Changes: 


      Version 2.03 has no fundamental differences from version 2.02. The basic
  achievement of this version is a  significant  speed  improvement. Also, 
  little bug fixed and added the two new functions: CConj and CConjV.
  Besides the constant CPixel was added. This constant contains the source 
  complex value of the pixel which is currently calculated (i.e. Z0).

      The version 2.03 is a further development of the compiler and contains 
  many new complex-variable functions.  There are now 30 such functions. But 
  the main innovation is that in the formulae two selectors of functions can 
  be used, operate with which it is possible from the "Select fractal" window. 
  So, now the formulae can be changed without compilation. In the following 
  version we shall try to optimise libraries and to increase speed of 
  calculations.

      Version 2.01 of the formula compiler has few but very important changes. 
  First of all, now you do not need to write the difficult expressions for 
  formula realization. We have added support for many operations and functions 
  of complex values. Also, we added four complex variables for using in your 
  functions. In part number [5] we describe these new possibilities. Please, 
  read it before using the formula compiler.




      
       
              Asknowledgements: 


  Bradley Beacham for
                   FRMTUTOR.TXT
               AN INTRODUCTION TO
           THE FRACTINT FORMULA PARSER

  Borland /Inprise/ Corp. for Delphi Command Line compiler




      
 
              Limitations: 

      Our formula compiler is not a parser. It's part of the programme, which
  calculates one step of the iteration process. It can't read formula directly, 
  since the complex type is non-standart type for Delphi.




      
 
              Introduction: 



        3.1   What is the formula compiler ?

      It is a new part of the fractal-generating programme, Fractal Explorer
  (version 1.13 and greater).

      FE has many different types of the fractal formulae itself, the formula
  compiler allows you to add new fractals without having to change the programme. 
  These formulae are stored in fractal spot files, and may be viewed and
  edited by anuther user.


        3.2   Formula Files

      New formulae will be not saved to another file. Formula will be stored as
  fractal spot file (*.frs),  which  contain internal data for generating of the 
  image. Therefore, FE requires one FRS file for building one image (and the 
  formula is already implemented into the file).





      
 
              Formula anatomy: 


      Why a compiler ?
  Compiled programmes always work more quickly than interpreter.

      However, don't be surprised that the formulae written by you work too 
  slowly. Please remember that the formulae that are built into the programme 
  are specially optimised for calculation speed. Unfortunately, such 
  optimisation is impossible for the formulae connected from the outside. 
  We continue to work with this problem and we hope to solve it in the future. 
  So, you can see, what each new version works quickly then previous.  :o)



        4.1   Formula it's a program

      Fractal Explorer uses a formula's text for building Dinamic Link Libraries
  (DLL), and after that loads the new DLL (for interest - look to the system TEMP 
  folder: strings "SET TMP=" or "SET  TEMP=" in your c:\autoexec.bat). 
  When the formula changed (or FE closed) the DLL will be unloaded from memory 
  and deleted with the project source.


        4.2   Formula it's a Delphi/Pascal program

      To compile a new formula, FE will create the Delphi project file (*.DPR)
  in the temporary folder and execute Borland Delphitm Command Line compiler 
  to generate the DLL file.

      Since we are using Delphi for writing Fractal Explorer, we are using 
  Delphi for DLL compilation.


        4.3   Requirements

      To use the Formula Compiler in FE the files listed below are required: 
      
      dcc32    exe
      math     dcu
      sharemem dcu
      sysinit  dcu
      system   dcu
      sysutils dcu
      windows  dcu
      rlink32  dll
      sysutils inc
      make     pif
      
  All  files must exist in the Fractal Explorer folder. FE will be check for
  the presence of these files before compiling the new formula. If you have 
  lost one or more files - download full archive from:

    http://www.eclectasy.com/Fractal-Explorer/download.htm

  and unzip it into FE's folder.


        4.4   Simple project
      Complex numbers are two-part numbers: the first part is thr real part, and
  thr second part is the imaginary part. The notation of complex numbers is:
                       Z = X + jY,
  where "j" - imaginary part sign (square root from "-1"). Fractal Explorer uses 
  this format for complex numbers.

      To illustrate a fractal formula take the Mandelbroth Set:
                       z_new = z * z  +  c

  You write in the edit box:
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
            var k: Extended;
          Begin
            k:=(x+y) * (x-y) + cr;
            y:=2 * x * y + ci;
            x:=k;
          End;
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
  "x" is the real part of "z" a complex number, and "y" the imaginary part.
  "cr" is the real part of "c" complex number, and "ci" the imaginary part.
  "z" is the value received in the "x" and "y" variables. New value of "z" 
  will be returned in these variables.


      The variable "k" is used to store the new "x" values before calculating
  new "y" values.

      Press the "Compile" button and FE will make a Delphi project for 
  this formula:
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
            
      library proba;
      Uses ShareMem, SysUtils, Math;
      Procedure Formula(  var x, y, cr, ci: Extended;
                        const p1r, p1i, p2r, p2i, p3r, p3i, p4r, p4i: Extended;
                          var cA1, cA2, cA3, cA4: TComplex;
                        const CPixel: TComplex;
                        const Fn1, Fn2: Integer); export;
        var k: Extended;
      Begin
        k:=(x+y) * (x-y) + cr;
        y:=2 * x * y + ci;
        x:=k;
      End;
      exports
      Formula index 1 name 'Formula';
      BEGIN
      END.
      
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~

  For Delphi and Pascal programmers these code are simple. Other peoples may be 
  interested only in Procedure Formula declaration:
  
  Procedure Formula(  var x, y, cr, ci: Extended;
                    const p1r, p1i, p2r, p2i, p3r, p3i, p4r, p4i: Extended;
                      var cA1, cA2, cA3, cA4: TComplex;
                    const CPixel: TComplex;
                    const Fn1, Fn2: Integer); export;
  
  Variables:
    x, y     - mathematical coordinates of current point on every cycle;
    cr,ci    - real and imaginary parts of Julia parameter (C);
    p1r..p4i - real and imaginary parts of fractal parameters P1, P2, P3 and P4;
    cA1..cA4 - zero-initialized variables available for use by you;
    CPixel   - constant value, which contains the complex coordinates
               of the current pixel;
    Fn1, Fn2 - codes of the first and second functions.


  You can modify values of cr and ci variales in your formulae. 
  There are lot of the good formulas used this feature. For example:
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
              
        var c1,c2: Extended;
      Begin
        c1:=x; c2:=y;
        k:=(x+y) * (x-y) + cr;
        y:=2 * x * y + ci;
        x:=k;
        cr:=c1; ci:=c2;
      End;
      
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~

      Values, received in p1r, p1i, .. , p4r, p4i parameters are real and 
  imaginary parts of the P1, P2, P3 and P4 parameters of the fractal (look to 
  the "Select formula" window). They are constant for your formula. You can't 
  modify values of these variables. But you can use cA1,..cA4 variables to 
  send the data from one iteration to another. This variabels available for
  modifing and they are initialized to zero before each pixel calculation.

  That's all, folks !
  
  NOTE: do not write calculation cycle; Fractal Explorer does it itself!!!
  


        4.5   Temporarly variable declaration

      Separate your formula into small parts and use temporary variables
  (remember, that it requires the "var" section). Sintax for a temporary 
  variable declaration:
     var name1, name2, name3: [type]
  Type may be "Single", "Double" or "Extended".

  Difference:
       type     | range                       | significant | size in
                |                             | digits      | bytes  
       ---------+-----------------------------+-------------+--------
       Single   | 1.5x10^_45 .. 3.4x10^38     | 7_8         | 4      
       Double   | 5.0x10^_324 .. 1.7x10^308   | 15_16       | 8      
       Extended | 3.6x10^_4951 .. 1.1x10^4932 | 19_20       | 10     

  "Single" works quickly, but precision is lowest;
  "Double" works much slowly, but precision is good;
  "Extended" works very slowly, but precision is very good.
  The "Double" type is used by default and we recommend it to you.
  
      The special type for the complex numbers is declared in the Formula
  Compiler: 
  
      TComplex = record
          real: Extended;
          imag: Extended;
       end;
  
  You can declare variables of this type in your formulae to store complex 
  numbers and use internal functions and procedures. By the way, variables
  cA1, cA2, cA3 and cA4 has TComplex type too.

  Examles:
      var tmp1,tmp2: Double;
    Begin
      <>formula...<>
    End;

      var h1x,h1y: Double;
          h2x,h2y: Double;
    Begin
      <>formula...<>
    End;

      var h1x,h1y: Double;
          h2x,h2y: Double;
          f: Extended;
          c1,c2: TComplex;
    Begin
      <>formula...<>
      c1:=c2;                   // -it is a totally right operation
      <>formula...<>
    End;



        4.6   Difficult project
  Mandel/Talis formula:
    
            z_new = z*z + c;
            c_new = c*c/(c+P1) + z_new;

  Write in the edit area:
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
              
        var h1x,h1y, h2x,h2y, f: Extended;  // -temporary variables
      Begin
        h1x:=(x+y)*(x-y)+cr;                // -calculating z_new
        y  := x*y*2     +ci;                //  z_new = z*z + c
        x  := h1x;

        h1x:= (cr+ci)*(cr-ci);              // -h1 = c*c
        h1y:=  cr*ci * 2;

        h2x:= cr+p1r;                       // -h2 = c+P1
        h2y:= ci+p1i;

        f  := h2x*h2x+h2y*h2y+1E-10;        // -c_new=h1/h2 + z_new
        cr :=(h2x*h1x+h2y*h1y)/f+x;
        ci :=(h2x*h1y-h2y*h1x)/f+y;
      End;
      
      ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
      Calculate new values for "x" (real part) and "y" (imaginary part) of
  complex variable "z".
  Also, change cr and ci values - real and imaginary parts of "c".
  Next step will use z_new and c_new.


        4.7   The complex functions

      You can use any function of the complex variables in your formula, but you
  must describe them, like this (remember, that Z = X + jY  and C = CR + jCI):
    z*z:       
       X_new := (X-Y)*(X+Y);
       Y_new := 2 * X*Y;

    z*c:       
       X_new := X*CR - Y*CI;
       Y_new := X*CI + Y*CR;

    z*z*z:       
       X_new := X*(X*X-3*Y*Y);                       // -this is optimized formula
       Y_new := Y*(3*X*X-Y*Y);
                                                     
    z*z*z*z:                             
       tmp_r := (X-Y)*(X+Y);                          
       tmp_i := 2 * X*Y;                             
       X_new := (tmp_r - tmp_i) * (tmp_r + tmp_i);   
       Y_new := 2 * tmp_r * tmp_i;           
                                                    
    1/z:                         
       tmp   := X*X + Y*Y + 1E-25;                   // -without 1E-25 may by
       X_new := X / tmp;                             //  divizion by zero
       Y_new :=-Y / tmp;                     

    1/(z*z):       
       tmp   := X*X + Y*Y;
       tmp   := tmp * tmp + 1E-25;                   // -see above
       X_new := (X*X - Y*Y) / tmp;
       Y_new := (2*X * Y  ) / tmp;

    Sqrt(z):       
       tmp   := Sqrt(X*X + Y*Y);
       X_new := Sqrt(Abs((X + tmp)/2));
       Y_new := Sqrt(Abs((tmp - X)/2));

    Exp(z):
       tmp   := Exp(X);                              // e^z
       X_new := tmp * Cos(Y);
       Y_new := tmp * Sin(Y);

    Exp(1/z):
       tmp   := X*X + Y*Y + 1E-25;                   // -see above
       s1    := X/tmp;
       s2    :=-Y/tmp;
       tmp   := Exp(s1);
       X_new := tmp * Cos(s2);
       Y_new := tmp * Sin(s2);

    Ln(z):       
       X_new :=Log2(X*X+Y*Y)/2.7182818285;
       Y_new :=ArcTan2(Y,X);

    z^c:       
       h1x   :=Log2(X*X+Y*Y)/2.7182818285;           // -Ln(z)
       h1y   :=ArcTan2(Y,X);
       h2x   :=h1x*CR - h1y*CI;                      // -Ln(z)*c
       h2y   :=h1y*CR + h1x*CI;
       f     :=Exp(h2x);                             // -Exp(Ln(z)*c)
       X_new :=f*Cos(h2y);
       Y_new :=f*Sin(h2y);

    Sin(z):       
       tmp   := Exp(Y)/2;                            // -optimized formula (!)
       tmp2  := 0.25/tmp;
       X_new := Sin(X) * (tmp+tmp2);
       Y_new := Cos(X) * (tmp-tmp2);

    Cos(z):       
       X_new := Cos(X)*Cosh(Y);                      // -not optimized formula
       Y_new :=-Sin(X)*Sinh(Y);

    Tan(z):       
       X_new := Sin(2*X)/(Cos(2*X)+Cosh(2*Y));
       Y_new := Sin(2*Y)/(Cos(2*X)+Cosh(2*Y));

    Sinh(z):                      // -hiperbolic sinus
       X_new := Sinh(X)*Cos(Y);                      // -it is not optimized formula
       Y_new := Cosh(X)*Sin(Y);

    Cosh(z):                      // -hiperbolic cosinus
       X_new := Cosh(X)*Cos(Y);                      // -it is not optimized formula
       Y_new := Sinh(X)*Sin(Y);

  You must change X, Y, CR and CI variables to those, which required by you 
  formula.





      
 
              Functions of complex variables: 



        5.1   List of the functions and procedures

      The special type for storing of the complex numbers was described above.
  You need to remember this declaration:
     
       Type
         TComplex = record
           real: Extended;
           imag: Extended;
         end;
     
      All of the functions listed below will use this type for their operations. 
  It's a very important part of the new version Formula Compiler. 

  List of the functions and procedures

     I. Function  MakeComplex(real, imag: Extended): TComplex;
                  This function makes a TComplex value from the two values,
                  which describe the real and imaginary parts of the
                  complex value. Use this function for translate the input values
                  (x,y, cr,ci and p1r..p4i) to the complex type. After 
                  translation you can use result in another functions
                  and procedures.
                  Also, you can use this function to make a TComplex value
                  from a constant, for example:
                     
                     tmp:=MakeComplex(3,0) - convert the real number "3" into 
                                             TComplex type.
                     
    II. Procedure SetResult(var x,y: Extended; const complex: TComplex);
                  This procedure makes final results accessible for the 
                  Formula Compiler. As described in the part [4.4], the result 
                  values must be returned in the "X" and "Y" variables.
                  You can use two operations for it:
                      x:=Z.real;
                      y:=Z.imag;
                  but now you can use the SetResult procedure for this.
                  
                  Note: remember, what the SetResult procedure works
                        little bit slowly then direct storing the data.
   
       Below are listed functions and procedures for mathematical operations.
   Every operation has two releases: first, as a procedure with no result
   returned, and second, as a function, which returns the result of the
   operation as a TComplex value.  Any procedure keeps the resulting complex
   value in the variable which passed as the first parameter.


   III. Sum of the two complex:
        Procedure CAddV(var Cmp1: TComplex; const Cmp2: TComplex);
                  Cmp1 := Cmp1 + Cmp2;
                  Result value will be returned in the "Cmp1" variable.
 
        Function  CAdd (const Cmp1, Cmp2: TComplex): TComplex;
                  Cmp3 := Cmp1 + Cmp2;
                  Result value will be returned as a result of the function.

        Function  CAddR (const Cmp1: TComplex; t: Extended): TComplex;
                  Cmp2 := Cmp1 + t
                  Added real value "t" to the "Cmp1" complex.

    IV. Subtraction of the two complex:
        Procedure CSubV(var Cmp1: TComplex; const Cmp2: TComplex);
                  Cmp1 := Cmp1 - Cmp2;

        Function  CSub (const Cmp1, Cmp2: TComplex): TComplex;
                  Cmp3 := Cmp1 - Cmp2;

        Function  CSubR (const Cmp1: TComplex; t: Extended): TComplex;
                  Cmp2 := Cmp1 - t;

     V. Multiplication of the two complex:
        Procedure CMulV(var Cmp1: TComplex; const Cmp2: TComplex);
                  Cmp1 := Cmp1 * Cmp2;

        Function  CMul (const Cmp1, Cmp2: TComplex): TComplex;
                  Cmp3 := Cmp1 * Cmp2;

        Function  CMulR (const Cmp1: TComplex; t: Extended): TComplex;
                  Cmp2 := Cmp1 * t;  
                         (Cmp2.real = Cmp1.real*t
                          Cmp2.imag = Cmp1.real*t)

    VI. Division of the two complex:
        Procedure CDivV(var Cmp1: TComplex; const Cmp2: TComplex);
                  Cmp1 := Cmp1 / Cmp2;

        Function  CDiv (const Cmp1, Cmp2: TComplex): TComplex;
                  Cmp3 := Cmp1 / Cmp2;

        Function  CDivR (const Cmp1: TComplex; t: Extended): TComplex;
                  Cmp2 := Cmp1 / t;
                         (Cmp2.real = Cmp1.real/t
                          Cmp2.imag = Cmp1.real/t)

   The next set of functions realizes the optimized functions

   VII. Square of the complex:
        Procedure CSqrV(var Cmp1: TComplex);
                  Cmp1 := Cmp1^2;

        Function  CSqr (Cmp1: TComplex): TComplex;
                  Cmp2 := Cmp1^2;

  VIII. Third power of the complex:
        Procedure CTripleV(var Cmp1: TComplex);
                  Cmp1 := Cmp1^3;

        Function  CTriple (Cmp1: TComplex): TComplex;
                  Cmp2 := Cmp1^3;

    IX. Fourth power of the complex:
        Procedure CFourV(var Cmp1: TComplex);
                  Cmp1 := Cmp1^4;

        Function  CFour (Cmp1: TComplex): TComplex;
                  Cmp2 := Cmp1^4;

     X. Flip of the complex:
        Procedure CFlipV(var Cmp1: TComplex);
                  Cmp1.real := Cmp1.imag;
                  Cmp1.imag := Cmp1.real;

        Function  CFlip (Cmp1: TComplex): TComplex;
                  Cmp2.real := Cmp1.imag;
                  Cmp2.imag := Cmp1.real;

    XI. Reversing of the complex value:
        Procedure CRevV (var Cmp1: TComplex);
                  Cmp1 := 1/ Cmp1;

        Function  CRev  (const Cmp1: TComplex): TComplex;
                  Cmp2 := 1/ Cmp1;

   XII. Another reversing:
        Procedure CRev2V(var Cmp1: TComplex; Cmp2: TComplex);
                  Cmp1 := 1 / (Cmp1 - Cmp2);

        Function  CRev2 (Cmp1,Cmp2: TComplex): TComplex;
                  Cmp3 := 1 / (Cmp1 - Cmp2);

  XIII. Absolute value of complex:
        Procedure CAbsV(var Cmp1: TComplex);
                  Cmp1.real := Abs(Cmp1.real);
                  Cmp1.imag := Cmp1.imag;
        Function  CAbs (Cmp1: TComplex): TComplex;
                  Cmp2.real := Abs(Cmp1.real);
                  Cmp2.imag := Cmp1.Imag;
       
        Procedure CAbs2V(var Cmp1: TComplex);
                  Cmp1.real := Abs(Cmp1.real);
                  Cmp1.imag := Abs(Cmp1.imag);
        Function  CAbs2 (Cmp1: TComplex): TComplex;
                  Cmp2.real := Abs(Cmp1.real);
                  Cmp2.imag := Abs(Cmp1.Imag);

   XIV. Real or imag part of complex:
        Procedure CRealV(var Cmp1: TComplex);
                  Cmp1.real := Cmp1.real;
                  Cmp1.imag := 0; 
        Function  CReal (Cmp1: TComplex): TComplex;
                  Cmp2.real := Cmp1.real;
                  Cmp2.imag := 0;  

        Procedure CImagV(var Cmp1: TComplex);
                  Cmp1.real := Cmp1.imag;
                  Cmp1.imag := 0; 
        Function  CImag (Cmp1: TComplex): TComplex;
                  Cmp2.real := Cmp1.imag;
                  Cmp2.imag := 0;  

    XV. Squre root of the complex:
        Procedure CSqrtV(var Cmp1: TComplex);
                  Cmp1 := Sqrt(Cmp1);

        Function  CSqrt (Cmp1: TComplex): TComplex;
                  Cmp2 := Sqrt(Cmp1);

   XVI. Exponent of the complex:
        Procedure CExpV (var Cmp1: TComplex);
                  Cmp1 := Exp(Cmp1);

        Function  CExp  (Cmp1: TComplex): TComplex;
                  Cmp2 := Exp(Cmp1);

  XVII. Logorithm of the complex:
        Procedure CLnV  (var Cmp1: TComplex);
                  Cmp1 := Ln(Cmp1);

        Function  CLn   (Cmp1: TComplex): TComplex;
                  Cmp2 := Ln(Cmp1);

 XVIII. Raise complex to a real power
        Procedure CPowerRV(var Cmp1: TComplex; t: Extended);
                  Cmp1 := Cmp1^t;

        Function  CPowerR (const Cmp1:TComplex;t: Extended): TComplex;
                  Cmp2 := Cmp1^t;

   XIX. Raise complex value to a complex power:
        Procedure CPowerV(var Cmp1: TComplex; Cmp2: TComplex);
                  Cmp1 := Cmp1^Cmp2;

        Function  CPower (Cmp1,Cmp2: TComplex): TComplex;
                  Cmp3 := Cmp1^Cmp2;


   Trigonometric functions

    XX. Sinus of the complex:
        Procedure CSinV (var Cmp1: TComplex);
                  Cmp1 := Sin(Cmp1);

        Function  CSin  (Cmp1: TComplex): TComplex;
                  Cmp2 := Sin(Cmp1);

   XXI. Cosinus of the complex:
        Procedure CCosV (var Cmp1: TComplex);
                  Cmp1 := Cos(Cmp1);

        Function  CCos  (Cmp1: TComplex): TComplex;
                  Cmp2 := Cos(Cmp1);

  XXII. Tangent of the complex:
        Procedure CTanV (var Cmp1: TComplex);
                  Cmp1 := Tan(Cmp1);

        Function  CTan  (Cmp1: TComplex): TComplex;
                  Cmp2 := Tan(Cmp1);

 XXIII. Cotangent of the complex:
        Procedure CCotanV (var Cmp1: TComplex);
                  Cmp1 := Cotan(Cmp1);

        Function  CCotan  (Cmp1: TComplex): TComplex;
                  Cmp2 := Cotan(Cmp1);

  XXIV. Hiperbolic sinus of the complex:
        Procedure CSinhV(var Cmp1: TComplex);
                  Cmp1 := Sinh(Cmp1);

        Function  CSinh (Cmp1: TComplex): TComplex;
                  Cmp2 := Sinh(Cmp1);

   XXV. Hiperbolic cosinus of the complex:
        Procedure CConhV(var Cmp1: TComplex);
                  Cmp1 := Cosh(Cmp1);

        Function  CCosh (Cmp1: TComplex): TComplex;
                  Cmp2 := Cosh(Cmp1);

  XXVI. ArcSinus of the complex:
        Procedure CASinV (var Cmp1: TComplex);
                  Cmp1 := ArcSin(Cmp1);

        Function  CASin  (const Cmp1: TComplex): TComplex;
                  Cmp2 := ArcSin(Cmp1);

 XXVII. ArcCosinus of the complex:
        Procedure CACosV (var Cmp1: TComplex);
                  Cmp1 := ArcCos(Cmp1);

        Function  CACos  (const Cmp1: TComplex): TComplex;
                  Cmp2 := ArcCos(Cmp1);

XXVIII. ArcTangens of the complex:
        Procedure CATanV (var Cmp1: TComplex);
                  Cmp1 := ArcTan(Cmp1);

        Function  CATan  (const Cmp1: TComplex): TComplex;
                  Cmp2 := ArcTan(Cmp1);

  XXIX. Gyperbolic arcsinus of the complex:
        Procedure CASinhV (var Cmp1: TComplex);
                  Cmp1 := ArcSinh(Cmp1);

        Function  CASinh  (const Cmp1: TComplex): TComplex;
                  Cmp2 := ArcSinh(Cmp1);

   XXX. Hyperbolic arccosinus of the complex:
        Procedure CACoshV (var Cmp1: TComplex);
                  Cmp1 := ArcCosh(Cmp1);

        Function  CACosh  (const Cmp1: TComplex): TComplex;
                  Cmp2 := ArcCosh(Cmp1);

  XXXI. Hyperbolic arctangent of the complex:
        Procedure CATanhV (var Cmp1: TComplex);
                  Cmp1 := ArcTanh(Cmp1);

        Function  CATanh  (const Cmp1: TComplex): TComplex;
                  Cmp2 := ArcTanh(Cmp1);

   Additional functions
XXXII.  Changes sign of imaginary part of the complex value
                  Result.real := Cmp1.real;
                  Result.imag :=-Cmp1.imag;
        Procedure CConjV (var Cmp1: TComplex);
        Function  CConj  (const Cmp1: TComplex): TComplex;



        5.2   Functions selector

      From the "Select fractal" window two functions can be changed.
  Such changes will not require compilation of the formula. You can use 
  in your formula one or two functions and change the fractal directly from 
  the "Select fractal" dialogue.

  To support external functions selections the procedure FuncDisp is implemented:
     Procedure FuncDisp(const Fn: Integer; var Cmp1: TComplex);

  In this procedure - Fn parameter is Fn1 or Fn2 variables, 
  which is passed to formulae from the outside. For example, write in your
  formula:
     FuncDisp(Fn1, Z);
  and you can change the first function to get changes in the formula.

  Examples of the Mandelbrot-set with functions selections:
  
       var Z,Z0: TComplex;
     Begin
       Z :=MakeComplex(x,y);          // make complex from [x] and [y] variables
       Z0:=MakeComplex(cr,ci);        // make complex from [cr] and [ci] variables

       FuncDisp(Fn1, Z);              // change source value of the Z variable
       Z :=CAdd( CSqr(Z), Z0);        // calculate the Mandel

       SetResult(x,y, Z);             // store result to [x] and [y] variables
     End;
  



        5.3   Changes in the recent versions

      Changes in versions 2.01 and 2.02
  [+] added function selection support (look at [5.2] for details and example);
  [+] errors in some functions fixed;
  [+] added new procedures and functions:
          Procedure CAddR(Cmp1: TComplex; t: Extended): TComplex;
          Function  CSubR(Cmp1: TComplex; t: Extended): TComplex;
          Procedure CMulR(Cmp1: TComplex; t: Extended): TComplex;
          Function  CDivR(Cmp1: TComplex; t: Extended): TComplex;

          Procedure CPowerRV(var Cmp1: TComplex; t: Extended);
          Function  CPowerR (Cmp1: TComplex; t: Extended): TComplex;

          Procedure CCotanV(  var Cmp1: TComplex);
          Function  CCotan (const Cmp1: TComplex): TComplex;

          Procedure CASinV (  var Cmp1: TComplex);
          Function  CASin  (const Cmp1: TComplex): TComplex;
          Procedure CACosV (  var Cmp1: TComplex);
          Function  CACos  (const Cmp1: TComplex): TComplex;
          Procedure CATanV (  var Cmp1: TComplex);
          Function  CATan  (const Cmp1: TComplex): TComplex;

          Procedure CASinhV(  var Cmp1: TComplex);
          Function  CASinh (const Cmp1: TComplex): TComplex;
          Procedure CACoshV(  var Cmp1: TComplex);
          Function  CACosh (const Cmp1: TComplex): TComplex;
          Procedure CATanhV(  var Cmp1: TComplex);
          Function  CATanh (const Cmp1: TComplex): TComplex; 

  [+] added four complex variables for using in your formulae.
      new declaration of the main procedure listed below:
          
          Procedure Formula(var x, y, cr, ci: Extended;
                            const p1r, p1i, p2r, p2i, p3r, p3i: Extended;
                              var cA1, cA2, cA3, cA4: TComplex;
                            const Fn1, Fn2: Integer); export; 
      This variables are initialised to zero values, i.e. cA1.real = 0 and 
      cA1.imag = 0 and so on. During calculation of the one point these 
      variables will keep user values.

  [!] now N(ewton)-Set Method will work properly;

 
      Changes in version 2.03

  [++] added FEParser by Kyle McCord to help you to write the formulas simple;    
  [+] speed improvements;
  [+] little bug fixes;
  [+] added the new CPixel constant and P4 parameter:
          
          Procedure Formula(var x, y, cr, ci: Extended;
                            const p1r, p1i, p2r, p2i, p3r, p3i, p4r, p4i: Extended;
                              var cA1, cA2, cA3, cA4: TComplex;
                            const CPixel: TComplex;
                            const Fn1, Fn2: Integer); export; 

  [+] added new procedure and function:
          
          Procedure CConjV(Cmp1: TComplex);
          Function  CConj(Cmp1: TComplex): TComplex; 
      



        5.4   Examples of the new formulae

  I. Mandelbrot furmula:
     ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
     
       var Z,Z0: TComplex;
     Begin
       Z :=MakeComplex(x,y);          // make complex from [x] and [y] variables
       Z0:=MakeComplex(cr,ci);        // make complex from [cr] and [ci] variables

       Z :=CAdd( CSqr(Z), Z0);        // calculate the Mandel

       SetResult(x,y, Z);             // store result to [x] and [y] variables
     End;
     
     ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~

 II. Mandel/Talis formula:
       z_new = z*z + c;
       c_new = c*c/(c+P1) + z_new;

     Write:
     ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~
     
       var Z,Z0,P1: TComplex;
     Begin
       Z :=MakeComplex(x,y);          // make complex from [x] and [y] variables
       Z0:=MakeComplex(cr,ci);        // make complex from [cr] and [ci] variables
       P1:=MakeComplex(p1r,p1i);      // make complex from [p1r] and [p1i] variables

       Z :=CAdd( CSqr(Z), Z0);        // calculates Z_NEW

       Z0:=CDiv(CSqr(Z0), CAdd(Z0,P1))   // Z' = C*C/(C+P1)
       Z0:=CAdd(Z0,Z);                   // C_NEW  = Z'+Z_NEW
       SetResult(cr,ci, Z0);          // store C_NEW to [cr] and [ci] variables
       SetResult(x,y, Z);             // store Z_NEW to [x] and [y] variables
     End;
     
     ~~~~~~~~~~~~Cut~~~~~~Cut~~~~~~~~~~~~

  Others, more difficult examples can be found in the FE.ZIP archive.
  They're placed into the "Formulas" subfolder.

Copyright © 1999-2002
Sirotinsky Arthur, Olga Fedorenko, Denis McCauley
Ukraine, France.