
  public void windowDeiconified(WindowEvent e) { }

  double[] ua,va; // = Speicher Spline-Koeffizienten

  // Auswertung Spline an Stelle x:
  static double splwert(double x, int n, double[] a) {
 /*  Eigene Anweisungen zur Spline-Auswertung
 */
  }

  public void paint(Graphics g) { // Zeichnet 2D-Kurve
    int s0,z0,s1,z1;
    double t;
    s1 = (int) Math.round(splwert(0.0,8,ua));
    z1 = (int) Math.round(splwert(0.0,8,va));
    for (int i=1; i<=480; i++) {
      s0 = s1; z0 = z1;
      t = i/60.0;
      s1 = (int) Math.round(splwert(t,8,ua));
      z1 = (int) Math.round(splwert(t,8,va));
      g.drawLine(s0,z0,s1,z1);
    }
  }
}

class Aufg16 {

  static void tgauss(int n, double[] a){ //Löst Lineares System [1..n-1] für Spline
    double[] d = new double[n]; //Speicher Hauptdiagonale
    d[1] = 4.0; // LGS lösen, Diagonale=4
    for (int i=2; i<n; i++) { //Elimination
      d[i] = 4-1/d[i-1];
      a[i] = a[i]-a[i-1]/d[i-1];
    } // Auflösung:
    a[n-1] = a[n-1]/d[n-1];
    for (int i=n-2; i>0; i--) {
      a[i] = (a[i]-a[i+1])/d[i];
    }
  }

  public static void main(String args[]) {
    Fenster f = new Fenster(); // neues Graphik-Fenster f

    f.ua = new double[9];
    f.va = new double[9];
 /*  Eigene Anweisungen zur Berechnung der Bezier-Koeffizienten
    f.ua, f.va
*/
    f.setVisible(true); //ruft f.paint auf
    //f.repaint();
  }
}