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MANDEL3.PAS

Program Mandel;
Uses CRT,DOS;

var
   X1,X2,Y1,Y2 :real;
   IncX,incY   :real;
   Limite      :byte;
   coul        : array [1..64522] of byte;
   nom         : string;
   reg         : Registers;
   handle      : word;

Const
     BaseEcran  = 320;
     HautEcran  = 200;
     IncLigne   =   1;
     IncColonne =   1;
     Pointeur:word  = 1;

PROCEDURE Initialisation;
BEGIN
CLRSCR;
Writeln(' ':10,'ZOOM SUR L''ENSEMBLE DE MANDELBROT');
Writeln(' ':10,'==================================');

Gotoxy(1,10);
writeln('Entrez une fenêtre carrée:');
Gotoxy(1,12);
write('Intervalle sur l''axe réel ...... [X1 , X2] ? ');
readln (X1,X2);
write('Intervalle sur l''axe imaginaire  [Y1 , Y2] ? ');
readln (Y1,Y2);
write('Nombre limite d''iteration ...... Limite    ? ');
readln (Limite);
WriteLn;
write('Nom du Fichier (5 Lettres Max) : ');READ(NOM);

IncX   :=(X2-X1)/BaseEcran;
incY   :=(Y2-Y1)/HautEcran;
END;

PROCEDURE MandelBrot;
Var
   Ligne,Colonne,Compt   :integer;
   P0,Q0,Module,X,Y,Aux  :real;
   r:byte;

BEGIN
Colonne:=0;
while Colonne<= BaseEcran do
      Begin
      P0:= X1+Colonne*IncX;
      Ligne:=0;
      while Ligne<=HautEcran do
            begin
            Q0:= Y1+Ligne*IncY;
            X:=0;
            Y:=0;
            Compt:=1;
            Module:=0;
            while (compt<= Limite) and (Module<4) do
                  begin
                  Aux:=X;
                  X:=sqr(X)-sqr(Y)+P0;
                  Y:=2*Y*Aux+Q0;
                  Module:=sqr(X)+sqr(Y);
                  Inc(compt);
                  end;
            if Module>4 then
               begin
               r := Compt mod 256;
               coul[Pointeur]:=r;
               end else coul[Pointeur]:=0;
            inc(Pointeur);
            GotoXY(1,22);Write(Pointeur);
            Ligne:=Ligne+IncLigne;
            end;
      Colonne:=Colonne+IncColonne;
      end;
END;

PROCEDURE SauveTableau(dds,ssi : word);
BEGIN
  reg.ax:=$3c00;
  reg.cx:=    0;
  reg.ds:=seg (nom);
  reg.dx:=ofs (nom)+1;
  intr($21,reg);
  handle:=reg.ax;

  reg.ds:=seg (nom);
  reg.dx:=ofs (nom)+1;
  reg.ax:=$3d42;
  intr($21,reg);
  handle:=reg.ax;


      reg.ax:=$4000;
      reg.ds:= dds;
      reg.dx:= ssi;               { offset mém  }
      reg.cx:= Pointeur;
      reg.bx:= handle;
      intr($21,reg);

  reg.ax:=$3e00;
  reg.bx:=handle;
  intr($21,reg);

END;

BEGIN
Initialisation;
Mandelbrot;
nom := NOM +'.clr'+Chr(0);
SauveTableau(seg (coul),ofs(coul));
END.