/* Auteur: Nicolas JANEY         */
/* nicolas.janey@univ-fcomte.fr  */
/* Novembre 2001                 */

import java.util.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.applet.*;
import com.sun.j3d.utils.applet.MainFrame;

public class GrandeOurse3DJava2D extends Applet implements MouseListener,MouseMotionListener {

  private int initX = 0 ;
  private int initY = 0 ;
  private int px = 0 ;
  private int py = 0 ;
  private int dx = 0 ;
  private int dy = 0 ;
  private Vector3d eta = new Vector3d( 2.6782868 , 0.95249915 ,10.211735-8);
  private Vector3d miz = new Vector3d( 1.3972227 , 0.11056229 , 7.9981213-8);
  private Vector3d dze = new Vector3d( 1.3814067 , 0.11733321 , 8.1529656-8);
  private Vector3d eps = new Vector3d( 0.70122137, 0.080953359, 7.6173640-8);
  private Vector3d del = new Vector3d( 0.0       , 0.0        , 8.04-8);
  private Vector3d gam = new Vector3d(-0.8883190 , 0.82615963 ,15.251831-8);
  private Vector3d alp = new Vector3d(-1.4533803 ,-1.0239428  , 9.6983930-8);
  private Vector3d bet = new Vector3d(-1.2871224 ,-0.10782208 , 7.1645021-8);
  private float dz = 8.0F;

  public void init() {
    setBackground(Color.black);
    addMouseMotionListener(this);
    addMouseListener(this);
  }

  public void positionEcran(Vector3d e,Vector3d ecr,float ay,float ax) {
    Transform3D t = new Transform3D();
    t.toRotationY(-ay);
    Vector3d e1 = t.mult(e);
    t.toRotationX(-ax);
    Vector3d e2 = t.mult(e1);
    float x =(float) e2.x;
    float y =(float) e2.y;
    float z =(float) e2.z+dz;
    x /= z;
    y /= -z;
    ecr.x = x*300+128;
    ecr.y = y*300+128;
    ecr.z = z;
  }

  public void afficheEtoile(Vector3d e,float dz,float ax,float ay,Graphics2D g2) {
    Vector3d v = new Vector3d();
    ax *= 3.14159F/180.0F;
    ay *= 3.14159F/180.0F;
    positionEcran(e,v,ax,ay);
    g2.fill(new Ellipse2D.Double(v.x-3,v.y-3,6,6)) ;
  }

  public void afficheLiaison(Vector3d e1,Vector3d e2,float dz,float ax,float ay,Graphics2D g2) {
    Vector3d v1 = new Vector3d();
    Vector3d v2 = new Vector3d();
    ax *= 3.14159F/180.0F;
    ay *= 3.14159F/180.0F;
    positionEcran(e1,v1,ax,ay);
    positionEcran(e2,v2,ax,ay);
    g2.draw(new Line2D.Double(v1.x,v1.y,v2.x,v2.y)) ;
  }

  public void paint(Graphics g) {
    Graphics2D g2 =(Graphics2D) g;
    g2.setColor(Color.white) ;
    afficheEtoile(eta,dz,dx,dy,g2);
    afficheEtoile(miz,dz,dx,dy,g2);
    afficheEtoile(dze,dz,dx,dy,g2);
    afficheEtoile(eps,dz,dx,dy,g2);
    afficheEtoile(del,dz,dx,dy,g2);
    afficheEtoile(gam,dz,dx,dy,g2);
    afficheEtoile(alp,dz,dx,dy,g2);
    afficheEtoile(bet,dz,dx,dy,g2);
    afficheLiaison(eta,dze,dz,dx,dy,g2);
    afficheLiaison(dze,eps,dz,dx,dy,g2);
    afficheLiaison(eps,del,dz,dx,dy,g2);
    afficheLiaison(del,gam,dz,dx,dy,g2);
    afficheLiaison(del,alp,dz,dx,dy,g2);
    afficheLiaison(alp,bet,dz,dx,dy,g2);
    afficheLiaison(bet,gam,dz,dx,dy,g2);
  }

  public String getAppletInfo() {
    return "La Grande Ourse en Java2D.";
  }

  public void mouseDragged(MouseEvent e) {
    int x = e.getX();
    int y = e.getY();
    dx = px + x - initX;
    dy = py + y - initY;
    repaint();
  }

  public void mouseMoved(MouseEvent e) {
  }

  public void mouseClicked(MouseEvent e) {
  }

  public void mouseEntered(MouseEvent e) {
    int x = e.getX() ;
    int y = e.getY() ;
/*    System.out.println(x+" "+y);
    PopupMenu pm = new PopupMenu("Hello");
    MenuItem mi1 = new MenuItem("Avec les noms");
    MenuItem mi2 = new MenuItem("Sans les noms");
    pm.add(mi);
    this.add(pm);
    pm.show(this,x,y);*/
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mousePressed(MouseEvent e) {
    px = dx ;
    py = dy ;
    initX = e.getX() ;
    initY = e.getY() ;
  }

  public void mouseReleased(MouseEvent e) {
    int x = e.getX();
    int y = e.getY();
    dx = px + x - initX;
    dy = py + y - initY;
    repaint();
  }

  public static void main(String[] args) {
    new MainFrame(new GrandeOurse3DJava2D(),256,256);
  }
}