// loi normale.java - jpq - 10/10/99 - 14/12/99 - 30/03/07

import java.awt.event.* ;
import java.awt.* ;
import java.applet.* ;
import geo.* ;

public class loinormale extends java.applet.Applet
                    implements MouseListener, MouseMotionListener, ActionListener

{ Image img ;
  Graphics g ;
  int X, Y, Xp, Yp ;
  Repere R ;
  Droite xpx ;
  pt M, N ;
  PointSurDroite A, B ;
  pointlibre O, I ;
  Segment S ;
  gauss cf ;
  int modepaint = -1 ;
  Button ok ;
  TextField ta, tb, tarr ;
  int arrond ;
  double darrond ;
  
////////////////////////////////////////////////////////////////////////////////

  private void ajoutLabel (Font f, String s)
  { Label lbl = new Label (s);
    lbl.setFont (f) ;
    add (lbl) ;
  }

  public void init ()
  { setBackground (Color.white) ;
    modepaint = 1 ;
    img = createImage (getSize().width, getSize().height) ;
    g = img.getGraphics () ;
    addMouseMotionListener (this) ;
    addMouseListener (this) ;
    Font f = new Font ("Arial", Font.PLAIN, 10) ;
    ajoutLabel (f, "a =");
    add (ta = new TextField ("0.5", 4)) ;
    ta.setFont (f) ;
    ajoutLabel (f, "b =") ;
    add (tb = new TextField ("1.0", 4)) ;
    tb.setFont (f) ;
    ajoutLabel (f, "          déc:") ;
    add (tarr = new TextField ("2", 1)) ;
    tarr.setFont (f) ;
    arrond = 2 ;
    darrond = 100.0 ;
    add (ok = new Button ("Ok")) ;
    ok.setFont (f) ;
    ok.addActionListener (this) ;
    R = new Repere (getSize().width / 2, getSize().height - 20, getSize().width, getSize().height, 50, 100) ;
    O = new pointlibre (0.0, 0.0, "O", R) ;
    xpx = new Droite (0.0, 1.0, 0.0, "", R) ;
    A = new PointSurDroite (0.5, 0.0, xpx, "a", R) ;
    B = new PointSurDroite (1.0, 0.0, xpx, "b", R) ;
    I = new pointlibre (1.0, 1.0, "I", R) ;
    cf = new gauss ("", R) ;
    M = new pt ("", R) ;
    N = new pt ("", R) ;
    S = new Segment ("", R) ;
  }

  public void update (Graphics g1)
  { paint (g1); }

  private String sarrondi (double d)
  { if (arrond >= 0) d = Math.floor (d * darrond) / darrond ;
    return Double.toString (d) ;
  }

  public void paint (Graphics g1)
  { Font f = new Font ("Arial", Font.PLAIN, 10);
    g.setFont (f);
    g.setColor (getBackground ());
    g.fillRect (0, 0, R.XMAX, R.YMAX) ;

    if (modepaint == 0)
      { if ((O.deplace) || (I.deplace))
        { if (O.deplace) R.Repere (R.Iabs (O.x), R.Iord (O.y), getSize().width, getSize().height, R.unitex, R.unitey) ;
          else
          { double Ix = I.x ; double Iy = I.y ;
            if ((Ix > 0.0) && (Iy > 0.0)) R.Repere (R.X0, R.Y0, getSize().width, getSize().height, (double) (R.Iabs (Ix) - R.X0), (double) (R.Y0 - R.Iord (Iy))) ;
          }
        }
      O.point (0.0, 0.0) ;
      I.point (1.0, 1.0) ;
      A.point () ;
      B.point () ;
      ta.setText (sarrondi (A.x)) ;
      tb.setText (sarrondi (B.x)) ;
    }

    g.setColor (Color.black) ;
    if (modepaint == 1)
      if (X > 0)
      { g.drawString ("point mobile", X, Y) ;
        Xp = X ; Yp = Y ; X = -1 ;
      }
    g.setColor (Color.green) ;
    int Xdeb = (A.X <= B.X) ? A.X : B.X ;
    int Xfin = (A.X <= B.X) ? B.X : A.X ;
    if (Xdeb < 0) Xdeb = 0 ;
    if (Xfin > getSize().width) Xfin = getSize().width ;
    for (int X = Xdeb ; X < Xfin ; X ++)
    { double abscisse = R.Abs (X) ;
      M.point (abscisse, 0.0) ;
      N.point (abscisse, cf.image (abscisse)) ;
      S.Segment (M, N) ;
      S.trace (g) ;
    }

    g.setColor (Color.red) ;
    R.trace (g) ;
    O.trace (g) ;
    I.trace (g) ;
    A.trace (g) ;
    B.trace (g) ;

    g.setColor (Color.blue) ;
    cf.trace (g) ;

    g.setColor (Color.black) ;
    R.cadre (g) ;

    double x1 = (A.x <= B.x) ? A.x : B.x ;
    x1 = cf.integre (x1) ;
    double x3 = (A.x <= B.x) ? B.x : A.x ;
    x3 = cf.integre (- x3) ;
    g.drawString ("Probas : " + sarrondi (x1) + " " + sarrondi (1.0 - x1 - x3) + " " + sarrondi (x3), 10, getSize().height - 10) ;
    g1.drawImage (img, 0, 0, this) ;
  }

  public void mousePressed (MouseEvent e)
  { e.consume () ;
    if (O.zone (e.getX (), e.getY ()) || A.zone (e.getX (), e.getY ())
        || I.zone (e.getX (), e.getY ()) || B.zone (e.getX (), e.getY ()))
    { modepaint = 0 ;
      X = -1 ;
    }
  }

  public void mouseDragged (MouseEvent e)
  { e.consume () ;
    O.bouge (e.getX (), e.getY ()) ;
    A.bouge (e.getX (), e.getY ()) ;
    B.bouge (e.getX (), e.getY ()) ;
    I.bouge (e.getX (), e.getY ()) ;
    repaint () ;
  }

  public void mouseReleased (MouseEvent e)
  { e.consume () ;
    O.deplace = A.deplace = B.deplace = I.deplace = false ; modepaint = 1 ;
  }

  public void mouseMoved (MouseEvent e)
  { e.consume () ;
    if (modepaint == 1)
    { if (O.zone (e.getX (), e.getY ()) || A.zone (e.getX (), e.getY ())
          || I.zone (e.getX (), e.getY ()) || B.zone (e.getX (), e.getY ()))
      { this.X = e.getX () + 2 ; this.Y = e.getY () + 8 ;
        O.deplace = A.deplace = B.deplace = I.deplace = false ;
      }
      repaint () ;
    }
  }

  public void mouseClicked (MouseEvent e) { }
  public void mouseEntered (MouseEvent e) { }
  public void mouseExited (MouseEvent e) { }

  public void actionPerformed (ActionEvent e)
  { if (e.getSource () == ok)
    { try { A.x = new Double(ta.getText()).doubleValue() ; }
      catch (NumberFormatException nfe) { }
      try { B.x = new Double(tb.getText()).doubleValue() ; }
      catch (NumberFormatException nfe) { }
      try { arrond = Integer.parseInt (tarr.getText ()) ; }
      catch (NumberFormatException nfe) { }
      tarr.setText (Integer.toString (arrond)) ;
      if (arrond >= 0) darrond = Math.pow (10.0, arrond) ;
      modepaint = 0 ;
      repaint () ;
    }
  }

  public String getAppletInfo ()
  { return "loinormale par j.-p. Quelen" ; }

}